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Evidence-led knowledge base

Sources and standards

Official codes, standards, government technical sources and selected primary research underpinning Pergola Wiki.

Source hierarchy

Tier 1: official regulatory and code material; Tier 2: consensus standards; Tier 3: government, research-institute or expert implementation material and peer-reviewed primary research; Tier 4: official technical directories. A tier describes source type—it does not make a document automatically applicable to every project.

Source-register baseline: 25 July 2026; targeted rechecks: 30 July and 2026-10-17 — This is not a same-day full re-review of the content, current edition and local adoption status of all 154 sources.

Targeted edition check: 30 July 2026 — official standards and product-evidence entry points for the United States, European Union, all four UK nations, Australia, Canada and New Zealand were checked; this is not a full content re-review of all 55 registered sources. Review standards navigation · Review product evidence and project dossier。

Conformity-entry check: 29 July 2026 — six ISO, ILAC and European Commission entry points for testing, inspection, product certification, supplier declarations and notified bodies were checked as targeted methodology references. They are not counted among the 55 topic-evidence sources and do not validate a specific report or certificate. Open the report and certificate verification guide。

Download source data and topic-citation relationships →

154 sources

Source tier 1

UK Ministry of Housing, Communities and Local Government — Permitted development rights for householders — technical guidance (opens in a new tab)

England-only technical guidance distinguishing ground level from added decking and defining a raised platform as more than 0.3 metres; verandahs, balconies and raised platforms are excluded from the cited householder permitted-development classes. It does not decide whether a pergola or terrace project is lawful, remove building-regulations or other-consent checks, or apply elsewhere in the UK.

Official guidance updated 2019-09-10; checked 2026-09-01 · ID: govuk-householder-permitted-development
Source tier 1

Health and Safety Executive (Great Britain) — Work at height: the law (opens in a new tab)

Great Britain regulator guidance on the Work at Height Regulations 2005: the Regulations exist to prevent death and injury caused by a fall from height; they apply to employers and to those who control work at height, including building owners who contract others to work at height; work at height must be properly planned, supervised and carried out by competent people using the right equipment, with the risks assessed first. It is a Great Britain occupational-safety duty and does not approve a structure, license a trade, replace a project-specific method statement or apply outside Great Britain.

Guidance page updated 2024-10-29; checked 2026-10-12 · ID: hse-work-at-height
Source tier 2

Lysaght — Gazebo Construction Guide — 6-sided layout (opens in a new tab)

Manufacturer instructions for one six-sided steel gazebo kit, including perimeter beams, radial rafters, a crown connector, angled gutters, an outlet and product-specific setting-out and footing details. It demonstrates a complete six-sided roof-system topology only for that documented kit; its dimensions, connectors, footings and approval notes are not a universal hexagonal-pergola design.

Manufacturer installation guide; checked 2026-09-14 · ID: lysaght-six-sided-gazebo-guide
Source tier 3

DGCCRF — Ministère de l'Économie — Conseils pour réussir la rénovation énergétique de son logement (opens in a new tab)

Official French consumer guidance recommending comparison of multiple quotations, requiring specified pre-contract price, technical and timing information, and warning that cost and aid figures may be stale or inapplicable. It is limited to its French energy-renovation context and does not establish photovoltaic-pergola eligibility or a universal contract rule.

Living French consumer guidance; checked 2026-09-10 · ID: france-dgccrf-energy-renovation
Source tier 3

US Department of Energy — Industrial Efficiency and Decarbonization Office — Solar Photovoltaic System Cost Benchmarks (opens in a new tab)

US federal benchmark methodology for representative photovoltaic systems, component-level intrinsic units, minimum sustainable price, modeled market price and operation and maintenance. Its US system sizes and dollar values are not a French or photovoltaic-pergola retail estimate.

2025 Q1 benchmark; checked 2026-09-10 · ID: doe-pv-cost-benchmarks
Source tier 1

Service-Public.fr — Direction de l'information légale et administrative — Faut-il une autorisation d'urbanisme pour poser des ombrières photovoltaïques ou des panneaux solaires au sol ? (opens in a new tab)

Official French planning guidance defining a photovoltaic canopy as a dual-purpose shade-and-electricity structure and describing authorization routes by power, height and protected-area status. It does not classify every residential pergola or transfer French thresholds elsewhere.

Official French service guidance; verified 2025-01-17; checked 2026-09-09 · ID: france-pv-canopy-planning
Source tier 1

Italia Semplice — Dipartimento della funzione pubblica — Impianti fotovoltaici (opens in a new tab)

Official Italian overview of simplified administrative regimes for specified photovoltaic interventions, including some installations on existing buildings or their appurtenances. It is not a project classification, a universal building-title exemption or proof that a photovoltaic pergola qualifies.

Living Italian government simplification guidance; checked 2026-09-09 · ID: italy-pv-simplification
Source tier 1

Normattiva — Presidenza del Consiglio dei Ministri — Decreto legislativo 25 novembre 2024, n. 190 (opens in a new tab)

Italian legislation governing administrative regimes for renewable-energy installations while expressly preserving urban-planning and technical building rules for the construction and connected works that need a building title. Regional, local, landscape and project facts remain material.

In force from 2024-12-30; official record last updated 2026-04-18; checked 2026-09-09 · ID: italy-renewable-administrative-regimes
Source tier 3

US Department of Energy — Federal Energy Management Program — Life Cycle of Photovoltaic Systems: Install and Commission a Photovoltaic System (opens in a new tab)

US federal facility guidance covering PV electrical equipment, cable management, modules, racking, fasteners, weather exposure, drainage, commissioning and decommissioning. It is a technical checklist, not a universal code, product approval or project design.

Living US federal technical guidance; checked 2026-09-09 · ID: doe-pv-install-commission
Source tier 1

National Research Council Canada — Provincial or territorial ministries responsible for construction codes (opens in a new tab)

Official directory explaining that provinces and territories have jurisdiction over construction and listing the authorities responsible for adoption, enforcement and interpretation. The directory is a verification route, not evidence that NBC 2025 has been adopted at a specific address.

Living official authority directory; checked 2026-07-30 · ID: canada-code-authorities
Source tier 3

Swedish Wood (Swedish Forest Industries Federation) — Moisture content — Wood facts (opens in a new tab)

Swedish wood-industry technical reference explaining that wood is hygroscopic and that its moisture content continuously adapts to the surrounding relative humidity and temperature. It defines moisture content and equilibrium moisture content, and links moisture state to dimensions, strength and resistance to degradation, including shrinkage, swelling and condensation in service. It is Nordic industry guidance: it does not establish a durability class, a preservative treatment specification, a design value, a product rating or a project requirement.

Living industry technical reference; checked 2026-09-23 · ID: swedishwood-moisture
Source tier 2

US Environmental Protection Agency (Indoor Environments Division) — Moisture Control Guidance for Building Design, Construction and Maintenance (EPA 402-F-13053) (opens in a new tab)

US federal guidance setting out three design principles for moisture control: control liquid water; manage condensation and the movement of water vapour; and control indoor humidity and moisture from materials and equipment. It explains that liquid water leaks through holes, wicks through porous materials and runs along or beneath assembly surfaces, and it treats site drainage, gutter systems, above- and below-grade drainage planes, flashing, condensate drainage and humidity control as separate elements whose joints and penetrations must stay continuous. The document states that it is not a textbook, code or standard. It is general building moisture-control guidance for the United States: it is not a product test, a watertight rating, a rain-penetration test method, a covering approval or a project requirement.

December 2013; checked 2026-09-28 · ID: epa-moisture-control
Source tier 2

US Environmental Protection Agency — Chromated Arsenicals (CCA) (opens in a new tab)

Official US EPA page on chromated arsenicals, a group of wood-preservative pesticides containing chromium, copper and/or arsenic. It records that these preservatives protect wood against termites, fungi and other pests, that manufacturers voluntarily discontinued chromated-arsenical-treated wood products for homeowner uses in December 2003, that EPA does not require removal of existing structures or surrounding soil, and that a penetrating protective coating such as an oil- or water-based stain may reduce leaching from older treated wood. It is a US consumer and pesticide-registration boundary only: it does not give a wood durability class, use category, retention specification, structural capacity, handling rule for another jurisdiction or project approval.

Living official page; checked 2026-09-23 · ID: epa-chromated-arsenicals
Source tier 1

UK Ministry of Housing, Communities and Local Government — Planning Practice Guidance — Enforcement and post-permission matters (Planning Practice Guidance) (opens in a new tab)

England planning-practice guidance on enforcement. It sets out the section 171B Town and Country Planning Act 1990 time limits as amended, including the transitional arrangements for operational development substantially completed before 25 April 2024; the proportionate options a local planning authority may consider (no formal action, retrospective application, enforcement warning notice, planning contravention notice, enforcement notice, planning enforcement order, stop notice, temporary stop notice, breach of condition notice, injunction, and others); the statement that a person who has undertaken unauthorised development has only one opportunity to obtain permission after the event, through a section 73A application or a ground (a) appeal; and the limits on that choice in sections 70C and 174. It is departmental practice guidance for England, not legislation, not a decision about any project and not a rule for Wales, Scotland or Northern Ireland.

Living official guidance; cited paragraphs revised 22 02 2018 and 25 04 2024; checked 2026-09-23 · ID: govuk-enforcement-and-post-permission-matters
Source tier 1

The National Archives — legislation.gov.uk — Town and Country Planning Act 1990, section 171B — Time limits (opens in a new tab)

Revised statutory text of section 171B. For a breach consisting of building, engineering, mining or other operations, no enforcement action may be taken after ten years from substantial completion in England and after four years in Wales; the same England and Wales split applies to an unauthorised change of use of a building to use as a single dwellinghouse; any other breach of planning control is subject to ten years; and further enforcement action remains possible within four years of earlier action or purported action on the same breach. It states time limits only: it does not decide whether a structure needed permission, whether it is lawful, or what steps an authority will require.

Statute as amended; the England ten-year limits were substituted and commenced 25 April 2024; checked 2026-09-23 · ID: legislation-tcpa-1990-section-171b
Source tier 1

UK Government (GOV.UK) — Appeal against an enforcement notice (opens in a new tab)

Official England guide to enforcement-notice appeals: who may appeal (a person who owns, rents or lawfully occupies the property or land), the rule that the appeal must be received before the date the notice takes effect, submission to the Planning Inspectorate with a copy of the appeal and supporting documents to the local planning authority, the document and file-type requirements, the absence of an appeal fee unless planning permission is also sought, the ability of anyone to comment on an appeal, awards of costs, and the High Court route where a legal mistake is alleged. It describes the appeal process only and does not assess any project, notice or ground of appeal.

Living official guide; checked 2026-09-23 · ID: govuk-appeal-against-an-enforcement-notice
Source tier 2

European Commission Joint Research Centre — The road to the second generation Eurocodes: where are we? (opens in a new tab)

Official European Commission programme page for the second generation of the EN Eurocodes. It states that the family will include 11 European Standards and 2 Technical Specifications, in total 74 parts; that CEN makes each part available to the National Standards Bodies after the closure of all Enquiries and Formal Votes, with the latest Date of Availability (DAV) no later than 30 March 2026; and that the Date of Publication is the latest date by which each EN has to be implemented at national level by publishing an identical national standard or by endorsement. It describes the programme timetable and its terminology only: it does not state which edition applies to a project, whether a National Annex exists or what it contains, or any design value, capacity, product performance or approval outcome.

Living JRC programme-status page; checked 2026-09-24 · ID: jrc-eurocodes-2nd-generation-road
Source tier 2

European Commission Joint Research Centre — Second generation of the Eurocodes: what is new? (opens in a new tab)

Official European Commission page summarising the second-generation changes prepared by CEN/TC 250 subcommittees: further harmonisation and improved ease of use for day-to-day calculation; requirements for the assessment, re-use and retrofitting of existing structures; strengthened robustness requirements; a new Eurocode on structural glass; and pre-normative work on fibre-polymer composite (FRP) and tensioned membrane structures with related CEN Technical Specifications. It summarises programme-level changes: it does not establish an applicable edition, a National Annex, a design value, a product rating or a project approval.

Living JRC page; 2025 workshop material; checked 2026-09-24 · ID: jrc-eurocodes-2nd-generation-what-new
Source tier 2

International Plant Protection Convention (IPPC), FAO — ISPM 15 — Regulation of wood packaging material in international trade (opens in a new tab)

Official IPPC publication page for ISPM 15. Its description states that the standard describes phytosanitary measures that reduce the risk of introduction and spread of quarantine pests associated with the movement in international trade of wood packaging material made from raw wood; that the material covered includes dunnage while wood packaging made from wood processed so that it is free from pests, such as plywood, is excluded; and that the measures described are not intended to provide ongoing protection from contaminating pests or other organisms. It is a plant-health measure for wood packaging material only: it assigns no strength grade, durability class, preservative retention, moisture content, structural capacity or construction suitability to the wood, and it is not a building code.

Adopted international standard; IPPC publication page checked 2026-09-24 · ID: ippc-ispm15
Source tier 1

UK Government (GOV.UK) — Forestry Commission — Wood packaging material for import and export (opens in a new tab)

Official Great Britain guidance on wood packaging material. It states that wood packaging material is known to introduce harmful tree and forestry pests and diseases, that importers, exporters and suppliers must follow the rules meeting ISPM 15 applied from 1 January 2021 when moving wood packaging material between Great Britain and other countries including EU member states and Switzerland, and that the material includes packing cases, boxes, crates, drums and similar containers, pallets, box pallets, pallet collars and other load boards, and dunnage. It records exclusions such as processed non-solid material like plywood, raw wood 6 mm thick or less, barrels for wines and spirits and gift boxes made from processed wood, and states that producing ISPM15-compliant packaging requires membership of the UK Wood Packaging Material Marking Programme with six-monthly facility assessments. It is a plant-health movement rule for packaging: it does not grade wood for construction, set a durability class, certify structural performance or approve a use.

Published 26 September 2018; last updated 22 April 2026; checked 2026-09-24 · ID: govuk-wood-packaging-material
Source tier 1

European Commission — Directorate-General for Health and Food Safety — Requirements for wood packaging & dunnage (opens in a new tab)

Official European Commission page on EU requirements for wood packaging material and dunnage. It states that the requirements are based on the 2002 FAO International Standard for Phytosanitary Measures (ISPM) No. 15, that Regulation (EU) 2016/2031 on protective measures against plant pests (the Plant Health Law) sets the requirements for non-EU imports, and that all wood packaging material and dunnage from non-EU countries must be heat treated or fumigated in line with ISPM 15 procedures, officially marked with the ISPM 15 stamp consisting of three codes — country, producer and measure applied — together with the IPPC logo, and debarked. It lists exceptions for wood 6 mm thick or less, wood packaging material made entirely from processed wood produced using glue, heat and pressure such as plywood, oriented strand board and veneer, and wood packaging material used in trade within the EU. It is a plant-health import requirement: it assigns no grade, durability class or structural capacity and approves no construction use.

Living Commission page; checked 2026-09-24 · ID: eu-wood-packaging-dunnage
Source tier 2

ASTM International — ASTM A123/A123M-24 — Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products (opens in a new tab)

Public abstract and scope of the current ASTM specification for hot-dip galvanized zinc coatings. Its scope covers zinc coating by the hot-dip process on iron and steel products made from rolled, pressed and forged shapes, castings, plates, bars and strips, and it covers both unfabricated products and fabricated products such as assembled steel products, structural steel fabrications and large tubes already bent or welded before galvanizing. It states that it does not apply to wire, pipe, tube or steel sheet galvanized on specialized or continuous lines, or to steel less than 22 gage (0.0299 in. [0.76 mm]) thick, and that the galvanizing of hardware items to be centrifuged or otherwise handled to remove excess zinc — such as bolts and similar threaded fasteners, castings and rolled, pressed and forged items — shall be in accordance with Specification A153/A153M. It sets coating requirements for the products in its scope: it does not assign a steel grade, a structural capacity, a service life, an atmosphere corrosivity category or a project approval, and it states that its inch-pound and SI unit systems are not exact equivalents.

2024 edition, last updated 17 July 2024; public abstract read 2026-09-25 · ID: astm-a123
Source tier 2

ASTM International — ASTM A153/A153M-23 — Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware (opens in a new tab)

Public abstract of the current ASTM specification for hot-dip zinc coatings on iron and steel hardware. It states that the specification covers zinc coatings applied by the hot-dip process on iron and steel hardware, that the process forms layers of zinc/iron alloy adhering to the steel surface, that it applies to hardware items of Classes A, B, C and D, that the thickness or weight/mass of the zinc coating shall conform to specified values for the various classes of materials, and that coated articles shall be free from uncoated areas, blisters, flux deposits, dross inclusions and other defects, the coating being smooth and reasonably uniform in thickness. It also describes tests for minimum coating weight or thickness, finish and appearance, and embrittlement. It is a coating specification for hardware items: it does not set the substrate's grade, the connection design, the site exposure, a service life or a project approval.

2023 edition, last updated 16 May 2023; public abstract read 2026-09-25 · ID: astm-a153
Source tier 2

European Commission Joint Research Centre — Eurocode 3 — Design of steel structures (opens in a new tab)

Official Joint Research Centre directory page for the European steel-design Eurocode. It states that EN 1993 applies to the design of buildings and other civil engineering works in steel, that it complies with the principles and requirements for the safety and serviceability of structures, their basis of design and verification, given in EN 1990 — Basis of structural design, and that EN 1993 is concerned with requirements for resistance, serviceability, durability and fire resistance of steel structures. It states that EN 1993 is wider in scope than most other design Eurocodes and has about 20 parts covering common rules, fire design, bridges, buildings, tanks, silos, pipelines, piling, crane-supported structures, towers and masts and chimneys, and it lists the parts, including EN 1993-1-1:2005 (general rules and rules for buildings), EN 1993-1-2:2005 (general rules — structural fire design) and EN 1993-1-4:2006 (supplementary rules for stainless steels). It also states that EN 1993 is intended to be used in conjunction with EN 1990, EN 1991, product ENs, ETAGs and ETAs for steel structures, EN 1090 (execution of steel structures — technical requirements) and the other design Eurocodes. It is a European framework directory: it does not establish national adoption or a National Annex, a design value, a member capacity, a fire rating or a project approval, and it does not determine which edition applies to a project.

Eurocodes programme directory page; read 2026-09-25 · ID: jrc-eurocode-3
Source tier 3

Galvanizers Association (UK and Ireland) — Design detailing — guidance for articles to be hot dip galvanized (opens in a new tab)

Technical guidance page from the Galvanizers Association, the hot-dip galvanizing industry association for the United Kingdom and Ireland. It explains that articles to be galvanized are immersed into and withdrawn from a bath of molten zinc heated to about 450 °C, that design and fabrication must therefore allow access and drainage of molten zinc, that holes present for other purposes may fulfil the venting and draining requirement where they are adequate and that extra holes may otherwise be necessary, that with hollow sections or internal compartments galvanizing the internal surfaces eliminates the danger of hidden corrosion occurring in service, and that where a design includes sealed hollow sections, guidance on correct venting and drainage must be incorporated. Its fabrication notes state that external stiffeners, welded gussets and webs should have their corners cropped, with as large a gap as structural strength allows and a radius where welding runs around the edge. It is industry process and detailing guidance: it does not set a vent or drain hole size, position or number, a member capacity, a coating class, a durability class or a project approval, and it is not a structural design code.

Industry association guidance page; read 2026-09-25 · ID: ga-design-galvanizing
Source tier 3

American Galvanizers Association — Galvanic corrosion and the galvanic cell (opens in a new tab)

Industry association education page explaining the galvanic corrosion mechanism. It describes two primary types of galvanic cell — the bi-metallic couple, which it compares to a battery consisting of two dissimilar metals immersed in an electrolyte solution with an external conductive path, and the concentration cell, in which anode and cathode are the same metal or alloy and the driving force comes from a difference in concentration across the surfaces — and lists the four elements it states are necessary for corrosion to occur in a galvanic cell: an anode, where the galvanic reactions generate electrons and corrosion occurs; a cathode, which receives electrons and is protected from corrosion; an electrolyte, the conductor through which current is carried; and a return current path, the metallic pathway connecting anode to cathode, often the underlying metal substrate. It states that all four are necessary, that removing any one of them stops the current flow so that galvanic corrosion does not occur, that substituting a different metal for the anode or cathode may reverse the current and move the corrosion to the other electrode, and that the galvanic series lists metals and alloys in decreasing order of electrical activity. It explains a mechanism only: it gives no corrosion rate, no coating or isolation specification, no fastener rule, no service life and no project approval, and it is not a design code.

Industry education page, last updated April 2022; read 2026-09-25 · ID: aga-galvanic-corrosion
Source tier 1

UK Ministry of Housing, Communities and Local Government — Protection from falling, collision and impact: Approved Document K (opens in a new tab)

Official GOV.UK publication page for the England approved document on protection from falling, collision and impact, described by the publisher as “building regulation in England covering the buildings users protection from falling, collision and impact in and around the building”. Its Details summary states that this edition covers protection from falling, collision and impact and includes designing staircases, ladders, ramps, guarding and vehicle barriers in and around all types of buildings; that since April 2023 the Building Safety Regulator has a duty under the Building Safety Act 2022 to keep under review the safety and standards of all buildings in England, including advising government on updates to the Approved Documents; and that this edition was updated by combining Approved Document N on glazing and some overlapping guidance from Approved Document M. Only the publication page and its summary were read in this check; the PDF was not machine-extracted, so no clause text, guard height, load value or dimension is attributed to it here. It is England-only technical guidance for one part of the building regulations: it does not decide whether a particular balcony, terrace, guard or pergola project needs approval, satisfies the requirement or is lawful anywhere else.

Published 3 January 2013; publication page and current-edition summary read 2026-09-26 · ID: govuk-approved-document-k
Source tier 1

UK Government (GOV.UK) — Building regulations approval: When you need approval (opens in a new tab)

Official GOV.UK service page on building regulations approval. It states that you must check whether you need approval before you construct or change buildings in certain ways; that building regulations approval is different from planning permission and that you might need both; that the Building Regulations 2010 cover the construction and extension of buildings; and that approval may also be needed for many alteration projects, with examples including replacing fuse boxes and connected electrics, changing electrics near a bath or shower, putting in a fixed air-conditioning system, replacing windows and doors, replacing roof coverings on pitched and flat roofs, and installing or replacing a heating system. It adds that works not listed could still need approval or follow special rules, that you do not need to obtain approval yourself if you use someone registered with a competent person scheme, and that readers should find out about the separate rules in Scotland and Northern Ireland. It is an England-facing process service page: it does not decide whether a specific pergola, terrace or balcony project needs approval, name the applicable edition or amendments, or transfer to another jurisdiction.

Living GOV.UK service page; read 2026-09-26 · ID: govuk-building-regulations-approval
Source tier 1

The National Archives — legislation.gov.uk — Building Regulations 2010, Schedule 1 — Requirements, Part K (protection from falling, collision and impact) (opens in a new tab)

Official revised statutory text of the requirements in Schedule 1 to the Building Regulations 2010. In the part headed protection from falling it records that stairs, ladders and ramps used for movement between different levels must be safe and that requirement K1 applies only to stairs, ladders and ramps forming part of the building, and it states requirement K2: any stairs, ramps, floors and balconies and any roof to which people have access, and any light well, basement area or similar sunken area connected to a building, shall be provided with barriers where it is necessary to protect people in or about the building from falling, with a further requirement covering the safety of barriers. It is the functional requirement only: it states no barrier height, gap limit, load, spacing or product rule, and it does not determine whether a project needs approval, whether a specific guard or frame satisfies the requirement, or which national or amended version applies. Technical detail and dimensions sit in the approved documents and guidance for the relevant UK nation, and the applicable nation must be confirmed first.

SI 2010/2214 revised text; read 2026-09-26 · ID: legislation-uk-building-regs-2010-schedule-1
Source tier 1

Scottish Government — Building standards technical handbook 2022: domestic — 4.4 Pedestrian protective barriers (opens in a new tab)

Official Scottish Government section of the domestic building standards technical handbook, which states that it provides guidance on achieving the standards set in the Building (Scotland) Regulations 2004 and applies to a building warrant submitted on or after 1 June 2022. Its mandatory Standard 4.4 requires every building to be designed and constructed so that every sudden change of level accessible in or around the building is guarded by pedestrian protective barriers, with a limitation where barriers would obstruct the use of the guarded area. The guidance states that a protective barrier should be provided at the edge of every floor, stair, ramp, landing, raised floor or other raised area to which people have access where the difference in level is 600 mm or more, and at any change in direction on a raised access or circulation route; that in and around domestic buildings openings in a barrier should prevent the passage of a 100 mm diameter sphere; that a barrier should be designed and constructed so that it cannot easily be climbed by young children, minimising potential hand and footholds; and that barriers and any wall, partition or fixed glazing accepted instead should resist loads calculated in accordance with BS EN 1991-1-1 and the associated PD 6688-1-1. Its height table gives 1,100 mm for locations other than the listed cases, with lower listed values including 900 mm to a gallery, landing or raised area within a dwelling. It is Scottish domestic guidance: it is not a pergola standard, does not approve a project, and its figures are not transferable to another jurisdiction, structure or occupancy without the applicable local rules.

Published 1 June 2022; section read 2026-09-26 · ID: scotland-technical-handbook-4-4-barriers
Source tier 3

American Wood Council — DCA 6 — Prescriptive Residential Wood Deck Construction Guide (based on the 2015 International Residential Code) (opens in a new tab)

Freely published American Wood Council prescriptive guide for single-level residential wood decks attached to a house to resist lateral forces, written against the 2015 International Residential Code with bracketed IRC references. Its minimum-requirements section limits the document to that structure type and states that overall deck length shall be equal to or less than overall deck width; its ledger section requires the house band or rim joist to be capable of supporting the new structure and directs a non-ledger layout or full plan submission where that cannot be verified; its prohibited-ledger section lists attachments to exterior veneers (brick, masonry, stone), to hollow masonry and to cantilevered floor overhangs or bay windows as prohibited, with a non-ledger deck required in those cases; its siding-and-flashing text requires the exterior finish to be removed before the ledger is installed and approved corrosion-resistant flashing at every ledger-to-wall connection in wood-framed construction, and warns against aluminium in direct contact with copper-containing preservative-treated lumber; and its lateral-load text requires the structure to be positively anchored to the primary structure with hold-down tension devices of a stated allowable-stress-design capacity near the deck edges over sheathed wall framing. The document itself states that no assurance is given that designs and construction made in accordance with it meet the requirements of any particular jurisdiction. It is a United States prescriptive deck guide: it is not a pergola, terrace, balcony or roof standard, supplies no pergola capacity, connection value or approval, and transfers to no other country.

Copyright 2018 American Wood Council; PDF read 2026-09-30 · ID: awc-dca6-prescriptive-deck-guide
Source tier 1

Irish Statute Book — Planning and Development Regulations 2001 — Schedule 2, Part 1, Class 3 (opens in a new tab)

Official original statutory-instrument text for Ireland. Schedule 2, Part 1, Class 3 covers the construction, erection or placing within the curtilage of a house of specified structures including a tent, awning, shade or other object, greenhouse, garage, store, shed or similar structure, subject to Article 9 and conditions including position behind the front wall, a cumulative 25-square-metre floor-area cap, retention of at least 25 square metres of rear or side private open space, stated finish and domestic-use conditions, and height limits of 4 metres for a tiled or slated pitched roof and 3 metres in other cases. The class does not name a pergola or decide whether a particular structure fits it; the original made text must be read with current amendments, Article 9, local facts and the responsible planning authority.

S.I. No. 600/2001 original made text; read 2026-10-14 · ID: ireland-planning-regulations-2001-class-3
Source tier 1

Department of Housing, Local Government and Heritage — Planning and Development Regulations 2001–2025 — Schedule 2 consolidated text (opens in a new tab)

Departmental consolidation of Schedule 2 exemptions through the 2001–2025 regulations. Its cover expressly states that the text is an unofficial consolidation with no legal status and that the official regulations as enacted and amended must be consulted. It is used to check the current editorial continuity of Class 3, not as authoritative legislation or a project decision.

Unofficial consolidation through 2025; read 2026-10-14 · ID: ireland-exempted-development-consolidation
Source tier 1

Office of the Planning Regulator — Planning Leaflet 8 — A Guide to Doing Work Around the House (opens in a new tab)

Official Irish planning-regulator guide explaining householder exempted-development conditions, the Article 9 restrictions that can remove an exemption, the exclusion of flats and apartments from the described house exemptions, and the route to request a declaration from the planning authority where exempt status is uncertain. It is public guidance, not legislation, a project-specific declaration or permission.

Official planning leaflet; PDF read 2026-10-14 · ID: ireland-opr-house-works
Source tier 1

Department of Housing, Local Government and Heritage — Planning and Development Act 2024 — commencement status (opens in a new tab)

Official departmental status page listing phased commencement orders for the Planning and Development Act 2024 through May 2026. It establishes that commencement is phased rather than all-at-once; it does not interpret a pergola, decide which exemption applies or make proposed regulatory changes effective. The operative statutory and regulatory provisions must be confirmed for the project date.

Official phased-commencement page updated 13 May 2026; read 2026-10-14 · ID: ireland-pda-2024-commencement
Source tier 3

Préfecture de l'Indre — services de l'État — Étude d'adaptation climatique d'un collège — canisses d'ombrage (opens in a new tab)

A site-specific French college adaptation study showing bamboo or heather canisses placed over an existing transparent canopy and fixed to the existing frame, with wet-period rot or fungal growth and eventual replacement identified as constraints. Its layout and approximate replacement timing are not a universal installation detail or service-life claim.

Government-hosted project study; document created 2024-06-07; checked 2026-08-20 · ID: indre-canisse-shade-study
Source tier 3

Préfecture des Bouches-du-Rhône — Ma maison est proche d'un massif forestier — autodiagnostic incendie (opens in a new tab)

Departmental wildfire guidance stating that an attached pergola or awning covered with fabric, canisse or vegetation can ignite and promote fire spread to a dwelling. It is a French wildfire-vulnerability source, not a material fire classification, global clearance rule or product test.

French departmental wildfire guidance; document created 2014-08-19; checked 2026-08-20 · ID: bouches-du-rhone-wildfire-pergola-covers
Source tier 1

Service-Public.fr — Direction de l'information légale et administrative — Quelle autorisation d'urbanisme pour une pergola, un carport ou un abri à bois ? (opens in a new tab)

Official French planning guidance explaining that the applicable filing depends on local planning rules, location, project classification and footprint. It does not determine whether adding a removable shade mat changes a specific project's authorization and does not apply outside France.

Official French guidance; verified 2025-04-11; checked 2026-10-16 · ID: france-pergola-planning-permission
Source tier 1

Service-Public.fr — Direction de l'information légale et administrative — Quelle autorisation d'urbanisme pour construire une véranda ? (opens in a new tab)

Official French planning guidance treating a veranda as an exterior alteration that increases the building's area, with the filing route depending on location, local planning, footprint, floor area and resulting total floor area. It supports a France-only reassessment boundary when a pergola is enclosed; it does not prove that every screened or glazed pergola is legally a veranda or transfer French thresholds elsewhere.

Official French guidance; verified 2025-04-11; checked 2026-08-31 · ID: france-veranda-planning-permission
Source tier 1

New Zealand Ministry of Business, Innovation and Employment — Building Performance — 8. Shelters, shades and carports — building consent exemption guidance (opens in a new tab)

Official New Zealand guidance separating carport exemptions up to 20 square metres from conditional 20-to-40-square-metre pathways involving a Chartered Professional Engineer or Licensed Building Practitioner. The detailed conditions must still be checked; the thresholds do not apply outside New Zealand and do not establish structural capacity or project approval.

Official guidance updated 2025-09-09; checked 2026-08-26 · ID: nz-carport-exemptions
Source tier 1

Czech Republic Ministry for Regional Development — Pergola a přístřešek podle zákona č. 283/2021 Sb. — updated official methodology (opens in a new tab)

Official Czech methodology stating that the Building Act does not define pergola or shelter and that modern roofing systems and integrated technologies can make the labels misleading. It directs assessment toward actual construction characteristics, purpose and functional properties, and separately distinguishes specified owner-built shelters subject to supervision or professional qualification from shelters requiring a construction contractor and site manager; its renewable-energy small-structure examples require contractor delivery under the stated professional management. This is Czech methodological context, not a universal definition, project classification, permit outcome or substitute for current planning, fire and local checks.

Official page updated 2026-05-06 and methodology updated 2026-03; checked 2026-10-12 · ID: czech-small-shelters
Source tier 1

Slov-Lex — Ministry of Justice of the Slovak Republic — 25/2025 Z. z. Building Act — time version effective 2025-11-01 (opens in a new tab)

Official Slovak legal text listing specified ground-level structures fixed to the ground, including shelters and garages, among small structures when the stated size and other conditions are met. That classification does not by itself establish a general right to self-build or decide notification, project review, planning, fire-safety, local requirements or whether a product sold as a pergola fits that category.

Official consolidated time version effective 2025-11-01 through 2026-12-31; checked 2026-10-12 · ID: slovakia-building-act-2025
Source tier 1

New Zealand Ministry of Business, Innovation and Employment — Building Performance — Homeowner rights and obligations (opens in a new tab)

Official New Zealand guidance on owner responsibility, detailed quotes, written contracts, disclosure and standard-checklist triggers, Licensed Building Practitioners for restricted building work, and completion records. It does not make every pergola restricted building work, require an LBP for every pergola task, transfer New Zealand's NZD 30,000 contract threshold elsewhere or validate any contractor.

Official guidance updated 2026-09-09; checked 2026-10-17 · ID: nz-homeowner-rights-building-work
Source tier 3

U.S. Occupational Safety and Health Administration — Winter weather hazards — clearing snow from roofs and working at heights (opens in a new tab)

Official workplace guidance requiring snow-removal hazard planning, structural access assessment and preference for methods that avoid roof access where possible. It is an occupational-safety source, not a residential operating instruction or structural calculation.

Living official guidance; checked 2026-08-05 · ID: osha-winter-roof-snow
Source tier 3

Michigan State Police — MIREADY — Preventing Roof Ice Dams (opens in a new tab)

Official Michigan winter-preparedness guidance describing how repeated melt-freeze cycles can create an eave ice barrier, pond water and obstruct gutters or downspouts. It concerns building roofs over attic spaces, not an open pergola or a product-specific winter rating.

Living state-government guidance; checked 2026-08-07 · ID: michigan-roof-ice-dams
Source tier 3

University of Alaska Fairbanks Cooperative Extension Service — Keeping Your House Operating During a Cold Alaska Winter — drain pipes (opens in a new tab)

University extension guidance explaining that standing water and repeated small, slow flows can freeze inside cold drainage sections and progressively block them. It addresses residential drainage in Alaska and does not validate a pergola drain detail, heat-trace design or thawing method.

Reviewed 2022; checked 2026-08-07 · ID: uaf-cold-weather-drain-freeze
Source tier 1

Service-Public.fr — Direction de l'information légale et administrative — Garantie décennale des constructeurs (opens in a new tab)

French official guidance on when builders must hold decennial liability insurance and provide evidence before work starts. Coverage depends on French law, the contracting role, declared work and policy period; it does not establish that every pergola project or participant is covered.

Official French guidance; verified 2024-01-31; checked 2026-08-17 · ID: france-builder-decennial-insurance
Source tier 1

New Zealand Ministry of Business, Innovation and Employment — Building Performance — CodeMark product certification scheme and public register (opens in a new tab)

New Zealand guidance stating that a current CodeMark certificate must be accepted by Building Consent Authorities only when the product or method is used within the certificate details, conditions and limitations. It is a New Zealand product-evidence route, not a global approval, a complete pergola design or proof that an unlisted kit, changed configuration, foundation or site installation is covered.

Living official guidance; checked 2026-08-30 · ID: nz-codemark-certification
Source tier 3

Energy Safe Victoria — GIS 11 — Portable heaters for use outdoors in public places (opens in a new tab)

Victorian gas-safety guidance for portable outdoor heaters, including outdoor-only use, manufacturer instructions, product-specific combustible clearances, stable level placement and the distinction between heater certification and a mounting frame. Its public-place and Victorian regulatory context does not create universal pergola clearances or approve a particular installation.

Reviewed 2025-01-01; checked 2026-09-16 · ID: esv-portable-outdoor-heaters
Source tier 3

Energy Safe Victoria — Gas and LPG safety outdoors (opens in a new tab)

Victorian consumer guidance warning that outdoor LPG appliances can produce carbon monoxide where ventilation is insufficient, must not be used indoors, and need upright cylinders on a firm, level, non-combustible base. It does not classify every screened pergola or replace the appliance instructions and local gas rules.

Reviewed 2025-10-14; checked 2026-09-16 · ID: esv-lpg-outdoor-safety
Source tier 3

Health Canada — Electrical product safety (opens in a new tab)

Canadian consumer guidance on recognized certification marks and portable electric-heater precautions, including distance from combustibles, avoiding extension cords and power bars, and keeping outdoor electrical products dry and away from water. Its one-metre portable-heater advice is not a universal clearance for fixed radiant heaters or a substitute for local installation rules.

Page updated 2026-08-12; checked 2026-09-16 · ID: health-canada-electrical-product-safety
Source tier 3

U.S. National Park Service — Outdoor Lighting Principles (opens in a new tab)

Government principles for necessary, targeted, shielded, controlled, low-level and warmer outdoor lighting in park settings. They inform glare and light-spill decisions but are not a universal residential lighting code or pergola illuminance schedule.

Updated 2025-06-17; checked 2026-09-03 · ID: nps-outdoor-lighting
Source tier 1

European Commission — DG Internal Market, Industry, Entrepreneurship and SMEs — Machinery — EU machinery legislation, Directive 2006/42/EC and Regulation (EU) 2023/1230 (opens in a new tab)

Official Commission page describing machinery as an assembly of components, at least one of which moves, joined for a specific application with a drive powered by energy other than human or animal effort; stating that the Directive also applies where existing machinery is modified to such an extent that it becomes de facto new machinery; and recording that Regulation (EU) 2023/1230 was adopted on 14 June 2023 and applies on a mandatory basis from 20 January 2027. It is EU product-law context for classification questions; it does not decide whether a particular powered pergola, drive or retrofit is machinery, does not supply a force limit or a pergola requirement, and is not a global rule.

Living official page; Regulation applies mandatorily from 2027-01-20; checked 2026-09-22 · ID: eu-machinery-legislation
Source tier 2

Health and Safety Executive (Great Britain) — Powered gates — the basics (opens in a new tab)

Official Great Britain guidance stating that powered gates are machines that must be properly designed, manufactured, installed and maintained, that much of the advice also applies to other powered building products such as pedestrian doors, screens, shutters, windows, vents and awnings, and listing impact, crushing, trapping, entanglement, electric-shock and weather-related hazards together with documentation, competent installation, regular checking, availability of a safe condition such as hold-to-run, and taking dangerous equipment out of use. It is a hazard-classification and control-pattern reference for Great Britain gate installations, not a pergola standard, force limit, drive rating or approval.

Page updated 2023-03-16; checked 2026-09-22 · ID: hse-powered-gates
Source tier 1

PlanSA — NCC 2025 state updates (opens in a new tab)

Official South Australian page distinguishing Building Code adoption on 1 May 2027 from Plumbing Code adoption on 1 May 2026. The split must not be collapsed into one whole-of-NCC date.

Living official page; browser-checked 2026-08-03 · ID: sa-ncc-2025-adoption
Source tier 1

Welsh Government — Building regulations: approved documents (opens in a new tab)

Official Welsh collection of guidance for complying with building regulations in Wales. It is a Wales-specific entry point, not evidence that England, Scotland or Northern Ireland guidance applies or that a particular pergola is approved.

Living official collection; checked 2026-07-30 · ID: wales-approved-documents
Source tier 1

Scottish Government — Building standards (opens in a new tab)

Official Scottish collection linking building regulations, technical handbooks and the building-warrant pathway. Applicability depends on the relevant date and project route; the collection is not an England, Wales or Northern Ireland approval path.

Living official collection; checked 2026-07-30 · ID: scotland-building-standards
Source tier 3

Oxford University Press — Oxford Advanced Learner's Dictionary — pergola: definition, pronunciation and word origin (opens in a new tab)

Institutional learner's dictionary recording the British pronunciation /ˈpɜːɡələ/ and the North American /ˈpɜːrɡələ/, a definition as a wooden structure in a garden for plants to grow over and for people to sit or walk under, and a word origin dating the English borrowing to the mid 17th century, from Italian, from Latin pergula 'projecting roof', from pergere 'come or go forward'. The entry records a word, a pronunciation and one general definition; it is not a structural, material, product or legal classification and bounds no built configuration.

Current dictionary entry; read 2026-10-01 · ID: oxford-learners-pergola
Source tier 3

Czech Language Institute, Czech Academy of Sciences (ÚJČ AV ČR) — Internetová jazyková příručka — pergola: hyphenation, gender, declension and dictionary excerpts (opens in a new tab)

Official Czech language reference giving the headword pergola, its hyphenation per-go-la, feminine gender and full singular and plural declension, and reprinting older Czech dictionary definitions: ASCS describes it as an architectural light arbour (lehké loubí) of free-standing columns joined at the top and overgrown with climbing plants forming an airy ceiling, and SSJČ records the Italian origin (z it.). It documents Czech spelling, grammar and one borrowed term; it classifies no structure, material or approval.

Current language reference; read 2026-10-01 · ID: ujc-pergola
Source tier 3

Czech Language Institute, Czech Academy of Sciences (ÚJČ AV ČR) — Internetová jazyková příručka — altán: hyphenation, gender, declension and dictionary excerpts (opens in a new tab)

Official Czech language reference recording the headword altán (hyphenated al-tán, masculine inanimate), its full singular and plural declension and reprinted Czech dictionary senses: ASCS describes an open or glazed small structure in a garden or park (otevřená n. zasklená malá stavba v zahradě, v parku, besídka) and, in architecture, a low tower-like superstructure of a house, and SSČ records a smaller airy structure or summerhouse (menší vzdušná stavba, besídka). It documents a Czech word that names a garden pavilion or summerhouse and is not a synonym for a pergola; it classifies no pergola, material, product or approval.

Current language reference; read 2026-10-03 · ID: ujc-altan
Source tier 3

Building and Environment — Evaluation of outdoor thermal comfort in sunlight, building shade, and pergola shade during summer in a humid subtropical region (opens in a new tab)

Direct pergola-shade field study in Nagoya with 42 collegiate male participants and ETU, UTCI and OUT_SET* indices. Reported index differences are specific to its climate, dates, subjects, radiation and plant-shade setup and are not universal air-temperature reductions.

Peer-reviewed field study; 2014; DOI 10.1016/j.buildenv.2014.10.002 · ID: horikoshi-pergola-thermal
Source tier 3

ADEME — Canicule : comment rester au frais sans climatisation ? (opens in a new tab)

French public guidance connecting terrace shade, pergolas, vegetation and evapotranspiration, and recommending deciduous planting where summer shade and winter solar access are intended. It is household heat-adaptation guidance, not a pergola cooling rating or plant-selection rule for other climates.

Official French guidance published 2026-05-29; browser-checked 2026-08-19 · ID: ademe-summer-comfort-vegetation
Source tier 3

Cerema — Étude surchauffe urbaine — Châteauneuf-sur-Charente (opens in a new tab)

French public-sector study describing vegetated pergolas as shade devices for seating or pedestrian routes and discussing radiant-exposure and summer-comfort mechanisms. It is local planning evidence, not a controlled product test or a transferable temperature guarantee.

Official local study report; 2024-02; checked 2026-08-19 · ID: cerema-vegetated-pergola-urban-heat
Source tier 3

Office français de la biodiversité — Végétal local (opens in a new tab)

Official French framework for traceable wild plants matched to defined biogeographic regions. It supports a France-specific local-origin and biodiversity check; it does not name a universally suitable pergola climber or replace site horticultural assessment.

Living official French biodiversity guidance; checked 2026-08-19 · ID: ofb-vegetal-local
Source tier 3

Ville de Paris — Végétaliser les toits et les murs (opens in a new tab)

Paris guidance distinguishing self-clinging, twining and tied climbing plants and noting the water, nutrient and maintenance burden of off-ground systems. The support mechanisms inform a pergola brief, but the page addresses Paris building greening and does not establish pergola structural capacity.

Living municipal guidance updated 2026; checked 2026-08-19 · ID: paris-climbing-plant-support
Source tier 3

University of New Hampshire Extension — Pruning and Training Grapes in the Home Vineyard (opens in a new tab)

Cold-climate home-vineyard guidance linking grape training systems to trellis design and describing arbor shade-versus-fruit, annual pruning, mature-vine, crop and wind-support considerations. Its dimensions, plant counts, timing and cultivar advice do not transfer universally.

University extension fact sheet published 2021-02; checked 2026-09-07 · ID: unh-grape-arbor-training
Source tier 1

European Commission — Summary of references of harmonised standards under Regulation (EU) No 305/2011 (opens in a new tab)

Commission summary showing EN 13561:2004+A1:2008 in the CPR harmonised-standards list as generated on 9 February 2026. The summary consolidates Official Journal references for information and does not itself create legal effects; the applicable OJ record and transition period still require a dated check.

Informational consolidated list generated 2026-02-09 · ID: eu-cpr-harmonised-standards-2026