Windows, Doors & Glazing
196 sources in the library on windows, doors & glazing, 33 on this page cited in a published note. Each one says what the document covers and what it is good for. Name a source to see which document it is and where to read it. One at a time. Page 1 of 5.
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Department of Finance (Northern Ireland)
Northern Ireland's equivalent of Approved Document L Volume 1. This edition came into effect on 30 June 2022 and gives guidance on regulations 39 to 47 of the Building Regulations (Northern Ireland) 2012, which set the requirements for conservation of fuel and power in dwellings, including the limiting U-values a replacement window or door must meet in Northern Ireland. It replaced the 2012 version, and the Department publishes an awareness briefing and FAQ setting out the differences. The full text is at https://www.finance-ni.gov.uk/sites/default/files/publications/dfp/TB%20Part%20F1%202022_On-Line%20Publication.pdf. Cite this rather than Approved Document L whenever a note gives a window U-value for a reader in Northern Ireland.
Cited in Insulation: The Complete Guide.
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Ministry of Housing, Communities and Local Government
Table 1.1 sets minimum intermittent extract rates: kitchen with a cooker hood extracting outside 30 l/s, kitchen without one 60 l/s, utility room 30 l/s, bathroom 15 l/s, sanitary accommodation 6 l/s. Extract terminals and fans other than cooker hoods should be as high as practicable and no more than 400mm below the ceiling; a cooker hood should sit between 650mm and 750mm above the hob if the manufacturer gives no figure. Table 1.7 requires background ventilators of at least 8000mm2 equivalent area in habitable rooms and kitchens for a dwelling, 10,000mm2 for a single-storey dwelling. Background ventilators should be at least 1700mm above floor level and at least 500mm from a fan in the same room. On replacement windows, paragraph 3.14 says new windows must carry background ventilators no smaller than the originals, and paragraph 3.15 gives the fallback minimums where the old size is unknown: 8000mm2 habitable rooms, 8000mm2 kitchen, 4000mm2 bathroom. Paragraph 3.32 confirms that replacing an extractor fan or cooker hood on existing cabling is not notifiable.
Cited in Adding an Ensuite: Cost, Layout & Plumbing, Annexe & Granny Flat: Cost, Planning & Rules, Basement & Cellar Conversions: Cost, Bathroom Remodel Cost: 2026 UK Price Guide and 44 more.
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Ministry of Housing, Communities and Local Government
The standard that decides whether a loft ladder is legal and when a raised deck needs a balustrade. Published 3 January 2013, it covers protection from falling, collision and impact including stairs, ladders, ramps, guarding and vehicle barriers. Paragraph 1.31 states that retractable ladders must not be used as a means of escape. Paragraph 1.32 permits a fixed ladder, with fixed handrails on both sides, only for access in a loft conversion containing one habitable room, and only where there is not enough space without altering the existing space for a compliant stair, which is the rule that catches most loft ladder installations. Paragraph 1.29 restricts alternating tread stairs to loft conversions. For a private stair the maximum pitch is 42 degrees (Table 1.1 note 1), the normal relationship between rise and going is twice the rise plus the going between 550mm and 700mm, and for dwellings external tapered steps forming part of the building need a going of at least 280mm. Paragraph 3.1 requires guarding wherever it is reasonably necessary for safety at the edge of a floor, gallery, balcony, roof, light well, basement or similar sunken area. Paragraph 3.2 requires guarding to be at least the height in Diagram 3.1, allows any wall, parapet or balustrade to serve as guarding, and requires it to resist the loads in BS EN 1991-1-1 with its UK National Annex and PD 6688-1-1, with BS 6180 for barrier and infill panel design. Handrails should be positioned 900mm to 1000mm from the pitch line or floor.
Cited in All You Need To Know About Double Glazing Repairs, Basement & Cellar Conversions: Cost, Bifold Doors: Cost, Sizes & Alternatives, Blown Window Repair Cost: 2026 UK Price Guide and 41 more.
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Ministry of Housing, Communities and Local Government
The in-force U-value tables a DIY insulation or door note must quote, with the exact numbers. Table 4.2, limiting U-values for new fabric elements in existing dwellings, sets roof 0.15, wall 0.18, floor 0.18, swimming pool basin 0.25, window 1.4 or Window Energy Rating Band B minimum, rooflight 2.2, doors with more than 60 per cent of the internal face glazed 1.4 or Doorset Energy Rating Band C minimum, and other doors 1.4 or Doorset Energy Rating Band B minimum. Table 4.3, for existing elements, gives a roof threshold of 0.35 and an improved value of 0.16, which is the figure a loft insulation note needs: paragraph 4.12 says a retained element whose U-value is higher than the column (a) threshold, for example through a loft or garage conversion, should be upgraded to the column (b) value. Paragraph 4.13 allows a lesser upgrade only where the improved value is not technically or functionally feasible or would not achieve a simple payback of 15 years or less. Paragraph 4.8 requires a replacement element to be no worse than the one it replaces as well as meeting Table 4.2. Paragraph 4.10 gives the heritage exception: where character must be maintained, a centre pane U-value of no more than 1.2 or low-emissivity secondary glazing. Note 9 records that the timber window concession of 1.6 or Band C ended on 14 June 2023. The 2021 edition came into force on 15 June 2022; a 2026 edition exists at https://assets.publishing.service.gov.uk/media/69c122a6cfa346b9d4704a55/ADL1_2026.pdf.
Cited in Adding an Ensuite: Cost, Layout & Plumbing, Adding Porch, All You Need To Know About Double Glazing Repairs, Annexe & Granny Flat: Cost, Planning & Rules and 136 more.
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Ministry of Housing, Communities and Local Government
The 2026 edition takes effect on 24 March 2027 for work not connected with higher-risk building work, and 24 September 2027 where it is, with transitional arrangements in Circular Letter 01/2026. Table 3.1 sets limiting U-values for new dwellings: all roof types 0.16, wall 0.26, floor 0.18, window 1.6, rooflight 2.2, doors 1.6 W per square metre per kelvin, with air permeability 8.0 cubic metres per hour per square metre at 50Pa. Table 3.2 covers new elements in existing dwellings, that is extensions and loft conversions: roof 0.15, wall 0.18, floor 0.18, window 1.4 or Window Energy Rating Band B, rooflight 2.2. Table 3.3 covers upgrading existing elements: a roof with a U-value worse than the 0.35 threshold must be improved to 0.16, and note 2 confirms that for dormer windows the roof figure covers the roof parts and the wall figure the cheeks, while note 3 allows a higher U-value where the standard would limit head room provided the insulation plus air gap is at least the depth of the rafters.
Cited in Insulation: The Complete Guide.
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Ministry of Housing, Communities and Local Government
Supports Part O of Schedule 1 to the Building Regulations 2010 (requirement O1 and regulation 40B); the 2021 edition took effect on 15 June 2022 in England, with transitional relief for work notified before that date and started before 15 June 2023. Critically, paragraph 0.3 limits the guidance to NEW residential buildings only (dwellings, residential institutional and residential other, plus shared communal rooms, common spaces and live/work units), and paragraph 0.7 applies it only to the residential parts of mixed-use buildings. Compliance is by the simplified method (Section 1) or dynamic thermal modelling to CIBSE TM59 (Section 2); the simplified method splits England into a high risk location (urban and some suburban London listed in Appendix C, with guidance for parts of central Manchester) and a moderate risk location (the rest of England). Table 1.1 (cross-ventilated) caps glazing as a percentage of floor area at north 15 high risk / 18 moderate, east 18/18, south 15/15, west 18/11, with the most glazed room capped at north 37/37, east 37/37, south 22/30, west 37/22. Table 1.2 (no cross-ventilation) caps glazing at north 15/18, east 11/18, south 11/15, west 11/11, most glazed room north 26/26, east 18/26, south 11/15, west 18/11.
Cited in Glazed Extensions: The Complete UK Guide, Glazing Explained: U-values, Low-E, Argon & Spacers, Rooflights & Skylights: Materials & Types.
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Ministry of Housing, Communities and Local Government
The security standard for doors and windows, ISBN 978 1 85946 601 8, in force from 5 March 2015 and last updated 22 November 2024. Requirement Q1 applies only to new dwellings, and to easily accessible doors and windows giving access into a dwelling from outside, into a building containing flats from outside, or into a flat from the common parts. Paragraph 1.2 requires secure doorsets tested to PAS 24:2012 or designed to Appendix B, with STS 201 Issue 5:2013, LPS 1175 Issue 7:2010 security rating 2, STS 202 Issue 3:2011 burglary rating 2 and LPS 2081 Issue 1:2015 security rating B accepted as equivalents. Paragraph 1.3 caps a letter plate aperture at 260mm x 40mm and points to DHF technical specification TS 008:2012. Paragraph 1.4 requires a door viewer on the main entrance door unless clear glass or an adjacent window serves the purpose, plus a door chain or limiter. Paragraph 2.2 requires ground floor, basement and other easily accessible windows and rooflights to be tested to PAS 24:2012, with STS 204 Issue 3:2012, LPS 1175 rating 1 and LPS 2081 rating A as equivalents, and paragraph 2.3 requires frames to be mechanically fixed to the structure. Appendix B specifies a doorset in solid or laminated timber to a minimum density.
Cited in Cheaper Alternative Industrial Style Windows Cost: 2026 UK Price Guide, Composite vs uPVC vs Timber Front Doors, Extension Building Regulations: Homeowner Guide, Garage Doors: Types & Cost and 3 more.
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Ministry of Housing, Communities and Local Government
The landing page for Approved Document F, Ventilation. Volume 1 covers dwellings and Volume 2 buildings other than dwellings; the current edition took effect 15 June 2022 and a 2026 edition is published on the same page. This is the document that sets background ventilation (trickle vent) equivalent areas and intermittent extract rates, and the reason replacement windows must not make existing ventilation worse. Volume 1 is a 859 KB PDF, Volume 2 is 662 KB.
Cited in All You Need To Know About Double Glazing Repairs, Building Regulations Explained for Homeowners, How to Fit a Bathroom Suite.
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The National Archives (legislation.gov.uk), Scottish Statutory Instruments
SCOTLAND, latest revised version with no outstanding effects, and several of these contradict England. Type 20 makes a door, window or rooflight warrant-exempt EVEN WHERE THE FRAME IS REPLACED, so a Scottish window replacement needs no building warrant and no FENSA or Certass notification, unlike England where replacing a window is notifiable building work; it must still meet the regulations, including the 1.4 W/m2K or WER Band B standard. Type 19 exempts open raised external decking unless it is at a height of more than 1.2 metres. Type 21 exempts a paved area or hardstanding unless it exceeds 200 SQUARE METRES or forms part of a required access, a far more generous threshold than England's 5 square metre front garden rule. Type 22 exempts extra-low voltage electrical installations not exceeding 50 volts AC or 120 volts DC. Type 24 exempts like-for-like replacement of fittings including sanitary facilities, rainwater gutters and downpipes, solid fuel appliances, electrical fixtures, ventilation fans and kitchen fitments, but expressly NOT doors, windows or rooflights, nor oil or gas fired boilers. Type 25 exempts like-for-like replacement of flooring, lining, cladding, covering or rendering internally or externally. All are conditional on the work meeting the relevant requirements of the regulations.
Cited in Replacing Misted Double Glazing Units Cost: 2026 UK Price Guide.
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Welsh Government
Wales retains Part N, which England revoked in 2013 and folded into Part K, so a note that says 'Part K in England, Part N in Wales' for safety glazing is correct. Current Welsh guidance incorporating September 2013 amendments, published 5 April 2017. Covers glazing in critical locations (below 800 mm from floor level in a window, below 1500 mm in a door or a side panel within 300 mm of a door), safe breakage, manifestation of large glazed areas, and safe opening, closing and cleaning of windows. PDF at gov.wales/sites/default/files/publications/2019-05/building-regulations-guidance-part-n-glazing-safety.pdf. Also states that a replacement window opening should give at least the same potential for escape as the one it replaces.
Cited in Grey Coloured Upvc Windows Cost: 2026 UK Price Guide.
- strong RN-XMDL91 cited
British Fenestration Rating Council
The BFRC describes itself as the UK's most trusted and widely recognised rating organisation for verifying the energy performance of windows and doors. Its Window Energy Rating runs on a scale from A++ down to E and combines three measured factors rather than one: solar gain, the heat travelling in through a window, counted positive; thermal transmittance or U-value, the heat loss out of a window, counted negative; and air leakage, the uncontrolled air flow out of a window that causes heat loss, also negative. BFRC makes the point that a rating is more comprehensive proof than a single U-value. This matters because Approved Document L Table 4.2 accepts either a 1.4 W/(m2K) U-value or Window Energy Rating Band B for replacement windows, so a reader can meet the standard by either route.
Cited in Replacing Misted Double Glazing Units Cost: 2026 UK Price Guide, Replacing Windows: Process, FENSA & Cost, Windows and Doors: The Complete UK Guide (2026).
- strong RN-ONRM0Q cited
BSI
the standard that sets the maximum gas leakage rate for a sealed insulating glass unit
Cited in Glazing Explained: U-values, Low-E, Argon & Spacers.
- strong RN-PSAEIM cited
BSI (British Standards Institution)
STATUS: CURRENT. The live edition is BS 3621:2017+A1:2024, published 26 September 2024, superseding BS 3621:2017, BS 3621:2007+A2:2012, BS 3621:2004, BS 3621:1998 and BS 3621:1980. It specifies performance requirements and test methods for a thief resistant, mechanically operated single point lock assembly (including locking plates, fixing screws, fitting instructions, cylinders and protective furniture) incorporating a lock conforming to BS EN 12209:2016, lockable from both sides by key so that only key egress is possible, for doors, window doors and entrance doors. It explicitly excludes keyless egress assemblies, which are covered by BS 8621, and secure no egress modes, covered by BS 10621. Notes that quote BS 3621 as the insurance benchmark for a front door lock should cite the 2017+A1:2024 edition, not the 2007 one. The BSI catalogue page confirms number, title, date, status and scope; the full requirements are paywalled.
- strong RN-U9PCSG cited
BSI (British Standards Institution)
STATUS: CURRENT, with no withdrawal date shown despite the 1980 date. BS 4787-1:1980 was published 30 June 1980 and specifies the metric sizes for dimensionally coordinated internal and external wood doorsets, door leaves and frames, that is the work sizes for the doorset as an assembly of fixed frame plus movable leaf with its hardware, with information on glazed openings and ancillary provisions in Appendix A, and it is written to coordinate doors with windows. This is the origin of the standard UK metric door sizes (762 x 1981 mm and its relatives) that a note quotes when telling a reader whether a replacement leaf will fit an existing lining. Note that performance, as distinct from dimensions, comes from other standards: BS EN 14351-1 for external pedestrian doorsets and BS 8214 for timber fire door assemblies. Catalogue page confirms number, title, date, status and scope; the size tables are paywalled.
Cited in How Much Paint Do I Need?.
- strong RN-C3NSSX cited
BSI (British Standards Institution)
The code of practice behind every balustrade, balcony, landing and decking guard rail, and the standard Approved Document K points to for barrier loadings. Paywalled, so only the BSI catalogue page is public; it confirms the current edition is BS 6180:2011, published 31 March 2011, status Current but Under Review, from BSI committee B/208 and ICS 91.060.99. The catalogue page confirms it is a full revision of the 1999 edition and that the two substantive changes were the inclusion of Table 2, minimum horizontal imposed loads for parapets, barriers and balustrades, and changed rules on deflection at clause 6.4.1, so a note needing barrier load figures should cite Table 2 by name. It covers design, structure, height and strength of barriers in aluminium and copper alloys, concrete, plastic, steel, stone, wood and glass, temporary and permanent, including protective, crash and crush barriers and those imposing a speed limit up to 16 km/h. It expressly does NOT apply to spectator sports areas or buildings, construction sites, or barriers protecting children younger than 24 months.
Cited in Newel Posts, Spindles & Balustrades.
- strong RN-OPTOJC cited
BSI (British Standards Institution)
STATUS: CURRENT. BS EN 12600:2002 was published 9 January 2003 and is the pendulum impact test that classifies flat glass products into three principal classes by performance under impact and by mode of breakage, the classification that Approved Document K uses for critical locations in glazing. The class code is a three part designation of the form Class 1(B)1 or 2(B)2, where the first figure is the drop height passed, the letter the mode of breakage and the last figure the highest class achieved. The stated purpose is increasing personal safety by reducing cutting and piercing injuries and by assessing containment. It does not cover application requirements or durability, and it superseded the old British test BS 6206:1981, which used classes A, B and C, so a note quoting BS 6206 class A glass is quoting a superseded classification. Catalogue page confirms number, title, date, status and scope; the test detail is paywalled.
Cited in Rooflights & Skylights: Materials & Types, Sliding Patio Doors vs Bifolds, Windows and Doors: The Complete UK Guide (2026).
- strong RN-BI7QQG cited
BSI (British Standards Institution)
STATUS: CURRENT. BS EN ISO 12543-2:2021 was published 28 February 2022 and is identical to ISO 12543-2 and EN ISO 12543-2; it supersedes BS EN ISO 12543-2:2011. It sets the performance requirements for laminated safety glass as defined in ISO 12543-1, covering impact behaviour, durability against humidity, high temperature and solar radiation, fire performance, appearance and dimensional specification. This is the part to cite for laminated safety glass, which matters for rooflights and overhead glazing where laminate is required so that a broken pane is retained by the interlayer rather than falling; toughened glass to BS EN 12150-1 fragments instead. The series has six parts: -1 definitions and component parts, -2 laminated safety glass, -3 laminated glass, -4 test methods for durability, -5 dimensions and edge finishing, -6 appearance. Catalogue page confirms number, title, date, status and scope; the requirements are paywalled.
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BSI Knowledge
Published 31 October 2018 and current. This is the code of practice Approved Document K leans on for safety glazing. It gives safety recommendations for glass and plastics glazing sheet materials in locations likely to be subject to accidental human impact, covering both vertical and sloping overhead glazing, with the stated aim of reducing impact related injuries and in particular the risk of cutting and piercing injuries. It carries the guidance on general safety considerations, design considerations, impact performance, marking of safety glazing, critical locations, permanent screen protection, manifestation and specialist glazing products. It excludes glazing for furniture and fittings and for commercial and domestic greenhouses. Cite it for why glass below 800 mm in a window, or below 1500 mm in or beside a door, has to be toughened or laminated and permanently marked.
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BSI Knowledge
Published 30 April 2023 in this A1:2021 version and current. It sets the safety requirements and test methods for power operated industrial, commercial and garage doors, gates and barriers intended for installation in areas within reach of people, including vertically moving commercial doors such as rolling shutters and rolling grilles. It addresses all significant hazards, hazardous situations and events relevant to power operation both in intended use and under reasonably foreseeable misuse, which is the standard behind force limitation, safety edges and photocell requirements on an automated garage door or driveway gate. Cite this alongside BS EN 13241 whenever a note discusses an electric garage door or an automated gate, since the two do different jobs: 13241 declares performance, 12453 makes it safe to stand near.
Cited in Garden Gate Installation Cost: 2026 UK Price Guide.
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BSI Knowledge
The current version of PAS 24, published 30 September 2024, superseding PAS 24:2022. It specifies test methods and acceptance criteria for doorsets and windows intended to resist the attacks associated with a casual or opportunistic burglar, covering hinged, sliding, pivot and folding windows and single and double leaf hinged, sliding, pivot and folding doorsets. The A1:2024 amendment was made to keep pace with the changing modus operandi of criminals and to update referenced industry documents. It tests the manufactured product before installation and does not specify materials or installation methods. PAS 24 is the specification behind Approved Document Q in England and Wales, appears at clause 4.13 of the Scottish building standards, and certification to it is one route to meeting the police Secured by Design scheme.
Cited in Door Screen Cost: 2026 UK Price Guide, Windows and Doors: The Complete UK Guide (2026).
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Certass Limited
The Certass explanation of the boundary of a glazing competent person scheme, which decides whether a homeowner should expect a compliance certificate at all. Registrable work is the replacement of a complete window or door unit, frame and glazing, within the thermal envelope of an existing dwelling. Not registrable: porches and conservatories, installations outside the thermal envelope such as garages and sheds, enlarged openings, new builds and certain extensions, repairs to existing windows, and commercial or local authority housing. The key distinction for a repair note is stated plainly: replacing just the glazing unit or the locking mechanism is a repair and cannot be registered, so only a full frame replacement generates a certificate. Work outside the scheme must go to building control instead. Useful for explaining why a misted unit swap or a lock change produces no FENSA or Certass certificate, and why that is correct rather than a sign of a rogue trader.
Cited in Glazed Extensions: The Complete UK Guide, Replacing Misted Double Glazing Units Cost: 2026 UK Price Guide.
- strong RN-F8DIKQ cited
Secured by Design (UK Police Service)
The police list of security standards accepted for residential doorsets under Police Preferred Specification. It names PAS 24:2022+A1:2024 as the newest accepted version, with PAS 24:2022 still accepted and PAS 24:2016 accepted only until 31 December 2025, so a door certified to the 2016 version is no longer current. Other accepted routes are STS 201 Issue 14:2021, STS 202 Issue 10:2021 and STS 222 Issue 2:2021 from Warringtonfire, and LPS 1175 Issue 8.2, LPS 1673 Issue 1 and LPS 2081 Issue 1.1 from the LPCB. Useful for dating a supplier's security claim: ask which PAS 24 version and year the certificate quotes.
- good RN-ABUR2T cited
Glass and Glazing Federation
The GGF's own comparison table, and the best single answer to whether triple glazing is worth it. Table 1 gives typical values with warm edge spacer. Double glazed 28 mm 4-20-4 with one low-E coating: centre pane 1.5 W/m2K air filled or 1.2 argon filled, g-value 0.70 to 0.71, whole window Uw 1.6 giving WER -13 (band C) for air, and Uw 1.3 giving WER +7 (band A) for argon. Triple glazed in the same PVC-U frame: 28 mm 4-8-4-8-4 argon with one low-E gives Ug 1.3, Uw 1.4, WER -9 (band B), which is worse than the argon double unit; with two low-E coatings it gives Ug 1.0, Uw 1.1, WER +2 (band A). 36 mm 4-12-4-12-4 with two low-E gives Ug 0.8, Uw 1.1, WER +22 (A++); 40 mm 4-14-4-14-4 with two low-E gives Ug 0.7, Uw 1.0, WER +29; 44 mm 4-16-4-16-4 with two low-E gives Ug 0.6, Uw 0.9, WER +36 (A++). The document states plainly that with certain double glass unit specifications the whole window U-value may be better than a basic specification triple unit, and that there is no benefit in triple glazing, subject to cavity width, unless two panes of low-E glass are used, with the coatings on surface 3 for double and surfaces 3 and 5 for triple. It also sets out the definitions: Uw whole window to BS EN ISO 10077 parts 1 and 2, Ug centre pane to BS EN 673, g-value to BS EN 410, and notes DSER counts the g-value only where glazing exceeds 60 per cent of the door.
Cited in Glazed Extensions: The Complete UK Guide, Windows and Doors: The Complete UK Guide (2026).
- supplier figure RN-KLAX7C cited
JJ Roofing Supplies
the retail price JJ Roofing Supplies publishes for Velux GGL Centre Pivot Pine Roof Window, which is the supply figure the cost book records for this item
- supplier figure RN-OKSPSY cited
Lawsons (Whetstone) Ltd
the retail price Lawsons (Whetstone) Ltd publishes for Exterior Door Blank FD30 Unlipped - Various Sizes, which is the supply figure the cost book records for this item
- supplier figure RN-RGP2CB cited
Lawsons (Whetstone) Ltd
the retail price Lawsons (Whetstone) Ltd publishes for Ply Flush Internal Doors, which is the supply figure the cost book records for this item
- supplier figure RN-5NZ1EQ cited
Screwfix
the retail price Screwfix publishes for 1 2 x 15mm white chrome angled l s modern thermostatic radiator valve lockshield, which is the supply figure the cost book records for this item
Cited in How to Restore Radiator, Radiator Valves: TRVs, Lockshields & Smart.
- supplier figure RN-4CKMW0 cited
Screwfix Direct Ltd
the retail price Screwfix Direct Ltd publishes for smith locke series 3 fire rated overhead door closer silver, which is the supply figure the cost book records for this item
Cited in Fire Doors Explained: FD30 vs FD60 & Where You Need Them, Plasterboard Types & Sizes Explained.
- supplier figure RN-42XJW4 cited
Secondary Glazing Specialist
Secondary Glazing Specialist publishing its own price guidance for this work. A trade supplier writing about what it charges is evidence of the market rate and not a quotation, and the cost book treats it as one figure among several rather than on its own
Cited in Grey Coloured Upvc Windows Cost: 2026 UK Price Guide, Sash Windows: Repair, Replace & Cost, Windows and Doors: The Complete UK Guide (2026).
- supplier figure RN-8NZSKF cited
Shutters Design
Shutters Design publishing its own price guidance for this work. A trade supplier writing about what it charges is evidence of the market rate and not a quotation, and the cost book treats it as one figure among several rather than on its own
Cited in Blinds vs Curtains vs Shutters, Plantation Shutters: Cost & Types.
- supplier figure RN-7QN5GL cited
Skylight Factory
the retail price Skylight Factory publishes for 1000 x 1500 mm Korniche Style #2 Aluminium Roof Lantern, which is the supply figure the cost book records for this item. Re-sourced from a category listing so the page a reader opens is the product that was priced
- supplier figure RN-JFQNAH cited
Wickes
the retail price Wickes publishes for Spacepro Sliding Wardrobe Door White Framed Mirror, which is the supply figure the cost book records for this item
- supplier figure RN-PHHL94 cited
Wickes Building Supplies Ltd
the retail price Wickes Building Supplies Ltd publishes for Marshalls Driveline Priora Brindle Block Paving 200 x 100 x 60mm Pack of 404, which is the supply figure the cost book records for this item
Cited in Resin Bound Driveways: Cost & Pros/Cons.
- very strong RN-JHFWQB
World Health Organization Regional Office for Europe
Published 15 October 2009, ISBN 9789289041737, the health-based benchmark for night-time noise that a soundproofing or acoustic glazing note can cite for what level of quiet is worth achieving. Using Lnight,outside as defined in the Environmental Noise Directive 2002/49/EC, it sets an Lnight,outside of 40 dB as the target of the night noise guideline to protect the public including the most vulnerable groups, named as children, the chronically ill and the elderly. It recommends an Lnight,outside of 55 dB as an interim target for countries that cannot achieve the guideline in the short term and adopt a stepwise approach. The guidelines were agreed by a working group of experts with industry, government and non-governmental stakeholders in December 2006, and extend and update the WHO Guidelines for community noise of 1999.
- very strong RN-BPHKK9
Cadw, Welsh Government
WALES, and it imposes a documentary requirement England does not. A heritage impact statement MUST be submitted with every Welsh listed building consent application alongside detailed plans. Consent is administered by local planning authorities and may be needed for relatively minor work such as replacing an external door, painting or repainting the exterior or interior, or even cleaning. Replacement of traditional windows with UPVC will not normally be acceptable. Routine or like-for-like repairs do not normally need consent, but the criteria are exacting, and demolition always needs consent. Where the authority is minded to grant consent Cadw is normally notified and assesses whether the authority had proper regard to preservation, rather than the merits. The framework is Managing Change to Listed Buildings in Wales, which supplements Planning Policy Wales and Technical Advice Note 24: The Historic Environment, alongside Cadw's Conservation Principles.
- very strong RN-R54RCK
Department for Business and Trade
Published 31 March 2026, last updated 21 August 2026, and applying to England, Scotland and Wales. States that the UK continues to recognise the CE marking alongside or in place of the UKCA marking for the Great Britain market under the Product Safety and Metrology (Amendment) Regulations 2024, so a CE marked product remains lawful to place on the GB market and manufacturers may choose either route. Sets out the UKCA and CE regimes spanning over 20 product types, and the duties of each economic operator: the manufacturer designs and marks the product, applies identification details (name, trade name or trademark and postal address) and retains the technical documentation. Northern Ireland uses CE or CE and UKNI marking instead, and the UKCA marking does not apply in Guernsey, Jersey, the Isle of Man or the British Overseas Territories.
- very strong RN-8XFMI0
Department of Finance (Northern Ireland)
The Northern Ireland index of technical booklets, which take the place of England's Approved Documents under the Building Regulations (Northern Ireland) 2012. Current editions: B materials and workmanship (July 2013), C site preparation and resistance to contaminants and moisture (October 2012), D structure (October 2012), E fire safety (October 2012), F1 conservation of fuel and power in dwellings and F2 in other buildings (both June 2022), G resistance to the passage of sound (October 2012), H stairs, ramps, guarding and protection from impact (October 2012), J solid waste (October 2012), K ventilation (October 2012), L combustion appliances and fuel storage (October 2012), M physical infrastructure for high-speed communications networks (January 2017), N drainage (October 2012), P sanitary appliances, unvented hot water storage and reducing the risk of scalding (October 2012), R access to and use of buildings (October 2012) and V glazing (October 2012). Note for any electrical note: there is no Northern Ireland technical booklet covering electrical safety, so there is no Part P equivalent and no electrical competent person self-certification regime there. Ventilation is Booklet K, drainage Booklet N and glazing Booklet V, not F, H and K as in England.
- very strong RN-78SSH6
Department of Finance (Northern Ireland)
NORTHERN IRELAND, giving a fourth set of U-values distinct from England, Wales and Scotland. Table 2.2 sets limiting area-weighted average U-values in W/m2.K with a maximum permitted at any point in brackets: wall 0.18 (0.60), floor 0.18 (0.60), roof 0.16 (0.30), party wall 0.00 (0.60), and windows, roof windows, glazed rooflights, curtain walling and pedestrian doors 1.40 (3.00). Where the space heating source is underfloor heating the maximum floor U-value tightens to 0.15. Compare Wales at 0.13 for roofs and Scotland at 0.12, against NI's 0.16. Paragraph 2.43 limits the extent of external doors and glazed openings in a dwelling to no more than 25 per cent of the dwelling's floor area, and the limiting air permeability is 10 m3 per hour per square metre at 50 Pa, looser than the Welsh 8.0. U-values are calculated to BRE Report BR 443. A swimming pool basin must achieve not more than 0.25.
- very strong RN-DWSXF9
Health and Safety Executive
The HSE leaflet a decorating or period-property note should cite on lead paint. Names the highest-risk activities as blast removal and burning of old lead paint, stripping old lead paint from doors and windows, hot cutting in demolition and dismantling, some painting of buildings, and soldering. Corrects a common misconception: lead is not absorbed through the skin, except as lead alkyls and lead naphthenate, so the routes of entry are breathing in lead dust, fume or vapour and swallowing lead by eating, drinking, smoking or nail-biting without washing hands and face first. Absorbed lead circulates in the blood and is stored mainly in the bones, where it can remain for years without symptoms. Early effects are headaches, tiredness, irritability, constipation, nausea, stomach pains, anaemia and weight loss; continued uncontrolled exposure can cause kidney damage, nerve and brain damage and infertility. Flags that an unborn child is at particular risk, especially in the early weeks before a pregnancy is known. Where exposure is significant as defined in law, the employer must supply protective clothing, launder it, measure airborne lead, supply respiratory protective equipment if the occupational exposure limit cannot be met, and arrange blood-lead medical surveillance.
- very strong RN-7FFIB1
Health and Safety Executive
HSE's guidance sheet for the window cleaning trade, the source behind the questions a homeowner should ask before hiring one. It applies the Work at Height Regulations 2005 hierarchy: avoid work at height where reasonably practicable, for example by using telescopic water fed poles or cleaning from inside; then use an existing safe place of work such as an inside sill or balcony; then minimise the consequences of a fall. It names the joint HSE and Federation of Window Cleaners best practice guidance 'Window Cleaning with Water Fed Poles: How to do it and look after your body'. On ladders it says a ladder should not be the automatic choice but can be the most sensible option for low risk, short duration tasks, traditionally ground, first and second floor domestic windows, that almost all falls from ladders happen because the ladder moved unexpectedly, and that the ladder should be tied to a suitable point wherever possible. The Regulations require work at height to be properly planned, supervised and carried out by competent people. Cite this for why a quote based on water fed poles is the safer and normal method above ground floor.