Bathrooms
123 sources in the library on bathrooms, 35 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 4.
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Building Control Northern Ireland
The index of Northern Ireland's Technical Booklets, the devolved equivalent of England's Approved Documents, and the place to check which NI booklet answers a question. The booklets run B materials and workmanship, C site preparation and resistance to contaminants and moisture, D structure, E fire safety, F1 conservation of fuel and power in dwellings (2022 edition) and F2 for buildings other than dwellings, G sound, H stairs ramps and guarding, J solid waste, K ventilation, L combustion appliances and fuel storage, M physical infrastructure for high speed electronic communications networks, N drainage, P sanitary appliances and unvented hot water storage, R access to and use of buildings, and V glazing. Amendment booklets AMD7 (amends B, C and E), AMD8 (amends R) and AMD9 (amends E and R) carry the live changes, so the base 2012 booklets must be read with them.
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GOV.UK
The government's own list of alterations that need building regulations approval, and the page to cite when a reader asks whether a bathroom or kitchen refit is notifiable. Works listed as needing approval include installing a bathroom that will involve plumbing, changing electrics near a bath or shower, replacing a fuse box and connected electrics, replacing windows and doors, replacing roof coverings, installing or replacing a heating system, adding radiators to an existing heating system, and installing fixed air conditioning. Emergency repairs to a boiler or heating system do not need approval in advance, though specific rules then apply. Approval may be obtained from a local authority building control department, a private registered building control approver, or, for higher-risk residential buildings, the Building Safety Regulator. The page states the practical consequence bluntly: without approval you will not have the certificates of compliance you may need when you want to sell your home. Note that a like-for-like bathroom refit with no new plumbing, no drainage change and no work in the electrical zones is not on the list.
Cited in Replace Shower Pan Cost: 2026 UK Price Guide, Replacing Windows: Process, FENSA & Cost.
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Health and Safety Executive
HSE's guidance note behind every slip-resistance figure a flooring or paving note quotes, and the source that separates the two tests people conflate. Table 1 classifies slip potential from pendulum test values (PTV): 0 to 24 high, 25 to 35 moderate, 36 and above low. Table 2 gives the parallel Rz microroughness classification. It describes the HSL/UKSRG ramp CoF test, then deals with the German ramp tests separately: DIN 51097 uses barefoot operators with a soap solution and DIN 51130 uses heavily cleated EN ISO 20345 safety boots with motor oil, and HSE states it has reservations about both because neither uses contaminants representative of real workplaces and the way results are reported is a cause for concern. Table 3 sets the DIN 51130 R scale by slip angle: R9 6 to 10 degrees, R10 10 to 19, R11 19 to 27, R12 27 to 35, R13 above 35. It warns that R9 and sometimes R10 surfaces will be slippery when wet and that a single class covers a wide CoF range, R10 alone spanning 0.18 to 0.34, so an R number is not a substitute for a PTV. Note that BS 7976-2, the pendulum method, was withdrawn in February 2022, which makes this HSE page the right citation for the thresholds.
Cited in Bathroom Tiles: Types, Cost & Layout, Best Flooring for Kitchens, Bathrooms & Living Rooms, Patio Cost & Materials: Paving, Porcelain & Stone, Resin Floor Cost: 2026 UK Price Guide and 1 more.
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Health and Safety Executive
HSE guidance aimed squarely at worktop installers. It states that respirable crystalline silica is present in most rocks, sands and clays and in products such as bricks, tiles and concrete, and that breathing stone dust containing RCS causes silicosis, lung cancer and chronic obstructive pulmonary disease. The controls it names are water suppression, or on-tool extraction with a shroud and dust collector attached to an M-class vacuum, and it warns against dry sweeping dust and debris or anything else that makes dust go airborne. For respiratory protection it specifies a face mask such as an FFP3 with an assigned protection factor of at least 20, meaning it reduces the dust inhaled by a factor of 20. Cite it when a note tells a reader what to ask a worktop fitter about site cutting.
Cited in Kitchen Worktops Compared: Quartz, Granite, Laminate.
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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 2026 edition of Approved Document F Volume 1, supporting Requirement F1 and regulations 39, 40C, 42 and 44. It takes effect on 24 March 2027 in England for building work not connected with higher-risk building work, and on 24 September 2027 for work in connection with higher-risk building work, with transitional arrangements in Circular Letter 01/2026. The extract rates are unchanged from the 2021 edition: paragraph 1.13 requires extract to outside in kitchens, utility rooms, bathrooms and sanitary accommodation, and Table 1.1 keeps 30 l/s for a kitchen with a cooker hood extracting outside, 60 l/s where there is no hood or the hood does not extract outside, and 30 l/s for a utility room. Paragraph 1.16 keeps extract terminals within 400 mm of the ceiling and 1.17 keeps the cooker hood 650 to 750 mm above the hob. Paragraph 1.11 states background ventilator sizes are given as an equivalent area in mm2, not free area, measured to BS EN 13141-1, and 1.12 requires that equivalent area to be marked visibly from inside.
Cited in Trickle Vents & Background Ventilation.
- very strong RN-YAW64M cited
Ministry of Housing, Communities and Local Government
Requirement G3(4) states the hot water supply to any fixed bath must be designed so the water delivered to that bath cannot exceed 48 degrees C; paragraph 3.65 says this is achieved with an in-line blending valve or other temperature control device with a maximum temperature stop, and 3.66 accepts valves to BS EN 1111:1999 or BS EN 1287:1999 that fail safe. G3(3) requires unvented storage vessels to prevent stored water exceeding 100 degrees C and to convey safety discharge somewhere visible and safe. Regulation 36 and Requirement G2 cap potential consumption in a new dwelling at 125 litres per person per day, or the optional 110 litres per person per day where a planning condition specifies it; G2 applies only to dwellings erected or formed by material change of use. Sections G4 sanitary conveniences, G5 bathrooms and G6 food preparation areas set scale of provision.
Cited in Boiler Replacement & Central Heating Costs (UK), Reseal Bath Cost: 2026 UK Price Guide.
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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
Paragraph 1645 of the M4(2) guidance requires a minimum 1,200 mm clear space in front of and between all kitchen units and appliances in living, kitchen and eating areas. Wall switches, socket outlets, stopcocks and controls must have their centre line between 450 mm and 1,200 mm above floor level (Diagram 1.5), consumer units are mounted with switches 1,350 to 1,450 mm above floor level, and boiler timer controls and thermostats between 900 mm and 1,200 mm. Communal approach routes and flights need a minimum clear width of 1,200 mm and every landing a minimum 1,200 mm clear of any door swing. Handrail guidance is measured 450 mm above the pitch line of the treads.
Cited in Bathroom Layouts & Planning, Bathroom Storage Solutions, Bathroom Tiles: Types, Cost & Layout, Choosing Paint Colours: A Practical Guide and 12 more.
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Ministry of Housing, Communities and Local Government
The document that decides what electrical work a homeowner may legally do themselves, and the exact list of notifiable jobs. Regulation 12(6A), reproduced at paragraph 2.5, makes only three things notifiable: the installation of a new circuit, the replacement of a consumer unit, and any addition or alteration to existing circuits in a special location. Regulation 12(9) defines special location as, in a room containing a bath or shower, the zone extending vertically from finished floor level to 2.25 metres (or the shower head position if higher) and horizontally 600mm from the edge of the bath tub or shower tray. Paragraph 2.7 states that all other electrical installation work is not notifiable, namely additions and alterations to existing installations outside special locations, and replacements, repairs and maintenance anywhere. Paragraph 2.8 gives worked examples: a built-in cooker is not notifiable unless a new cooker circuit is needed, and connecting an electric gate or garage door to an existing isolator is not notifiable but running a new circuit from the consumer unit to that isolator is. Paragraph 2.2 confirms Part P reaches outdoor work including fixed garden lighting, pond pumps and outbuildings such as sheds, detached garages and domestic greenhouses. Notifiable work must be certified by self-certification by a registered competent person, third-party certification, or a building control body (paragraph 3.1), with the compliance certificate issued within 30 days (paragraph 3.4). Note that Approved Document P is a source of guidance rather than a ban: non-notifiable work still has to comply with BS 7671.
Cited in Adding an Ensuite: Cost, Layout & Plumbing, Adding Plug Socket Room Cost: 2026 UK Price Guide, Annexe & Granny Flat: Cost, Planning & Rules, Bathroom Layouts & Planning and 76 more.
- very strong RN-HL3VRN cited
Ministry of Housing, Communities and Local Government
The landing page for Part H of the Building Regulations in England, and the citation for which edition governed a drainage alteration. It hosts the 2015 edition, 1.23 MB, with the guidance first published to GOV.UK on 4 December 2010 and earlier editions held at the National Archives. The stated scope of the current edition is foul water drainage both above and below ground, pipe sizes, protection of pipes, and manholes and inspection chambers, which are the parts of Part H that bite whenever a bathroom or kitchen is moved rather than replaced in place. The full requirement set runs H1 foul water drainage, H2 wastewater treatment systems and cesspools, H3 rainwater drainage, H4 building over sewers, H5 separate systems of drainage and H6 solid waste storage, so a project that touches a shared or public sewer engages H4 and a build-over agreement as well as the pipe sizing in H1. The trap seal depths, minimum branch diameters, branch lengths and gradients themselves are inside the linked PDF.
Cited in How to Fit a Bathroom Suite.
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The National Archives (legislation.gov.uk)
Section 2(2) lists the building owner's rights over a party structure: (a) underpin, thicken or raise; (b) make good, repair or rebuild a defective party structure; (c) to (e) demolish and rebuild non-conforming partitions, connected buildings and party structures of insufficient strength or height; (f) to cut into a party structure for any purpose, which may include inserting a damp proof course; (g) to cut away a footing, projecting chimney breast, jamb, flue or other projection to enable a wall to be built; (h) to cut away overhanging parts of an adjoining building; (j) insert flashings; (k) execute incidental works; (l) raise or rebuild a party fence wall; (m) reduce wall heights; (n) expose a previously enclosed party wall. Paragraph (f) is the one that catches chasing or breaking through a shared wall for pipework, which makes it party wall work requiring a party structure notice.
Cited in Moving Bathroom Upstairs Cost: 2026 UK Price Guide.
- very strong RN-HUA3K9 cited
The National Archives (legislation.gov.uk)
Lists the building work that is not notifiable. Paragraph 1(j) is the sanitary one: replacing a sanitary convenience with one that uses no more water than the one it replaces, a washbasin, sink or bidet, a fixed bath, a shower, a rainwater gutter or a rainwater downpipe, in each case where the work does not include any work to underground drainage. Installing a new WC, as opposed to replacing one, therefore stays notifiable, and so does any replacement that touches underground drainage or uses more water. The Schedule also covers replacement of non-structural windows in certain circumstances and various electrical and heating replacements, all subject to the work not prejudicing health or safety.
Cited in Install A Macerating Toilet Cost: 2026 UK Price Guide.
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The National Archives (legislation.gov.uk)
The paragraph that fixes toilet flush volumes in England, Wales and Northern Ireland, and the one people misquote. Every WC pan must be supplied with water from a flushing cistern, a pressure flushing cistern or a pressure flushing valve, and must clear its contents effectively with a single flush. No flushing device installed for use with a WC pan may give a single flush of more than 6 litres, with a transitional allowance of 7.5 litres that ran only until 1 January 2001, and a separate transitional route for replacing a cistern installed before 1 July 1999. Where a device can deliver more than one flush volume, the smaller flush must not be less than two thirds of the largest, which is why a genuine dual flush is 6 and 4 litres rather than 6 and 3. Flushing cisterns must be clearly marked with their flush volume, and a device offering variable volumes must carry visible instructions for its operation. A pressure flushing valve must be fitted with a backflow prevention device positioned at least 300 mm above the spillover level of the pan.
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The National Archives (legislation.gov.uk), UK Statutory Instrument 1999/1148
The exact list of plumbing work that must be notified to the water undertaker, with its consent obtained, before it begins. Regulation 5(1) requires notice, consent not to be unreasonably withheld, and compliance with any conditions. The Table item 4 covers installing: (a) a bath over 230 litres measured to the centre line of overflow; (b) a bidet with ascending spray or flexible hose; (c) a single shower unit of a type specified by the regulator connected directly or indirectly to a supply pipe; (d) a pump or booster drawing more than 12 litres per minute connected directly or indirectly to a supply pipe; (e) reverse osmosis; (f) a water treatment unit producing waste water; (g) an RPZ valve or other device for fluid category 4 or 5; (h) a garden watering system not operated by hand; (i) any water system laid outside a building less than 750mm or more than 1350mm below ground. Item 5 covers construction of a pond or swimming pool over 10,000 litres designed to be replenished by automatic means from a water undertaker's supply. Regulation 5(2) exempts approved contractors for items 2, 4(b) and 4(g).
Cited in Pond Fibreglassing Cost: 2026 UK Price Guide, Rain Shower Price Cost: 2026 UK Price Guide.
- very strong RN-4MRYEN cited
The National Archives (legislation.gov.uk), UK Statutory Instrument 1999/1148
The substantive requirements every water fitting in England, Wales and Northern Ireland must meet, and the source of several hard numbers. Paragraph 25(d) caps a single flush from a WC flushing device at 6 litres (7.5 litres under the transitional wording at paragraph 25 as originally applied). Paragraph 17 requires safety devices on every unvented water heater other than an instantaneous heater of 15 litres capacity or less, and on every secondary coil in a primary system. Paragraph 23(1) requires a temperature relief valve or combined temperature and pressure relief valve on every unvented hot water storage vessel with a capacity greater than 15 litres. Paragraph 5 requires every fitting to withstand an internal pressure of not less than 1.5 times its maximum design pressure. Water efficiency limits are also fixed here: 27 litres per kilogram of washload for domestic horizontal axis washing machines on a standard 60 degrees C cotton cycle, 48 litres per kilogram for washer driers, and 4.5 litres per place setting for domestic dishwashers.
Cited in Outdoor Kitchens: Cost & Planning.
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Welsh Government (gov.wales)
WALES. First published 3 April 2017, last updated 7 April 2026. Wales publishes its own Approved Document F, and the page carries the current volume 1 for dwellings (910 KB PDF) and volume 2 for buildings other than dwellings, plus replacement volumes that TAKE EFFECT ON 4 MARCH 2027, the same changeover date as the Welsh Approved Document L and distinct from England's 24 March 2027. Welsh Part F diverged from England's when England issued its 2021 edition alongside Part L and Part O, so extract rates and background ventilator provisions for a Welsh bathroom, kitchen or loft conversion should be taken from this document rather than from England's Approved Document F.
Cited in Trickle Vents & Background Ventilation.
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BSI
The current edition of the UK waterproofing code, published 31 March 2022, superseding BS 8102:2009. It gives recommendations and guidance on dealing with and preventing the entry of water from external sources into structures partly or wholly below ground, and it recognises three types of protection which a specification must name: Type A waterproofing barrier materials applied to the structure, Type B structurally integral watertight construction, and Type C drained cavity construction. It requires the waterproofing strategy to be set at the earliest planning and design stage, covering structural design, overall weatherproofing design, waterproofing design, construction sequencing and buildability, and it treats external drainage and openings as part of the strategy rather than as details. It also sets out evaluation of groundwater conditions, consideration of harmful ground gases, and the risk assessment that drives the choice of grade. Descriptors include basements, tanking, vapour barriers, render, ground-water drainage and site investigations. This is the standard to cite for a basement shower room or a below-ground floor build-up.
Cited in Basement & Cellar Conversions: Cost, Basement Conversion Cost & Feasibility (UK), Cellar Tanking & Waterproofing, Damp Proofing: Methods, Costs & When You Need It and 2 more.
- strong RN-TL1I4R cited
BSI
BS EN 12004-1:2017, published 28 February 2017, committee B/539, prepared by CEN/TC 67 Ceramic tiles, current; it supersedes BS EN 12004:2007+A1:2012. The scope covers three types of ceramic tile adhesive: cementitious for internal and external installations, and dispersion and reaction resin for internal installations only, on walls and floors. It gives the terminology for the products, working methods and application properties, specifies the performance requirements and the appurtenant test methods, the assessment and verification of constancy of performance, and the classification, designation and marking of tile adhesives, which is where the C, D and R type letters and class numbers on a bag of adhesive come from. It expressly does not provide criteria or recommendations for the design and installation of ceramic tiles, which is BS 5385. It notes tile adhesives may also be used for natural and agglomerated stones if they do not adversely affect the material. BS EN 12004-2:2017 gives the test methods.
Cited in Bathroom Tiles: Types, Cost & Layout, Grab Adhesive & Construction Adhesives, How to Tile a Wall or Floor, Wet Room Tanking & Waterproofing.
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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-V6RE0V cited
BSI (British Standards Institution)
STATUS: CURRENT, and it is the renumbered successor to the BS EN 61558 series that the notes cite. BS EN IEC 61558-2-5:2025 was published 31 March 2025, is identical to EN IEC 61558-2-5:2023 and IEC 61558-2-5:2024, sits under ICS 29.180 and committee PEL/96. Its predecessor BS EN 61558-2-5:2010 (published 30 September 2010) is still shown as current on its own catalogue page and covers stationary, single phase, air cooled dry type shaver transformers with encapsulated or non encapsulated windings at internal frequencies up to 500 Hz, including those with electronic circuits and linear power supply units. Practical point for bathroom notes: a shaver socket in a bathroom must contain an isolating transformer to this standard, which is why it is the only socket outlet permitted in zone 2 under BS 7671; the numbering has moved from BS EN 61558 to BS EN IEC 61558, so a note citing plain BS EN 61558-2-5 should be updated. Catalogue pages confirm numbers, titles, dates, status and scope; requirements are paywalled.
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BSI Knowledge
Published 15 September 2000 and current. This is the standard behind soil and waste pipe sizing and layout inside a house, and the document that replaced the withdrawn BS 5572 code of practice for sanitary pipework on the same date. It applies to wastewater drainage systems operating under gravity in dwellings and in commercial, institutional and industrial buildings, and sets out the principles to be followed for both layout and calculation of sanitary pipework, with only limited provisions for trade effluent and pumped fluids. It sits alongside BS EN 12056-1 for general and performance requirements, -3 for roof drainage, -4 for wastewater lifting plants and -5 for installation, testing and maintenance. Cite it, with Approved Document H, when a note gives soil stack or branch waste pipe diameters, trap seal depths or branch gradients.
Cited in Install A Macerating Toilet Cost: 2026 UK Price Guide.
- strong RN-YWX7VM cited
BSI Knowledge
BSI catalogue page for BS EN 14411:2016, published 31 July 2016, status Current, Under Review; supersedes BS EN 14411:2012, which is Withdrawn. The standard defines terms and specifies characteristics for ceramic tiles including mosaics (any piece fitting into a 49 cm2 square) produced by extrusion or dry pressing, for internal and external floors including stairs and for walls. It classifies tiles into groups by two parameters: forming method, group A extruded and group B dry-pressed, and water absorption level, which is where the BIa to BIII designations on a porcelain or ceramic tile data sheet come from. It sets the level of requirements for those characteristics, references the test methods, and covers assessment and verification of constancy of performance, designation and marking. It expressly does not apply to mesh-backed products, ceramic trims and accessories, tiles made by processes other than extrusion or dry pressing, dry-pressed unglazed tiles with water absorption above 10 per cent, external road finishes, or ceiling finishes. 2016 changes include a new Clause 6 on AVCP and the exclusion of decorative pieces and mesh-backed products.
Cited in Bathroom Tiles: Types, Cost & Layout.
- strong RN-MVR3NJ cited
WaterRegsUK (Water Regulations Advisory Scheme)
The depths and protections that decide whether a new supply or a bathroom pipe run is compliant. Below ground, a water supply pipe must be laid not less than 750 mm deep and no greater than 1350 mm deep, to limit both freezing and mechanical damage; where a shallower run is unavoidable it needs the local water undertaker's consent and must be as deep as possible with added protection against warming, freezing and mechanical damage. Pipes and fittings must be suitable for below ground use, joints kept to a minimum, and the pipe embedded in non-abrasive material. Non-metallic fittings must not be in contact with soil contaminated by diesel, heating fuel, pesticides or similar substances. Insulation, installed to manufacturer instructions and to BS 5422 or BS EN ISO 12241, may delay but will not prevent freezing, so depth and routing do the real work. Above ground, pipework must remain accessible for maintenance and replacement, and concealed joints should be used only where unavoidable because they lose integrity over time. The page names Schedule 2 paragraph 7 for pipework and paragraphs 8, 9, 11, 12, 13 and 14 for system design and installation.
Cited in Outdoor Shower Cost: 2026 UK Price Guide.
- good RN-YL820L cited
The Tile Association (TTA)
The tiling trade's own list of the standards a specification should name, and the fastest way to check whether a quotation cites the right one. Design and installation: BS 5385-1 internal wall tiling in normal conditions, BS 5385-2 external wall tiling, BS 5385-3 internal and external ceramic and mosaic, natural stone and terrazzo flooring and internal agglomerated stone flooring, BS 5385-4 tiling in special conditions. Waterproofing and grout: BS EN 14891 liquid-applied water impermeable products for use beneath ceramic tiling bonded with adhesives, which is the wet room tanking standard, and BS EN 13888 grout for tiles. Slip resistance: BS 7932 determination of the unpolished and polished pendulum test value of surfacing units. Base preparation: BS 8000-9 cementitious levelling screeds and wearing screeds, BS 8000-8 plasterboard partitions and dry linings, BS 8000-16 sealing joints using sealants. Tile specification: BS EN 14411 ceramic tiles definitions and classification, and the BS EN ISO 10545 series parts 1 to 16 of test methods. Natural stone and terrazzo: BS EN 12057 modular tiles, BS EN 13748-1 and -2 terrazzo tiles for internal and external use, BS EN 14157 determination of abrasion resistance. Accessibility: BS 8300.
- supplier figure RN-QSHROZ cited
Boiler Central
Boiler Central 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 LED Strip Lighting: Uses & Installation.
- supplier figure RN-B3Z3CL cited
Screwfix
the retail price Screwfix publishes for essentials economy pipe insulation 15mm x 13mm x 1m, which is the supply figure the cost book records for this item
Cited in How to Box In Pipes & Boilers.
- supplier figure RN-MW1XMF cited
Screwfix
the retail price Screwfix publishes for Mira Flight Low Corner Waste Square Shower Tray White 800mm x 800mm x 40mm, which is the supply figure the cost book records for this item
Cited in Shower Enclosures & Trays: Sizes & Cost.
- supplier figure RN-5OKG27 cited
Selco Builders Warehouse
the retail price Selco Builders Warehouse publishes for Ultraplan Renovation Screed 25kg, which is the supply figure the cost book records for this item
Cited in Floor Levelling & Subfloor Prep.
- supplier figure RN-ON7YSB cited
Toolstation
a Toolstation category listing for bathroom showers, recorded as the page a price was read from. What it lists, and at what price, changes with the range, so it evidences that a figure was seen at this merchant rather than a price a reader can confirm today
Cited in Bathroom Remodel Cost: 2026 UK Price Guide, Rain Shower Price Cost: 2026 UK Price Guide, Showers Explained: Electric, Mixer & Power.
- supplier figure RN-GKXYX2 cited
Toolstation
the retail price Toolstation publishes for ebb flo thermoset soft close toilet seat, 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
Cited in How to Fit Toilet Seat.
- supplier figure RN-9TSJ2I cited
Toolstation
the retail price Toolstation publishes for the Ideal Standard i.life S compact wall hung toilet and soft close seat, which is the supply figure the cost book records for this item
Cited in Toilets Explained: Close-Coupled, Wall-Hung & Rimless.
- supplier figure RN-6RI6T9 cited
Toolstation
the retail price Toolstation publishes for nuie l shaped shower bath with panel and leg set, 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
Cited in Baths Compared: Freestanding, Inset & Shower Baths.
- supplier figure RN-Z4F0GS cited
Toolstation
the retail price Toolstation publishes for nuie vault single door compact wall hung vanity unit with ceramic basin 400mm, 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
Cited in Basins & Vanity Units: A Buyer's Guide, Creating a Downstairs Toilet: Cost & Rules.
- supplier figure RN-H28VAE cited
Wickes
the retail price Wickes publishes for Linear 30mm Wetroom Shower Tray with Centre Drain Level Access 1200 X 900mm, which is the supply figure the cost book records for this item
Cited in Adding an Ensuite: Cost, Layout & Plumbing, Replace Shower Pan Cost: 2026 UK Price Guide.
- very strong RN-Y4IPA0
Department of Finance (Northern Ireland)
Northern Ireland's accessibility rules for a dwelling's sanitary provision, October 2012. Section 10 requires a water closet in the entrance storey, or the principal storey, reachable from the habitable rooms of that storey without negotiating a stair; where a bathroom exists on that storey the WC may sit inside it. Paragraph 10.2 requires a clear space of not less than 900 mm by 750 mm at the WC for a person with a disability, and allows the washbasin to project into that space provided it does not impede access; frontal access centres the space on the pan, oblique access offsets it towards the approach. Paragraph 10.4 requires the doorway to be positioned so a wheelchair user can reach the clear space and, for oblique access, that the door edge is not in front of or 250 mm behind the WC unless there is room to manoeuvre. Paragraph 10.5 requires the door to open outwards or not to impinge on the clear space at any point of its swing. Table 10.1 sets clear opening widths against circulation route width: 750 mm head on from a 900 mm route, 750 mm not head on from 1200 mm, 775 mm not head on from 1050 mm, 800 mm not head on from 900 mm. Section 11 covers socket outlet and switch heights.
- very strong RN-2NGAWX
Department of Finance and Personnel, Northern Ireland (Building Control NI)
Northern Ireland's equivalent of Approved Document G, issued under the Building Regulations (Northern Ireland) 2012 and the source to cite for a reader in NI. Regulation 85(1) requires a dwelling to have at least one water closet, one washbasin and one fixed bath or shower. Regulation 86(2) requires every washbasin, bath and shower to have a piped supply of hot and cold water. Regulation 87(2) requires the hot water supply to any fixed bath to be designed and installed so the temperature delivered to that bath does not exceed 48 degrees C, the same scalding limit as England and Wales. Regulation 88 governs unvented hot water storage systems, and the guidance splits them at 500 litres storage and 45 kW: Section 2 covers systems up to 500 litres and 45 kW, then systems over those thresholds, with a separate part on discharge pipes from tundishes.
- very strong RN-S4JZCY
Department of Finance, Northern Ireland (Building Control NI)
Northern Ireland's ventilation guidance, the devolved counterpart to Approved Document F, and a clean source for extract rates because its Table 2.1 sets them out room by room. Intermittent extract minimum rates: kitchen 30 litres per second adjacent to the hob or 60 litres per second elsewhere, utility room 30 litres per second, bathroom 15 litres per second, sanitary accommodation 6 litres per second. Continuous extract minimum high rates: kitchen 13 litres per second, utility room 8, bathroom 8, sanitary accommodation 6. The whole-dwelling ventilation rate should not be less than 0.3 litres per second per square metre of internal floor area, and where a greater level of occupancy is expected an extra 4 litres per second per occupant should be added. It describes System 1, background ventilators with intermittent extract fans, as the common domestic strategy. The 30 versus 60 litres per second split is the figure that decides whether a cooker hood can sit above the hob or must be sized up when placed away from it, for example over an island.
- 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-2PCYXZ
Drinking Water Inspectorate
The regulator's account of lead pipework, useful for any period-property or plumbing note. States that before 1970 lead pipework was commonly used to connect properties to the mains, that its use has since been banned, and that a home built before 1970 may have lead pipes while one built after 1970 is unlikely to. Gives a homeowner identification test at the internal stop tap: unpainted lead appears dull grey, often with a swollen joint next to the tap, and is soft enough that a gentle scrape with a coin shows shiny silver metal beneath, with disposable gloves worn and dust not inhaled; contrasts copper as bright, hard and dull brown, iron as dark, very hard and possibly rusty, and plastic as typically blue, or grey or black if older. Explains that lead dissolves while water stands in the pipe, with concentration depending on standing time, pipe condition, temperature (more dissolves in summer and autumn) and water hardness, since harder water forms a protective scale. Notes that water companies dose with orthophosphate where a risk exists, and that a less common cause is the illegal use of lead-based solder on copper pipe, lead solder remaining permitted only in closed central heating systems. Warns lead accumulates in the body, with infants including unborn babies and children most at risk of effects on mental development, and adults at risk of kidney, heart and circulatory harm.