References

Bathrooms

177 sources in the library on bathrooms. 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 4 of 5.

1. very strong RN-4GP4LZ

   UK Government (legislation.gov.uk)

   The five fluid categories that decide what backflow protection a fitting needs. Category 1 is wholesome water supplied by a water undertaker meeting Water Industry Act 1991 requirements, no health hazard. Category 2 is water of impaired aesthetic quality through a change in temperature or a substance affecting taste, odour or appearance, for example water in a hot water distribution system. Category 3 is a slight health hazard from low toxicity substances, naming ethylene glycol, copper sulphate solution and sodium hypochlorite (common disinfectants). Category 4 is a significant health hazard from toxic substances including chemical, carcinogenic substances or pesticides, or environmental organisms of potential health significance. Category 5 is a serious health hazard from pathogenic organisms or highly toxic substances, naming faecal material or other human waste, butchery or other animal waste, and pathogens from any other source. This is the table to cite for why an outside tap, a bidet or a garden irrigation feed needs a double check valve or an air gap.

   Name this source
2. very strong RN-L7ESTP

   Welsh Government

   The Welsh route to funded adaptations, which differs from England in having a second scheme alongside the Disabled Facilities Grant. A Welsh applicant can apply for support from one or more of the ENABLE support for living independently scheme and the Disabled Facilities Grant, whereas an English applicant has the Disabled Facilities Grant alone. The listed adaptations are widening doors and installing ramps, improving access to rooms and facilities such as stair lifts or a downstairs bathroom, providing a heating system suitable for the applicant's needs, and adapting heating or lighting controls to make them easier to use. Part of the Welsh Government's Home safety, repairs and adaptation collection, with parallel guides for social housing tenants and for adapting a home before returning from hospital.

   Name this source
3. very strong RN-NTX280

   Welsh Government

   The Welsh edition of Part H, November 2023, and the source of the waste pipe sizes every bathroom and kitchen move depends on. Every point of discharge must have a trap that retains a minimum seal of 25 mm of water under working and test conditions. Table 1 sets minimum trap sizes and seal depths: washbasin and bidet 32 mm trap with 75 mm seal; bath, shower, food waste disposal unit, urinal bowl, sink, washing machine and dishwashing machine 40 mm trap with 50 mm seal, except the sink and appliance group listed at 75 mm seal; WC pan with outlet under 80 mm, 75 mm trap with 50 mm seal; WC pan with outlet over 80 mm, 100 mm trap with 50 mm seal. A basin seal may drop to 50 mm only with flush grated wastes without plugs on spray tap basins, and where an appliance discharges directly to a gully the seal may drop to not less than 38 mm. Other figures: a branch discharge pipe must not enter a stack lower than 450 mm above the invert at the foot of the stack; a branch serving one appliance should be the same diameter as its trap; branch pipes of 75 mm or more joining a stack of equal diameter need a 50 mm radius sweep, smaller ones 25 mm radius or 45 degrees; a boiler condensate connection needs a 75 mm condensate trap; a ventilating pipe should connect within 750 mm of the trap and be at least 32 mm where it has up to 5 bends.

   Name this source
4. very strong RN-HCKL9C

   Welsh Government

   The Welsh Part M, and the document that decides whether a downstairs WC may be removed in a renovation. Section 10 sets the objective as a WC in the entrance storey located so that no stair need be negotiated to reach it from the habitable rooms in that storey; where the entrance storey has no habitable rooms, a WC in either the entrance storey or the principal storey is reasonable. Paragraph 10.3 says requirement M4 is satisfied if a WC is provided on that basis, the door to the WC compartment opens outwards and is positioned to let a wheelchair user reach the WC with a clear opening width per Table 4, and the compartment gives clear space for wheelchair access with the washbasin positioned so it does not impede access, per Diagrams 31 and 32. It also states plainly that it will not always be practical for the wheelchair to be fully accommodated inside the compartment. Crucially, the guidance on material alterations gives the worked example: removing a WC in the entrance storey of a dwelling is a material alteration if it is the only WC in that storey and the storey contains habitable rooms, and it must not be removed or made less compliant unless another WC no less compliant is provided in that storey.

   Name this source
5. very strong RN-RKGF7G

   Welsh Government (gov.wales)

   The Welsh Approved Document G, which differs from the England version on the headline water figure and is therefore the source to cite for a Welsh reader. Regulation 36 requires the estimated consumption of wholesome water to be not more than 110 litres per person per day where a dwelling is erected, or 125 litres per person per day where a dwelling is formed by a material change of use, against England's 125 litres with 110 as an optional tighter standard. Regulation 37 requires the water efficiency calculation to be notified to the building control body, and the completed notice must state, for example, less than 110 litres per person per day using the fittings approach. G3(3) requires the hot water supply to a fixed bath to incorporate measures ensuring delivered temperature does not exceed 48 degrees C, by an in-line blending valve or other appropriate temperature control device that cannot be exceeded in operation. It cites BRE Information Paper IP14/03 Preventing hot water scalding in bathrooms: using TMVs. First published 5 April 2017, last updated 10 May 2023.

   Name this source
6. very strong RN-UQJZBJ

   Welsh Government (gov.wales)

   WALES. Published 3 April 2017 and not updated since, a 3 MB PDF to be read with the September 2013 amendment slip. This is the Welsh Part P, and it is not the same document as England's 2013 edition. Wales did not follow England in narrowing the definition of a special location, so the scope of notifiable domestic electrical work is wider in Wales. Cite this rather than the England Approved Document P for any Welsh rewire, kitchen or bathroom job.

   Name this source
7. very strong RN-MQY230

   Welsh Government (gov.wales)

   WALES, and this is a hard contradiction with England. The Welsh Approved Document P states that notifiable jobs include new circuits back to the consumer unit AND extensions to circuits in KITCHENS and special locations such as bathrooms, and that consumer unit replacements are notifiable. England's Approved Document P 2013 edition defines a special location at regulation 12(9) as only the zone around a bath tap or shower head, extending 2.25 metres vertically and 0.6 metres horizontally from a bath tub or shower tray, or 1.2 metres from a shower head where there is none, plus a room containing a swimming pool or sauna heater, so a kitchen is NOT a special location in England and extending a kitchen circuit there is not notifiable. In Wales it is. The Welsh document also confirms replacement, repair and maintenance work is generally not notifiable even in a kitchen or special location, that in large bathrooms the special location is bounded by the walls of the bathroom, and that conservatories, attached garages, detached garages and sheds are not special locations, so work there is notifiable only if it involves a new circuit.

   Name this source
8. strong RN-04DH6J

   BBA (British Board of Agrement)

   The certification body whose Agrement Certificate is what a note usually means when it says a system is approved, and the page that lists which schemes it actually runs. The BBA's certification team issues certificates for the BBA Agrement, HAPAS (Highways Authority Product Approval Services), European Technical Assessment (ETA), and the Microgeneration Certification Scheme. Alongside product certification it runs certification of people, including the BBA Approved Installer Scheme, the BBA Competent Person Scheme, the BBA Gas Membrane Approved Installer Scheme, TrustMark registration and the BBA PAS 2030 Scheme, plus a Client Managed Inspection Service. Its testing services are also available standalone and include durability, mechanical, physical and structural, weather resistance and wind serviceability, conformance and fit-for-purpose, thermal performance, and onsite testing and trials. An Agrement Certificate is the route by which a product without a harmonised European product standard, such as a tanking membrane, a multifoil or a proprietary EWI system, gets an independently assessed statement of fitness for a stated use.

   Name this source
9. strong RN-2RQT3P

   BSI

   BS 6465-1:2006+A1:2009, in effect from 31 March 2006 with Amendment 1 in 2009, prepared by Technical Committee B/503 Sanitary appliances, ISBN 978 0 580 67116 6, current. It is the code of practice for designing sanitary facilities and setting the scale of provision of sanitary and associated appliances, and it supersedes BS 6465-1:2006. It sits in a suite of four standards: Part 1 scales of provision, Part 2 space recommendations, Part 3 selection, installation and maintenance, Part 4 provision of public toilets. It traces back to CP 305-1 first published July 1952, with the third edition issued as BS 6465-1 in February 1984 and the fifth in March 2006. Use it to establish how many WCs and basins a dwelling should have.

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10. strong RN-VW6Y4Z

    BSI

    Part 4 completes the BS 6465 sanitary installations series that begins with Part 1 on scales of provision, Part 2 on space recommendations and Part 3 on selection, installation and maintenance. Published 30 November 2010, listed as current but under review. It gives recommendations and guidance for those responsible for surveying, assessing, planning, commissioning, designing, managing and using public toilets, covering the location, numbers, siting, design and management of them across the full range of users and locations, from towns and cities to rural areas, villages and transport routes and termini. It applies to new public toilet installations and to the upgrading of existing ones, while explicitly accepting that an existing facility might not be upgradable to every recommendation for physical or economic reasons, and stating that no public toilet should be closed merely for falling short of the standard. Cite it where a domestic project spills into semi-public provision, such as a converted outbuilding, holiday let or home business, where the domestic scales in Part 1 do not apply.

    Name this source
11. strong RN-SZF0CB

    BSI

    BS 8000-11:2011, published 31 January 2011, committee B/539, current. It gives recommendations on basic workmanship on building sites, both commercial and domestic, for the tasks frequently carried out in wall and floor tiling. It applies to fixing ceramic and agglomerated stone tiles, natural stone and terrazzo tiles and slabs, and mosaics to walls and floors using adhesive and mortar. It states plainly that its recommendations are not necessarily comprehensive and that a project specification might need to cover more. It signposts the rest of the family: design aspects of wall and floor tiling are in BS 5385, natural stone cladding and lining in BS 8298, and the harmonised product specifications are BS EN 12057 for natural stone tiles, BS EN 12058 for slabs, BS EN 14411 for ceramic tiles, BS EN 15285 for agglomerated stone and BS EN 12004 for adhesives, with BS EN 12440 for natural stone naming.

    Name this source
12. strong RN-QZAW59

    BSI

    The product standard for the shower hose, published 30 April 2015 and current. It specifies the dimensional, leak tightness, mechanical and hydraulic characteristics with which shower hoses should comply, together with the procedures for testing them, including the test method for flow. It applies to shower hoses of any material used for ablutionary purposes and intended for equipping and supplementing sanitary tapware for baths and showers, and only to hoses connected downstream of the obturator, that is downstream of the valve that shuts the water off. This matters for backflow: a flexible shower hose that can reach into the bath or below the spillover level turns the outlet into a fluid category 5 risk unless the tap gap or an approved device is provided, which is why the water regulations, not this standard, decide the hose length and the device. Cite BS EN 1113 for the hose's own performance, leak tightness and burst behaviour, and the WaterRegsUK backflow guidance for where the hose may reach.

    Name this source
13. strong RN-JBTUL5

    BSI

    The product standard for a domestic whirlpool bath, published 30 November 2018 as BS EN 12764:2015+A1:2018, current and under review. It specifies the characteristics of whirlpool baths with a rated voltage of not more than 250 V for single-phase appliances and 480 V for other appliances, intended for installation in indoor domestic situations and used per the manufacturer's instructions for personal hygiene. The defining assumption is the one that matters for health: such baths are tested and supplied as a complete independent unit designed to be drained down after every use, and the standard expressly excludes whirlpool baths for communal use where they are not drained down after every use, along with baths needing specific medical provisions and portable units. Electrical safety, other than use by young children and slow-moving, weak, elderly or disabled individuals, is covered by BS EN 60335-2-60 rather than here. The units may be delivered in separate parts for on-site assembly. Read it with the legionella guidance in HSG274 Part 2, because a whirlpool that is not fully drained becomes an aerosol-generating stored water system.

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14. strong RN-F2DFG9

    BSI

    BS EN 14055:2018, published 31 October 2018 by BSI Standards Limited, prepared by Technical Committee B/503 Sanitary appliances, under review. It supersedes BS EN 14055:2010+A1:2015, which is withdrawn. Clause 1 specifies design, performance characteristics and test methods for WC and urinal flushing cisterns complete with flushing mechanism, inlet valve and overflow, covering cisterns designed to be connected to drinking water installations inside buildings. It excludes automatic valveless siphon flushing cisterns for urinals, and cisterns for one-piece WCs and close-coupled suites, which are covered by EN 997. Clause 5 covers design and hydraulic and mechanical characteristics for type 1 products, and clause 6 covers the inlet valve, backflow prevention and cistern marking for type 2 products.

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15. strong RN-PPYI8S

    BSI

    BS EN 14516:2015+A1:2018, published 30 November 2018, the UK implementation of EN 14516:2015+A1:2018, prepared by Technical Committee B/503 Sanitary appliances; it supersedes BS EN 14516:2015, which is withdrawn, and is currently under review. Clause 1 specifies characteristics, test methods and procedures for evaluating conformity of baths used for domestic purposes and personal hygiene, so that a product installed and maintained to the maker's instructions meets requirements for cleanability and durability. It applies to all sizes and shapes of bath and excludes baths for use with medical provisions; domestic purposes here includes hotels, student accommodation and hospitals. Clause 5 covers cleanability and durability for type 1 products and Annex A lists the characteristics of the materials commonly used to make baths, which is the citation for acrylic versus steel versus cast iron claims.

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16. strong RN-U8W04Q

    BSI

    BS EN 14527:2016+A1:2018, published 30 November 2018, the UK implementation of EN 14527:2016+A1:2018, prepared by Technical Committee B/503 Sanitary appliances; it supersedes BS EN 14527:2016, which is withdrawn, and is under review. Clause 1 specifies characteristics, test methods and conformity evaluation procedures for shower trays used for domestic purposes, so a tray installed, used and maintained to the maker's instructions satisfies cleanability and durability when used for personal hygiene. It applies to all sizes and shapes of shower tray and excludes trays for use with medical provisions; domestic purposes includes hotels, student accommodation and hospitals. Clause 5 sets cleanability and durability characteristics for type 1 products and Annex A lists the characteristics of the materials commonly used to make shower trays, the citation for stone resin versus acrylic tray comparisons.

    Name this source
17. strong RN-NJ7RJF

    BSI

    BS EN 997:2018, published 31 October 2018, under review. Clause 1 specifies constructional and performance characteristics and test methods for close-coupled suites, one-piece WC pans and independent WC pans with an integral trap, made from glazed ceramics or stainless steel, for personal hygiene. It does not apply to squatting toilets, WC pans without an integral trap, or flushing cisterns supplied as separate appliances, which fall under BS EN 14055. For close-coupled suites and one-piece WCs it additionally specifies the design, performance and test methods of the designated flushing cistern, its flushing mechanism, inlet valve and overflow. It notes that before installing WCs, EN 12056-2 and national requirements apply. This is the standard behind flush-volume, flush-performance and pan-material claims.

    Name this source
18. strong RN-KQW44R

    BSI (British Standards Institution)

    Part 3 of the BS 6465 sanitary installations series, the part on choosing and fitting the appliances rather than counting them. Published 31 Oct 2006 and withdrawn 26 Mar 2020, so cite it as historic good practice alongside the current Parts 1 and 2. It gives recommendations on the selection, installation and maintenance of the most commonly used sanitary and associated appliances in new and refurbished buildings, including hygiene, cleaning and maintenance of all sanitary installation units including electrical items, plus portable toilets used as supplementary facilities. It expressly does not deal with the detailed provisions of water supply, sanitary pipework or drainage, which sit in BS EN 12056 and Approved Document H. Its scope runs from private dwellings and care homes to workplaces, shops, schools and public toilets. Together with BS 6465-1 it superseded BS 6465-1:1994.

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19. strong RN-43IQ1S

    BSI (British Standards Institution)

    STATUS: WITHDRAWN on 25 February 2022. BS 7976-2:2002+A1:2013 was published 20 August 2002 and set out the method of operation for the pendulum tester used to assess slip resistance of pedestrian surfaces, that is how the pendulum test value (PTV) that every tile and flooring note quotes is actually obtained; part 1 covers the instrument specification and part 3 calibration. It excluded road and airfield surfaces, which are covered by BS EN 13036-4, and pendulum testing called up inside other product specifications. Because it is withdrawn, a note that says a bathroom or patio surface should achieve a PTV of 36 or more to BS 7976 is citing a withdrawn standard: the PTV thresholds themselves come from HSE and UK Slip Resistance Group guidance rather than from this standard, which is the more useful thing for a note to cite. Catalogue page confirms number, title, publication date, withdrawal date and scope.

    Name this source
20. strong RN-PNVHFZ

    BSI (British Standards Institution)

    The product standard for domestic thermostatic mixing valves, the anti-scald device Approved Document G relies on for its 48 degrees C bath limit. Published 31 Aug 2017 and withdrawn on 25 Mar 2026, so cite it as the standard a valve was made to rather than as a live requirement. It specifies general construction, performance and material requirements for PN 10 thermostatic mixing valves and the test methods for verifying mixed water temperature performance at the point of use below 45 degrees C. It applies to valves on sanitary appliances in kitchens, washrooms and bathrooms, and covers a valve serving a single outlet or a small number of outlets in a domestic application, for example one valve controlling a shower, bath, basin and bidet; valves designed for a large number of outlets in institutional use are excluded. The page notes a suitable bathing temperature is body temperature of about 38 degrees C, and that children scald at lower temperatures than adults. Tests are laboratory type tests, not production quality control tests.

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21. strong RN-XWFCEG

    BSI (British Standards Institution)

    STATUS: CURRENT, and it is a Designated Standard. BS EN 12380:2002 was published 17 December 2002, identical to EN 12380:2002, ISBN 0 580 40973 2, committee B/505, ICS 23.060.99 and 91.140.80. It specifies the requirements, test methods and evaluation of conformity for air admittance valves in drainage systems, the one way valves (often called by the trade name Durgo valve) that admit air to relieve negative pressure in a soil stack without letting foul air out, so a stack can be terminated internally rather than taken up through the roof. It is the standard to cite when a note explains that an AAV is acceptable for a new en suite or a relocated WC subject to Approved Document H, and that at least one stack on a drainage system must still be open to atmosphere. Catalogue page confirms number, title, date, status, ISBN, committee and scope; the tests are paywalled.

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22. strong RN-Y2B7CC

    BSI (British Standards Institution)

    STATUS: CURRENT. BS EN 13893:2002 was published 28 November 2002, is identical to EN 13893:2002, ISBN 0 580 40862 0, committee PRI/60, ICS 97.150. It specifies the method for measuring the dynamic coefficient of friction on DRY surfaces of resilient, laminate and textile floor coverings, and gives the DS classification that vinyl, laminate and carpet manufacturers declare. The key limitation for a note is in the title: it is a dry test, so a DS rating says nothing about wet slip performance in a bathroom or kitchen, where the relevant measure is the pendulum test value from the UK Slip Resistance Group method (formerly BS 7976-2, now withdrawn) or the ramp test classifications R9 to R13. Catalogue page confirms number, title, date, status, ISBN, committee and scope.

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23. strong RN-QPG4FD

    BSI (British Standards Institution)

    The product standard behind every domestic wash basin sold in the UK. Published 31 Oct 2018, current but under review; identical to EN 14688:2015+A1:2018, ICS 91.140.70 Sanitary installations, committee B/505 (listed as B/503 on the page), ISBN 978 0 580 97776 3. It specifies functional characteristics and test methods for washbasins for domestic purposes, covering construction, performance and safety plus factory production control, with named test regimes for thermal shock, abrasion, scratch hardness, chemical resistance, mechanical loading and overflow capacity. Its definition of domestic purposes expressly extends to hotels, student accommodation and hospitals except where special medical provisions are required, so a note can state that a basin badged to EN 14688 has been type-tested rather than merely CE or UKCA marked.

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24. strong RN-C18H5B

    BSI (British Standards Institution)

    The general specification for ordinary taps, as opposed to the thermostatic mixing valves covered by BS EN 1111. Published 31 Jan 2009 and withdrawn 4 Jan 2024, so cite it for what a tap was made to rather than as a live requirement. It specifies the field of application for pillar taps, bib taps, and single and multi-hole combination taps for use in specified types of water supply system, and sets the dimensional, leak tightness, pressure resistance, hydraulic performance, mechanical strength, endurance and acoustic characteristics of the various tap types, together with the test methods to verify each. The acoustic characteristic is the one buyers rarely know exists and is the basis for noise class claims on taps.

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25. strong RN-28LGZP

    BSI (British Standards Institution)

    The requirements part of the three-part European standard for waste fittings, which is what a bath, basin, bidet, shower tray or sink waste is actually made to. Published 4 Sep 2002 and still current, identical to EN 274-1:2002, ICS 91.140.70, committee B/505, ISBN 0 580 40336 X. Its scope covers wastes, overflows and traps for baths, wash basins, bidets, showers and sinks, so it is the citable authority for waste and overflow assemblies and for trap types. Parts 2 and 3 of the same series carry the test methods and the quality control requirements.

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26. strong RN-V6RE0V

    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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27. strong RN-05KG4M

    BSI Group

    What the Kitemark actually certifies, which matters because it is often confused with CE or UKCA marking and with BSI standards themselves. States that Kitemark certification confirms a product or service's claim has been independently and repeatedly tested by experts, so it is third-party certification of continued conformity rather than a manufacturer's own declaration. Records that the mark was originally known as the British Standard Mark and was first registered as a trademark in June 1903, giving it more than 120 years of use. Cites BSI's own consumer research that the Kitemark is recognised by 67 per cent of UK consumers, and that 70 per cent are more confident in products carrying it than in products that do not. Certification spans products, services and processes, including building information modelling and inclusive service certification, and BSI publishes a searchable Kitemark directory and a Verify a Certificate service for checking a specific certificate.

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28. strong RN-S7Q2D7

    Chartered Institute of Plumbing and Heating Engineering

    CIPHE guidance on what to do before a plumber arrives. For a burst pipe it gives the sequence: turn off the stop-valve on the incoming water supply main, often sited under the kitchen sink, or the external valve under a cover in the garden or path if there is no internal valve; if the water cannot be controlled, open all cold taps and flush the WC so pipework and storage drain quickly, but do not turn on hot taps; turn off the central heating, let a solid fuel boiler die out, switch off any electric immersion heater, then call a professional plumber. It explains that water in exposed and uninsulated pipework freezes and expands, splitting the pipe, and that a stray nail or screw during DIY is a frequent cause. For a frozen pipe it says to turn off the mains water at the internal stop valve first.

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29. strong RN-NMU95A

    Chartered Institute of Plumbing and Heating Engineering

    The CIPHE consumer hub on how plumbing and heating faults become health risks, grouped into burns and scalds, Legionnaires' disease, hot tubs and spa baths, carbon monoxide, lead poisoning, plumbing misconnections, Weil's disease (leptospirosis), landlord duties and advice after flooding. It states that a burn injury is for life and that most plumbing-related burn and scald injuries are avoidable, which is the professional-body backing for the 48 degree C bath limit in Approved Document G. It states that Legionnaires' disease is a type of pneumonia that can be deadly and that outbreaks can occur in all hot and cold water plumbing systems, and that use of lead has been banned since 1970 but lead remains in many homes. It says hundreds of thousands of UK properties have plumbing misconnections that pollute streams, rivers and beaches, which is the citation for checking where a new bathroom or utility waste actually discharges.

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30. strong RN-HBBEMM

    Chartered Institute of Plumbing and Heating Engineering

    The CIPHE's public verification tool for checking a plumbing or heating engineer's membership. A homeowner can search by membership number, which the tool recommends and says must be entered exactly as it appears on the engineer's CIPHE membership card, or alternatively by email address or phone number. This is the check to cite when a note tells a reader to confirm a plumber's professional credentials before engaging them, alongside the Gas Safe Register for gas work.

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31. strong RN-8WCI3J

    NICEIC

    Sets out how self-certification replaces a local authority building control application: a registered contractor does not notify the local authority in advance, but notifies the work online to NICEIC, which issues a building compliance certificate to the customer and tells the local authority the work took place, so building control charges are not payable by the consumer. Covers Building Regulations notification for gas, heating and hot water, ventilation, plumbing and microgeneration, with electrical-only contractors directed to the separate Domestic Installer Scheme. Scheme conditions state that contractors working in domestic dwellings must hold at least 2 million pounds of public liability insurance and must offer clients a warranty for completed work. Published fees are an initial application fee of 95 pounds plus assessment and certification of 595 pounds covering one to four units, with measures priced in units, for example heating or hot water systems 1 unit, sanitary convenience 2 units, solid fuel burning combustion appliance 2 units, and air source heat pumps 2 units.

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32. strong RN-6FMWAM

    UKAS

    The body that sits one level above every certification mark a product carries, and the answer to the question of who checks the checkers. UKAS states that it is the National Accreditation Body for the United Kingdom, appointed by government to assess and accredit organisations providing services including certification, testing, inspection, calibration, validation and verification. Its site carries a searchable directory of accredited organisations, an explanation of the difference between accreditation and certification, and an impartiality statement. This matters for the insulation and cladding clusters in particular: a performance claim tested at a UKAS accredited laboratory, or certified by a UKAS accredited certification body such as the BBA or WRAS, sits on a different footing from an in-house test result or a self-declared figure, and the directory lets that be checked rather than assumed.

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33. strong RN-X632BX

    Water Regs UK

    Water Regs UK's index of clause-by-clause guidance on the water fittings rules, organised by the regulation or byelaw number so a claim can be traced to its source. It covers notification of work to the water undertaker under Regulation 5 in England and Wales, Byelaw 5 in Scotland and Regulation 5 in Northern Ireland, showing that the three nations run parallel but separately numbered regimes; contractor's certificates under Regulation or Byelaw 6, which is the approved contractor self-certification route; products in contact with water under Schedule 2 paragraph 2; and the general requirements for water fittings under Schedule 2 paragraphs 3 and 4, which is where the requirement for a fitting to be of an appropriate quality and standard, or approved, sits. Further guidance covers pipework, system design and installation, backflow protection, cold water services, hot water systems and drinking water taps, each referenced to its Schedule 2 paragraph. Cite this for whether a particular job, such as a bidet, an outside tap or a new bathroom, is notifiable.

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34. strong RN-UQLSFV

    Water Regulations Approval Scheme

    The searchable directory of approved fittings and materials, organised by four-digit section number, which lets a reader check a specific product before buying. Sections include 0009 to 0046 backflow prevention devices, with the Schedule 2 Section 6.2 device types named in full: Type AB air gap with weir overflow, Type DC pipe interrupter with permanent atmosphere vent, Type BA verifiable reduced pressure zone valve, Type CA non-verifiable disconnector, Type EA verifiable single check valve giving Fluid Category 2 protection, Type EB non-verifiable single check valve for Fluid Category 2, and Types EC and ED double check valve assemblies giving Fluid Category 3 protection. Section 0120 cisterns storing water for domestic purposes references Schedule 2 paragraph 16(4) of the Water Supply (Water Fittings) Regulations 1999 for the essential items a cistern must include.

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35. strong RN-X6VAC2

    WaterRegsUK (Water Regs UK Limited, formerly WRAS)

    The regulator-facing explainer on backflow protection in bathrooms, useful because it puts numbers on tap gaps. It confirms the water fittings regulations apply in England, Wales and Northern Ireland while Scotland is governed by byelaws, so a note can state the rule differs by nation. Bath and basin taps in domestic premises are typically a fluid category 3 risk and non-domestic a category 5 risk; a toilet is always fluid category 5, normally satisfied by a built-in Type AUK1 arrangement. The Type AUK2 tap gap table for fluid category 3 gives a minimum air gap of 20 mm for tap connections up to and including 15 mm, 25 mm for connections larger than 15 mm but smaller than 20 mm, and 70 mm for 20 mm or larger. For fluid category 5 the Type AUK3 gap is 20 mm or twice the internal diameter of the tap connection, whichever is greater, so a 25 mm tap needs 50 mm. Single flow mixer taps additionally need single check valves on both supplies.

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36. strong RN-UNPP5R

    WaterRegsUK (Water Regulations Advisory Scheme)

    The rules for feeding a WC or washing machine from harvested rainwater, greywater or a borehole, and the reason a direct connection is never permitted. An alternative supply must never be directly connected to the mains drinking water; the only compliant arrangement is a break tank with a Type AA unrestricted or Type AB weir spillover air gap, the mains supply pipe kept outside the tank, discharging at a higher level and maintaining a minimum clearance of twice the internal diameter of the supply pipework (2D) or 20 mm, whichever is the greater, with no contact between the tank water and the mains inlet. The regulators rate a Type AB air gap as suitable protection against both back siphonage and back pressure at the highest contamination risk, fluid category 5. Whatever fluid is being conveyed, all pipework above or below ground should be marked in accordance with the latest version of BS 1710, and servicing valves should be labelled. Type AB installations should be inspected, cleaned and maintained as necessary every 6 months, per BS EN 806-5. Where premises have both a mains supply and an alternative source such as rainwater, a borehole or recycled water, the owner must notify the water undertaker.

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37. strong RN-IIRGYX

    WaterRegsUK (Water Regulations Advisory Scheme)

    How a plumber avoids the 10 working day notification and what paperwork the householder should get instead. An approved contractor is a member of one of the four approved contractor schemes, voluntary schemes for plumbers established under regulation 1(2) of the Water Supply (Water Fittings) Regulations in England, Wales and Northern Ireland and byelaw 1(2) in Scotland. The four named schemes are the Water Industry Approved Plumbers' Scheme (WIAPS), which operates for 18 water undertakers, the Association of Plumbing and Heating Contractors, the Chartered Institute of Plumbing and Heating Engineering, and the Scottish and Northern Ireland Plumbing Employers' Federation. Full members may certify all types of plumbing work in any premises; sector scheme members may certify only the limited work within their defined scope, for example groundworkers, catering installers or point-of-use installers, so membership alone is not enough for an unvented cylinder or a whole bathroom. On completion the contractor must issue a certificate of compliance, also called a work completed certificate, to both the client and the water undertaker, and that certificate acts as a legal defence if the work is later found non-compliant.

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38. strong RN-D4T1IG

    WaterRegsUK (Water Regulations Advisory Scheme)

    The practical translation of Schedule 2 paragraph 15, which requires every plumbing system to incorporate protection against backflow, and it is the page that decides whether a tap may be fitted below the spillover level. Fluid categories: 1 wholesome mains water; 2 water whose taste, odour, appearance or temperature has changed, including hot water; 3 slight health hazard, such as common disinfectants; 4 significant health hazard, such as pesticides; 5 serious health hazard, including pathogens and faecal matter. The device fitted must be rated at or above the highest category downstream, for back pressure or back siphonage as applicable. Non-mechanical air gaps: Type AA unrestricted discharge and Type AB weir overflow both protect to category 5. Type AUK2, the tap gap over a domestic bath, basin, bidet or sink, requires a minimum vertical distance from outlet to spillover level of 20 mm for outlets up to G1/2, 25 mm above G1/2 up to G3/4 and 70 mm above G3/4. Type AUK3, over higher-risk appliances, requires 20 mm or twice the inlet pipe diameter, whichever is greater. Mechanical: Type BA RPZ valve to category 4, Type EC and ED double check valves to category 3, Type EA and EB single check valves to category 2. A Type DC pipe interrupter over a WC must sit at least 300 mm above the pan spillover level, or 150 mm in Scotland, and discharge vertically downward.

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39. strong RN-4TB144

    WaterRegsUK (Water Regulations Advisory Scheme)

    What the water regulations demand of the cold water cistern sitting in the loft, which matters as soon as a loft is boarded, insulated or converted. Every cistern needs a rigid, close fitting and securely fixed lid or cover, of a material that does not shatter or fragment when broken, so that light and insects are excluded. Overflow and warning pipes must be screened with a mesh no greater than 0.65 mm opening, the screen fitted vertically and removable for cleaning. The minimum internal diameter of a warning pipe is 19 mm, and every cistern must have an overflow with a warning pipe to signal impending overflow. Cisterns over 1,000 litres should be capable of inspection and cleansing without being wholly uncovered. Storage volume should be sized to avoid stagnation, following BS EN 806-2. Both hot and cold pipework should be insulated so stored cold water is not warmed. The page names the applicable Schedule 2 paragraphs across England and Wales, Scotland and Northern Ireland as 2 to 11, 14, 15, 16, 20 and 27.

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40. strong RN-9KXJXY

    WaterRegsUK (Water Regulations Advisory Scheme)

    How a fitting actually proves it complies, and why a WRAS logo is evidence rather than a legal passport. Water undertakers consider declarations of performance issued against designated standards, product certification and test reports, judged case by case, with no single mandated format. The routes are conformity with an appropriate British Standard such as BS EN 806 or BS 8558, conformity with a specification approved by the regulators, and for any material in contact with drinking water, compliance with BS 6920 on the effect of materials on water quality. Water undertakers retain absolute discretion on whether an alternative national specification gives equivalent protection. For white goods the page warns that BS EN 61770, the standard for connecting appliances to the water mains, is not sufficient on its own: additional evidence of BS 6920 compliance and conformity with the Regulators' Specification is required, which is the usual reason an imported dishwasher or washing machine hose fails. The overriding principle it states is that being of an appropriate quality and standard does not of itself guarantee compliance, because suitability depends on the system, environment and operating conditions in which the fitting is used.

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