Heating, Plumbing & Electrics
255 sources in the library on heating, plumbing & electrics, 32 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 7.
- very strong RN-TPT915 cited
Department for Environment, Food and Rural Affairs
Defra guidance, last revised 28 September 2011, and the authoritative plain-English account of the private sewers transfer that most drainage guides get vague about. Paragraph 2: on 1 OCTOBER 2011 all privately owned sewers and lateral drains which communicate with (drain to) an existing public sewer as at 1 JULY 2011 became the responsibility of the sewerage undertaker. Paragraph 3: private pumping stations on transferred pipework transfer between 1 October 2011 and 1 OCTOBER 2016, with any not transferred earlier transferring on that date; pipework upstream of a pumping station transferred on 1 October 2011. Definitions (from s.219 Water Industry Act 1991): a SEWER is a drain shared or used by more than one property; a LATERAL DRAIN serves a single property but lies outside its curtilage, under another property or the street. Both definitions include manholes, ventilating shafts, access chambers, pumps and valves. Paragraph 48: an occupier can only commission work within the private drain and has no authority to commission work in a public sewer or lateral drain without first contacting the water and sewerage company. Paragraph 49: interfering with a public sewer or public lateral drain without consent may lead to prosecution.
Cited in Blocked Drains: Causes & Clearing Costs.
- very strong RN-SA820P cited
GOV.UK
Countryside Stewardship capital item FG3. Payment rate £5.66 per metre. Specification: erect wire fencing at least 1.05 m high using a minimum of 4 mild steel or high tensile plain wires, with a mains-operated energiser installed to the manufacturer's recommendations. Wooden straining posts at least 150 mm top diameter by 2.1 m long, intermediates 1.65 m long by 65 mm top diameter, struts 2.1 m by 75 mm; metal straining posts at least 2.4 m and intermediates at least 1.65 m. One of very few official per-metre rates for fencing, useful as a sanity check on market prices in a cost note.
- very strong RN-KJLMZ3 cited
GOV.UK
Defra's land manager half of the Countryside Code, and the national statement on electric fencing near public access. You can use barbed wire and electric fencing to keep livestock or horses separated from visitors on rights of way, but you must leave enough space for the visitor to use the path safely, not impinge on the legal width of a right of way, and use signs to warn visitors that the fence is electric. It also advises plain wire where the public is likely to come into contact with a fence, gate or stile. Cite this rather than the Electricity at Work Regulations 1989, which contain no electric fence signage duty.
- very strong RN-QD1SFF cited
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.
- very strong RN-SM6TRW cited
Ministry of Housing, Communities and Local Government
The statutory source for soakaway design and the discharge hierarchy every garden drainage note should state. Requirement H3(3) lists the order of priority for rainwater discharge: (a) an adequate soakaway or other adequate infiltration system, or where not reasonably practicable (b) a watercourse, or where not reasonably practicable (c) a sewer. Paragraph 3.25 bars infiltration devices within 5 metres of a building or road, in ground where the water table reaches the bottom of the device at any time of year, too close to other drainage fields or soakaways, or where contamination could pollute groundwater. Paragraph 3.26: soakaways serving less than 100 square metres are generally square or circular pits filled with rubble or lined with dry-jointed masonry or perforated ring units. Paragraph 3.27: design to a return period of once in ten years, and for small soakaways serving 25 square metres or less a design rainfall of 10mm in 5 minutes may be assumed as the worst case. Paragraph 3.28 requires percolation tests to derive the infiltration rate, and paragraph 3.30 sends larger soakaways to BS EN 752-4 or BRE Digest 365 Soakaway design. Paragraphs 2.10 to 2.12 cover pervious paving over a granular storage reservoir and warn against its use where sediment or oil spillage would block the pores. For foul drainage, paragraph 2.33 sets a minimum 75mm internal diameter, or 100mm for a WC, and Table 6 gives minimum gradients of 1 in 40 for 75mm and 100mm at peak flows under 1 litre per second.
Cited in Adding an Ensuite: Cost, Layout & Plumbing, Annexe & Granny Flat: Cost, Planning & Rules, Blocked Drains: Causes & Clearing Costs, Garden Drainage & Soakaways Explained and 21 more.
- very strong RN-VGR6O6 cited
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.
- very strong RN-2OL81U cited
Ministry of Housing, Communities and Local Government
The authoritative list of authorised competent person scheme operators and the work each may self-certify. For 'In dwellings - installation of fixed low or extra-low voltage electrical installations' the authorised operators are BESCA, Blue Flame Certification, Certsure, NAPIT and OFTEC. Certsure LLP trades as NICEIC. ELECSA does not appear: it is no longer an authorised scheme operator, so any note naming ELECSA as a current Part P scheme is stale. Members of an electrical scheme are listed on the electrical competent person register.
Cited in Ceiling Fan Installation Cost: 2026 UK Price Guide.
- very strong RN-IUHGG0 cited
Ministry of Housing, Communities and Local Government
The definitive figures for an EICR note. The electrical installation must be inspected and tested at least every 5 years by a qualified person competent to undertake the inspection and testing, against the 18th Edition of the Wiring Regulations published as British Standard 7671. The report must go to existing tenants within 28 days of the inspection and test, to new tenants before they occupy the premises, and to the local council within 7 days of a request. Remedial work must be completed within 28 days, or any shorter period specified as necessary in the report. The observation codes are C1 danger present with risk of injury, C2 potentially dangerous, C3 improvement recommended and not mandatory, and FI further investigation required without delay. A local housing authority can impose a financial penalty of up to £40,000.
Cited in Building Surveys: Level 1, 2 & 3 Explained & Cost, EICR & Electrical Safety Checks, How Much Does Rewiring a House Cost? (UK).
- very strong RN-JZ8ZFM cited
Ministry of Housing, Communities and Local Government
Approved Document P, electrical safety in dwellings, 2013 edition (ISBN 978 1 85946 485 4). Paragraph 1.1 requires electrical installations to be designed and installed in accordance with BS 7671. Paragraph 2.5 sets out the notifiable work in regulation 12(6A): installation of a new circuit, replacement of a consumer unit, and any addition or alteration to existing circuits in a special location, where regulation 12(9) defines special location by reference to the space around a bath tub or shower tray. Paragraph 1.4 notes that one way of complying with Part M in new dwellings is to mount consumer units so the switches sit between 1350mm and 1450mm above floor level. Everything else, including adding a socket to an existing circuit outside a special location, is non-notifiable but must still comply with BS 7671.
Cited in Ceiling Fan Installation Cost: 2026 UK Price Guide, Media Walls: Cost, Build & Ideas.
- very strong RN-2WZR3Y cited
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.
- very strong RN-Y19S87 cited
Office for Product Safety and Standards and Ministry of Housing, Communities and Local Government
Names the Office for Product Safety and Standards as the UK regulator for construction products and most consumer goods, a role it took on in April 2021, funded by and acting on behalf of MHCLG. Confirms the enforced legislation is the Construction Products Regulations 2013 as amended by the Construction Products (Amendment) Regulations 2022, which gave OPSS its enforcement powers. Records that the Grenfell Tower Inquiry final report was published on 4 September 2024, the Government response on 26 February 2025 accepting all 58 recommendations, and a Construction Products Reform White Paper on 25 February 2026 proposing reform of testing, certification, product information and enforcement. OPSS carries out product testing, site inspections and technical documentation reviews, responded to over 100 non-compliance allegations in 2023, and publishes construction product safety alerts, reports and recalls.
- very strong RN-9EETD9 cited
Office for Zero Emission Vehicles
Electric vehicle chargepoint grants, government guidance cited for the figures and rules it sets out
Cited in Build Garage Cost: 2026 UK Price Guide, EV Charger Installation at Home: Cost & Rules.
- very strong RN-HCZJP3 cited
The National Archives
SI 2011/1566 regulation 3, the legal instrument behind the private sewers transfer. It requires the Secretary of State to make a main scheme for the adoption of private sewers and private lateral drains by every sewerage undertaker whose area is wholly or mainly in England, with the Welsh Ministers doing the same for Wales. The vesting date for private sewers and lateral drains (excluding pumping stations) is 1st October 2011; pumping stations vest no later than 1st October 2016. The main scheme catches pipework situated in the undertaker's area which immediately before 1st July 2011 communicated with a public sewer (or, for a lateral drain, with a public sewer vested in that undertaker), excluding exempt sewers and those already subject to a declaration. This is the citation to use instead of a vague 'since 2011' or a bare 'Water Industry Act 1991 (amended)'.
Cited in Blocked Drains: Causes & Clearing Costs.
- very strong RN-TTNQO7 cited
The National Archives
The statutory duty behind 'the water company has to deal with it'. Section 94(1) requires every sewerage undertaker to provide, improve and extend such a system of public sewers, and so to cleanse and maintain those sewers AND ANY LATERAL DRAINS WHICH BELONG TO OR VEST IN THE UNDERTAKER, as to ensure that its area is and continues to be effectually drained, and to make provision for emptying those sewers and dealing with their contents at sewage disposal works. IMPORTANT LIMIT for consumer guidance: section 94(3) makes the duty enforceable by the Secretary of State, or by the Authority (Ofwat) with the Secretary of State's consent or general authorisation - it is not a duty a householder enforces directly, so wording like 'they are legally obliged to attend' overstates it.
Cited in Blocked Drains: Causes & Clearing Costs.
- 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.
- very strong RN-16LK2T cited
The National Archives (legislation.gov.uk)
Sets the declared characteristics of the UK public supply. Declared frequency is 50 Hz. For a low voltage supply the declared voltage is 230 volts between phase and neutral conductors at the supply terminals. Permitted variations are 1 per cent above or below the declared frequency; for low voltage, a variation not exceeding 10 per cent above or 6 per cent below the declared voltage; for high voltage below 132 kV, 6 per cent either way; at or above 132 kV, 10 per cent either way. This is the authority for correcting '240 V' in appliance and electrical copy: 240 V has not been the declared nominal voltage since harmonisation, though it sits inside the +10% tolerance.
Cited in Install A Macerating Toilet Cost: 2026 UK Price Guide.
- very strong RN-DB5N1U cited
The National Archives (legislation.gov.uk)
England's general conditions for keeping farmed animals. Paragraph 2(1): animals kept in husbandry systems in which their welfare depends on frequent human attention must be thoroughly inspected at least once a day. Paragraph 18: all automated or mechanical equipment essential for the health and well-being of the animals must be inspected at least once a day to check there is no defect. Paragraph 11: materials used for accommodation, pens, cages, stalls and equipment the animals may contact must not be harmful. Paragraph 12: accommodation and fittings must have no sharp edges or protrusions likely to cause injury. This is the instrument for daily stock checks, not the welfare in transport rules, which govern moving animals.
- very strong RN-1MN06H cited
The National Archives (legislation.gov.uk), Northern Ireland Statutory Rules
NORTHERN IRELAND, and the part letters mean different things from England, so quoting an England part letter into an NI note is a straight error. The parts are A interpretation and general, B materials and workmanship, C site preparation and resistance to contaminants and moisture, D structure, E fire safety, F conservation of fuel and power, G resistance to the passage of sound, H stairs, ramps, guarding and protection from impact, J solid waste, K ventilation, L combustion appliances and fuel storage systems, N drainage, P sanitary appliances, unvented hot water storage systems and reducing the risk of scalding, R access to and use of buildings, and V glazing. So NI Part D is England's Part A, NI Part E is England's Part B, NI Part F is England's Part L, NI Part K is England's Part F, NI Part L is England's Part J, NI Part N is England's Part H, NI Part P is England's Part G and emphatically NOT electrical safety, NI Part R is England's Part M, and NI Part V is glazing. There is NO part covering electrical safety anywhere in these regulations, so domestic electrical work in Northern Ireland is not notifiable building work as it is under England's and Wales's Part P. Regulation 41 imposes consequential improvements, regulation 42 change of energy status and regulation 43 renovation of thermal elements.
- very strong RN-XHATOQ cited
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.
- very strong RN-IKLPS9 cited
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.
- strong RN-7QIL5Z cited
BSI
The standard behind any correct radiator or boiler sizing figure, published 31 July 2017 and current but under review. It gives methods for calculating the design heat load for single rooms, building entities and whole buildings, where design heat load is the heat supply in watts needed to hold the required internal design temperature under design external conditions. The calculation is carried out before heating system components are dimensioned and accounts for multiple heat emission devices in one room, domestic hot water heating power where significant, and how required heating power is split between multiple heat generators. It sits in the EPB standard set as Module M3-3, with PD CEN/TR 12831-2 as the explanatory companion. Cite this when a note says a BTU calculator is a shortcut for a proper room-by-room heat loss calculation.
Cited in Boiler Sizing: What kW Do You Need, Radiator vs Underfloor Heating: Which to Choose.
- 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-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.
- strong RN-0BO72H cited
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-LUDU9F cited
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).
- strong RN-GZ3QEK cited
Institution of Engineering and Technology
IET FAQ page on Section 722 of BS 7671. States that Regulation 722.531.2.101 requires the charging point to be RCD protected by its own RCD of at least a Type A, having a residual operating current not exceeding 30 mA, and that the requirement attaches to the charging point rather than necessarily the whole final circuit. Notes that in practice the RCD will usually be installed within the charging equipment and advises verifying this with the equipment supplier. Refers on to the IET Code of Practice for Electric Vehicle Charging Equipment Installation. Useful for correcting notes that claim a Type B or Type F RCD is required for domestic EV chargers.
- 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-7N6Z4I cited
Joint Industry Board for the Electrical Contracting Industry
JIB Handbook 2026, Section 2: National Working Rules for the Electrical Contracting Industry, the negotiated national working rules and pay rates for electrical contracting, which is what a JIB-graded operative is paid rather than what a customer is charged
Cited in Build Garage Cost: 2026 UK Price Guide, Ceiling Fan Installation Cost: 2026 UK Price Guide, Contractor vs Individual Trades: Which to Hire for a Renovation.
- supplier figure RN-EBJT9L cited
Screwfix
Screwfix, Time Cat 6 Purple LSZH 4-Pair 8-Core Unshielded Ethernet Cable 305m Box. Held in the cost register as a price source; the passage quoted against it reads: Time Cat 6 Purple LSZH 4-Pair 8-Core Unshielded Ethernet Cable 305m Box :: £151.69
Cited in Home Networking & Data Points.
- supplier figure RN-WL3NLJ cited
Stelrad
The manufacturer output tables that radiator sizing depends on. Stelrad states that t50 is the UK industry standard for heating outputs, with an operating temperature of 75/65/20C, and directs users on a low temperature heat source to the t40 or t30 tables instead. At 450mm height and 1000mm length the delta T50 output is 756 W for a K1 single panel single convector, 1055 W for a P+ single panel double convector and 1371 W for a K2 double panel double convector. At 450mm by 1200mm the figures are 907 W, 1266 W and 1645 W. At 300mm by 1000mm they are 509 W, 745 W and 982 W. At 600mm height by 400mm length they are 392 W, 538 W and 693 W. Panel depths are 61mm for K1, 77mm for P+ and 100mm for K2, with total wall projections of 83mm, 101mm and 124mm. Heated surface area runs 2.09 to 9.15 m2 per metre and weight 9.31 to 40.53 kg per metre depending on type and height. Lengths run 300mm to 3000mm. The t50 caveat is the important part: a heat pump running at 45C flow will not get these numbers.
Cited in How to Bleed & Balance Radiators.
- supplier figure RN-O136RH cited
Toolstation
the retail price Toolstation publishes for pitacs twin earth cable 6242y grey, which is the supply figure the cost book records for this item
- secondary RN-OLJWGB cited
Checkatrade
Checkatrade's cost guide for adding a plug socket to a room, updated June 2026 and, it says, verified by estimators who are members of the RICS and the CIOB. Held for the band it puts on adding a socket to an existing circuit, single, double or USB alike, and for the UK average inside it. A quote aggregator's own estimate, so an order of magnitude rather than an independent measurement.
- very strong RN-UM90J1
Dwr Cymru Welsh Water
WALES and parts of England, since Dwr Cymru Welsh Water's operating area crosses the border. You must notify Welsh Water if extending over or within THREE METRES of a public sewer or lateral drain, across a network of more than 30,000 km of sewers. An application is unlikely to be accepted where the sewer's internal diameter exceeds 225 mm or the pipe is deeper than 3 metres, and a greater standoff may then be required; commercial extensions and new detached structures need a sewer diversion instead. Nothing may be built over or near water mains or pressurised sewers. There are two routes, self-certification against set criteria and a full application with technical assessment. The published charges are £278.10 for consent by letter with no network alterations, £936.85 for consent by letter after alterations, and £1,053.00 for consent by legal agreement, covering administration, any site inspection, technical support, liaison with building control or the approved inspector, and issue of the consent. Work must not start until consent is given, and sewer traces are strongly recommended before excavating. Accessibility adaptations get extra support via the Build Over Sewers team on 0800 917 2652.
- very strong RN-29Q74H
National Police Chiefs' Council
The NPCC document that decides whether a monitored alarm gets a police response, adopted by forces in England, Wales and Northern Ireland. To be compliant a security system must comply with a recognised public domain standard or code of practice covering manufacture, installation, maintenance and operation, and the installing, maintaining and monitoring companies must be certified by a UKAS accredited certification body. Type A remote signalling systems must be monitored by an Alarm Receiving Centre, Remote Video Response Centre or System Operating Centre complying with BS 5979 (Cat II) or BS EN 50518 and BS 8591, and a Unique Reference Number is issued by the police force only to systems monitored by such a centre. Consumer protections in the 2018 revision matter for a cost note: monitoring and maintenance contracts shall not exceed three years and payments in advance shall not exceed one year, companies must not misrepresent the cost of a URN to clients, a customer must be informed if a URN is cancelled for non-payment of the administration fee, and call back confirmation is available to domestic and residential premises only, having been withdrawn for commercial premises. False activation management and keyholding and response are covered by their own British Standards, and the document sets out URN withdrawal for repeated false alarms.
- 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-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.
- very strong RN-L6C7A7
Health and Safety Executive
Regulation 36A of the Gas Safety (Installation and Use) Regulations 1998 requires a landlord to arrange an annual gas safety check within 12 months of a new appliance or flue being installed and annually thereafter. Only a Gas Safe registered engineer may carry out the maintenance and the safety check. The record must be kept for 2 years, given to existing tenants within 28 days of the check and to new tenants before they move in. Under the 2018 Amendment Regulations the check may be carried out up to 2 months before the due date while keeping the original deadline date, so the anniversary does not drift.
- very strong RN-1PUNR2
Health and Safety Executive
The HSE's proportionality statement on legionella in domestic property, which corrects the common claim that landlords need a paid legionella certificate. Defines a landlord for this purpose as anyone renting out a property they own under a lease or licence shorter than 7 years, covering local authorities, housing associations, private landlords, housing co-operatives and hostels, and including renting a room within your own home. Identifies the legal basis as section 3(2) of the Health and Safety at Work etc Act 1974, with section 53 treating landlords as self-employed, plus the Control of Substances Hazardous to Health Regulations, and the Approved Code of Practice L8 on the control of legionella bacteria in water systems. States plainly that while there is a duty to assess the risk, this does not require an in-depth, detailed assessment, and that risks in most residential settings are generally low because of regular water usage and turnover. Sets out the low-risk profile: daily water use sufficient to turn over the entire system, cold water direct from a wholesome mains supply with no stored water tanks, and hot water from instantaneous or low volume heaters.
- very strong RN-SN2RBW
Health and Safety Executive
The HSE leaflet that carries the temperature range every hot water and cylinder note should cite. States there is a reasonably foreseeable legionella risk where water is stored or re-circulated, where water temperature in all or part of the system is between 20 and 45 degrees Celsius, where there are nutrients such as rust, sludge, scale and organic matter, and where water droplets can be produced and dispersed, giving showers and cooling tower aerosols as examples. Defines legionellosis as the collective name for the pneumonia-like illness caused by legionella bacteria, covering legionnaires' disease itself plus the less serious Pontiac fever and Lochgoilhead fever, and notes everyone is susceptible but higher risk attaches to people over 45, smokers and heavy drinkers, people with chronic respiratory or kidney disease, and anyone with an impaired immune system. Legionella pneumophila occurs naturally in rivers, lakes and reservoirs in low numbers but multiplies in purpose-built systems including cooling towers, evaporative condensers, hot and cold water systems, whirlpool and spa pools, humidifiers and air washers. Published 04/12 as leaflet INDG458, and points to the Approved Code of Practice L8 for detail on control.