Repairs & Maintenance
195 sources in the library on repairs & maintenance, 40 on this page cited in a published note. Each one says what the document covers and what it is good for. Name a source to see which document it is and where to read it. One at a time. Page 1 of 5.
- 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-D2PRMR cited
Department for Levelling Up, Housing and Communities and UK Health Security Agency (gov.uk)
The government's own classification of damp types and the single best citation for the point that damp is a building fault, not a housekeeping failure. Damp is defined as the build up of moisture in a property, and four types are named: condensation, where moisture generated inside the home cools and condenses onto colder parts; penetrating damp, where water gets in from outside due to defects; rising damp, where moisture from the ground rises up through parts of the building; and traumatic damp, caused by leaking waste and heating pipes or overflowing baths and sinks. The health effects predominantly affect the airways and lungs and include cough, wheeze, shortness of breath, airway infections including aspergillosis and worsening of asthma, and can cause serious illness and in the most severe cases death. Children, older people, people with pre-existing health conditions or weakened immune systems, pregnant women and people with mental health conditions are most at risk. The guidance states plainly that it is totally unreasonable to blame damp and mould in the home on lifestyle choices. It was written in response to the coroner's report on the death of two-year-old Awaab Ishak in December 2020 from a severe respiratory infection caused by prolonged exposure to damp and mould in his home.
Cited in Condensation, Mould & Black Spots: Causes & Fixes, Damp Survey: Cost & What to Expect, Damp Walls: Diagnosing the Type, Rising Damp vs Penetrating Damp: Causes & Fixes.
- very strong RN-2PCYXZ cited
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.
Cited in Renovating a 1930s House.
- very strong RN-AE0RHQ cited
Health and Safety Executive
The sheet every other asbestos essentials task sheet tells you to read first, and the right citation for a DIY note that touches pre-2000 fabric. It states that large amounts of asbestos were used in new and refurbished buildings before 2000, that blue (crocidolite) and brown (amosite) asbestos were banned by law in 1985 and manufacture and supply of all asbestos was banned by the end of 1999, and that existing asbestos articles may stay in use until the end of their service life. It names the diseases as mesothelioma, lung cancer and asbestosis, with a latency of 15 to 60 years, incurable and often fatal. It divides the work: higher-risk work with sprayed coatings, loose asbestos, lagging, insulation and asbestos insulating board, apart from some very limited-duration AIB work, requires an HSE-licensed contractor, while the task sheets cover non-licensed work only if done exactly as described. The trades listed as most likely to disturb asbestos include electricians, joiners, plumbers, gas fitters, roofers, plasterers, painters and decorators, which is precisely the DIY work a how-to note describes.
- very strong RN-CDLNT7 cited
Health and Safety Executive
The specific HSE information sheet behind the dust advice, with the numbers a note can quote. Names three types of construction dust: silica dust, also called respirable crystalline silica, from concrete, mortar and sandstone; wood dust from softwood, hardwood and wood-based products including MDF and plywood; and other general dust from materials with little or no silica, most commonly gypsum as in plasterboard, limestone, marble and dolomite. States that over 500 construction workers are believed to die from exposure to silica dust every year, and that the main dust-related diseases are lung cancer, silicosis, chronic obstructive pulmonary disease and asthma, most developing slowly though advanced silicosis and asthma can come on quickly. The legal framework is the Control of Substances Hazardous to Health Regulations 2002, and the three required steps are Assess, Control and Review. On damping down it corrects a common site habit: water needs enough supply at the right levels for the whole time the work is being done, and just wetting the material beforehand does not work. High dust levels come from high-energy tools such as cut-off saws, grinders and grit blasters.
Cited in How to Insulate a Loft (DIY), How to Insulate A Vaulted Ceiling In 5 Steps, How to Lay a Patio, How to Sand & Restore Floorboards and 4 more.
- very strong RN-P72KJ9 cited
Health and Safety Executive
The HSE starting point for the pre-2000 rule that every renovation note should carry as a warning. Asbestos was used in many industries and buildings until it was banned in 1999, and HSE states that buildings constructed after 2000 are unlikely to contain asbestos, so the risk sits with anything built or refurbished before that date. Around 5,000 people die every year from asbestos-related diseases, making it the leading cause of work-related deaths in Great Britain. The danger comes from disturbing the material through drilling, refurbishment, demolition and installation work rather than from its presence alone. Compliance is governed by the Control of Asbestos Regulations and the Approved Code of Practice, Managing and working with asbestos, and a separate HSE section sets out when a licensed contractor must do the work.
Cited in Average Loft Conversion Cost: Real 2026 Breakdown by Type, Garage Conversion to a Bedroom: Cost & Rules, Reclaimed Materials: Buying & Using.
- very strong RN-RQ6ROG cited
Health and Safety Executive
HSE's ladder guidance, product standards page. It names EN 131 as the standard for portable steps and ladders, the older BS 2037 and BS 1129 having been withdrawn.
Cited in Guttering Repair & Cleaning.
- very strong RN-21AA4H cited
Health and Safety Executive
The HSE rules a DIY note should quote whenever a job involves a ladder, in HSE's own words. For a leaning ladder, use the 1 in 4 rule: the ladder should be one space or unit of measurement out for every four spaces or units up, which is a 75 degree angle. Do not work off the top three rungs, and make sure the ladder extends at least 1 metre or three rungs above the point where you are working. Maintain three points of contact when climbing and wherever possible at the work position. Secure the ladder, for example by tying it, to prevent it slipping outwards or sideways. Only carry light materials and tools. For stepladders, do not stand and work on the top three steps, including a step forming the very top of the stepladder, unless there is a suitable handhold, and maintain three points of contact at the working position, meaning two feet and one hand. HSE frames ladders as suitable for low-risk, short-duration tasks only, which is the test to apply before recommending one for a whole-roof or whole-wall job.
Cited in Guttering Repair & Cleaning, The Complete UK Roofing Guide (2026).
- very strong RN-KS3PJK cited
Health and Safety Executive
The specific HSE sheet a floor sanding or joinery note should cite instead of a generic dust warning. WIS23 Revision 3 states that all wood dust is a substance hazardous to health because it can cause serious non-reversible problems including asthma, dermatitis and irritation of the eyes, nose and throat, and that hardwood dust can also cause a rare type of nasal cancer. It identifies fine dust as the biggest risk because it is breathed deep into the lungs and travels furthest from the process, so ledges and surfaces need regular cleaning. Wood dust is also flammable and can cause fire or explosion, with premises severely damaged or destroyed every year by wood dust fires that usually start in dust extraction equipment. The activities named as producing high exposures are machining, particularly sawing, routing and turning; sanding by machine and by hand-held powered sanders; using compressed airlines to blow dust off work, which is to be avoided; bagging dust from extraction systems; and housekeeping, especially dry sweeping. Wood dust is covered by COSHH.
- very strong RN-PI071K cited
Historic England
Historic England's technical advice on looking after gutters and downpipes. It explains that rainwater systems need regular inspection and maintenance to protect a building from water penetration.
Cited in Guttering Repair & Cleaning.
- very strong RN-V263DP cited
Historic England
Historic England's home maintenance checklist. It advises clearing gutters, hoppers and pipes after leaf fall, at least every autumn and preferably more often.
Cited in Guttering Repair & Cleaning.
- very strong RN-3JA55J cited
Historic England
Historic England's best-practice guidance on repointing older brick and stone walls, which warns that unsuitable repointing harms the durability of masonry and that only affected areas usually need it.
Cited in Choosing Stone Restoration Or Replacement Brickwork, Efflorescence & White Staining on Brick, Spalling Brick Repair Cost: 2026 UK Price Guide.
- very strong RN-FE0I2H cited
Historic England
Historic England's advice on replacing and upgrading rainwater goods on historic buildings. It says wholesale replacement in PVCu is not generally acceptable on a designated building.
Cited in Guttering Repair & Cleaning.
- very strong RN-CRNETJ cited
Historic Environment Division, Department for Communities (Northern Ireland)
NORTHERN IRELAND, with a fifth grading system distinct from every other nation. There are over 9,100 listed buildings in Northern Ireland, designated as being of special architectural or historic interest under SECTION 80 OF THE PLANNING ACT (NORTHERN IRELAND) 2011, not England's Planning (Listed Buildings and Conservation Areas) Act 1990. Statutory listing began in Northern Ireland in 1974 and the First Survey took over 20 years. Grades are A, B+, B, B1 and B2, against England's I, II* and II and Scotland's A, B and C, but the statutory controls apply EQUALLY to all listed buildings irrespective of grade, so the NI grade does not change what consent is needed. Listing covers the complete interior and exterior and can extend to fixtures and free standing objects within the curtilage. The Historic Environment Division is a statutory consultee to the local councils, which determine listed building consent applications. Records sit in the NI Buildings Database, the Historic Environment Map Viewer and the Historic Environment Register of Northern Ireland.
- very strong RN-L1KT0Q cited
LABC
LABC guidance on notching and drilling solid timber joists: notches between 0.07 and 0.25 of the span, no deeper than 0.125 of the depth, 35 mm maximum, top or bottom only.
Cited in Sagging or Bouncy Floors: Causes & Fixes.
- very strong RN-NPO8FJ cited
Ministry of Housing, Communities and Local Government
The statutory figures behind a damp diagnosis, and the numbers to quote when a note explains why ground levels or a bridged damp proof course cause rising damp. Paragraph 5.2 requires that in an external wall the damp-proof course should be at least 150mm above the level of the adjoining ground (Diagram 8) unless part of the building protects the wall, and that in an external cavity wall the cavity should be taken down at least 225mm below the level of the lowest damp-proof course, or a damp-proof tray provided (Diagram 9a). For suspended timber ground floors it requires a ventilated air space of at least 75mm from the ground covering to the underside of any wall-plates and at least 150mm to the underside of the suspended timber floor or insulation, with ventilation openings on two opposing external walls of not less than 1,500mm2 per metre run of external wall or 500mm2 per square metre of floor area, whichever is greater; for suspended concrete floors the clear ventilated space is at least 150mm with the same opening sizes. Section 2.39 onwards covers radon, referring to BRE Report BR 211 for protective measures. The 2013 edition was published on 3 September 2013 with changes in effect from 1 October 2013.
Cited in Barge Boards, Fascias & Soffits: Cost & Replacement, Breathable Membranes for Roofs & Walls, Brick Slips & Brick Cladding Systems, Build Basement Cost: 2026 UK Price Guide and 46 more.
- 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, All You Need To Know About Double Glazing Repairs, Annexe & Granny Flat: Cost, Planning & Rules, Basement & Cellar Conversions: Cost and 57 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, Basins & Vanity Units: A Buyer's Guide, Baths Compared: Freestanding, Inset & Shower Baths and 33 more.
- very strong RN-L0FCJX cited
Ministry of Housing, Communities and Local Government
The in-force U-value tables a DIY insulation or door note must quote, with the exact numbers. Table 4.2, limiting U-values for new fabric elements in existing dwellings, sets roof 0.15, wall 0.18, floor 0.18, swimming pool basin 0.25, window 1.4 or Window Energy Rating Band B minimum, rooflight 2.2, doors with more than 60 per cent of the internal face glazed 1.4 or Doorset Energy Rating Band C minimum, and other doors 1.4 or Doorset Energy Rating Band B minimum. Table 4.3, for existing elements, gives a roof threshold of 0.35 and an improved value of 0.16, which is the figure a loft insulation note needs: paragraph 4.12 says a retained element whose U-value is higher than the column (a) threshold, for example through a loft or garage conversion, should be upgraded to the column (b) value. Paragraph 4.13 allows a lesser upgrade only where the improved value is not technically or functionally feasible or would not achieve a simple payback of 15 years or less. Paragraph 4.8 requires a replacement element to be no worse than the one it replaces as well as meeting Table 4.2. Paragraph 4.10 gives the heritage exception: where character must be maintained, a centre pane U-value of no more than 1.2 or low-emissivity secondary glazing. Note 9 records that the timber window concession of 1.6 or Band C ended on 14 June 2023. The 2021 edition came into force on 15 June 2022; a 2026 edition exists at https://assets.publishing.service.gov.uk/media/69c122a6cfa346b9d4704a55/ADL1_2026.pdf.
Cited in Adding an Ensuite: Cost, Layout & Plumbing, Adding Porch, All You Need To Know About Double Glazing Repairs, Annexe & Granny Flat: Cost, Planning & Rules and 169 more.
- very strong RN-OR5MMV cited
Ministry of Housing, Communities and Local Government
The official English Housing Survey chapter on housing quality. It estimates that 5% of dwellings in England, 1.4 million, had a damp problem in 2024, up from 4% in 2021 and 2022.
Cited in How to Prevent Damp In Your Home.
- very strong RN-YCPKNQ cited
Ofgem
Ofgem's guidance for property owners on BUS applications made from 28 April 2026. It explains that an EPC is optional, with other evidence accepted where there is none.
Cited in Barn & Outbuilding Conversions: Feasibility & Cost, Boiler Problems & Common Faults, Boiler Upgrade Scheme & Heating Grants 2026, Church Conversion Cost: 2026 UK Price Guide and 2 more.
- very strong RN-3RW0VR cited
Ofwat
Ofwat's guidance on water pressure: the guaranteed standards scheme requires a minimum of seven metres static head in the communication pipe serving a property; it sets no maximum.
Cited in Soundproofing Noisy Pipes & Soil Stacks.
- very strong RN-O7TO5H cited
Scottish Government (gov.scot)
SCOTLAND, with no England equivalent: a seller in Scotland must commission a Home Report before marketing, where an England seller commissions nothing and the buyer pays for their own survey. Introduced in 2008 to give buyers and sellers better information on property condition before offers are placed, to stop duplicate surveys and valuations, and to stop artificially low asking prices. The Home Report comprises three documents: an Energy Report, a Property Questionnaire and a Single Survey, and only surveyors registered with or authorised to practise by RICS may produce the Single Survey. It was developed with the Home Report Implementation Group, whose members included RICS, the Law Society of Scotland, the Council of Mortgage Lenders, the National Association of Estate Agents and Citizens Advice Scotland. A five-year review followed a December 2013 consultation and a January 2015 research report.
- very strong RN-JAOQRT cited
The National Archives
what counts as a material change of use, which is a closed list and does not include changing the use of a room inside one dwelling
Cited in Building Control: What It Is & When You Need It, Cellar Tanking & Waterproofing.
- very strong RN-IYI8NO cited
The National Archives
GPDO Part 2 Class C grants permitted development for painting the exterior of any building, except painting for advertisement, announcement or direction.
Cited in Repairing & Renewing Render.
- 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-AX21TC cited
The National Archives
Regulation 2 of the Work at Height Regulations 2005, the interpretation provision. Its definition of work at height covers any place, including at or below ground level, from which a person could fall a distance liable to cause injury, with no height threshold.
Cited in Leaking Roof: Causes, Costs & Fixes.
- 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-W0DK4I cited
The National Archives (legislation.gov.uk)
The provision that changed what a homeowner actually owes an insurer, and the correction to every article still saying you must disclose all material facts. Section 2(2) imposes a single duty on the consumer: to take reasonable care not to make a misrepresentation to the insurer. Section 2(4) states expressly that this duty replaces any duty relating to disclosure or representations by a consumer to an insurer that existed in the same circumstances before the Act applied, so the old volunteered-disclosure regime is gone for consumer insurance and the burden shifts to the insurer to ask clear questions. Section 2(3) provides that failing to comply with the insurer's request to confirm or amend particulars previously given is itself capable of being a misrepresentation, which is what catches a homeowner who ignores a renewal notice after an extension or loft conversion. In force from 6 April 2013 by S.I. 2013/450, with section 2(5) omitted from 12 August 2016 by the Insurance Act 2015.
Cited in Timber Frame vs Masonry (Brick & Block) Construction.
- very strong RN-43Q4DG cited
The National Archives (legislation.gov.uk)
The definitive list of what counts as a statutory nuisance in England and Wales, which is the legal hook for most neighbour and building-work complaints. Section 79(1) names, among others: (a) any premises in such a state as to be prejudicial to health or a nuisance, which is the route used against damp and disrepair; (b) smoke emitted from premises; (c) fumes or gases emitted from premises; (d) dust, steam, smell or other effluvia arising on industrial, trade or business premises; (e) any accumulation or deposit; (fb) artificial light emitted from premises, which covers security lighting; (g) noise emitted from premises; and (ga) noise from a vehicle, machinery or equipment in a street. Each limb requires the matter to be prejudicial to health or a nuisance. Section 79(1) also places a duty on every local authority to inspect its area for statutory nuisances and, where a person living in its area complains, to take such steps as are reasonably practicable to investigate. Section 79(1A) excludes matters caused by land being in a contaminated state, and section 79(2) excludes Crown defence premises from the smoke, artificial light and noise limbs.
Cited in Security Lighting & PIR Sensors.
- very strong RN-QBUTY2 cited
The National Archives (legislation.gov.uk)
The exact wording of the two excavation triggers that decide whether a basement or a deep foundation needs a party wall notice, worth quoting rather than paraphrasing. Section 6(1) applies where the building owner proposes to excavate, or excavate for and erect a building or structure, within a distance of 3 metres measured horizontally from any part of a building or structure of an adjoining owner, and the excavation will within those 3 metres extend to a lower level than the level of the bottom of the neighbour's foundations. Section 6(2) applies within 6 metres measured horizontally where the work will within those 6 metres meet a plane drawn downwards in the direction of the excavation at an angle of 45 degrees to the horizontal. Section 6(5) requires the building owner to serve notice on the adjoining owner at least one month before beginning to excavate. Section 6(7) provides that if the adjoining owner does not serve a notice indicating consent within 14 days, they are deemed to have dissented and a dispute has arisen, which is what triggers the surveyor and award process.
Cited in Basement & Cellar Conversions: Cost, Basement Conversion Cost & Feasibility (UK), Bedroom Extension Cost: 2026 UK Price Guide, Build Basement Cost: 2026 UK Price Guide and 28 more.
- very strong RN-GB6G0C cited
The National Archives (legislation.gov.uk)
Regulation 10 of the Fire Safety (England) Regulations 2022. It applies to buildings with two or more sets of domestic premises and sets 3-monthly communal and 12-monthly flat entrance door checks above 11 m.
Cited in Fixing Doors That Stick or Drop.
- 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: 2026 UK Cost Guide.
- very strong RN-U95SAB cited
The National Archives (legislation.gov.uk), UK Public General Act 1981 c.69
The law behind the advice not to cut hedges or strip ivy and soffits in the nesting season. Section 1(1) makes it an offence to intentionally (a) kill, injure or take any wild bird, (b) take, damage or destroy the nest of any wild bird while that nest is in use or being built, or (c) take or destroy an egg of any wild bird. Section 1(2) creates a possession offence for a live or dead wild bird, any part of or thing derived from one, or an egg or part of an egg. Section 1(5) adds a higher tier of protection for Schedule 1 species, making it an offence to intentionally or recklessly disturb such a bird while it is building a nest or is in, on or near a nest containing eggs or young, or to disturb its dependent young. The prohibition is tied to the nest being in use, not to a fixed calendar window, which is why guidance points at the main March to August season but does not treat it as a safe harbour.
Cited in Barge Boards, Fascias & Soffits: Cost & Replacement, Garden Maintenance Cost: 2026 UK Price Guide, Hedge Trimming Cost: 2026 UK Price Guide.
- very strong RN-KXCXCY cited
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.
- strong locally RN-UPMQ50 cited
Ashfield District Council
A council's table of daily water vapour sources in an average house, giving about 4.5 litres a day from drying laundry out of roughly 15.7 litres in total.
- strong locally RN-MIQHPJ cited
Cambridge City Council
A council environmental health page on removing old lead paint at home. It recommends liquid strippers or a hot-air gun below 450C and wet abrasive paper instead of dry sanding.
Cited in Fixing Doors That Stick or Drop, Grab Adhesive & Construction Adhesives, Wallpaper Types & Hanging Basics.
- strong locally RN-J3C4HI cited
South Kesteven District Council
A council's damp and mould advice giving about 12 litres of moisture a day for an average household, and over 20 litres a day where clothes are dried indoors.
- strong RN-RIEVFH cited
BRE (Building Research Establishment)
The free BRE article that explains the crack category system a surveyor will actually use, published 15 April 2014 by Rupert Pool. It records that BRE assessed 130 properties that had suffered subsidence in order to help building surveyors identify when ground movement had occurred and when structural intervention was necessary, and that the study produced the six crack categories published in BRE Digest 251, linking crack width and number to the appropriate repair. The working interpretation it gives is the citable part: categories 0, 1 and 2, with crack widths up to 5mm, are aesthetic issues needing only redecoration; categories 3 and 4 are serviceability issues affecting the weather-tightness of the building and the operation of doors and windows; and category 5 is a stability issue likely to require structural intervention. It is explicit that this is a simplification, that other factors including whether crack widths are increasing over time affect the classification, that Digest 251 itself should be consulted for any assessment, and that a building professional should be consulted where damage is significant. It also notes that subsidence insurance claims have historically risen after periods of very dry weather.
Cited in Cracks in Walls: When to Worry, How to Fill Cracks Before Painting, Underpinning: When You Need It & Cost.
- strong RN-BHTZZ6 cited
BRE Electronic Publications
The primary document behind every crack category a surveyor quotes, and the reference a note should name rather than repeating the categories second hand. Digest 251 was written by R Driscoll, published by BRE with a publication date of 01 January 1995 for the revised edition, ISBN 1860810454, and runs to 8 pages. Its description states that it discusses the assessment and classification of visible damage resulting from structural distortion, and that it includes a table classifying cracks from category 0, hairline cracks of less than about 0.1mm width, to category 5, cracks usually greater than 25mm width. Its indexed keywords are cracks, distortion, bulge, foundation movement and subsidence. The store page also notes that the two photographs of wall cracking scanned poorly into the PDF and may need contrast adjustment. Those two anchor figures, 0.1mm at category 0 and 25mm at category 5, are the ones a cracks note can cite with confidence.
Cited in Cracks in Walls: When to Worry, Hardcore, MOT Type 1 & Sub-base Materials Explained.