Room by Room
76 sources in the library on room by room, 18 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 2.
- very strong RN-AW0FCY cited
Ministry of Housing, Communities and Local Government
The second volume of Approved Document B, needed when a homeowner project crosses out of purely domestic use. Paragraph 0.1 draws the line: Volume 1 deals solely with dwellings INCLUDING blocks of flats, so a flat conversion stays in Volume 1, while Volume 2 covers every other building type. Table 0.1 sets the purpose groups: 1(a) flat, 1(b) dwellinghouse with a habitable storey at least 4.5m above ground up to 18m, 1(c) dwellinghouse with no habitable storey 4.5m above ground, then 2(a) residential institutional, 2(b) residential other (hotel, boarding house, hall of residence, hostel), 3 office, 4 shop and commercial, 5 assembly and recreation, 6 industrial, 7(a) storage and 7(b) car parks for vehicles up to 2,500kg gross. Its notes keep work within purpose group 1: surgeries, consulting rooms or offices forming part of a dwellinghouse and used by an occupant in a professional capacity stay in group 1 provided they total no more than 50m2, and a detached garage or open carport of no more than 40m2 stays in group 1(c). Paragraph 0.21 requires a separate purpose group for an ancillary use if that use is a flat, or if the building or compartment exceeds 280m2 and the ancillary use is more than one fifth of the total floor area; paragraph 0.22 requires separate purpose groups for genuinely independent uses such as shops with offices above, and the more onerous guidance applies where there is doubt. Paragraphs 0.23 and 0.24 require Volume 1 to be consulted as well for mixed use buildings that include dwellings, and paragraph 3.2 requires separate escape routes, or other effective protection of common escape routes, where a building has storeys or parts of storeys in different purpose groups.
Cited in Carpet Tile Installation Cost: 2026 UK Price Guide.
- 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 35 more.
- very strong RN-35VE7W cited
Ministry of Housing, Communities and Local Government
Table 0.1a sets separating element performance for dwellings: purpose built walls a minimum 45 dB DnT,w + Ctr, floors and stairs 45 dB airborne and a maximum 62 dB L'nT,w impact; where a dwelling is formed by material change of use the figures relax to 43 dB airborne and 64 dB impact. Table 0.2 sets the laboratory value for new internal walls and floors within a dwelling at a minimum 40 dB Rw. Requirement E2 covers internal walls between a bedroom or a room containing a WC and other rooms, and internal floors, but expressly does not apply to an internal wall containing a door, a wall separating an en suite toilet from its own bedroom, or existing walls and floors in a material change of use. Section 5 gives internal wall types A to D and internal floor types A to C, including timber or metal stud with plasterboard and mineral wool; paragraph 5.14 requires all gaps around internal walls to be filled.
Cited in Acoustic Insulation for Floors & Walls, Acoustic Underlay & Soundproof Flooring, Ceiling Lights: Downlights vs Pendants vs Spots, Concrete Blocks: Aircrete vs Dense vs Hollow and 11 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, Annexe & Granny Flat: Cost, Planning & Rules, Basement & Cellar Conversions: Cost, Bathroom Remodel Cost: 2026 UK Price Guide and 44 more.
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Ministry of Housing, Communities and Local Government
The 2026 edition of Approved Document F Volume 1, supporting Requirement F1 and regulations 39, 40C, 42 and 44. It takes effect on 24 March 2027 in England for building work not connected with higher-risk building work, and on 24 September 2027 for work in connection with higher-risk building work, with transitional arrangements in Circular Letter 01/2026. The extract rates are unchanged from the 2021 edition: paragraph 1.13 requires extract to outside in kitchens, utility rooms, bathrooms and sanitary accommodation, and Table 1.1 keeps 30 l/s for a kitchen with a cooker hood extracting outside, 60 l/s where there is no hood or the hood does not extract outside, and 30 l/s for a utility room. Paragraph 1.16 keeps extract terminals within 400 mm of the ceiling and 1.17 keeps the cooker hood 650 to 750 mm above the hob. Paragraph 1.11 states background ventilator sizes are given as an equivalent area in mm2, not free area, measured to BS EN 13141-1, and 1.12 requires that equivalent area to be marked visibly from inside.
Cited in Trickle Vents & Background Ventilation.
- very strong RN-YAW64M cited
Ministry of Housing, Communities and Local Government
Requirement G3(4) states the hot water supply to any fixed bath must be designed so the water delivered to that bath cannot exceed 48 degrees C; paragraph 3.65 says this is achieved with an in-line blending valve or other temperature control device with a maximum temperature stop, and 3.66 accepts valves to BS EN 1111:1999 or BS EN 1287:1999 that fail safe. G3(3) requires unvented storage vessels to prevent stored water exceeding 100 degrees C and to convey safety discharge somewhere visible and safe. Regulation 36 and Requirement G2 cap potential consumption in a new dwelling at 125 litres per person per day, or the optional 110 litres per person per day where a planning condition specifies it; G2 applies only to dwellings erected or formed by material change of use. Sections G4 sanitary conveniences, G5 bathrooms and G6 food preparation areas set scale of provision.
Cited in Boiler Replacement & Central Heating Costs (UK), Reseal Bath Cost: 2026 UK Price Guide.
- very strong RN-XH6E39 cited
Ministry of Housing, Communities and Local Government
The standard that decides whether a loft ladder is legal and when a raised deck needs a balustrade. Published 3 January 2013, it covers protection from falling, collision and impact including stairs, ladders, ramps, guarding and vehicle barriers. Paragraph 1.31 states that retractable ladders must not be used as a means of escape. Paragraph 1.32 permits a fixed ladder, with fixed handrails on both sides, only for access in a loft conversion containing one habitable room, and only where there is not enough space without altering the existing space for a compliant stair, which is the rule that catches most loft ladder installations. Paragraph 1.29 restricts alternating tread stairs to loft conversions. For a private stair the maximum pitch is 42 degrees (Table 1.1 note 1), the normal relationship between rise and going is twice the rise plus the going between 550mm and 700mm, and for dwellings external tapered steps forming part of the building need a going of at least 280mm. Paragraph 3.1 requires guarding wherever it is reasonably necessary for safety at the edge of a floor, gallery, balcony, roof, light well, basement or similar sunken area. Paragraph 3.2 requires guarding to be at least the height in Diagram 3.1, allows any wall, parapet or balustrade to serve as guarding, and requires it to resist the loads in BS EN 1991-1-1 with its UK National Annex and PD 6688-1-1, with BS 6180 for barrier and infill panel design. Handrails should be positioned 900mm to 1000mm from the pitch line or floor.
Cited in All You Need To Know About Double Glazing Repairs, Basement & Cellar Conversions: Cost, Bifold Doors: Cost, Sizes & Alternatives, Blown Window Repair Cost: 2026 UK Price Guide and 41 more.
- very strong RN-5IVIKF cited
Ministry of Housing, Communities and Local Government
Paragraph 1645 of the M4(2) guidance requires a minimum 1,200 mm clear space in front of and between all kitchen units and appliances in living, kitchen and eating areas. Wall switches, socket outlets, stopcocks and controls must have their centre line between 450 mm and 1,200 mm above floor level (Diagram 1.5), consumer units are mounted with switches 1,350 to 1,450 mm above floor level, and boiler timer controls and thermostats between 900 mm and 1,200 mm. Communal approach routes and flights need a minimum clear width of 1,200 mm and every landing a minimum 1,200 mm clear of any door swing. Handrail guidance is measured 450 mm above the pitch line of the treads.
Cited in Bathroom Layouts & Planning, Bathroom Storage Solutions, Bathroom Tiles: Types, Cost & Layout, Choosing Paint Colours: A Practical Guide and 12 more.
- very strong RN-R7QZ7M cited
Ministry of Housing, Communities and Local Government
Supports Part O of Schedule 1 to the Building Regulations 2010 (requirement O1 and regulation 40B); the 2021 edition took effect on 15 June 2022 in England, with transitional relief for work notified before that date and started before 15 June 2023. Critically, paragraph 0.3 limits the guidance to NEW residential buildings only (dwellings, residential institutional and residential other, plus shared communal rooms, common spaces and live/work units), and paragraph 0.7 applies it only to the residential parts of mixed-use buildings. Compliance is by the simplified method (Section 1) or dynamic thermal modelling to CIBSE TM59 (Section 2); the simplified method splits England into a high risk location (urban and some suburban London listed in Appendix C, with guidance for parts of central Manchester) and a moderate risk location (the rest of England). Table 1.1 (cross-ventilated) caps glazing as a percentage of floor area at north 15 high risk / 18 moderate, east 18/18, south 15/15, west 18/11, with the most glazed room capped at north 37/37, east 37/37, south 22/30, west 37/22. Table 1.2 (no cross-ventilation) caps glazing at north 15/18, east 11/18, south 11/15, west 11/11, most glazed room north 26/26, east 18/26, south 11/15, west 18/11.
Cited in Glazed Extensions: The Complete UK Guide, Glazing Explained: U-values, Low-E, Argon & Spacers, Rooflights & Skylights: Materials & Types.
- very strong RN-JYJ3I5 cited
Ministry of Housing, Communities and Local Government
The document that decides what electrical work a homeowner may legally do themselves, and the exact list of notifiable jobs. Regulation 12(6A), reproduced at paragraph 2.5, makes only three things notifiable: the installation of a new circuit, the replacement of a consumer unit, and any addition or alteration to existing circuits in a special location. Regulation 12(9) defines special location as, in a room containing a bath or shower, the zone extending vertically from finished floor level to 2.25 metres (or the shower head position if higher) and horizontally 600mm from the edge of the bath tub or shower tray. Paragraph 2.7 states that all other electrical installation work is not notifiable, namely additions and alterations to existing installations outside special locations, and replacements, repairs and maintenance anywhere. Paragraph 2.8 gives worked examples: a built-in cooker is not notifiable unless a new cooker circuit is needed, and connecting an electric gate or garage door to an existing isolator is not notifiable but running a new circuit from the consumer unit to that isolator is. Paragraph 2.2 confirms Part P reaches outdoor work including fixed garden lighting, pond pumps and outbuildings such as sheds, detached garages and domestic greenhouses. Notifiable work must be certified by self-certification by a registered competent person, third-party certification, or a building control body (paragraph 3.1), with the compliance certificate issued within 30 days (paragraph 3.4). Note that Approved Document P is a source of guidance rather than a ban: non-notifiable work still has to comply with BS 7671.
Cited in Adding an Ensuite: Cost, Layout & Plumbing, Adding Plug Socket Room Cost: 2026 UK Price Guide, Annexe & Granny Flat: Cost, Planning & Rules, Bathroom Layouts & Planning and 76 more.
- very strong RN-70QMAN cited
Ministry of Housing, Communities and Local Government
The source that kills the widespread claim that Building Regulations set a minimum ceiling height in England. The gov.uk page states the standard is not a building regulation and remains solely within the planning system as a new form of technical planning standard, applied only where a local authority has adopted it in its Local Plan. The March 2015 standard itself (ISBN 978-1-4098-4567-6) sets Gross Internal Area minimums by bedrooms and bedspaces (3b4p notation) in Table 1, organised by storey height, and at paragraph 10(i) sets the minimum floor to ceiling height at 2.3m for at least 75% of the Gross Internal Area. Paragraph 2 records that the bedroom, storage and internal area requirements have no other statutory meaning or use. It also gives the counting rules: storage under stairs with 900 to 1500mm headroom counts at 50% of floor area and anything under 900mm not at all. Applies to new dwellings, not to extensions of existing houses.
Cited in House Extension Design Ideas.
- very strong RN-ZAFBT8 cited
Planning Portal
Sets out the conditions under which a conservatory is exempt from the building regulations: it must be single storey, less than 30 square metres in floor area, separated from the house by external quality walls, doors or windows, have an independent heating system with separate temperature and on/off controls, and have glazing and any fixed electrical installations that comply with the applicable building regulations requirements. It warns of a critical exception: any new structural opening between the conservatory and the existing house requires building regulations approval even where the conservatory itself is an exempt structure, which is the point that catches most knock-through and solid-roof conversion projects. It also cautions against building a conservatory that would restrict ladder access to windows serving rooms in a roof or loft conversion.
Cited in Conservatory Refurbishment Cost: 2026 UK Price Guide, Glazed Extensions: The Complete UK Guide.
- very strong RN-0TPE6O cited
Planning Portal
Sets the two building regulations thresholds for a detached outbuilding such as a garden office, garden room or summerhouse. Approval is not normally needed where the floor area is less than 15 square metres and the building contains no sleeping accommodation. Where the floor area is between 15 and 30 square metres, approval is still not normally needed provided the building contains no sleeping accommodation and it is either at least one metre from any boundary or it is constructed substantially of non-combustible materials. The no-sleeping-accommodation condition is emphasised in the original and applies to both bands, so a garden room intended as a guest bedroom or annexe falls outside the exemption whatever its size.
Cited in Glazed Extensions: The Complete UK Guide, Plastic Shed Cost: 2026 UK Price Guide.
- very strong RN-8B9CFW cited
Planning Portal
Establishes that a conservatory is treated as an ordinary home extension for planning, falling under the same permitted development rules in Schedule 2, Part 1, Class A of the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and that limits apply to the total enlargement including any previous extensions. It notes that work adding over 100 square metres of floor space may be liable to the Community Infrastructure Levy. The rules apply to houses only, not to flats and maisonettes, not to houses created through change of use permitted development classes G, M, MA, N, P, PA and Q or through Schedule 2 Part 20 new dwellinghouses, and not where an Article 4 Direction or planning condition removes permitted development rights.
Cited in Glazed Extensions: The Complete UK Guide.
- very strong RN-6H4YWI cited
The National Archives (legislation.gov.uk)
The regulation that carries the conservatory and outbuilding exemption itself, rather than a summary of it. Regulation 9 provides that the Building Regulations do not apply to the erection of any building or extension of a kind described in Schedule 2, which is where conservatories, porches and small detached buildings sit. It then carves back two things that still apply: the water efficiency requirements, for a greenhouse or small detached building or extension receiving a cold or hot water supply shared with or located inside a dwelling, and Part P of Schedule 1 on electrical safety, which applies to any greenhouse, any small detached building within class 6 of Schedule 2, and extensions taking electricity from a source shared with or inside a dwelling. A garden office wired from the house is therefore notifiable under Part P even when the building itself is exempt.
Cited in Glazed Extensions: The Complete UK Guide.
- strong RN-3LY0EO cited
BSI
The standard that supplies the imposed floor loading a home gym, a loft store or a mezzanine has to be checked against, and the material densities used to work out the dead load of a new floor build-up. Published 29 July 2002, current and under review, BS EN 1991-1-1 classifies actions, distinguishing self-weight from imposed loads, defines design situations, then gives densities of construction and stored materials, self-weight of construction works and imposed loads for buildings by category of use. A note that says a floor may not take a rack of weights or a large aquarium should point here, together with the UK National Annex, rather than to a rule of thumb.
Cited in Building a Home Gym: Cost & Setup (Garage or Spare Room), Skylights vs Roof Lanterns vs Roof Windows.
- strong RN-C3NSSX cited
BSI (British Standards Institution)
The code of practice behind every balustrade, balcony, landing and decking guard rail, and the standard Approved Document K points to for barrier loadings. Paywalled, so only the BSI catalogue page is public; it confirms the current edition is BS 6180:2011, published 31 March 2011, status Current but Under Review, from BSI committee B/208 and ICS 91.060.99. The catalogue page confirms it is a full revision of the 1999 edition and that the two substantive changes were the inclusion of Table 2, minimum horizontal imposed loads for parapets, barriers and balustrades, and changed rules on deflection at clause 6.4.1, so a note needing barrier load figures should cite Table 2 by name. It covers design, structure, height and strength of barriers in aluminium and copper alloys, concrete, plastic, steel, stone, wood and glass, temporary and permanent, including protective, crash and crush barriers and those imposing a speed limit up to 16 km/h. It expressly does NOT apply to spectator sports areas or buildings, construction sites, or barriers protecting children younger than 24 months.
Cited in Newel Posts, Spindles & Balustrades.
- strong RN-IKHYR0 cited
BSI (British Standards Institution)
The residential fire safety code of practice that professionals use as the alternative to the Approved Document B route, described by BSI as the UK most widely used fire safety standard. Paywalled, so only the catalogue page is public; it confirms the current edition is BS 9991:2024, page-dated 24 September 2025, status Current, and that it superseded BS 9991:2015, which was withdrawn on 21 November 2024, which in turn superseded BS 9991:2011, withdrawn 31 October 2015. Scope for the 2024 edition covers dwellings (single-family houses, self-contained flats or maisonettes), blocks of flats, residential accommodation blocks with individual bedrooms and kitchen or sanitary facilities, specialized housing and care homes. Care homes are new to the 2024 scope: the 2011 edition expressly excluded residential care and nursing homes. The earlier editions confirm the standard applies not only to new buildings but to material alterations, extensions and material changes of use of an existing building, which is why it is cited on loft conversions and flat conversions, and that it complements BS 9999, the equivalent code for non-residential buildings. The 2015 edition renamed sheltered and extra care housing as specialized housing and added expanded recommendations for escape from basements, lifts, power supplies, cluster accommodation and management of additional needs and disabilities.
Cited in PIR vs Mineral Wool Insulation Compared.
- very strong RN-IU4DJS
Building Control Northern Ireland
Sets out the legal status of Northern Ireland's Technical Booklets, which differs from how Approved Documents are often described. Under Article 3 of the Building Regulations (NI) Order 1979 the Department of Finance makes the regulations, and it publishes Technical Booklets as guidance in support of them; there is no obligation to follow the methods or standards in the booklets, and any form of construction may be adopted provided the applicant can demonstrate to the district council that the requirements are met. The page also hosts free information sheets on converting an attic, alterations to conservatories, radon in dwellings, exemptions, ventilation, energy conservation, regularisation of unauthorised work, and the BCNI Construction Details updated November 2023.
- very strong RN-Q4AIP0
Building Control Northern Ireland
Dated April 2026, this is the clearest official statement anywhere in the UK on replacing a conservatory roof with a solid or insulated one. In Northern Ireland, if the replacement roof has less than three quarters of its area translucent, a Building Control application must be made to the council before work starts, under either a Building Notice or Full Plans. The application must give details of the replacement roof structure, covering and insulation, all complying with current Building Regulations, and a structural engineer's report is likely to be required to confirm the existing conservatory structure and foundations can carry the new roof loads. It warns that many existing conservatories were built as exempt structures and were never inspected, so the existing structure and foundations should be assessed by a suitably qualified professional before committing, and that necessary upgrading could prove prohibitive in cost and disruption.
- very strong RN-7M23NG
Building Control Northern Ireland
Northern Ireland's conservatory and outbuilding exemptions, which are stricter than England's and must not be conflated with them. A conservatory is exempt only if built at ground level, under 30 square metres, glazed to Part V for safety glass, thermally separated from the dwelling, with not less than 75 per cent of the roof area and not less than 50 per cent of the wall area in translucent material, with the house heating or cooling system not extended into it and no fixed combustion or cooling appliance installed. A porch is exempt on similar terms with a floor area under 5 square metres. A small detached building is exempt if single storey, under 30 square metres, with no sleeping accommodation and substantially non-combustible; if built of combustible materials such as timber walls and felt roof it must be at least 1.0 m from the dwelling, the road and the boundary. Version dated June 2024.
- very strong RN-4ATLE5
Building Control Northern Ireland (the 11 district councils)
NORTHERN IRELAND. The Northern Ireland Building Regulations are made by the Department of Finance and administered by the 11 DISTRICT COUNCILS, so there is no private sector alternative: Northern Ireland has no approved inspectors and no registered building control approvers, and the England route of appointing a private building control body simply does not exist. The page lists the Building Regulations (Northern Ireland) 2012 with the amending regulations of 2014, 2016 and 2022, and links the current and historical Technical Booklets plus the contraventions and appeals route. The regulations are intended to secure the safety, health, welfare and convenience of people in and around buildings and to further the conservation of fuel and energy. The site names all 11 councils including Belfast City, Derry City and Strabane, Lisburn and Castlereagh, Newry Mourne and Down, Mid Ulster and Fermanagh and Omagh.
- very strong RN-Y4IPA0
Department of Finance (Northern Ireland)
Northern Ireland's accessibility rules for a dwelling's sanitary provision, October 2012. Section 10 requires a water closet in the entrance storey, or the principal storey, reachable from the habitable rooms of that storey without negotiating a stair; where a bathroom exists on that storey the WC may sit inside it. Paragraph 10.2 requires a clear space of not less than 900 mm by 750 mm at the WC for a person with a disability, and allows the washbasin to project into that space provided it does not impede access; frontal access centres the space on the pan, oblique access offsets it towards the approach. Paragraph 10.4 requires the doorway to be positioned so a wheelchair user can reach the clear space and, for oblique access, that the door edge is not in front of or 250 mm behind the WC unless there is room to manoeuvre. Paragraph 10.5 requires the door to open outwards or not to impinge on the clear space at any point of its swing. Table 10.1 sets clear opening widths against circulation route width: 750 mm head on from a 900 mm route, 750 mm not head on from 1200 mm, 775 mm not head on from 1050 mm, 800 mm not head on from 900 mm. Section 11 covers socket outlet and switch heights.
- very strong RN-6PQK9U
UK Health Security Agency (UKradon)
UKHSA recommends that radon levels be reduced in homes where the average exceeds 200 becquerels per cubic metre, the Action Level, and states that this recommendation is endorsed by Government. The Action Level refers to the annual average concentration, so a valid measurement uses two detectors, one in a bedroom and one in a living room, left in place for three months to average out short-term fluctuations. Separately defines a Target Level of 100 Bq per cubic metre as the ideal outcome of remediation in existing buildings and of protective measures in new buildings, and advises that where a result falls between the Target and Action Levels action to reduce the level should still be considered, especially where a smoker or ex-smoker lives in the home. Radon is described as a colourless, odourless radioactive gas formed by decay of naturally occurring uranium in rocks and soils.
- very strong RN-B3IMK7
UK Health Security Agency (UKradon)
UKHSA's routing page into radon guidance written for the four audiences a renovation note serves, and the place to send a builder who needs the building regulations position on radon protective measures in a new floor. It separates guidance for householders, covering radon and house sales, health risks and how to measure; for employers, covering the health and safety duty to test a workplace; for professionals, explicitly including builders who need building regulations guidance and solicitors handling property transactions; and for local authorities and housing associations, including how to check whether housing stock sits in a radon Affected Area. It also carries the address search and the domestic and workplace measurement packs.
- very strong RN-JHFWQB
World Health Organization Regional Office for Europe
Published 15 October 2009, ISBN 9789289041737, the health-based benchmark for night-time noise that a soundproofing or acoustic glazing note can cite for what level of quiet is worth achieving. Using Lnight,outside as defined in the Environmental Noise Directive 2002/49/EC, it sets an Lnight,outside of 40 dB as the target of the night noise guideline to protect the public including the most vulnerable groups, named as children, the chronically ill and the elderly. It recommends an Lnight,outside of 55 dB as an interim target for countries that cannot achieve the guideline in the short term and adopt a stepwise approach. The guidelines were agreed by a working group of experts with industry, government and non-governmental stakeholders in December 2006, and extend and update the WHO Guidelines for community noise of 1999.
- very strong RN-33L9HJ
GOV.UK
The council grant for adapting a home, and what work it can pay for. Eligibility covers physical disability, learning disability, age-related needs, autism, cognitive impairment such as dementia, a progressive condition such as motor neurone disease, terminal illness and mental health conditions. The listed works are wide enough to cover substantial building work: widening doors and installing ramps or grab rails, improving access to rooms and facilities with a stairlift or level access shower, improving access to the garden, building an extension such as a downstairs bedroom, providing a heating system suitable for the applicant's needs, and adapting heating or lighting controls. Confirms a Disabled Facilities Grant does not affect any other benefits the applicant receives.
- very strong RN-JPYSJ1
GOV.UK
Carries the maximum grant by nation, which differs across the UK and is the figure most articles quote wrongly. England up to 30,000 pounds, Wales up to 36,000 pounds, Northern Ireland up to 25,000 pounds, and in Scotland Disabled Facilities Grants are not available at all, with support instead provided through equipment and adaptations schemes. Some councils may give more. The award is means tested on household income and household savings over 6,000 pounds, but disabled children under 18 can get a grant without their parents' income being taken into account, and landlords can get one without their income and savings being assessed, though the council may require the property to be let to another disabled person if the tenant moves within 5 years. Warns that starting work before the council approves the application may mean no grant at all. Payment is either in instalments as work progresses or in full on completion, paid to the contractor directly or through the applicant, and where the applicant or a relative does the work the council will normally only accept invoices for materials or services bought.
- very strong RN-K69RBW
GOV.UK / Valuation Office Agency
States that you do not usually have to pay business rates for a home-based business if you use a small part of your home for the business, for example using a bedroom as an office, or if you sell goods by post. It sets out when you may have to pay business rates as well as council tax: where the property is part business and part domestic, for example living above a shop; where you sell goods or services to people who visit the property; where you employ other people to work at the property; or where you have made changes to your home for the business. It directs the reader to contact the Valuation Office to find out whether they should be paying business rates. This is the citation a home office or garden office note needs before it tells a reader to fit out a room for client visits.
- very strong RN-60960T
Health and Safety Executive
The regulator's position on a home office, which a note about converting a spare room or garden room for work should reflect. The Health and Safety (Display Screen Equipment) Regulations apply to workers who work at home permanently or long term and to those routinely splitting time between workplace and home, and a person is a DSE user if they work on display screen equipment daily for continuous periods of an hour or more. The regulations do not apply to occasional or short-period home use. Where they apply the employer must carry out a DSE assessment for individual workers, which can usually be a trained self-assessment without a home visit, must cover both home and office where both are used, and must be followed by risk reduction so far as reasonably practicable. It also notes workers may not need office furniture to achieve a comfortable sustainable posture, but their own equipment must be checked as suitable.
- very strong RN-YP8R7O
HM Revenue and Customs
The five conditions that must all be met for a sale to be free of Capital Gains Tax under Private Residence Relief, two of which renovation choices can break. You must have one home and have lived in it as your main home for the whole period of ownership; you must not have let part of it out, though having a lodger does not count; you must not have used part of the home exclusively for business purposes, and using a room as a temporary or occasional office expressly does not count as exclusive business use; the grounds including all buildings must be less than 5,000 square metres, just over an acre; and you must not have bought it just to make a gain. Where all apply the relief is automatic and no tax is due; where any fails there may be tax to pay. Married couples and civil partners can only count one property as their main home at any one time. The exclusive-business-use point is what a dedicated garden office or converted consulting room can trigger.
- very strong RN-M9H2XK
Ministry of Housing, Communities and Local Government
Non-statutory guidance published 13 July 2026 and updated 31 July 2026 when the PDF was replaced by an HTML version, applying to England, issued as an annex to the Awaab's Law Phase 2 guidance for social landlords. Its key date is that Phase 2 of Awaab's Law comes into effect on 30 November 2026, which extends the duty beyond the damp and mould and emergency hazards of Phase 1 to a wider set of hazards. The document sets the thresholds a social landlord uses to triage each hazard, which is the practical test of whether a reported defect starts the statutory repair clock. Useful for distinguishing what social tenants can require of a landlord from what a private homeowner or private tenant can, since Awaab's Law applies to the social rented sector.
- very strong RN-0RWQTJ
Ministry of Housing, Communities and Local Government
Statutory guidance published 23 June 2026, applying to England, issued under section 9 of the Housing Act 2004, which local authorities must have regard to when assessing hazards, and which replaces the previous operating guidance issued in 2006. The critical correction it carries is the hazard count: the HHSRS now covers 21 potential hazards, not the 29 in the 2006 guidance, and Part 2 contains a hazard profile for each of the 21. Confirms that a local authority must take enforcement action where it finds a category 1 hazard and has a power, not a duty, to enforce category 2 hazards. Issued in three parts: Part 1 an introductory guide (24 pages) on the theory, principles and assessment process; Part 2 a technical guide for assessors (174 pages) with the hazard profiles; Part 3 a supplementary guide to the hazard of fire and explosions (66 pages).
- very strong RN-XMTR5S
Ministry of Housing, Communities and Local Government
The stable gov.uk landing page for Approved Document O, Overheating, 2021 edition, in force for England. It carries the free-area requirements a note would cite from Section 1: for cross-ventilated buildings the total minimum free area is the greater of 6% of floor area or 70% of glazing area in a high risk location, and the greater of 9% of floor area or 55% of glazing area in a moderate risk location (Table 1.3); without cross-ventilation it is the greater of 10% of floor area or 95% of glazing area (high risk) and 12% or 80% (moderate) (Table 1.4). Bedroom minimum free area is 13% of the room floor area in high risk locations and 4% in moderate. In high risk locations, glazing facing between north-east and north-west via south also needs shading by external shutters with ventilation, glazing with a maximum g-value of 0.4 and minimum light transmittance of 0.7, or overhangs with a 50 degree altitude cut-off on due south facades only; internal blinds, curtains and tree foliage may not be counted (paragraphs 2.8 and 2.9).
- very strong RN-LFIIEJ
Ministry of Housing, Communities and Local Government
the nationally described space standard, which sets the minimum gross internal areas, bedroom sizes, built-in storage and, at paragraph 10(i), the minimum floor to ceiling height of 2.3m over at least 75% of the gross internal area that a local plan may require of new homes
- very strong RN-ZM5DZM
Ministry of Housing, Communities and Local Government
The landing page for the 2019 research, published 1 October 2019 and applying to England, hosting the 87 page 3.97 MB report. States the primary aim was to evaluate whether the ventilation provisions recommended in the 2010 edition of Approved Document F provide satisfactory indoor air quality in new homes, with a secondary aim of establishing the extent to which installed systems comply with the minimum ADF provisions. Its headline conclusion is the one to cite: the study found poor indoor air quality in a number of the monitored homes, and failure to meet indoor air quality indicators corresponded in all cases with failure to meet the ADF ventilation recommendations, so the shortfall lay in installation and commissioning rather than in the standard itself.
- very strong RN-W3L96O
Ministry of Housing, Communities and Local Government
An 87 page field study published 1 October 2019 measuring what installed ventilation actually delivers, and its numbers demolish the assumption that a new or upgraded system performs as designed. Of 25 homes visited with continuous mechanical extract, only one met Approved Document F guidance on both extract fan air flow rates and trickle ventilator provision, with whole dwelling extract flow rates in normal low-rate mode ranging from 85 per cent below to 8 per cent above the recommended rate. Only half the homes met the minimum trickle ventilator areas, ranging from 60 per cent below to 107 per cent above the recommended area. On two of three dMEV development sites trickle ventilators had been fitted in the same rooms as the extract fans, contrary to ADF guidance, which can stop fans drawing air through the whole house. On air quality: 11 per cent of the limited monitoring sample had a room where weekly average relative humidity exceeded the recommended monthly average, always the bedroom, and condensation or mould was reported in each such room; 30 per cent exceeded the derived carbon dioxide guideline in the bedroom; and 60 per cent of the detailed monitoring sample exceeded the ADF total volatile organic compound performance standard. Ventilation was found adequate for nitrogen dioxide and carbon monoxide but not for moisture, body odour and VOCs. Notes that Part F 2010 introduced a legal requirement to test and commission installed fans and for the installer to notify the building control body of commissioning and air flow rates.
- very strong RN-DIXAZ8
Planning Portal
The Planning Portal's working-from-home page for garden offices. It confirms that building regulations do not normally apply to a small detached building where the floor area is less than 15 square metres and it contains no sleeping accommodation, and states that the rules governing outbuildings apply to sheds, greenhouses and garages as well as garden offices. It carries the standard caveats that additional local rules may affect what permissions are needed and that the guidance relates to the planning regime for England only, which matters for a note aimed at readers across the UK.
- very strong RN-MX6K3L
Planning Portal
The four questions that decide whether a home office needs planning permission in England, and the answer a note should give instead of a flat yes or no. Permission is not required if no material change of use occurs, but it will probably be needed if the home will no longer be used mainly as a private residence, if the business causes a marked rise in traffic or callers, if it involves activities unusual in a residential area, or if it disturbs neighbours at unreasonable hours or creates nuisance such as noise or smells. Where there is doubt, the route is a Certificate of Lawful Use for the proposed activity, or an application to change the use. The page also notes that converting a box room, loft room or garage should be checked for natural light, desk space and connectivity, and points to the outbuildings rules for a garden office.
- very strong RN-RR0BKS
Scottish Government
The Scottish rules that fix how small a kitchen may lawfully be, which have no direct English equivalent. Standard 3.11 requires a kitchen to have space for a gas, electric or oil cooker, or a solid fuel cooker designed for continuous burning, plus kitchen storage of at least 1 cubic metre. Manoeuvring space within the kitchen must be a 1.5 m by 1.5 m square or an ellipse of 1.4 m by 1.8 m, with a clear entry space 1.1 m long by 800 mm wide and access at least 800 mm wide to controls. Activity spaces need at least 1.8 m headroom. An enhanced apartment must be at least 12 square metres with both length and width at least 3.0 m. Drying provision is 1.7 m of outdoor clothes line per bedroom where reasonably practicable, or an indoor space of at least 1 cubic metre with no dimension less than 700 mm. Sanitary fittings themselves are counted under standard 3.12, not here.