Loft Conversions
122 sources in the library on loft conversions, 6 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 2 of 4.
- supplier figure RN-B8F6NR cited
Saniflo UK
Saniflo's product page for the SaniAccess 3 macerator: discharge through 22, 28 or 32 mm pipe, pumping up to 5 m vertically or 100 m horizontally.
- supplier figure RN-05I6FQ cited
Touchstone Lofts
The same contractor's page on converting bungalow lofts, which gives its average cost for a dormer conversion on a bungalow as £35,000 to £55,000.
Cited in Dormer Bungalow Conversions: Adding a Room to a Bungalow.
- supplier figure RN-ORUQSD cited
VELUX
The manufacturer's data sheet for its top-hung GPU roof window; its size chart flags which sizes suit emergency escape, which its centre-pivot GGU sheet does not.
Cited in Loft Conversion Windows & Skylights: Complete Guide.
- supplier figure RN-INIP52 cited
VELUX
VELUX's UK conservation roof window page describes slim black profiles designed with conservation officers and a finish that sits flush to the slates, which settles the lower, slimmer profile of conservation rooflights.
Cited in Loft Conversion Windows & Skylights: Complete Guide.
- supplier figure RN-3OZMMM cited
VELUX
The roof window maker's product page. It recommends roof window area of 15 to 20 per cent of the floor area for a well-lit room.
Cited in Roof Window Sizes Explained (Velux Codes), Small Loft Conversion Ideas (Low Head Height & Tight Spaces).
- supplier figure RN-HF2FVE cited
VELUX
The manufacturer's own size code table, the only reliable source for what a Velux code means. Pitched roof window codes and dimensions include FK06 at 66cm by 118cm, MK04 at 78cm by 98cm, MK06 at 78cm by 118cm, MK08 at 78cm by 140cm, PK06 at 94cm by 118cm, PK08 at 94cm by 140cm, SK06 at 114cm by 118cm, SK08 at 114cm by 140cm, UK04 at 134cm by 98cm and UK08 at 134cm by 140cm. Flat roof window sizes run from 60cm by 60cm up to 150cm by 150cm and 200cm by 100cm. The first letter pair gives the width band and the digits the height, which is the pattern a size-code note should explain.
Cited in Average Loft Conversion Cost: Real 2026 Breakdown by Type, Loft Conversion Ideas: Bedrooms, Bathrooms & Home Offices, Loft Conversion Mistakes to Avoid, Loft Conversion Windows & Skylights: Complete Guide and 5 more.
- very strong RN-1Z09OS
Building Control Northern Ireland (the 11 district councils)
NORTHERN IRELAND. The scale of building control fees is set centrally by the Department of Finance under the Building (Prescribed Fees) Regulations (Northern Ireland) 1997 as amended in 2013 and 2022, with the current fees applying to applications made after 1 April 2022. Unlike England, where each authority or private approver sets its own charges, NI fees are prescribed and are not subject to annual increase, being revised periodically by the Department. There is a FIXED RATE plan fee for certain domestic extensions, detached domestic buildings such as garages, roofspace conversions and houses up to 250 square metres. For small extensions UNDER 20 SQUARE METRES the plan fee also covers all subsequent site inspections, so there is no separate inspection charge. Other work is charged on an estimated cost of works basis using a contractor's cost. Where part of the works is solely for a person with a disability that part is excluded from the fee calculation, and a full exemption applies where the works are exclusively for a person with a disability or are described as exempt. A fee calculator is provided.
- very strong RN-6YOSOS
Department of Finance (Northern Ireland)
Northern Ireland's stair geometry, and the booklet to cite when a loft is being reached by anything other than a folding ladder. October 2012 guidance to Part H. Regulation 54 defines a ladder as a fixed ladder with a flight pitched at more than 55 degrees, which is what separates a ladder from a stair. Paragraph 3.5 sets the pitch rule: twice the rise plus the going, 2R + G, should be between 550 mm and 700 mm. A private stair should have a rise of not less than 150 mm and not more than 170 mm with a going of not less than 280 mm and not more than 425 mm; a flight should have not fewer than 2 rises and no more than 12 rises where the going is under 350 mm, or 18 rises where the going is 350 mm or more. Clear headroom is not less than 2000 mm over the full length and width, but for roofspace conversions where 2000 mm cannot be achieved, Diagram 3.2(b) allows not less than 1900 mm at the centre of the stair width reducing to not less than 1800 mm at the side. Table 3.2 sets minimum unobstructed flight widths: 600 mm for a private stair serving one room only, not being a kitchen or living room, or serving a bathroom and WC; 800 mm otherwise; 900 mm where it forms part of the entrance or principal storey circulation route; 1000 mm for a common stair. Landings must be not less than 1200 mm unobstructed.
- 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-78SSH6
Department of Finance (Northern Ireland)
NORTHERN IRELAND, giving a fourth set of U-values distinct from England, Wales and Scotland. Table 2.2 sets limiting area-weighted average U-values in W/m2.K with a maximum permitted at any point in brackets: wall 0.18 (0.60), floor 0.18 (0.60), roof 0.16 (0.30), party wall 0.00 (0.60), and windows, roof windows, glazed rooflights, curtain walling and pedestrian doors 1.40 (3.00). Where the space heating source is underfloor heating the maximum floor U-value tightens to 0.15. Compare Wales at 0.13 for roofs and Scotland at 0.12, against NI's 0.16. Paragraph 2.43 limits the extent of external doors and glazed openings in a dwelling to no more than 25 per cent of the dwelling's floor area, and the limiting air permeability is 10 m3 per hour per square metre at 50 Pa, looser than the Welsh 8.0. U-values are calculated to BRE Report BR 443. A swimming pool basin must achieve not more than 0.25.
- very strong RN-867DXN
Local Authority Building Control
LABC is the member organisation for local authority building control teams across England and Wales, and this is its homeowner entry point. It confirms that Registered Building Inspectors work in teams throughout all the local authorities in England and Wales, and it runs LABC Front Door with over 200 guides on home projects including loft conversions, garage conversions, bathrooms, extensions and self-build, plus completion certificates. Use it as the not-for-profit, independent counterweight to a contractor's account of what building control will accept.
- very strong RN-4Q310E
Ministry of Housing, Communities and Local Government
Volume 1 (Dwellings), 2019 edition, is the fire authority for loft conversions. Paragraph 2.10 sets the emergency escape window at a minimum unobstructed openable area of 0.33 square metres, a minimum 450mm height and 450mm width, and the bottom of the openable area no more than 1100mm above the floor. Paragraphs 2.21 to 2.23 require, where a new storey creates a floor above 4.5m, fire resisting doors of minimum E 20 and partitions of minimum REI 30 throughout the escape route, with a sprinkler-based alternative. Paragraph 5.4 requires new loft floors to achieve REI 30 and the existing first storey R 30, relaxed only where one storey containing at most two habitable rooms and no more than 50 square metres is added.
- very strong RN-6MMER0
Ministry of Housing, Communities and Local Government
The current NPPF, published 17 August 2026 (130 pages), replacing the framework first published March 2012 and revised July 2018, February 2019, July 2021, September 2023, December 2023 and December 2024, and also replacing Planning policy for traveller sites. The single most important thing about this edition for anyone citing it: the framework has been completely restructured from continuously numbered paragraphs into lettered and numbered policies, so every existing citation of an NPPF paragraph number is now stale. The chapters are Plan-making (PM1 to 17), Decision-making (DM1 to 10), Achieving sustainable development (S1 to 6), Climate change (CC1 to 3), Homes (HO1 to 13), Economy (E1 to 4), Town centres (TC1 to 4), Communications (CO1 to 2), Clean energy and water (W1 to 4), Minerals (M1 to 6), Making effective use of land (L1 to 3), Green Belt (GB1 to 8), Well-designed places (DP1 to 4), Transport (TR1 to 8), Healthy communities (HC1 to 8), Pollution (P1 to 6), Flood risk (F1 to 9), Natural environment (N1 to 6) and Historic environment (HE1 to 10). Policy GB7(1)(b) is the one homeowners meet: the reuse, extension, alteration or replacement of an existing building is not inappropriate development in the Green Belt provided the existing building is of permanent and substantial construction, is lawful in planning terms, and any extension or alteration will not result in a disproportionate increase in size compared to the original building, with footnote 40 defining the original building as the building that existed on 1 July 1948 or, if later, as it was originally built. Policy HE5(2)(c) now defines substantial harm expressly, as where a development proposal would seriously affect a key element of a heritage asset significance, and HE4(2) requires clear and convincing justification for any harm to a designated heritage asset.
- 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-0VXMQM
Ministry of Housing, Communities and Local Government
The government guidance and template notices for the Act that governs basement digs, underpinning and work to a shared wall. It groups the notifiable work into three sections: section 1, building new on or at the boundary between properties; section 2, work to existing party walls or structures including cutting into a party wall, altering its height or depth, removing chimney breasts and rebuilding the wall; and section 6, excavation near a neighbouring building's foundations, for which the page supplies both a 3 metre notice and a 6 metre notice template. Notice periods differ by type: a section 2 party structure notice needs at least 2 months, while a line of junction notice and an excavation notice need at least 1 month. Where the adjoining owner dissents, the Act provides a dispute resolution mechanism through surveyors who settle the matter by an award. The templates are the practical value here: a note can link the exact notice a homeowner has to serve.
- very strong RN-26UWTU
Ministry of Housing, Communities and Local Government
The GOV.UK landing page for Approved Document K, published 3 January 2013, ISBN 978 1 85946 484 7, covering protection from falling, collision and impact, including the design of staircases, ladders, ramps, guarding and vehicle barriers; this edition absorbed Approved Document N on glazing and some overlapping Approved Document M guidance. Since April 2023 the Building Safety Regulator has a duty under the Building Safety Act 2022 to keep the safety and standards of all buildings in England under review, which includes advising government on Approved Document updates. The linked PDF sets the figures a loft conversion note needs: the maximum pitch for a private stair is 42 degrees (Table 1.1 note 1); the normal relationship for rise and going is twice the rise plus the going between 550mm and 700mm; means of escape routes need a minimum clear headroom of 2m except in doorways (paragraph 1.12); and paragraph 1.13 with Diagram 1.4 allows reduced headroom for loft conversions in dwellings where there is not enough space, satisfied at 1.9m at the centre of the stair width falling to 1.8m at the side. Archived editions of Approved Documents K and N are at the National Archives.
- very strong RN-B8J6OR
Ministry of Housing, Communities and Local Government (GOV.UK)
The government technical guidance that interprets Schedule 2 Part 1 of the GPDO 2015 class by class for householders in England, last updated 10 September 2019 and published as a 50 page PDF. It defines the terms the classes turn on, including original dwellinghouse, principal elevation, curtilage, article 2(3) land and the measurement conventions used for heights and depths, and it is the document local planning authorities and lawful development certificate applicants work from. Attachment PDF: assets.publishing.service.gov.uk/media/5d77afc8e5274a27cdb2c9e9/190910_Tech_Guide_for_publishing.pdf
- very strong RN-KXA7EV
Planning Portal
Confirms that a loft conversion requires new fire-resisting doors and sometimes partitions to protect the stairway, and that mains powered, interlinked smoke alarms must be provided within the stairway at each level. It states the principle behind the two-storey threshold: escape via windows is too dangerous from floors above first floor level, which is why a loft conversion over an existing two storeys needs a protected stairway rather than an escape window. It points to Approved Document B Volume 1 for the ratings and dimensions themselves.
- very strong RN-LM6OCF
Planning Portal
Sets out the two standard ways a dormer is structurally supported: rafters either side of the opening are doubled and bolted together with the dormer cheeks then built off those rafters, or the cheeks are taken all the way down to the floor and supported off the floor joists. It also notes the dormer may need to be constructed to resist fire spreading to or from a neighbouring property, which is the reason cheeks near a boundary are fire-rated.
- very strong RN-KOABS8
Planning Portal
The official statement that a permanent staircase is required: retractable ladders or stairs are not normally acceptable for a loft conversion, while space-saving stairs (alternating tread) may be acceptable where a conventional stair cannot be fitted. This is the page to cite when a note says a loft ladder cannot serve a habitable loft room. The dimensional criteria themselves (headroom, pitch, rise and going) sit in Approved Document K rather than here.
- very strong RN-GMSJMF
Planning Portal (MHCLG and TerraQuest)
Planning Portal's statement of the permitted development limits for a loft conversion, which fall under Schedule 2, Part 1, Class B of the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, covering the enlargement of a dwellinghouse by an addition or alteration to its roof. Class C governs any other alteration to the roof and Class AA governs additional storeys. Permitted development does not apply where the building contains flats or is a flat, where additional storeys have already been added under permitted development, where the house was created from a non-residential use or built as a new dwellinghouse under permitted development, or on Article 2(3) designated land. The limits are: materials similar in appearance to the existing house; total enlargement including any previous enlargement not exceeding the original roof space by more than 40 cubic metres for terraced houses or 50 cubic metres otherwise; not exceeding the height of the existing roof; not extending beyond the existing roof slope on the principal elevation where it fronts a highway; no verandas, balconies or raised platforms; no installation, alteration or replacement of a chimney, flue or soil and vent pipe; and side-facing windows obscure-glazed and, if opening, 1.7m above the floor.
- very strong RN-YBOAP5
Scottish Government
What has to happen where a party wall meets the roof, which is the first thing exposed when a loft is opened up for storage or conversion in a terrace or semi. Standard 2.2 requires separation between a dwelling and any other dwelling in different occupation, and between a dwelling and common space, to have at least a medium fire resistance duration, with a short fire resistance duration for a garage; the actual periods in minutes are set in Annex 2.A rather than in the text. Where a separating wall forms a junction with a roof it must maintain that fire resistance, and where the roof substrate is combustible the wall should project through the roof to at least 375 mm above the top surface of the roof. A separating wall of combustible construction must contain no pipes, wires or other services, so a run of cable or a loft light fed through the party wall defeats it. A roof space above a garage need not be separated from the dwelling where the garage ceiling itself serves as a separating floor with the appropriate fire resistance. Cite it before anyone boards across a party wall line or cuts into it for storage.
- very strong RN-NBV4MJ
Scottish Government
The Scottish equivalent of English competent person self-certification, and it works differently in ways every England-written note misses. Scotland uses a building warrant system under the Building (Scotland) Act 2003, with roles split between verifiers, approved building professionals (approved bodies and approved certifiers), local authorities and building owners. Certification in Scotland is optional, not the default, and covers design or construction, applying only where the work requires a building warrant; the works that can be certified are listed on the Scottish Government Certification Register, and the Scottish Government maintains the only authoritative list of registered approved building professionals. The benefit stated is that the work is certified by qualified building professionals as complying with regulations. Related guidance includes the Certification Handbook, Procedural Guidance on Certification covering what to submit with a building warrant application, and Modern methods of construction guidance for verifiers and certifiers. Applications for building warrants and completion certificates are submitted online through the eBuildingStandards.scot portal via an eDevelopment account.
- very strong RN-O86CR8
Scottish Government (gov.scot)
SCOTLAND. Paragraph 3.1.3 confirms the fee is payable at the time of application and that the verifier agrees with the applicant what drawings, specifications and other information are needed. Paragraph 3.1.4 requires a building warrant for a conversion as defined in schedule 2 of the building regulations even where no building work is proposed, which catches change of use jobs that England would treat as a material change of use under the Building Regulations 2010. Paragraph 3.1.5 requires an amendment to the warrant BEFORE work starts on any construction that departs from the approved drawings or specifications, and unamended changes can attract a building warrant enforcement notice. Offences can be reported to the Procurator Fiscal, though a building warrant enforcement notice under section 27 of the Act is the normal route, and it can only be served on the relevant person, so a builder working for a client cannot be served with one. Section 3.2 provides for pre-warrant meetings and customer agreements.
- very strong RN-69H4L9
Scottish Government (gov.scot)
The in-force Scottish handbook, 13.6 MB PDF, applying from 6 April 2026. Figures a note on Scotland needs: Standard 4.6 requires a dwelling to have at least 4 thirteen-amp socket outlets in each apartment, 6 in the kitchen of which at least 3 above worktop level in addition to any for floor standing or built-in appliances, and a further 4 anywhere in the dwelling including at least 1 in each circulation area per storey, with no equivalent requirement in England. Clause 4.6.1 requires at least one lighting point in every circulation space, kitchen, bathroom, toilet and any space of 2 m2 or more; clause 4.6.2 sets 100 lux on stair flights and landings and 50 lux elsewhere in common circulation areas. Table 3.11 sets background ventilator equivalent areas of 12,000 mm2 per apartment and 10,000 mm2 for a kitchen, utility, toilet, bathroom or shower room, doubled where ducted, with part of the ventilator at least 1.75 m above floor level. Table 3.12 sets intermittent extract rates of 30 l/s over a hob, 60 l/s elsewhere in a kitchen, 30 l/s utility, 15 l/s bathroom or shower, 6 l/s WC, with fan and background ventilator at least 0.5 m apart. Table 6.2 sets maximum U-values of 0.17 wall, 0.15 floor, 0.12 roof, 1.4 windows, roof windows and doors, 2.1 rooflights, with a Window Energy Rating or Doorset Energy Rating of B or better as an alternative for units in an existing building; for 1 or 2 matching replacement windows the frame may be disregarded if the centre pane U-value is 1.2 W/m2K or less, secondary glazing should reach about 3.5 W/m2K, and total glazed area should not exceed 25 per cent of dwelling floor area. Clause 4.8.2 requires glazing to BS 6262-4:2018 within 800 mm of floor level, in a door leaf, or within 300 mm of a door leaf and within 1.5 m of floor level, with manifestation between 850 mm and 1.0 m and between 1.4 m and 1.6 m above floor level. Clause 4.8.3 requires any window or rooflight more than 4 m above adjacent ground or floor to be cleanable safely from inside per Clause 8 of BS 8213-1:2004, from a loadbearing surface, or from a mounted access system, sets safe reach limits of 610 mm downward and an 850 mm radius arc from a point not more than 1.3 m above floor level, and bars ladder access to glazing more than 9 m above the ladder's footing.
- very strong RN-8T0SVC
Scottish Government (gov.scot)
Scotland's equivalent of the Approved Documents, and the reason a note that quotes only English rules is wrong for a fifth of the UK. This edition is in force from 6 April 2026 and applies to building warrants submitted on or after that date and to work not requiring a warrant commenced from that date. It gives guidance on achieving the standards set in the Building (Scotland) Regulations 2004, arranged in sections rather than parts: section 3 environment (ventilation, drainage, condensation), section 4 safety (electrical safety and installations, glazing and danger from accidents, including clause 4.13 which invokes PAS 24 for security), section 6 energy (U-values for windows and doors) and section 7 sustainability. Scotland uses a building warrant and a completion certificate rather than a building notice, and has no Part P competent person scheme equivalent, so electrical work is covered by the warrant system instead.
- very strong RN-NDHDXT
Scottish Government (gov.scot)
The Scottish Government's 2024 circular and the definitive class list a Scottish reader needs, because Scotland does not use the English Class A to H lettering at all. Section 4 covers dwellinghouses, meaning detached, semi-detached and terraced houses but not flats, which are dealt with in section 5. Enlargements are Class 1A single storey ground floor extensions, Class 1B ground floor extensions of more than one storey, Class 1C porches and Class 1D roof enlargements. Improvements that are not enlargements are Class 2A access ramps and Class 2B alterations within a one metre bubble. Development within the curtilage runs Class 3A ancillary buildings such as sheds, garages and greenhouses, Class 3AA storage buildings of limited dimensions such as bike sheds, Class 3B building, engineering, installation or other operations, Class 3C hard surfaces, Class 3D decking and Class 3E gates, fences and walls. Paragraph 4.3 gives the working definition of enlargement as any development increasing the internal volume of the original dwellinghouse, including an attached canopy or roof with or without walls but excluding a balcony, so a car port is an enlargement and a balcony is not.
- very strong RN-GFMJD9
Scottish Government (gov.scot)
SCOTLAND. The Scottish Government's authoritative plain-language guide to householder permitted development rights, published 28 May 2024, ISBN 9781836013143, with an errata of 20 June 2024 correcting the legislation tables for Class 1A section d on PDF page 21, Class 4B sections b and c on page 51, and paragraph 7.6 on page 73. It is the Scottish counterpart to England's Permitted Development Rights for Householders Technical Guidance and interprets the classes of Schedule 1 Part 1 of the Town and Country Planning (General Permitted Development) (Scotland) Order 1992. Paragraph 2.1 makes the owner liable for remedial action up to demolition and restoration where work fails to comply, paragraph 2.2 notes rights are disapplied or limited in conservation areas, World Heritage Sites, National Scenic Areas and National Parks, and paragraph 2.3 explains Scotland's narrow prior notification and prior approval route.
- very strong RN-84BHGV
Scottish Government (gov.scot)
SCOTLAND, and the numbering has no England equivalent: Scotland puts escape under Standard 2.9, not Approved Document B. Clause 2.9.4 requires an escape window in every apartment on an upper storey not more than 4.5 metres above the adjacent ground, and in every inner room at that height, unless there is an alternative route of escape. The escape window must have an unobstructed openable area of at least 0.33 square metres and be at least 450 mm high and 450 mm wide, with the bottom of the openable area not more than 1100 mm above the floor; the route through may be at an angle. Above 4.5 metres an escape window is not accepted and clause 2.9.5 requires every apartment to have direct access to a protected enclosure with self-closing short fire resistance duration fire doors leading to an exit door. Above 7.5 metres clause 2.9.6 requires an alternative exit. Text verified identical in the April 2026 PDF handbook.
- very strong RN-ONL4C3
Scottish Government (mygov.scot)
SCOTLAND, last updated 24 November 2025. Scotland has no building notice or full plans choice and no private registered building control approvers: a building warrant must be obtained from the local council's building standards department BEFORE work starts, and starting work without one when required is an offence punishable by a fine. A warrant is needed for building a new home, extending a home, building or removing load-bearing walls, changing roofs, external walls or other structural elements, converting a loft or garage into a room, and demolition. Applications go through the eDevelopment portal, and the page lists all 32 Scottish councils plus their building standards departments as the verifiers. This directly contradicts an England-based note that offers a retrospective regularisation route or a choice of approved inspector.
- very strong RN-27DUQW
The National Archives (legislation.gov.uk)
The full Act in 22 sections. Section 1 covers a new building on the line of junction, section 2 the rights of an owner over an existing party wall, section 3 party structure notices, section 4 counter notices, section 5 disputes arising under sections 3 and 4, and section 6 adjacent excavation and construction (the 3 metre and 6 metre notice rules). Sections 7 to 9 deal with compensation, rights of entry and easements, section 10 with resolution of disputes and the surveyors award, sections 11 to 14 with expenses, security for expenses and accounts, and sections 15 to 21 with service of notices, offences, recovery of sums and interpretation. This contents page is the index a note should link to when naming a particular section.
- very strong RN-ERB4SL
The National Archives (legislation.gov.uk)
SCOTLAND. Part 1 was substituted wholesale on 6 February 2012 by SSI 2011/357 and is the Scottish householder permitted development code, materially different from England's Class A. Class 1A allows a single-storey ground floor extension but not forward of the principal elevation or a road-fronting side elevation, not more than 3 metres beyond the rear wall for a terrace or 4 metres otherwise where any part is within 1 metre of the curtilage boundary, eaves not over 3 metres, height not over 4 metres, resulting ground coverage not more than twice the original dwellinghouse, front or rear curtilage coverage not over 50 per cent, and NOT AT ALL within a conservation area. Class 1B allows a multi-storey ground floor extension only where no part is within 10 metres of the curtilage boundary and the height does not exceed the existing house. Scotland has no 6 metre or 8 metre larger home extension prior approval route.
- very strong RN-LBAKH4
The National Archives (legislation.gov.uk), Northern Ireland Statutory Rules
NORTHERN IRELAND, and Class A differs from England, Wales and Scotland alike. A single-storey rear extension may extend beyond the rear wall of the original dwellinghouse by no more than 4 metres for a DETACHED house or 3 metres for any other, must not exceed 4 metres in height, and must not come within 3.5 metres of a curtilage boundary with a ROAD opposite the rear wall. An extension of more than one storey is limited to 3 metres beyond the rear wall and must be at least 7 metres from the boundary opposite the rear wall, against Wales's 10.5 metres. Eaves must not exceed 3 metres within 2 metres of any boundary. A side extension must not exceed 4 metres in height or half the width of the original dwellinghouse. Class A expressly excludes ANY alteration to the roof, any deck, balcony, veranda or raised platform, any basement, any chimney, flue or soil and vent pipe, and any microwave antenna, so a Northern Ireland dormer or rooflight is not permitted development under this class. In a conservation area, World Heritage Site, AONB or National Park, cladding in stone, artificial stone, pebbledash, render, timber, plastic or tiles is excluded, as is any extension of more than one storey or over 4 metres or beyond a principal or side elevation. Condition A.3(b) requires any upper floor side-elevation window within 15 metres of a neighbouring curtilage boundary to be obscure glazed and non-opening below 1.7 metres above floor level. Northern Ireland has NO larger home extension prior approval route.
- very strong RN-T7W376
The National Archives (legislation.gov.uk), Scottish Statutory Instruments
SCOTLAND. The instrument that sets Scotland's building standards, made under the Building (Scotland) Act 2003, and the reason England's Approved Documents do not apply north of the border. Regulation 3 exempts certain buildings and services, regulation 5 introduces the descriptions of work not requiring a building warrant, regulation 8 covers fitness and durability of materials and workmanship, regulations 9 to 12 set the building standards for construction, demolition, services and conversion, and regulation 16 provides for relaxations. Schedule 1 lists exempted buildings, Schedule 3 the warrant-exempt work and Schedule 5 the mandatory building standards that the Technical Handbooks expand.
- very strong RN-GZLT9O
The National Archives (legislation.gov.uk), Scottish Statutory Instruments
SCOTLAND, and these figures contradict the England fees. Made 3 February 2026 and in force from 1 April 2026, amending SSI 2022/50. Category 2 of Table 1 sets the householder planning fee for the enlargement, improvement or other alteration of an existing dwelling at £371 for one dwelling and £742 for two or more, against England's £548 householder fee from the same date. Category 3 charges £371 for an outbuilding or other operation within the curtilage of an existing dwellinghouse ancillary to its enjoyment, and £371 for gates, fences, walls or other means of enclosure along a curtilage boundary. Regulation 3 raises the flat fee from £357 to £371, regulation 4 raises the discretionary fees from £238 to £247 and from £119 to £124, and paragraph 9(1) from £714 to £742. New dwellings are £742 each for the first 10, then £557, then £310 above 49, capped at £185,524.
- very strong RN-MZWVT0
Valuation Office Agency, HMRC (GOV.UK)
Published 22 January 2016 and last updated 15 June 2026, applying to England and Wales, this is the authority that corrects two common claims. First, on rebanding after an improvement: bands are based on the open market price on 1 April 1991 in England and 1 April 2003 in Wales, and if a property has increased in size since it was first assessed it may move to a higher band when it is next sold, so an extension does not trigger an immediate rebanding of the current owner. Second, on Council Tax during works: if the property is occupied the band will not be deleted even if significant repair or renovation works are underway, and only where the property is unoccupied and either beyond repair or undergoing major works making it uninhabitable can the owner apply to have the band removed. Reproduces the full band tables: England Band A up to 40,000 pounds through Band H over 320,000 pounds; Wales Band A up to 44,000 pounds through Band I over 424,000 pounds, Wales having nine bands to England's eight. Assessments are based on size, layout, character, location, change of use and the 1991 or 2003 value, and the Valuation Office does not use property price indexes.
- very strong RN-MY15X0
Welsh Government (gov.wales)
The Welsh Approved Document L Volume 1, in force until 3 March 2027, and the source for Welsh window figures, which are not identical to England's. Table 10.1 sets, for new and replacement windows and roof windows, a maximum U-value of 1.4 W/(m2K) or WER Band B, with an alternative for replacements of 1.2 W/(m2K) centre pane or low-E secondary glazing, and a threshold U-value for retained windows of 3.3. Rooflights: 2.2 for new and replacement, threshold 3.8. Doors more than 60 per cent glazed: 1.4 or DSER Band C, alternative 1.2 centre pane, threshold 3.3. All other doors: 1.4 or DSER Band B, threshold 3.3. External fire doorsets as defined in Approved Document B Volume 1 may be 1.8. Transitional easements allowed timber windows at 1.6 or WER Band C and timber doors at 1.8 or DSER Band E only where a building notice, initial notice or full plans were given before 23 November 2023. Paragraph 11.35 requires an existing window or door worse than the column (c) threshold to be replaced to column (a); paragraph 11.37 states that windows and doors mean the whole unit including the frame, so replacing just the glazing or the door leaf while retaining the existing frame is not building work and does not have to meet the energy efficiency requirements, though upgrading as close as practicable is sensible; paragraph 11.38 caps the total area of windows and doors at 25 per cent of total floor area where one is enlarged or created.
- very strong RN-JOH3I6
Welsh Government (gov.wales)
The Welsh Government landing page that shows which edition of Approved Document L applies in Wales and when. Two editions of Volume 1 (dwellings) sit side by side: the current edition in force until 3 March 2027 at /sites/default/files/publications/2024-05/building-regulations-approved-document-l-vol-1.pdf, and the 2026 edition in force from 4 March 2027 at /sites/default/files/publications/2026-04/building-regulations-approved-document-l-vol-1-2026.pdf. Note the date differs from England, where the 2026 edition of Approved Document L takes effect on 24 March 2027, so a note giving a single UK-wide changeover date is wrong for Wales by three weeks.
- very strong RN-2AZXB8
Welsh Government (gov.wales)
WALES. Building regulations approval is required to convert a loft or attic into a liveable space, and the guidance covers houses no more than two storeys high, with more extensive requirements for flats, maisonettes and houses over three storeys. The regulations are applied to ensure the structural strength of the new floor is sufficient, that the stability of the existing roof is not endangered, safe escape from fire, safely designed stairs to the new floor and reasonable sound insulation between the conversion and the rooms below. A liveable space includes a spare bedroom used infrequently. On boarding out for storage, existing ceiling joists tie the pitched roof members together and support the ceiling below and were not designed for significant load, so laying flooring boards over them may itself require a building regulations application, a point an England-based note on loft boarding usually treats as exempt. The Party Wall etc. Act 1996 applies in Wales as it does in England.
- very strong RN-Y1W23U
Welsh Government (gov.wales)
WALES, and the householder figure contradicts both England and Scotland. In force from 1 December 2025, rounded to the nearest pound. Category 6, the enlargement, improvement or other alteration of existing dwellinghouses, is £585 where the application relates to one dwellinghouse and £820 for two or more, against England's £548 from 1 April 2026 and Scotland's £371. Category 7(a), operations including the erection of a building within the curtilage of an existing dwellinghouse for ancillary purposes, or gates, fences, walls or other means of enclosure along a curtilage boundary, is £283 in each case. Category 1 charges £667 for each dwellinghouse for new dwellings, with a £16,675 base fee band above 25 dwellinghouses and a maximum of £203,380. A non-material amendment under section 96A of the Town and Country Planning Act 1990 costs £123 for a householder application and £242 otherwise. Site visits are charged at £493 or £166 per visit depending on category.