Extensions
109 sources in the library on extensions, 10 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 3.
- good RN-7TLLXG cited
Timber Development UK
TDUK's own announcement of the merger. It confirms TDUK was formed from TRADA and the Timber Trade Federation and that it publishes technical manuals, handbooks and guidance on timber design.
- fair RN-GX895U cited
LABC Warranty
LABC Warranty's foundations manual. It sets minimum clay foundation depths of 0.75, 0.9 and 1.0 m by shrinkability, requires tree influence to be allowed for, and requires engineer design beyond 2.5 m.
- supplier figure RN-LUJ3DG cited
Crittall Windows Ltd
The steel window maker's note on its door systems: thermally broken T60 reaches U-values as low as 0.8 W/m²K and the thermally enhanced W20 TE around 1.4 W/m²K.
- supplier figure RN-SYXQLM cited
English Oak Buildings
A green oak frame maker's own pricing page. It gives a guide price of £450–£850 per m² of floor area for its frames, with barn frames at the low end and small or complex frames at the high end.
- supplier figure RN-QQKEQM cited
Future SIPs
A UK EPS SIP maker's product table giving insulation thickness, panel thickness and U-value for each panel: 100 mm/122 mm 0.31, 125 mm/147 mm 0.25, 150 mm/172 mm 0.21, 200 mm/222 mm 0.16.
Cited in SIPs Extension Cost: Are Structural Panels Worth It?.
- supplier figure RN-BYJX5T cited
Kingspan Insulation
Kingspan's specification manual for the TEK SIP system gives the panel build-up (112 or 142 mm urethane core between 15 mm OSB/3) and worst-case whole wall U-values of 0.20 for 142 mm and 0.17 for 172 mm panels. Maker's own manual served from its document CDN.
Cited in SIPs Extension Cost: Are Structural Panels Worth It?.
- supplier figure RN-VMYWEU cited
Kingspan Insulation
Kingspan's product page for its TEK structural insulated panel system states the air leakage it can achieve and that the system is BBA certified.
Cited in SIPs Extension Cost: Are Structural Panels Worth It?.
- supplier figure RN-EFWZO6 cited
Premier SIPs
A UK SIP maker's product listing pricing a 172 mm polyurethane-core SIP with OSB3 facings at £150.00 inc. VAT for a 2440 × 1220 mm panel, about £50 per m² supply only.
Cited in SIPs Extension Cost: Are Structural Panels Worth It?.
- supplier figure RN-GH1Z2F cited
Prince Surveyors
an RICS, CIOB and RPSA accredited surveying practice on what party wall work costs in London and the home counties: £90 to £250 an hour, with a straightforward single-notice matter often settling between £700 and £1,500 in total, and the final figure turning on how many adjoining owners are involved. It is the second of the two practices the cost book's party wall fee is built from, and the wider of the two ranges
Cited in How to Convert Cellar, Loft Conversion Cost by London Borough, Loft Conversion Mistakes to Avoid.
- supplier figure RN-JLADBQ cited
Survey of Party Wall
a London party wall surveying practice publishing its own fixed fee, £950 to £1,450 per adjoining owner for a standard extension, broken into the stages it covers: site appraisal, serving the statutory notices, tracking the 14 day response, the schedule of condition, negotiating access, drafting the award and delivery, with VAT added on top. It is also the source for the point the notes most often get wrong, that the fee is per ADJOINING OWNER rather than per job, and that a neighbour who dissents and appoints their own surveyor is paid separately again by the building owner under section 10(11)
Cited in Average Loft Conversion Cost: Real 2026 Breakdown by Type, Extension Cost Per m²: What You'll Really Pay, How Much Does It Cost to Renovate a House in 2026? (UK), How Long Does a Loft Conversion Take? Week-by-Week Timeline and 6 more.
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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.
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Dwr Cymru Welsh Water
WALES and parts of England, since Dwr Cymru Welsh Water's operating area crosses the border. You must notify Welsh Water if extending over or within THREE METRES of a public sewer or lateral drain, across a network of more than 30,000 km of sewers. An application is unlikely to be accepted where the sewer's internal diameter exceeds 225 mm or the pipe is deeper than 3 metres, and a greater standoff may then be required; commercial extensions and new detached structures need a sewer diversion instead. Nothing may be built over or near water mains or pressurised sewers. There are two routes, self-certification against set criteria and a full application with technical assessment. The published charges are £278.10 for consent by letter with no network alterations, £936.85 for consent by letter after alterations, and £1,053.00 for consent by legal agreement, covering administration, any site inspection, technical support, liaison with building control or the approved inspector, and issue of the consent. Work must not start until consent is given, and sewer traces are strongly recommended before excavating. Accessibility adaptations get extra support via the Build Over Sewers team on 0800 917 2652.
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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-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.
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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.
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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.
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Homes England
Establishes what the government's housing and regeneration agency actually does, which matters because renovation articles often name Homes England as a source of homeowner grants when its remit is different. Its stated functions are to use its powers, expertise, land, capital and influence to form partnerships bridging public and private sector delivery of new homes and regeneration; to champion sustainable, well-designed homes and places; and to support a more resilient, diverse and innovative housing sector by helping new market entrants and small and medium-sized enterprises grow, encouraging greater use of modern methods of construction, and promoting attention to building safety. It names its partners as local authorities, housebuilders, investors and developers, not individual homeowners, and it now also operates the National Housing Bank. Its strategic plan sets out its mission and strategic objectives.
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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-40IW04
Ministry of Housing, Communities and Local Government
Covers requirements RA1 and RA2 of Schedule 1 to the Building Regulations 2010, which apply to the erection of a dwelling or of a building containing one or more dwellings. RA1 requires gigabit-ready physical infrastructure running from a network termination point in each dwelling to a distribution point (or as close as reasonably practicable, or to an access point, where the developer has no right to install in the intervening land), plus a common access point where the building contains more than one dwelling. RA2 requires an actual connection to a gigabit-capable public electronic communications network, subject to a cost cap set at paragraph 2.21 of GBP 2,000 for each new dwelling erected, after deducting any financial contribution from the network operator. Paragraph 1.6 exempts wholly non-residential buildings, existing buildings undergoing major renovation works, new dwellings created through a material change of use, rooms for residential purposes in hostels, hotels, boarding houses, schools and hospitals, Ministry of Defence and national security buildings, Schedule 2 exempt buildings, and buildings in isolated areas where a USO-standard connection would exceed the cost cap. Section 3 and Appendix B set out the connectivity plan, the model form a developer submits with the Building Regulations application.
- 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-K607FJ
Ministry of Housing, Communities and Local Government
The 130-page PDF of the August 2026 National Planning Policy Framework, the document a planning officer works from. It is the citable text for policy GB7, which lists what is NOT inappropriate development in the Green Belt and therefore needs no very special circumstances: agriculture, horticulture and forestry or work solely for nature conservation; the reuse, extension, alteration or replacement of an existing permanent and lawful building where the change is not a disproportionate increase in size against the original building (and any replacement is for the same use and not materially larger); limited infilling in Green Belt villages; limited affordable housing for local needs; redevelopment of previously developed land that would not cause substantial harm to openness; and, where openness impact is minimised, mineral extraction, engineering operations, utilities and telecommunications infrastructure needing a Green Belt location, Community Right to Build or Neighbourhood Development Orders, material changes in the use of land, and facilities for outdoor sport, recreation, cemeteries, burial grounds and allotments. GB7(1)(g) adds the grey belt route and GB8 sets the Golden Rules for major housing development. Chapter 20 (HE1 to HE10) is the heritage chapter: HE1 covers plan-making and local heritage lists for non-designated assets, HE2 covers conservation areas and World Heritage Sites, HE3 covers Historic Environment Records, HE4 requires conservation appropriate to significance and clear and convincing justification for harm, and HE5 requires a proportionate significance assessment and a stated degree of harm, judged on effect on significance rather than the scale of the development.
- 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-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-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-3Q8OST
Scottish Government (gov.scot)
SCOTLAND. Defines the six concepts that decide whether Scottish householder permitted development applies: principal elevation identifies the front of the dwellinghouse and the rear elevation is the one opposite it, with side elevations linking the two; fronting a road determines whether an elevation is in the public domain; front and rear curtilage defines the land used for comfortable enjoyment of the house; site coverage controls the total ground covered; and height and ground level fix how height is measured. Critically, the original dwellinghouse means the house as built, or as it stood on 1 July 1948 if built before that date, while the existing dwellinghouse means the house immediately before the proposed development, and Scotland's doubling-of-footprint and 50 per cent curtilage tests are measured against the original, so previous extensions count against the allowance.
- 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-4KIEKS
Scottish Government (gov.scot)
SCOTLAND. Standard 3.2 requires protection from radon and sets the action level at 200 becquerels per cubic metre, the level above which radon in homes should be reduced. Clause 3.2.1 defines a radon probability area as one where tests show 1 per cent of existing dwellings are likely to exceed 200 Bq/m3, mapped in the Indicative Atlas of Radon in Scotland published July 2011 by the Health Protection Agency and the British Geological Survey on the UKradon website, with per-property radon risk reports available from the same source. Clause 3.2.2 requires protective work where a dwelling is to be located or extended on ground designated as a radon probability area or where radon is known to exist, so an extension in Scotland can trigger radon measures that an England-based note would attribute to Approved Document C.
- 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-BWO1CR
The National Archives (legislation.gov.uk)
The instrument that made the 2021 changes real, so a note can date them exactly. Regulation 1 sets citation and commencement on 15 June 2022, extending to England and Wales but applying to buildings and building work in England. Regulation 11 amends Schedule 1: it adds "to a reasonable standard" to entry L1(b)(i), inserts new requirement L2 on on-site generation of electricity (systems must be appropriately sized, have effective controls and be commissioned to produce the maximum electricity reasonable in the circumstances), and inserts a whole new PART O OVERHEATING with requirement O1, reproduced in full and carrying NO limits on application. Regulation 4 inserts regulation 4(4) and 4(5), a rule renovation guides almost never mention: where Part L imposes a requirement on the work, then on completion the whole building must comply with Part F or be no more unsatisfactory in relation to Part F than before the work began, so a Part L job such as new glazing or wall insulation drags a whole-house ventilation duty with it. Regulation 8 inserts regulations 40A and 40B, requiring the person carrying out the work to give the owner information about an on-site electricity generation system, and about the Part O overheating provision, no later than five days after completion. Regulation 17 is the transitional provision: the amendments do not apply where a building notice or initial notice was given, or full plans deposited, before 15 June 2022, provided the work started before 15 June 2023.
- 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-4UGLYK
The National Archives (legislation.gov.uk), Northern Ireland Statutory Rules
NORTHERN IRELAND, and this is the fourth different householder planning fee in the UK. Made 11 March 2025 by the Department for Infrastructure under sections 223 and 247 of the Planning Act (Northern Ireland) 2011, coming into operation 1 April 2025. Category 4 charges £347 for each dwelling for the extension, improvement or alteration of an existing dwellinghouse, and Northern Ireland folds into that SAME category the erection of a building or other operations within the curtilage for ancillary purposes and the erection of gates, fences, walls or other means of enclosure, which Scotland and Wales charge separately. So the four nations stand at England £548, Wales £585, Scotland £371 and Northern Ireland £347. An outline application for a single dwellinghouse is £515 and a full application £1,035. Reduced fees and refunds rise from £76 to £78, advertisement consent from £226 to £231, and EIA development from £12,664 to £12,924.