Rear extension in Haringey
Do you need planning permission for a rear extension in Haringey?
In most of Haringey, a single-storey rear extension within permitted development limits (3m on attached houses, 4m on detached, 4m height) can proceed without an application — the borough's Article 4 directions are localised to specific conservation areas rather than applied borough-wide, so much of the housing stock keeps full PD rights. Inside a conservation area, that basic single-storey rear allowance usually survives too; it's two-storey rear extensions and side elements that lose permitted development and need a full householder application. Always check the exact address: Haringey's protection is real, but it's drawn conservation area by conservation area, not applied across the whole borough.
PD carries many schemes in the east; Muswell Hill and Highgate need full applications.
Rear extensions are where Haringey's east-west contrast shows up most directly. In the borough's lighter-touch eastern streets, permitted development often carries the whole project, so the real work is a good drawn set and party wall notices rather than a planning argument. Move into the protected western conservation cores and the calculus changes: the single-storey rear allowance still generally applies, but you're now designing to sit comfortably on a Victorian or Edwardian streetscape that officers know well, and any hint of a second storey or side element pulls the scheme into a full application decided on precedent.
What actually applies in Haringey
Conservation areas in Haringey
Real · planning.data.gov.ukEvery designated conservation area in Haringey from the official dataset — inside one, permitted development narrows and design scrutiny rises.
- Bowes Park
- Bruce Castle
- Campsbourne Cottage Estate
- Crouch End
- Fortis Green
- Highgate
- Hillfield
- Hornsey High Street
- Hornsey Water Works & Filter Beds
- Lordship Lane
- Noel Park
- Peabody Cottages
- Rookfield
- St Anns
- Stroud Green
- THRHC/Bruce Grove
- THRHC/North Tottenham
- THRHC/Scotland Green
- THRHC/Seven Sisters/Page Green
- THRHC/Tottenham Green
- Tottenham Cemetery
- Tower Gardens
- Trinity Gardens
- Vallance Road
- Wood Green Common
…plus 5 further designated areas.
Source: planning.data.gov.uk · Open Government Licence. Boundaries are checked at address level by the area report.
Article 4 directions in Haringey
Real · planning.data.gov.ukArticle 4 directions in Haringey remove specific permitted development rights street by street — the single most common reason a "no permission needed" project turns out to need one.
- Ashley Rd
- Bounds Green Industrial Estate
- Brantwood Road
- Constable Crescent
- Cranford Way
- Cross Lane
- Crusader Industrial Estate
- Fountayne Rd
- Hale Wharf
- Herbert Rd/ Ashby Rd
- High Road East
- High Road West
- Marsh Lane
- Millmead & Lockwood
- North East Tottenham
- Omega Works
- Queen Street
- Rangemoor Rd
- South Tottenham
- Vale/ Eade Rd
- Vale/ Tewkesbury Rd
- White Hart Lane
- Willoughby Lane
- Wood Green
Source: planning.data.gov.uk · Open Government Licence. Boundaries are checked at address level by the area report.
Prices: HM Land Registry UK House Price Index, January 2026 · Open Government Licence.
The planning route — PD or permission?
Permitted development (GPDO Class A) covers single-storey rear extensions up to 3m beyond the original rear wall on attached houses and 4m on detached, with a maximum height of 4m. The 'larger home extension' route extends this to 6m/8m through prior approval with neighbour consultation — but that larger route is not available in conservation areas.
In conservation areas, the basic 3m/4m single-storey rear PD allowance usually survives — what conservation-area status removes is side extensions and two-storey rear extensions. An Article 4 direction can remove more, but Camden's directions in Hampstead and Belsize target front-and-side appearance (solar panels, window changes, boundary treatments), not the single-storey rear allowance. Flats have no PD rights at all. Two-storey rear extensions in conservation areas always need full permission.
Practical rule across London: check the address first. If a conservation area or Article 4 direction applies, budget for a full householder application decided on design, neighbour daylight (the 45-degree test) and materials.
Permitted development limits — rear extension
| Single-storey rear depth — attached house | 3m beyond the original rear wall |
| Single-storey rear depth — detached house | 4m beyond the original rear wall |
| Larger extension via prior approval | 6m attached / 8m detached — not in conservation areas |
| Maximum height (single storey) | 4m |
| Two-storey rear in a conservation area | Full planning permission required |
| Flats | No permitted development rights |
Limits summarise the General Permitted Development Order (Schedule 2, Part 1) as it applies in London. In Haringey, a conservation area, Article 4 direction or listed status changes the route — the panels above show what is designated, and the address check confirms what applies at your property.
How much does a rear extension cost in Haringey?
| Cost per m² (low — straightforward site) | £3,000 |
| Cost per m² (expected) | £3,800 |
| Cost per m² (high — conservation spec, hard access) | £4,600+ |
| Typical build cost (12–18m² single storey) | £36,000 – £83,000 |
| Professional fees, surveys, party wall (add) | 10–18% of build |
Indicative London ranges calibrated from real project data. Conservation-area specifications (matching stock brick, lime mortar, bespoke glazing) and restricted rear access are the two biggest cost drivers. VAT not included.
Realistic timeline
| Design and drawings | 4–8 weeks |
| Planning decision (full application) | 8–12 weeks (8-week statutory target) |
| Prior approval route, where available | 42 days |
| Party wall agreements | 4–10 weeks (parallel) |
| Build | 3–5 months |
What catches people out in Haringey
The most common trip-up is assuming permitted development applies borough-wide and only discovering an Article 4 direction once drawings are done — always verify at the exact address rather than by neighbourhood reputation. In the conservation cores, brick match and roofline get close scrutiny, and validation can run slower than the standard eight weeks at busy periods, so build in buffer.
Postcode districts in Haringey
N4 meets three boroughs — Haringey, Islington and Hackney — around Finsbury Park, so identical houses a street apart can answer to different planning departments.
N4 — Finsbury Park, Stroud Green & Manor House →N8's Edwardian and late-Victorian houses around Crouch End Broadway are textbook loft-conversion stock, and the precedent record is deep.
N8 — Crouch End & Hornsey →N10 is dominated by Muswell Hill's planned Edwardian estate — coherent red-brick avenues protected by conservation-area status and Article 4 directions over much of the core.
N10 — Muswell Hill →N15's long Victorian terraces and maisonette conversions make it one of Haringey's more flexible districts: conservation coverage is light, so permitted development carries many rear and loft projects.
N15 — South Tottenham & Seven Sisters →N22 centres on Wood Green's town-centre regeneration area, ringed by Edwardian terraces towards Bounds Green and Alexandra Palace.
N22 — Wood Green & Bounds Green →N6 splits between Haringey and Camden across Highgate village, where the conservation area, listed Georgian houses and the Highgate bowl's protected views combine into some of north London's toughest planning terrain.
N6 — Highgate →N17 is Tottenham and Bruce Grove — long Victorian terraces and mixed tenure, with Haringey as the primary planning authority and Enfield/Waltham Forest edges in places.
N17 — Tottenham & Bruce Grove →Rear extension in Haringey, asked straight
Can I add a rear extension without planning permission in Tottenham or Wood Green?
Does being in a conservation area rule out a rear extension in Haringey?
Why would a neighbour's identical rear extension have needed a full application when mine didn't?
How long does a rear extension take to get approved in Haringey?
Does it matter whether I'm in west or east Haringey for a rear extension?
What applies at your address?
Borough-level rules only narrow it down. Enter a Haringey postcode for the live constraint check — conservation area, Article 4 and sold-price comparables, cited to source.
Free, and it stays free — no account, no payment. The check reads official geometry at the property's own coordinates; listed status, lease terms and the state of the building all sit outside it.
Who to talk to about a rear extension in Haringey
A rear extension is a design-and-consent job first: someone has to draw it and take it through Haringey's planning route. The neighbour, condition and party wall side is separate work and a different profession — which is why there are two doors here, not one.
An extension is a design and consent job: the scheme, the planning application or prior approval, then the building-regs package.
- Residential design for extensions, lofts, basements and conversions
- Planning applications, pre-application advice and appeals
- Lawful development certificates
- Building-regulations and technical design drawings
- Conservation-area design and listed building consent applications
Excavating foundations within 3m of a neighbour is notifiable — the surveyor serves the party wall notices.
- Building surveys, RICS home surveys and defect diagnosis
- Party wall matters and awards
- Technical due diligence before a purchase
- Leasehold and major-works advisory (Section 20)
- Dilapidations and building pathology
Both practices are independent and separately regulated — Hampstead Chartered Surveyors & Building Consultancy is an RICS-regulated firm (Firm Reg. 923064); Hampstead Architecture and Planning are ARB-registered architects. We publish no fees for their work: each quotes directly for the job in front of them. Your enquiry goes to the practice you choose — we never pass your details to builders or other third parties.
Planning terms on this page
Conservation Area · Article 4 Direction · Permitted development · Full planning · Prior approval · Party wall · Designated land
Plain-English definitions · full planning glossary →
Planning Permission Checker provides planning and cost intelligence for early feasibility only. It is not legal, planning, valuation, architectural, structural, or surveying advice. All estimates are indicative and must be verified by qualified professionals before purchase, design, planning submission, or construction.
Cost estimates are indicative only — not a quotation. Final price depends on survey, specification, structure, access, party wall matters, VAT, professional fees, and contractor availability.
Planning outcomes are not guaranteed. Local planning authorities make final decisions.