Rear extension in Hackney
Rear extension in London — permitted-development limits, costs and the London-wide route. This page is the Hackney position.
Do you need planning permission for a rear extension in Hackney?
Outside a conservation area, most Hackney houses keep their full permitted development rights: a single-storey rear extension up to 3m (attached) or 4m (detached) needs no application, and the larger 6m/8m 'larger home extension' route is available too via prior approval. Inside one of Hackney's conservation areas, that basic single-storey allowance usually survives, but two-storey rear extensions lose the permitted development route entirely and always need a full application there. Hackney's Article 4 directions aren't in the national planning.data.gov.uk dataset at all — a data gap, not confirmation none apply — so a lawful development certificate or a direct check with the council is the only way to be certain before you design.
London's most active rear-extension market; contemporary design with good brickwork is mainstream.
That contemporary confidence extends across the borough's terrace stock: exposed brick, generous glazing and flat-roofed additions are standard fare on Hackney's Victorian streets, and officers weigh design quality on its own terms rather than defaulting to a period-matching brief. The distinction that actually matters for feasibility isn't style, though — it's which side of a conservation-area boundary a postcode falls on, since that decides between prior approval for a larger scheme and a full application argued on materials and neighbour daylight. Even inside the conservation areas, well-detailed modern schemes have a genuine track record of approval, not just tolerance.
What actually applies in Hackney
Conservation areas in Hackney
Real · planning.data.gov.ukEvery designated conservation area in Hackney from the official dataset — inside one, permitted development narrows and design scrutiny rises.
- Albion Square
- Beck Road
- Broadway Market
- Brownswood
- Clapton Common
- Clapton Pond
- Clapton Square
- Clissold Park
- Dalston
- Dalston Lane (West)
- De Beauvoir
- Fremont and Warneford
- Graham Road and Mapledene
- Hackney Road
- Hackney Wick
- Hoxton Street
- Kingsland
- Lea Bridge
- Lordship Park
- Mare Street
- Newington Green (North)
- Northwold & Cazenove
- Pitfield Street
- Queensbridge Road
- Regent's Canal
- Regent's Canal - Central & South Hackney CAAC
- Regent's Canal - Kingsland CAAC
- Regent's Canal - Shoreditch CAAC
- Shacklewell Green
- South Shoreditch
- St Mark's
- Stoke Newington
- Stoke Newington Reservoirs, Filter Beds and New River
- Sun Street
- Town Hall Square
- Underwood Street
- Victoria Park
- Well Street Conservation Area
Source: planning.data.gov.uk · Open Government Licence. Boundaries are checked at address level by the area report.
Article 4 directions in Hackney
Real · planning.data.gov.ukArticle 4 directions in Hackney remove specific permitted development rights street by street — the single most common reason a "no permission needed" project turns out to need one.
- 112 Upper Clapton Road (launderette)
- 16 Stamford Hill (launderette)
- 195 Mount Pleasant Lane (launderette)
- 202 Well Street (launderette)
- 20B Pitfield Street (launderette)
- 234 Haggerston Road (launderette)
- 253 Amhurst Road (launderette)
- 29 Marsh Hill (launderette)
- 50 Matthias Road (launderette)
- 6 Felton Road N1 5NA (launderette)
- 6 Gilpin Road (launderette)
- 6-7 Downs Court Parade, Amhurst road (launderette)
- 88 Stoke Newington High Street (launderette)
- 94 Chatsworth Road (launderette)
- 94 Weymouth Terrace (launderette)
- Addition to Hackney Central Major Town Centre (part 1)
- Addition to Hackney Central Major Town Centre (part 2)
- Anton Street Priority Employment Area
- Beck Road Conservation Area
- Belfast Road Priority Employment Area
- Broadway Market Local Shopping Centre
- Brownswood Conservation Area
- Chatsworth Road Local Shopping Centre
- Chesham Arms Public House, 15 Mehetabel Road
- Dalston
- Dalston Major Town Centre
- De Beauvoir Conservation Area (article 4 direction area)
- De Beauvoir Priority Industrial Area
- Densmure Road Local Shopping Centre
- Dunsmure Road Local Shopping Centre
- East of Dalston Major Town Centre
- Exemption Area (part 1)
- Exemption Area (part 2)
- Finsbury Park District Centre
- Finsbury Park District Town Centre
- Green Lanes Local Shopping Centre
- Hackney Central
- Hackney Central Activity Zone
- Hackney Central Area Action Plan
- Hackney Central Area Action Plan, Hackney Central District Town Centre (part 1)
- Hackney Central Area Action Plan, Hackney Central District Town Centre (part 2)
- Hackney Central Area Action Plan, Hackney Central District Town Centre (part 3)
- Hackney Central Area Action Plan, Hackney Central District Town Centre (part 4)
- Hackney Central Major Town Centre
- Hackney Downs Local Shopping Centre
- Hackney Downs Priority Employment Area
- Hoxton Street Local Shopping Centre
- Kingsland Road Local Shopping Centre
- Kingsland Road/Waste Local Shopping Centre
- Lauriston Road Local Shopping Centre
- Locally Significant Industrial Site - Frederick Terrace
- Locally Significant Industrial Site - Helmsley Place
- Locally Significant Industrial Site - Millfields
- Lower Clapton Road Local Shopping Centre
- Manor House Area Action Plan
- Manor House Local Shopping Centre
- Oldhill Street Local Shopping Centre
- Priority Industrial Area - Anton Street
- Priority Industrial Area - Belfast Road
- Priority Industrial Area - De Beauvoir
…plus 34 further designated areas.
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, March 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 Hackney, 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 Hackney?
| 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 Hackney
The recurring refusal pattern in Hackney is depth against daylight: extensions pushed to the maximum on a tight terraced plot routinely fall foul of the 45-degree test to a neighbour's windows, and overdevelopment of small rear gardens is one of the borough's most cited reasons for refusal. Don't assume your permitted development rights are intact just because a neighbour built recently — with Hackney's Article 4 position unconfirmed in the national dataset, a silently removed right is the other common trap.
Postcode districts in Hackney
E8's Victorian terraces around London Fields and Graham Road are among the most actively extended in London.
E8 — Hackney Central, Dalston & London Fields →E9 mixes Homerton's terraces with Hackney Wick's converted industrial stock on the Lea.
E9 — Homerton & Hackney Wick →E5's stock runs from Clapton Square's Georgian survivors to long Victorian runs towards the Lea marshes.
E5 — Clapton & Lea Bridge →N16's Church Street core and the streets around Clissold Park sit in conservation areas with active local scrutiny, while Stamford Hill's larger semi-detached stock sees frequent loft and rear conversions, often for big households.
N16 — Stoke Newington & Stamford Hill →Rear extension in Hackney, asked straight
Can I build a two-storey rear extension in Hackney under permitted development?
Can I extend a flat in Hackney?
How do I check if Article 4 affects my Hackney permitted development rights?
How much does a rear extension cost in Hackney?
What applies at your address?
Borough-level rules only narrow it down. Enter a Hackney 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.
What else a rear extension in Hackney can need
Planning permission is one consent. A rear extension in Hackney can still need any of these, including when the planning route itself looks straightforward.
- Party wall surveyor in London — the works cut into a shared wall, sit on the boundary, or excavate near a neighbour.
- Listed building consent in London — the building is listed. Internal alterations can need consent as well as anything visible from the street.
- Licence to alter in London — the property is a leasehold flat. The freeholder's consent is separate from the council's.
Other projects in Hackney
London Fields and Clapton terraces infill constantly; contemporary glazed returns approve well.
Side return extension in Hackney →Deep PD precedent outside the conservation cores; protected rooflines are the refusal zone.
Loft conversion in Hackney →Fewer applications, same technical bar; ground conditions near the Lea need early investigation.
Basement extension in Hackney →The borough's garden-office boom is real — London Fields and Clapton gardens convert weekly.
Garden room in Hackney →Who to talk to about a rear extension in Hackney
A rear extension is a design-and-consent job first: someone has to draw it and take it through Hackney'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.