Rear extension in Newham
Do you need planning permission for a rear extension in Newham?
Forest Gate, East Ham and Plaistow terraces often extend under permitted development outside the conservation areas. Inside conservation streets — and where separate householder directions apply — expect a full application. Flats have no permitted development rights. The borough-wide small-HMO conversion direction (since 31 July 2013, except the London Legacy Development Corporation area) does not itself remove ordinary rear-extension rights.
Forest Gate, East Ham and Plaistow terraces extend under PD outside the conservation areas; the Woodgrange Estate and town-centre areas need a full application.
Newham is dense and fast-changing: Stratford and the Olympic legacy in the north, long Victorian terraces across Forest Gate, Manor Park, East Ham and Plaistow, and Royal Docks regeneration to the south. Much of the stock is terraced or flatted — tenure is the first filter. Outside the relatively few conservation areas, terrace rear extensions remain everyday projects.
What actually applies in Newham
Conservation areas in Newham
Real · planning.data.gov.ukEvery designated conservation area in Newham from the official dataset — inside one, permitted development narrows and design scrutiny rises.
- Durham Road, Manor Park
- East Ham Town Centre
- Forest Gate Town Centre
- Romford Road
- Stratford, St John's
- Sugar House Lane
- University Area
- Woodgrange Estate, Forest Gate
Source: planning.data.gov.uk · Open Government Licence. Boundaries are checked at address level by the area report.
Article 4 directions in Newham
Real · planning.data.gov.ukNo Article 4 geometry for Newham appears in the national planning.data.gov.uk dataset, but the borough has operated a borough-wide HMO Article 4 direction since 31 July 2013 (removing the right to convert a house to a small HMO across the borough except the London Legacy Development Corporation area), plus directions in the Durham Road, Romford Road and Woodgrange Road conservation areas. Check the council's Article 4 pages for the position at a specific address.
Source: planning.data.gov.uk · Open Government Licence. Checked at address level by the area report.
Prices: HM Land Registry UK House Price Index, December 2025 · 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 Newham, 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 Newham?
| 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 Newham
Starting design on a flat before checking lease and planning is the classic false start. National geometry does not currently hold Newham's Article 4 directions — confirm HMO and conservation-area positions on the council's pages.
Postcode districts in Newham
E15 is Stratford — the Olympic legacy, the Stratford St John's conservation area and the industrial heritage of Three Mills and Sugar House Lane nearby.
E15 — Stratford →E7 is Forest Gate — the Woodgrange Estate conservation area, which carries an Article 4 direction, and the Forest Gate town-centre area.
E7 — Forest Gate →E6 is East Ham — the East Ham Town Centre conservation area and the long Victorian terraces around Central Park.
E6 — East Ham →E13 is Plaistow — dense Victorian terraces and the West Ham streets nearby.
E13 — Plaistow →E16 covers Canning Town and the Royal Docks — overwhelmingly flatted regeneration stock, where flats have no permitted development rights, so almost any external alteration needs planning permission.
E16 — Canning Town & Royal Docks →E12 is Manor Park and Little Ilford, spanning Newham and Redbridge.
E12 — Manor Park & Little Ilford →E20 is the Olympic Park and Stratford City regeneration zone — mainly new-build flats and managed estates rather than Victorian terraces.
E20 — Olympic Park & Stratford City →Rear extension in Newham, asked straight
Do I need planning permission for a rear extension in Newham?
How much does a rear extension cost in Newham?
Does the small-HMO conversion direction affect rear extensions?
Can I extend a flat in Newham?
Do I need a party wall agreement?
What applies at your address?
Borough-level rules only narrow it down. Enter a Newham postcode for the live constraint check — conservation area, Article 4 and sold-price comparables, cited to source.
Need it in writing for one address? A planning permission report for a Newham property — from £59, or surveyor-reviewed from £295.
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.