Rear extension in Redbridge
Do you need planning permission for a rear extension in Redbridge?
Outside the conservation areas, much of Redbridge's suburban stock keeps permitted development rights for a single-storey rear extension within the limits, or larger via prior approval. Inside conservation streets — and any streets with further householder directions — expect a full application. The borough-wide small-HMO conversion direction (since 6 December 2019) does not itself remove ordinary rear-extension rights.
Ilford and Gants Hill semis extend under PD; the Wanstead, Snaresbrook and Woodford Green conservation areas need a full application.
Redbridge runs from Ilford and Goodmayes to the leafier, higher-value streets of Wanstead, Snaresbrook and Woodford on the forest fringe. Conservation areas and listed buildings concentrate design scrutiny in those heritage pockets; much of the ordinary suburban stock remains permitted-development territory for rear extensions.
What actually applies in Redbridge
Conservation areas in Redbridge
Real · planning.data.gov.ukEvery designated conservation area in Redbridge from the official dataset — inside one, permitted development narrows and design scrutiny rises.
- Aldersbrook
- Barnardo's Village Homes
- Claybury
- George Lane
- Little Heath
- Mayfield
- Snaresbrook
- South Woodford
- Valentines Mansion
- Wanstead Grove
- Wanstead Park
- Wanstead Village
- Woodford Bridge
- Woodford Broadway
- Woodford Green
- Woodford Wells
…plus 3 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 Redbridge
Real · planning.data.gov.ukNo Article 4 geometry for Redbridge appears in the national planning.data.gov.uk dataset, but the borough has operated a borough-wide HMO Article 4 direction since 6 December 2019 (removing the right to convert a house to a small HMO), plus further directions that remove permitted development in specific conservation-area streets. 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 Redbridge, 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 Redbridge?
| 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 Redbridge
National geometry does not currently hold Redbridge's Article 4 directions — confirm HMO and conservation-area positions on the council's pages. Daylight and party wall issues remain routine hold-ups.
Postcode districts in Redbridge
IG1 is Ilford — the borough's commercial heart, with Valentines Mansion and its park among the conservation set pieces.
IG1 — Ilford →IG8 is Woodford Green and Woodford Wells on the Epping Forest edge — the Woodford Green conservation area and leafy, higher-value streets.
IG8 — Woodford Green →E18 covers South Woodford and Snaresbrook — the Snaresbrook and George Lane conservation areas near the forest.
E18 — South Woodford & Snaresbrook →IG2 is Gants Hill and Newbury Park — interwar semi-detached suburbia on generous plots.
IG2 — Gants Hill & Newbury Park →IG6 covers Barkingside and Hainault — home to the Barnardo's Village Homes conservation area, the historic Dr Barnardo's girls' village.
IG6 — Barkingside & Hainault →IG3 is Goodmayes and Seven Kings in Redbridge — long suburban terraces and semis with strong extension precedent.
IG3 — Goodmayes & Seven Kings →IG4 covers the Redbridge and Gants Hill fringe — interwar stock on generous plots.
IG4 — Redbridge & Gants Hill fringe →IG5 is Clayhall and the Barkingside fringe in Redbridge.
IG5 — Clayhall & Barkingside fringe →RM6 is Chadwell Heath on the Redbridge–Barking and Dagenham boundary.
RM6 — Chadwell Heath →IG7 straddles the London boundary: Hainault, Fairlop and Grange Hill sit in Redbridge, while Chigwell and Lambourne lie in Essex under Epping Forest District — a different council with a different local plan, so the address decides which rules apply.
IG7 — Chigwell & Hainault →Rear extension in Redbridge, asked straight
Do I need planning permission for a rear extension in Redbridge?
How much does a rear extension cost in Redbridge?
Does the December 2019 small-HMO conversion direction affect rear extensions?
Is it harder to build in Wanstead than in Ilford?
Do I need a party wall agreement?
What applies at your address?
Borough-level rules only narrow it down. Enter a Redbridge 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 Redbridge 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.