Side return extension in Ealing
Do you need planning permission for a side return extension in Ealing?
A classic move on the terraces of Ealing, Hanwell and Acton; conservation areas need a full application under SPD 4. Side extensions have no permitted-development route inside a conservation area, and wrap-arounds usually need a full application even outside one.
A classic move on the terraces of Ealing, Hanwell and Acton; conservation areas need a full application to SPD 4 (Residential Extensions).
The continuous Victorian and Edwardian terrace belts are natural side-return territory, with enough completed schemes that matching a neighbour's depth and roof detail is often the quickest design argument. Outside the protected estates, a pure side infill within the size limits can still have a permitted-development path; most homeowners still prefer the certainty of drawings that would also support a full application if needed. Officers focus on boundary wall height, neighbour daylight and the host-roof junction.
What actually applies in Ealing
Conservation areas in Ealing
Real · planning.data.gov.ukEvery designated conservation area in Ealing from the official dataset — inside one, permitted development narrows and design scrutiny rises.
- Acton Green
- Acton Park
- Acton Town Centre
- Bedford Park
- Brentham Garden Estate
- Brunswick
- Canalside, northeast part
- Canalside, northwest part
- Canalside, southeast part
- Canalside, southwest part
- Churchfields
- Creffield
- Cuckoo Estate
- Ealing Common
- Ealing Cricket Ground
- Ealing Green
- Ealing Town Centre
- Grange and White Ledges
- Hanger Hill Garden Estate
- Hanger Hill, Haymills Estate
- Hanwell Cemeteries
- Hanwell Clock Tower
- Hanwell Village Green
- Haven Green
- Mill Hill Park
- Montpelier Park
- Mount Park
- Northolt Village Green
- Norwood Green
- Old Oak Lane
- St Mark's Church and Canal
- St Stephen's
Source: planning.data.gov.uk · Open Government Licence. Boundaries are checked at address level by the area report.
Article 4 directions in Ealing
Real · planning.data.gov.ukEaling's Article 4 directions aren't all in the national planning.data.gov.uk geometry, but the borough operates significant ones: directions made in October 2024 remove the permitted development right to convert a house (C3) into a small HMO (C4) — so an HMO conversion needs planning permission — and six conservation areas carry further Article 4 restrictions on householder permitted development. Check the council's Article 4 pages for the position at a specific address.
Source: planning.data.gov.uk · Open Government Licence · 1 directions recorded. 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?
Under permitted development, side extensions (GPDO Class A) must be single storey, no more than 4m high and no wider than half the original house — but side extensions are excluded from PD entirely in conservation areas. Wrap-around schemes combining side and rear elements usually exceed PD limits and need full permission everywhere.
In practice, most London side returns proceed by full householder application. The good news is the precedent base: on streets of identical terraces, a consented side return three doors down is the strongest evidence your scheme can cite. Officers focus on the boundary wall height, neighbour daylight and the junction with the host roof.
Permitted development limits — side return extension
| Storeys | Single storey only |
| Maximum height | 4m |
| Maximum width | No wider than half the original house |
| Conservation areas | Side extensions excluded from PD entirely |
| Wrap-around (side + rear combined) | Usually exceeds PD — full permission |
Limits summarise the General Permitted Development Order (Schedule 2, Part 1) as it applies in London. In Ealing, 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 side return extension cost in Ealing?
| Cost per m² (low) | £3,200 |
| Cost per m² (expected) | £4,000 |
| Cost per m² (high — wrap-around, conservation spec) | £4,800+ |
| Typical project (9–15m² incl. structural opening) | £45,000 – £110,000 |
| Professional fees, surveys, party wall (add) | 10–18% of build |
Side returns price higher per m² than plain rear extensions because steelwork, underpinning the party wall and roof glazing are spread over fewer metres. Indicative ranges from real project data; VAT excluded.
Realistic timeline
| Design and drawings | 4–8 weeks |
| Planning decision | 8–12 weeks (8-week statutory target) |
| Party wall award (boundary wall works) | 6–10 weeks (parallel) |
| Build | 3–4 months |
What catches people out in Ealing
Party wall procedure on the shared flank is unavoidable. Inside conservation areas — including the pioneering garden suburbs — even small external changes typically need permission; do not assume a side return is a paperwork-free weekend project.
Postcode districts in Ealing
W5 is the heart of the 'Queen of the Suburbs' — the Ealing Common, Ealing Green, Mount Park and Creffield conservation areas, the Hanger Hill Garden Estate and the pioneering Brentham Garden Estate at Pitshanger.
W5 — Ealing & Pitshanger →W13 runs from West Ealing to Northfields, taking in the St Stephen's and Montpelier Park conservation areas.
W13 — West Ealing & Northfields →W7 is Hanwell — the Hanwell Village Green, Hanwell Clock Tower and St Mark's Church and Canal conservation areas, with the Cuckoo Estate's planned cottages nearby.
W7 — Hanwell →W3 covers Acton — the Acton Park, Acton Green and Mill Hill Park conservation areas, with the Ealing side of Bedford Park, often called the world's first garden suburb.
W3 — Acton →UB2 reaches Southall and the Norwood Green conservation area, with its village green and the Grand Union Canal nearby.
UB2 — Southall & Norwood Green →UB1 is Southall in Ealing — dense terraces and mixed tenure with an Hillingdon edge.
UB1 — Southall →UB5 is Northolt on the Ealing–Harrow edge.
UB5 — Northolt →UB6 covers Greenford in Ealing (with a Harrow edge) — interwar and later suburban housing with industrial-edge pockets.
UB6 — Greenford →Side return extension in Ealing, asked straight
Is a side return permitted development in Ealing?
How much does a side return cost?
What do officers care about?
Will I need a party wall agreement?
Does a neighbour's side return help?
What applies at your address?
Borough-level rules only narrow it down. Enter a Ealing 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 Ealing 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.