Side return extension in Havering
Do you need planning permission for a side return extension in Havering?
Workable on the Romford and Hornchurch terraces where they survive; conservation areas and Green Belt need a full application. Side extensions have no permitted-development route inside a conservation area.
Workable on the Romford and Hornchurch terraces; Gidea Park and the conservation areas need a full application.
True side-return stock is a smaller slice of Havering than continuous inner-London belts. On the dominant semis, wrap-arounds with side access are often more natural. Officers still focus on boundary wall height, neighbour daylight and materials where a full application is needed.
What actually applies in Havering
Conservation areas in Havering
Real · planning.data.gov.ukEvery designated conservation area in Havering from the official dataset — inside one, permitted development narrows and design scrutiny rises.
- Corbets Tey
- Cranham
- Gidea Park
- Havering-atte-Bower
- Langtons, Hornchurch
- North Ockendon
- RAF Hornchurch
- Rainham
- Romford
- St Andrew's Church, Hornchurch
- St Leonard's, Hornchurch
Source: planning.data.gov.uk · Open Government Licence. Boundaries are checked at address level by the area report.
Article 4 directions in Havering
Real · planning.data.gov.ukNo Article 4 geometry for Havering appears in the national planning.data.gov.uk dataset, but the borough controls HMO conversions through two Article 4 directions in force since 13 July 2016 that together cover the whole borough (one for Brooklands, Romford Town, Heaton and Gooshays; a second for the rest), removing the right to convert a house to a small HMO. Much of the borough is Green Belt. 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?
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 Havering, 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 Havering?
| 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 Havering
Party wall procedure on a shared flank is unavoidable. Designing a wrap-around as pure permitted development is a common false start.
Postcode districts in Havering
RM1 is Romford — the historic market-town core and conservation area at the borough's centre.
RM1 — Romford →RM2 is Gidea Park — a celebrated model garden suburb and 1911 exhibition estate, protected as a conservation area with close design control over its Arts and Crafts houses.
RM2 — Gidea Park →RM11 covers Hornchurch and the leafy Emerson Park — the Langtons and St Andrew's Church conservation areas among them.
RM11 — Hornchurch & Emerson Park →RM14 is Upminster and Cranham on the rural edge — the Cranham conservation area and North Ockendon, with Green Belt beyond.
RM14 — Upminster & Cranham →RM13 covers Rainham and South Hornchurch — the Rainham conservation area around Rainham Hall, near the Thames-side marshes.
RM13 — Rainham & South Hornchurch →RM3 covers Harold Hill and Harold Wood in Havering — mid-century and suburban stock on larger plots.
RM3 — Harold Hill & Harold Wood →RM5 is Collier Row and Chase Cross, spanning Havering with a Barking and Dagenham edge.
RM5 — Collier Row & Chase Cross →RM7 covers western Romford and Rush Green in Havering (with a Barking and Dagenham edge).
RM7 — Romford west & Rush Green →RM12 is Hornchurch and Elm Park — interwar Havering stock with deep rear gardens.
RM12 — Hornchurch & Elm Park →Side return extension in Havering, asked straight
Is a side return permitted development in Havering?
How much does a side return cost?
What do officers focus on?
Will I need a party wall agreement?
Does a neighbour's consent help?
What applies at your address?
Borough-level rules only narrow it down. Enter a Havering 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 Havering 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.