Side return extension in Barking and Dagenham
Do you need planning permission for a side return extension in Barking and Dagenham?
Workable where terraces survive around Barking and Becontree; conservation areas need a full application. Side extensions have no permitted-development route inside a conservation area.
Workable where terraces survive around Barking and Becontree; the conservation areas need a full application.
Where continuous terrace stock exists, side returns follow the usual daylight, boundary and roof-junction tests under the Residential Extensions and Alterations SPD. On the dominant estate and semi stock, wrap-arounds with side access are often more natural than narrow alley infills.
What actually applies in Barking and Dagenham
Conservation areas in Barking and Dagenham
Real · planning.data.gov.ukEvery designated conservation area in Barking and Dagenham from the official dataset — inside one, permitted development narrows and design scrutiny rises.
- Abbey and Barking Town Centre Conservation Area
- Abbey Road and Riverside Conservation Area
- Chadwell Heath Anti-aircraft Gun Site Conservation Area
- Dagenham Village Conservation Area
Source: planning.data.gov.uk · Open Government Licence. Boundaries are checked at address level by the area report.
Article 4 directions in Barking and Dagenham
Real · planning.data.gov.ukBarking and Dagenham's Article 4 directions, partly recorded in the national dataset, include a borough-wide HMO direction (planning permission to convert a house to a small HMO), upward-extension directions in specific areas (recorded as the Dagenham Village and Lymington directions, removing the right to add a storey), and a direction controlling certain commercial-to-residential changes outside industrial land. The Residential Extensions and Alterations SPD sets householder design expectations. Check the council's Article 4 register for the direction that applies at a given address.
Source: planning.data.gov.uk · Open Government Licence · 3 directions recorded. Checked at address level by the area report.
Prices: HM Land Registry UK House Price Index, January 2026 · 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 Barking and Dagenham, 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 Barking and Dagenham?
| 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 Barking and Dagenham
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 Barking and Dagenham
IG11 is Barking — the Abbey and Barking Town Centre and Abbey Road and Riverside conservation areas around the abbey ruins.
IG11 — Barking →RM8 sits in the vast interwar Becontree Estate — one of the largest council-built estates in the world.
RM8 — Becontree & Dagenham →RM9 covers Becontree Heath and the Valence area of Dagenham, still dominated by the interwar estate.
RM9 — Becontree Heath & Dagenham →RM10 includes the Dagenham Village conservation area around the parish church — which carries an Article 4 direction removing the permitted development right to add a storey.
RM10 — Dagenham Village →Side return extension in Barking and Dagenham, asked straight
Is a side return permitted development in Barking and Dagenham?
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 Barking and Dagenham 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.
Who to talk to about a side return extension in Barking and Dagenham
A side return extension is a design-and-consent job first: someone has to draw it and take it through Barking and Dagenham'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 · Party wall · Designated land · Building regulations
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.