Two Victorian terraced houses on a London street, one painted white and one in yellow stock brick, with bay windows
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House extension plans · London Borough of Barking and Dagenham

House extension plans in Barking and Dagenham, £895 fixed

Barking and Dagenham's Residential Extensions and Alterations SPD (adopted 22 February 2012) says a single storey extension to a terraced or semi-detached house should not normally exceed 3.65 metres from the original rear wall. An earlier extension that is not original to the property contributes towards that depth. Detached houses are judged on impact.

Planning drawings£895
Building regs£795
Council fee£548
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Boroughs33/33
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Photo: Huy Phan / Pexels

The back of a house extension at shell stage, with a large glazed opening, blockwork walls and a scaffold tower
An extension at shell stage: the opening, the blockwork and the beam above it are what the building regulations drawings describe. Photo: Brett Jordan / Pexels.

What Barking and Dagenham Council asks of a house extension

From the council's Residential Extensions and Alterations SPD (adopted 22 February 2012, council page).

  • If the house is terraced or semi-detached, the depth of a single storey extension should not normally exceed 3.65 metres from the original rear wall; in exceptional circumstances, the part of an extension exceeding 3.65 metres must be within a 45 degree angle measured from the corner of adjacent dwellings. For detached houses a judgement is made on impact. (source, checked 15 October 2026)
  • An existing extension which is not original to the property contributes towards the permitted depth; where a house has an original tunnel-back extension, the impact of further extensions is judged on the prevailing circumstances. (source, checked 15 October 2026)
  • A flat-roofed extension should not exceed 3 metres in height; with a pitched roof the eaves should not exceed 3 metres and the total height 4 metres. Any parapet wall contributes towards the accepted height. (source, checked 15 October 2026)
  • Where a conservatory is proposed in addition to an extension, a maximum depth of 6 metres from the original rear wall will be allowed; a conservatory side wall flanking a neighbour should be obscure glazed, or solid to a maximum of 2 metres high. (source, checked 15 October 2026)
  • Any extension should not normally cover more than 50% of the garden space, taken together with any part of the garden covered by existing extensions or outbuildings. (source, checked 15 October 2026)
  • No part of a double storey extension should extend beyond a 45 degree angle taken from the corner of the adjoining property (or its solid-roofed extension). Two storey side extensions to semi-detached houses should be set back at least one metre at first floor level from the main front wall. (source, checked 15 October 2026)

What Barking and Dagenham house extension drawings have to show

Barking and Dagenham counts what is already there, so the drawings show the original rear wall, any earlier extension and then the proposal. For a terraced or semi-detached house a single storey extension should not normally exceed 3.65 metres from the original rear wall, and an existing extension that is not original to the property contributes towards that depth. In exceptional circumstances, the part beyond 3.65 metres must be within a 45 degree angle measured from the corner of adjacent dwellings. Where a house has an original tunnel-back extension, the impact of further extensions is judged on the prevailing circumstances.

A flat-roofed extension should not exceed 3 metres in height; with a pitched roof the eaves should not exceed 3 metres and the total height 4 metres, and any parapet wall contributes towards the accepted height. Any extension should not normally cover more than 50% of the garden space, taken together with any part of the garden covered by existing extensions or outbuildings. Where a conservatory is proposed in addition to an extension, a maximum depth of 6 metres from the original rear wall will be allowed. No part of a double storey extension should extend beyond a 45 degree angle taken from the corner of the adjoining property or its solid-roofed extension.

The council is a paperless office, and its householder checklist (checked 10 October 2026) asks for a site plan with written dimensions, including those to the boundaries, a design and access statement where any part of the house or garden is in a conservation area, and tree surveys by a qualified arboriculturist. Barking and Dagenham has four conservation areas. Article 4 directions removing permitted development rights for porches across the Becontree Estate, and for side and roof alterations on corner blocks, are due to come into force on 19 November 2026 if confirmed. The SPD is dated 2012; the council still lists it on its SPD page, as checked on 15 October 2026.

Barking and Dagenham guidance · rear depth

How deep Barking and Dagenham expects a single-storey rear extension to be

Terraced or semi-detached3.65 mDepth beyond the original rear wall · dashed line: permitted development
Source: Residential Extensions and Alterations SPD. The marker shows the national permitted development depth (GPDO 2015, Schedule 2, Part 1, Class A, A.1(f): 4 m detached, 3 m otherwise), which applies only where no application is needed.
Permitted development · Class A

How far a single-storey rear extension can go before it needs more than a drawing

Terraced or semi-detached

Existing houseNo applicationPrior approvalPlanning application3 m6 mDepth beyond the original rear wall

Detached

Existing houseNo applicationPrior approvalPlanning application4 m8 mDepth beyond the original rear wall

Height, side view

HouseBoundary2 m4 m maxoverall height3 m eaveswithin 2 m of boundary
Source: GPDO 2015, Schedule 2, Part 1, Class A: A.1(f) (3 m, or 4 m if detached; 4 m high), A.1(g) (6 m, or 8 m if detached; not on article 2(3) land such as conservation areas, nor on a site of special scientific interest), A.1(i) (eaves over 3 m within 2 m of a boundary) and the prior approval procedure in A.4. Terraced and semi-detached houses are the “any other dwellinghouse” case. Other conditions still apply: check the permission section and run the checker.
PS2 · at a glance

Barking and Dagenham: 388 householder decisions

Barking and Dagenham
Approvals, prior approvals included66.5%

258 of 388 granted. London: 85.8%.

Decided within 8 weeks100%

351 of 351 applications, prior approvals excluded.

Source: MHCLG PS2, 1 July 2025 to 30 June 2026. Dark tick: London.
A bright kitchen with white cabinets, a stainless steel range cooker and extractor hood, and a window over the sink
A kitchen in a rear extension: the wide opening into it from the old house is carried by a beam. Photo: Curtis Adams / Pexels.

What it costs in Barking and Dagenham

  • Planning drawings: £895, plus £548 to Barking and Dagenham Council.
  • Building regulations drawings: £795.

House extension plans across London · Barking and Dagenham planning rules · every price

Answers

Barking and Dagenham house extension questions

How deep can a single-storey rear extension be in Barking and Dagenham?
For a terraced or semi-detached house, the SPD says a single storey extension should not normally exceed 3.65 metres from the original rear wall. In exceptional circumstances, the part beyond 3.65 metres must be within a 45 degree angle measured from the corner of adjacent dwellings. For detached houses a judgement is made on impact.
Does an old extension count toward the 3.65m limit in Barking and Dagenham?
Yes, if it is not original to the property: the SPD says an existing extension which is not original contributes towards the permitted depth. Where a house has an original tunnel-back extension, the impact of further extensions is judged on the prevailing circumstances. Any extension should not normally cover more than 50% of the garden, together with existing extensions and outbuildings.
Can I add a conservatory to an extension in Barking and Dagenham?
Where a conservatory is proposed in addition to an extension, the SPD says a maximum depth of 6 metres from the original rear wall will be allowed. A conservatory side wall flanking a neighbour should be obscure glazed, or solid to a maximum of 2 metres high. Any extension should not normally cover more than 50% of the garden space.

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