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A single-storey house extension under construction at the back of a terraced house

Rear extension drawings in Barking and Dagenham from £625

Barking, Dagenham, Becontree and Chadwell Heath: the borough’s 2012 SPD sets a 3.65 metre depth, a 45 degree rule beyond it and a 50% garden cap.

£625 £475 drawings + £150 survey (£625 total), no VAT to add

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The short answer

Barking and Dagenham’s Residential Extensions and Alterations SPD, adopted in February 2012, says a terraced or semi-detached rear extension should not normally exceed 3.65 metres from the original rear wall. Only in exceptional cases may more be built, and then only the part beyond 3.65 metres within a 45 degree angle from the corner of the adjacent dwellings. An existing non-original extension counts towards the depth. Our fee is £475 drawings + £150 survey (£625 total), no VAT to add; the council’s fee is separate.

Rear extension drawings

from £625

Drawings
£475
Measured survey
£150
Total you pay
£625
VAT
None to add
  • A measured survey of the back of the house, the garden and any existing extension or outbuilding
  • A depth check against 3.65 metres and the 45 degree line from the neighbours’ corners
  • A 50% garden calculation that counts existing extensions and outbuildings
  • A check of your address against the borough’s four conservation areas
  • Plans to the 27 July 2026 checklist, and the route that fits submitted for you

£475 drawings + £150 survey (£625 total). A starting fee: we confirm one fixed figure after checking your address. The council’s own fee, where there is one, is paid to the council.

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How a Barking and Dagenham rear extension runs

  1. Original wall check

    We find the original rear wall and what has since been added, since later extensions use up the depth.

  2. Survey

    We measure the back, the garden, outbuildings and the neighbours’ corners.

  3. Design

    You choose depth and roof, with the 45 degree line and the route written down.

  4. Draw and submit

    We prepare the pack to the checklist and submit it, then answer the case officer.

Section 5.3 in plain terms

For a terraced or semi-detached house, the SPD says the depth should not normally exceed 3.65 metres measured from the original rear wall, to avoid material loss of daylight and outlook. In exceptional circumstances the part of the extension beyond 3.65 metres must sit within a 45 degree angle measured from the corner of adjacent dwellings. For detached houses, a judgement is made on the impact on neighbours and the distances to them.

An existing extension that is not original to the house counts towards the permitted depth, and on a house with an original tunnel-back extension further additions can have a significant impact, so officers take a view. For example, a Becontree house that already has a 2.5 metre scullery added in the 1970s may have little more than a metre left to build.

Heights, conservatories and garden

A flat roof should not exceed 3 metres. A pitched roof should have eaves no higher than 3 metres and a total height of 4 metres, and any parapet wall counts towards that height and should be kept to a minimum. If a conservatory is added in addition to an extension, a maximum depth of 6 metres from the original rear wall will be allowed, with obscure glazing or solid walls up to 2 metres where it flanks a boundary. Roof terraces and balconies on an extension will not be accepted if they overlook neighbours.

Any extension should not normally cover more than 50% of the garden, taken together with existing extensions and outbuildings. Permitted development gives 3 or 4 metres, or 6 and 8 with prior approval, outside conservation areas or Article 4 directions; the borough has four conservation areas, including Dagenham Village, and we check yours.

Prior approval for a larger home extension

Validation and CIL

The council’s householder validation checklist, last updated on 27 July 2026, asks for a roof plan wherever a roof is created or altered and for elevations, floor plans and sections at 1:50 or 1:100. The council is paperless and asks for submission through the Planning Portal.

Residential CIL for 2026 is £109.80 a square metre in Zone 1 (Barking Town Centre) and £15.69 in Zone 3, on 100 square metres or more of new floor space, so a typical extension is outside it. Mayoral CIL is in band 3.

Rear extensions in Barking and Dagenham in numbers

Questions about rear extensions in Barking and Dagenham

How deep can I go?

Normally 3.65 metres from the original rear wall on a terraced or semi-detached house. More is possible only in exceptional cases, within the 45 degree line.

Does an old extension count?

Yes. An existing extension that is not original to the house counts towards the permitted depth.

Can I add a conservatory too?

Yes, up to 6 metres from the original rear wall, with care over the side walls next to the boundary.

How much garden must I keep?

An extension should not normally cover more than 50% of the garden, counting existing extensions and outbuildings.

See how far your Barking and Dagenham house can go

Send the address and a photo of the back. We reply with the route and a fixed fee, from £475 drawings + £150 survey (£625 total).

Get my fixed feeCall 020 7131 9705