Rear extension drawings in Redbridge from £625
Ilford, Wanstead, Woodford and Barkingside: the Housing Design SPD gives maximum depths, a 3 metre roof guide and a parapet capped at 150 millimetres.
£625 £475 drawings + £150 survey (£625 total), no VAT to add
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The short answer
Redbridge’s Housing Design SPD, adopted in September 2019, gives maximum single-storey depths as a rule of thumb: 3.5 metres for a terrace or semi and 4.5 metres for a detached house. Greater depths are acceptable only where consistent with adjoining properties, and “creep” beyond the neighbours generally is not supported. Flat roofs should be about 3 metres, parapets 150 millimetres at most. 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 the neighbours’ rear extensions
- A depth check against 3.5 and 4.5 metres, and against what the adjoining houses have already built
- A roof height at 3 metres flat or 3 metres to the eaves and 4 to the ridge when pitched
- A check of your address against Redbridge’s 16 conservation areas and the Aldersbrook direction
- Plans to the April 2024 validation list, 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.
Get my fixed feeHow a Redbridge rear extension runs
Neighbour check
We see how far the houses either side already extend, since Redbridge compares you with them.
Survey
We measure the back, the garden and the neighbours’ rear walls.
Design
You choose depth and roof, with the route and risk of each written down.
Draw and submit
We prepare the pack to the validation list and submit it, then answer the case officer.
Maximum depths, and the “creep” test
Paragraph 3.2.2 of the Housing Design SPD says single-storey rear extensions must not dominate the original property or project so far that they are overbearing. The maximum depths, a rule of thumb, are 3.5 metres for a terraced house including an end terrace, 3.5 metres for a semi-detached house and 4.5 metres for a detached house.
Paragraph 3.2.3 then adds that depths greater than these will only be acceptable where consistent with adjoining properties, so creep beyond the neighbours will generally not be supported. Small gardens are also tested for outlook from rear habitable rooms. For example, a neighbour with a 3.5 metre extension makes a 4 metre one on your side an argument, not an entitlement.
Roof heights, parapets and infills
Flat roof extensions should generally be 3 metres high, and any parapet wall kept to a maximum of 150 millimetres. Pitched roofs should not have eaves above 3 metres or a height above 4 metres, and must not encroach on the first floor. A flat roof as a balcony or terrace will normally be refused.
Where an older house has a rear projection, the preferred infill does not extend beyond the rear elevation of that projection; for a wrap-around the guide asks for low eaves and shallow pitches, with eaves at 2.4 metres above ground. Permitted development gives 3 or 4 metres, and 6 and 8 with prior approval, except in conservation areas. Redbridge has 16, including the Aldersbrook and Lake House Article 4 direction of 28 October 2020.
Validation and CIL
Redbridge’s April 2024 validation list asks for a roof plan on all but change-of-use applications, a fire statement where a roof is changed, and a design and access statement from 100 square metres of new floor space in a conservation area.
Redbridge CIL is a flat £70 a square metre with indexation, £125.56 for permissions granted in 2026, on 100 square metres or more of new floor space, so a typical extension is outside it. Mayoral CIL is in band 2.
Rear extensions in Redbridge in numbers
680 of 706
Householder decisions by Redbridge Council between July 2025 and June 2026 (prior approvals left out) that were made inside 8 weeks.
Source: MHCLG live table PS2, district planning application statistics, July 2025 to June 2026 (GOV.UK)
3.5 m / 4.5 m
Maximum depth rule of thumb for a single-storey rear extension: terraced or semi-detached 3.5 metres, detached 4.5 metres.
Source: Housing Design SPD, adopted September 2019, paragraphs 3.2.2 to 3.2.6 and 3.3.5 (Redbridge Council)
No creep
Greater depths are acceptable only where consistent with adjoining properties; creep beyond the neighbours generally would not be supported.
Source: Housing Design SPD, adopted September 2019, paragraphs 3.2.2 to 3.2.6 and 3.3.5 (Redbridge Council)
3 m
Height a flat-roof extension should generally be, with any parapet wall kept to a maximum of 150 millimetres.
Source: Housing Design SPD, adopted September 2019, paragraphs 3.2.2 to 3.2.6 and 3.3.5 (Redbridge Council)
2.4 m
Height of eaves above ground for a wrap-around extension at an older house’s rear projection.
Source: Housing Design SPD, adopted September 2019, paragraphs 3.2.2 to 3.2.6 and 3.3.5 (Redbridge Council)
Sep 2019
Date Redbridge adopted its Housing Design SPD.
Source: Housing Design SPD, adopted September 2019, paragraphs 3.2.2 to 3.2.6 and 3.3.5 (Redbridge Council)
16
Conservation areas in Redbridge, according to the council’s own page.
April 2024
Date of Redbridge’s current Local and National Planning Application Requirement List.
£125.56
Redbridge CIL per square metre for permissions granted in 2026: a flat £70 with indexation.
£72.73
Mayoral CIL per square metre for permissions granted in 2026 in Redbridge, which is in band 2 (£60 when set in 2019). It applies only where CIL is due at all.
Source: Mayoral CIL: Annual CIL Rate Summary 2026 (London.gov.uk)
Questions about rear extensions in Redbridge
How deep can I go in Redbridge?
As a rule of thumb 3.5 metres on a terrace or semi and 4.5 on a detached house, and no further than the neighbours have gone. Permitted development with prior approval can allow more.
What is “creep”?
An extension that goes beyond what the adjoining houses have built. The SPD says it will generally not be supported.
How high can the parapet be?
Any parapet wall on a flat-roofed extension should be kept to a maximum of 150 millimetres, with the flat roof about 3 metres high.
Do I pay CIL on a kitchen extension?
Not normally. CIL applies from 100 square metres of new floor space or a new dwelling.
See how far your Redbridge 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).