Rear extension drawings in Havering from £625
Romford, Hornchurch, Upminster and Rainham: Havering lets you go beyond the standard depth if the extra stays inside a 45 degree line from the boundary.
£625 £475 drawings + £150 survey (£625 total), no VAT to add
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The short answer
Havering’s Residential Extensions and Alterations SPD, adopted in March 2011, says houses can generally be extended 3 metres from the original rear wall on a terrace and 4 metres on a semi or detached house. Any greater depth should sit within a 45 degree angle taken from the 3 or 4 metre point on the boundary. A flat roof should be no higher than 3 metres. 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 boundaries and the neighbours’ rear walls
- A 45 degree angle drawn from the 3 or 4 metre point on each boundary, to show how far the extra depth can go
- A roof designed to the 3 metre flat-roof guide or hipped away from the neighbour
- A check of your address against Havering’s 11 conservation areas and the Gidea Park direction
- Plans to householder checklist 001, 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 Havering rear extension runs
Depth and angle check
We set your depth against 3 or 4 metres and the 45 degree line on each boundary.
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 checklist 001 and submit it, then answer the case officer.
The 45 degree line from the boundary
Paragraph 5.3 of the SPD says that as a general rule houses can be extended from the rear wall of the original dwelling by up to 3 metres for a terrace and up to 4 metres for a semi-detached or detached dwelling, to keep the extension subordinate. Any greater depth should be within an angle of 45 degrees, taken from the 3 or 4 metre dimension on the property boundary, to keep a reasonable level of amenity for neighbours.
Paragraph 5.2 lists what the acceptable depth depends on: plot width, size and shape, the size of the dwelling, the garden, proximity to neighbours, variation in building line, orientation and level changes. For example, a 5 metre extension on a semi is possible if the extra metre is pulled in from the boundary on a 45 degree angle, so a wide plot can take more than a narrow one.
Roofs, two storeys and conservation areas
Paragraph 5.6 says a single-storey extension with a flat roof should generally be no higher than 3 metres in total, and pitched roofs should protect neighbours equivalently, for example by hipping away from the boundary. Overly steep pitches are likely to be refused. Two-storey rear extensions should be set in not less than 2 metres from the common boundary with an attached house and project no more than 3 metres, up to 4 in exceptional circumstances.
Under Class A permitted development gives 3 or 4 metres, or 6 and 8 with prior approval. Havering has 11 conservation areas, and the Gidea Park direction, confirmed on 24 June 2016, brings extra controls, so we check your road first.
What Havering asks for, and CIL
For validation, householder checklist 001 asks for floor and roof plans, elevations and sections at 1:50 or 1:100 for extensions, and an ecology survey where a proposal may affect protected species. A design and access statement is wanted for over 100 square metres of new space in a conservation area.
Havering CIL for 2026 is £151.52 a square metre in Zone A and £66.67 in Zone B, and a charge under £50 is deemed zero. It applies from 100 square metres of new floor space, so a typical extension is outside it. Mayoral CIL is in band 3.
Rear extensions in Havering in numbers
558 of 571
Householder decisions by the London Borough of Havering 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 m / 4 m
Depth from the original rear wall the SPD gives as a general rule: 3 metres terrace, 4 metres semi-detached or detached.
45°
Angle, taken from the 3 or 4 metre point on the boundary, within which any greater depth should sit.
3 m
Total height a single-storey flat-roofed extension should generally not exceed.
2 m / 3 m
Set-in from the common boundary and projection for a two-storey rear extension next to an attached house.
Mar 2011
Date Havering adopted its Residential Extensions and Alterations SPD.
Checklist 001
The householder checklist: floor and roof plans, elevations and sections at a minimum of 1:50 or 1:100 for extensions.
Source: Planning application checklist 001, householder applications (London Borough of Havering)
11
Conservation areas in Havering, each with an appraisal and management proposals.
24 Jun 2016
Date the Gidea Park Conservation Area Article 4 direction was confirmed.
Source: Article 4 Direction, Gidea Park (London Borough of Havering)
£151.52 and £66.67
Havering CIL per square metre in Zone A and Zone B for permissions granted in 2026.
Source: Havering Community Infrastructure Levy, annual rate summary 2026 (London Borough of Havering)
Questions about rear extensions in Havering
How deep can I go in Havering?
As a general rule 3 metres on a terrace and 4 on a semi or detached. More can be acceptable if it sits inside the 45 degree line from the boundary point.
How do I draw the 45 degree line?
From the point on the boundary at 3 or 4 metres from the original rear wall, at 45 degrees into your garden. Extra depth should stay inside it. We draw this on the plan.
How high can a flat roof be?
About 3 metres in total next to the neighbour, per the SPD.
Do I pay CIL on a kitchen extension?
Not normally. Havering’s CIL applies from 100 square metres of new floor space, and a charge below £50 is zero.
See how far your Havering 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).