Lambeth rear extension drawings at £589
Nearly a third of Lambeth is conservation area. Whether your house is a Brixton terrace or a Streatham semi, we work out first whether the back of it is covered, then draw the extension to suit.
- £439 drawings + £150 survey (£589 total)
- Conservation status checked
- Submitted to Lambeth
What do I pay for rear extension drawings in Lambeth?
You pay us £589: £439 for drawings, forms and submission, plus £150 for the measured survey, with no VAT to add. The application fee goes to Lambeth Council. Redraws are free until approval.
In a Lambeth rear extension job
- A conservation area and Article 4 check of your address before any drawing starts
- Measured survey, plus existing and proposed plans, elevations and a section
- A tree survey flag where trees on your land or next door could be affected
- A heritage-aware design note where the house sits in a conservation area
- Submission to Lambeth and every reply to the planning officer
| Our drawings and submission paid to us | £439 |
|---|---|
| Measured survey paid to us | £150 |
| Council householder fee paid to the council | £548 |
| Total | £1,137 |
We charge £589 in total. The £548 is paid to the council when the application goes in, and the survey is charged once if you later order building regulations drawings for the same house.
How much of Lambeth is protected?
Lambeth has 62 conservation areas covering about 30% of the borough (Lambeth conservation areas). Article 4 directions on external alterations cover all or part of nine of them, running from Vauxhall, Stockwell Park and St Marks in the north to Streatham Lodge, Leigham Court Estate, Park Hall Road, Hyde Farm, Lansdowne Gardens and Albert Square (Lambeth Article 4).
In any conservation area a rear extension of more than one storey is not permitted development under Class A. For example, a two-storey rear addition on a Stockwell Park villa needs an application, while a single-storey 3 m extension on a Tulse Hill house outside the conservation areas may need none.
What Lambeth’s information list asks of an extension
Lambeth’s Local Information Requirements ask for a tree survey to BS 5837:2012 wherever a proposal is likely to affect trees on the site or on adjacent land, including neighbours’ private trees and street trees (Lambeth requirements). Any basement, new or an extension of one, needs a basement impact assessment covering flooding, groundwater and structural stability.
Lambeth is piloting its own online submission tool for householder applications (Lambeth householder applications). We submit by whichever route suits the case, and we keep the drawing references consistent so the validation check is quick.
Decisions and CIL in Lambeth
Householder applications carry an 8 weeks statutory period. Lambeth decided 333 of 354 householder applications inside it in the year to June 2026.
Lambeth charges CIL by zone; for 2025 the indexed residential rates were £471 per square metre in Zone B (Kennington, Oval and Clapham), £294 in Zone C (Brixton, Herne Hill and Tulse Hill) and £236 in Zone D (Streatham and West Norwood) (Lambeth CIL 2025). A house extension adding under 100 m² is exempt under regulation 42.
Lambeth extensions in figures
- 333 of 354
- Lambeth Council householder applications decided within 8 weeks in the year to June 2026, out of all it decided (prior approvals not counted). MHCLG live table PS2, planning application statistics by district, July 2025 to June 2026 (GOV.UK)
- 62
- Conservation areas in Lambeth. Conservation area profiles (Lambeth Council)
- 30%
- Approximate share of the borough covered by conservation areas. Conservation area profiles (Lambeth Council)
- 9
- Conservation areas with Article 4 directions on external building alterations, in whole or part. Article 4 directions (Lambeth Council)
- BS 5837:2012
- Standard a Lambeth tree survey must follow where trees on or next to the site may be affected. Local Information Requirements 2024 (Lambeth Council)
- £294 per m²
- Lambeth residential CIL in Zone C (Brixton, Herne Hill, Tulse Hill), indexed for 2025. Annual CIL rate summary 2025 (Lambeth Council)
- £236 per m²
- Lambeth residential CIL in Zone D (Streatham, West Norwood), indexed for 2025. Annual CIL rate summary 2025 (Lambeth Council)
- £72.73 per m²
- The Mayor of London’s CIL in Lambeth (band 2) for permissions granted in 2026, owed only when a scheme is liable for CIL in the first place. Mayoral CIL: annual rate summary for 2026, Table 1 (Greater London Authority)
- 100 m²
- New floor space under which a house extension pays no CIL. Community Infrastructure Levy Regulations 2010, regulation 42 (legislation.gov.uk)
Lambeth rear extension questions
How do I know if my Lambeth house is in a conservation area?
Lambeth publishes a map and lets you check the constraints on any property in its planning database. We do that check for you before quoting the route.
Does a neighbour’s tree matter for my extension?
It can. Lambeth asks for a tree survey where trees on adjacent land, including street trees, may be affected by the work.
Will Lambeth charge CIL on a rear extension?
Lambeth’s residential rates run from £236 to over £400 per square metre depending on the zone, but an extension under 100 square metres is exempt.
How long does a Lambeth decision take?
The statutory period is 8 weeks from validation, and Lambeth met it for most householder cases in the year to June 2026. We cannot promise a date.
Other services people book with this one
- Prior approval for a larger home extension£349 drawings + £150 survey (£499 total)
- Lawful Development Certificate drawings£389 drawings + £150 survey (£539 total)
- Building regulations drawings£479 drawings + £150 survey (£629 total)
- Side return extension drawings£479 drawings + £150 survey (£629 total)
- Party wall notice£39
Is your Lambeth house in a conservation area?
Send the address. We check the designation and directions, then reply with the route and a fixed fee.