This is not Lambeth's planning register. To look up or comment on a live application, use the council's own site: search Lambeth's register.
94% of the 34 side extensions Lambeth decided between March 2026 and October 2026 were approved; half were decided within 56 days. Plan Forecast, 5 November 2026.
Time to decide: half were decided within 56 days, counted from the day the application was valid (or received, where the register gives no valid date) over the 34 decisions with both dates.
Recent decisions
Real decisions, newest first. Addresses are reduced to the street here; the council publishes them in full on its own register.
Wolfington Road London
ApprovedErection of a single storey ground floor side extension with a courtyard.
Decided 5 October 2026 26/02623/FUL
Croxted Road London
ApprovedThe erection of a ground floor side extension, installation of 3 roof lights to the front and bifold doors to the rear.
Decided 24 September 2026 26/02194/FUL
Dalton Street London
RefusedErection of a side extension to provide a cycle store for both residential and commercial use; alterations to the access arrangement for the upper-floor flats, including the installation of a new external metal staircase and the creation of a new upper-level entrance doorway; installation of perforated metal panels to provide privacy screening. [Retrospective]
Decided 10 September 2026 26/01906/FUL
By ward in Lambeth
Approval rates differ across a council. These are every ward we hold enough decisions for.
- Waterloo & South Bank 89%
- Clapham Town 83%
- Herne Hill & Loughborough Junction 82%
- Brixton Acre Lane 78%
- Clapham East 82%
- Streatham St Leonard's 87%
- Knight's Hill 67%
- Streatham Common & Vale 73%
- Clapham Common & Abbeville 92%
- West Dulwich 73%
- Kennington 71%
- Brixton Windrush 78%
- Gipsy Hill 64%
- Oval 64%
- Stockwell East 65%
- Stockwell West & Larkhall 59%
- Streatham Hill East 86%
- Brixton Rush Common 76%
- Streatham Hill West & Thornton 94%
- Vauxhall 87%
Before you apply
- Do I need planning permission for a side extension?
- Do I need Building Regulations approval for a side extension?
Free check
Check your extension
Put a pin on your house, describe the work, and see it measured against each permitted development limit, with the clause it comes from. A guide, not a guarantee.
Other work in Lambeth
- Rear extension 178
- Loft conversion or dormer 177
- Garden room or outbuilding 47
- Two-storey extension 38
- Side extension 34
Questions people ask
What percentage of side extensions does Lambeth approve?
94% were approved, over 34 decisions that went one way or the other. Lambeth's figure across all types of work is drawn from 1,237 decisions.
How many side extensions has Lambeth decided?
34 that went one way or the other, from March 2026 to October 2026.
Get the forecast for your address
The figures above are the council. A forecast is your postcode: the same rate, the time a decision takes, and what happened on nearby streets. Free, and we email it to you.