Extension planning approval in Lambeth
Based on decisions in the last 5 years, as of 19 Jun 2026.
Of 1,628 extension planning applications decided by Lambeth in the last 5 years, 79% were approved. This is the council's track record for this kind of work. It is a useful gauge before you apply, not a guarantee for any one application.
Other work in Lambeth
- Roof / fenestration : 82% approved (770 decided)
- Rear extension : 77% approved (708 decided)
- Loft conversion : 77% approved (516 decided)
- Tree work : 93% approved (454 decided)
- Windows & doors : 79% approved (579 decided)
- Side extension : 84% approved (383 decided)
- Demolition : 85% approved (353 decided)
- Basement : 73% approved (281 decided)
Method
Approval rate = approved ÷ (approved + refused) over the public planning decisions we hold for Lambeth, matched to a type of work from the application description. We lead with the last few years so the figure reflects how Lambeth decides today, with the longer record as context. A rate is only shown once there are enough decided applications for it to be reliable. We publish aggregate figures only, never an individual application or applicant name. Read the full method and limits.