Extension planning approval in Merton
Based on decisions in the last 5 years, as of 15 Jan 2026.
Of 3,226 extension planning applications decided by Merton in the last 5 years, 86% 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 Merton
- Rear extension : 85% approved (2,059 decided)
- Roof / fenestration : 92% approved (874 decided)
- Demolition : 91% approved (803 decided)
- Loft conversion : 86% approved (935 decided)
- Side extension : 85% approved (522 decided)
- Tree work : 98% approved (278 decided)
- Outbuilding / garden room : 84% approved (362 decided)
- Two-storey extension : 77% approved (284 decided)
Method
Approval rate = approved ÷ (approved + refused) over the public planning decisions we hold for Merton, matched to a type of work from the application description. We lead with the last few years so the figure reflects how Merton 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.