Extension planning approval in Slough
Based on decisions in the last 5 years, as of 22 Jun 2026.
Of 251 extension planning applications decided by Slough in the last 5 years, 54% 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 Slough
- Rear extension : 57% approved (211 decided)
- Loft conversion : 33% approved (48 decided)
- Roof / fenestration : 34% approved (47 decided)
Method
Approval rate = approved ÷ (approved + refused) over the public planning decisions we hold for Slough, matched to a type of work from the application description. We lead with the last few years so the figure reflects how Slough 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.