Side extension planning approval in Hounslow
Based on decisions in the last 5 years, as of 15 Jun 2026.
Of 112 side extension planning applications decided by Hounslow 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 Hounslow
- Extension : 81% approved (645 decided)
- Rear extension : 81% approved (392 decided)
- Demolition : 80% approved (240 decided)
- Listed building / conservation : 99% approved (204 decided)
- Tree work : 95% approved (185 decided)
- Roof / fenestration : 91% approved (44 decided)
- Outbuilding / garden room : 79% approved (112 decided)
- Two-storey extension : 74% approved (54 decided)
Method
Approval rate = approved ÷ (approved + refused) over the public planning decisions we hold for Hounslow, matched to a type of work from the application description. We lead with the last few years so the figure reflects how Hounslow 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.