Side extension planning approval in Horsham
Based on decisions in the last 5 years, as of 27 Apr 2026.
We hold no refused side extension decisions for Horsham in this period, so treat a full approval rate with caution. The council's own portal has the complete record.
Of 78 side extension planning applications decided by Horsham in the last 5 years, 100% 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 Horsham
- Extension : 96% approved (356 decided)
- Rear extension : 96% approved (237 decided)
- Listed building / conservation : 99% approved (171 decided)
- Demolition : 94% approved (127 decided)
- Tree work : 100% approved, no recorded refusals (121 decided)
- Roof / fenestration : 98% approved (87 decided)
- Loft conversion : 93% approved (68 decided)
- Change of use : 80% approved (66 decided)
Method
Approval rate = approved ÷ (approved + refused) over the public planning decisions we hold for Horsham, matched to a type of work from the application description. We lead with the last few years so the figure reflects how Horsham 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.
Ready to plan your side extension?
3 architects with public evidence are listed for Horsham. Their profiles show reviews, credentials and, where we hold it, real planning history in this council.