Side extension planning approval rate in Horsham
93% of 721 decided side extension applications in Horsham were approved.
Checked against 20.6 million UK planning applications on file across 420 planning authorities. Approval rates from 2,343,419 decisions we classified across 181 councils in England.
A similar project nearby can help you understand the council's decisions. Its outcome does not establish what will be acceptable at your address.
93%
Approval rate, all years, from 721 decided
721
decided side extension applications in Horsham: 671 approved, 50 refused
93%
Recent rate, decided since 2022, from 222 decided
How to read these rates
These are historical outcomes for the applications in our archive, not the chance of approval for your property. Compare the same project type and read the decided count alongside each percentage.
About the planning data
Rate = approved divided by approved plus refused, using the decisions in our classified archive. Rates are withheld as unknown where fewer than 8 records of that project type were decided. Withdrawn applications are excluded.
Recent means records dated 2022 or later. Records without a year are excluded from the recent rate but remain in the all-years figure. Historical coverage varies by council, and duplicate application references may remain in the archive.
Approval rates from 2,343,419 decisions we classified across 181 councils in England. The wider 20.6 million application catalogue is accessible through PlanIT; it is not the dataset used to calculate these percentages.
Read the full methodology and coverage notes.
Project types and outcomes are classified from council records. Check the original application and decision notice before relying on an individual example. A page rebuild does not mean every council record has just been refreshed.
Example side extension decisions in Horsham
These examples deliberately include approved and refused applications where available. They are not a representative sample or a list of the latest decisions. Look up each reference on the council's planning search to read the plans and decision notice.
| Reference | Year | Decision | Application |
|---|---|---|---|
| DC/25/1829 | 2026 | Approved | Erection of a front porch and installation of a rear bay window. Erection of a two storey side extension with dormer window. Fairview Cottage Sands Lane Small Dole West Sussex BN5 9YL |
| DC/25/1855 | 2026 | Approved | Erection of a first floor extension over existing garage and single storey side extension. 11 Longhurst Drive Billingshurst West Sussex RH14 9XP |
| DC/25/1872 | 2026 | Approved | Erection of an extension to existing garage including new roof structure and rear workshop. Erection of a single storey side extension. Erection of access ga... Beeches Heather Way Storrington West Sussex RH20 4DD |
| DC/24/0968 | 2025 | Refused | Non Material Amendment to previously approved applications DC/14/1791 and DC/18/1179 (Proposed conservatories and two storey side extension and Variation of... 19 Holly Close West Chiltington West Sussex RH20 2JR |
| DC/24/1589 | 2025 | Refused | Erection of a two storey side extension and alterations to fenestration. 6 Wood End Horsham West Sussex RH12 4NU |
| DC/24/1631 | 2025 | Refused | Erection of a single storey side extension with internal alterations (Lawful Development Certificate - Proposed). 7 Pathfield Road Rudgwick West Sussex RH12 3HS |
About the planning data
Checked against 20.6 million UK planning applications on file across 420 planning authorities. Approval rates from 2,343,419 decisions we classified across 181 councils in England.
Other project types in Horsham
- Single-storey rear extension 95%, 1,102 decided
- Two-storey rear extension 91%, 444 decided
- Wraparound extension 97%, 231 decided
- Loft conversion and dormer 89%, 258 decided
- Rooflight 94%, 258 decided
- Outbuilding and garden room 89%, 292 decided
- Porch 98%, 181 decided
- Garage conversion 94%, 160 decided
- Basement 81%, 27 decided
- Window and door 93%, 338 decided