Planning Permission in Horsham
Non-Metropolitan District in South East · Last updated April 2026
Horsham district covers a large swathe of West Sussex, from the market town of Horsham in the north through the High Weald AONB to the South Downs National Park fringe. The district includes attractive villages like Steyning, Storrington, and Billingshurst, plus significant areas of ancient woodland and Wealden countryside.
With 4 conservation areas, 53 Article 4 directions, and 1,547 listed buildings, Horsham's heritage character is significant. The High Weald AONB covers much of the northern part of the district. The council approved 89.2% of applications in the year ending September 2025.
This guide covers permitted development rights, planning fees, and the application process for homeowners across the Horsham district — from the market town to the Wealden villages and surrounding countryside.
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What can I build in Horsham?
| Project type | Likely permitted development | May need planning permission | Likely needs planning permission |
|---|---|---|---|
| Rear extension (single storey) | Only outside conservation areas and Article 4 zones | Properties near boundaries | Conservation areas (4), Article 4 zones (53), listed buildings |
| Rear extension (two storey) | Only outside conservation areas and Article 4 zones, if within 3m limit | Check distance to boundary ≥7m | Conservation areas (4), Article 4 zones (53), listed buildings |
| Side extension | Detached houses outside protected zones | Semi-detached properties (half-width rule) | Conservation areas (4), Article 4 zones (53), listed buildings |
| Loft conversion (dormer) | Houses outside conservation areas | Properties on prominent corners | Conservation areas, listed buildings, flats |
| Loft conversion (Velux/rooflight) | Most of Horsham | Front-facing rooflights in conservation areas | Listed buildings |
| Outbuilding / garden office | Only outside conservation areas and Article 4 zones, if within size/height limits | Large outbuildings covering >50% of garden | Conservation areas (side or front), listed buildings |
| Porch | Most properties if within 3m² and 3m height | Properties near highway boundary | Conservation areas with restrictions, listed buildings |
| Solar panels | Most properties (roof-mounted) | Panels protruding beyond roofline | Listed buildings, conservation areas (if visible from road) |
| Driveway / hard standing | If using permeable surfacing | Non-permeable surfacing over 5m² | Conservation areas with specific restrictions |
| Garage conversion | Most of Horsham (internal works) | If changing external appearance significantly | Listed buildings |
This is general guidance based on Horsham's planning constraints. Your specific property may differ — use our free PD checker to get a result tailored to your address.
Permitted development in Horsham
Horsham's planning context is shaped by the High Weald AONB covering much of the district, and the South Downs National Park along the southern edge (handled by the Park Authority). The 53 Article 4 directions remove specific PD rights in sensitive areas. Only 4 conservation areas exist, but the AONB designation provides broader protection. Outside protected zones, standard PD rights apply. The 89.2% approval rate shows a constructive approach.
What Horsham expects from your project
Local design guidance
Design Principles SPD
Local Plan: Horsham District Planning Framework
The Horsham District Planning Framework was adopted in November 2015. It is the statutory development plan for the West Sussex district covering Horsham town, Crawley's rural fringe and villages such as Billingshurst and Henfield. The district borders the South Downs National Park.
Emerging / replacement plan
Horsham is preparing a new Local Plan. A Regulation 18 Issues consultation ran in 2021-2022, and a Regulation 19 Pre-Submission Plan consultation ran in 2023. Submission to the Planning Inspectorate was made in 2024.
53 Article 4 directions
Horsham has applied Article 4 directions to 53 areas, which remove certain permitted development rights in those zones. Use our free checker to see if your property is affected.
Conservation areas in Horsham
4 designated conservation areas
Despite having only 4 conservation areas, Horsham has strong heritage character through its 1,547 listed buildings — one of the highest counts in West Sussex. The 53 Article 4 directions provide additional control over changes to the most sensitive properties and areas. The Wealden timber-framed buildings, medieval churches, and historic farmhouses define the district's architectural heritage.
Article 4 directions in Horsham
53 Article 4 direction areas
Listed buildings in Horsham
There are 1,547 listed buildings in Horsham. If your property is listed, permitted development rights are significantly restricted. Most external and many internal alterations will require listed building consent, which is separate from planning permission. Always check with Horsham's conservation team before starting any work on a listed property.
Planning application statistics
Year ending September 2025 | Source: MHCLG planning application statistics
Horsham received 1,290 planning applications and decided 1,207 in the year ending September 2025. The approval rate of 89.2% is above the national average of 86.9%. Major applications are expected to be decided within 13 weeks, while householder and other non-major applications have an 8-week target. The “in time” figures include decisions made within agreed extensions of time.
Horsham processed planning decisions with an 89.2% approval rate in the year ending September 2025. The rate reflects the council's constructive approach to appropriate development, balanced against the AONB and heritage constraints.
If your project complies with permitted development rules, you don't need to worry about approval rates — a Lawful Development Certificate is a factual assessment, not a judgment call.
Recent planning applications in Horsham
Browse what's been approved near you
Seeing what similar projects have been approved near your property can help you understand what Horsham expects in terms of scale, materials, and design. It's also useful for gauging how quickly the council processes applications.
Search planning applications on Horsham's portal →Data from MHCLG planning application register. Search for householder applications (H01/H02) to see extensions and loft conversions in your area.
Housing delivery in Horsham
Housing Delivery Test 2023 measurement | Source: MHCLG
Horsham delivered 1,726 homes against a requirement of 2,770 over the three-year measurement period, giving a Housing Delivery Test score of 62%. This is well below the 75% threshold, which triggers the most significant consequence: the “presumption in favour of sustainable development” (also called the “tilted balance”). This means planning applications for housing should be approved unless the harm would significantly and demonstrably outweigh the benefits. For homeowners, this is a strong signal — Horsham is under considerable pressure to approve housing, making it one of the more favourable environments for residential planning applications in England.
Lawful Development Certificates in Horsham
A Lawful Development Certificate (LDC) is formal confirmation from Horsham that your project is lawful under permitted development rules. It is not legally required before you build, but it is the only official document that proves your project did not need planning permission. Most solicitors will ask for one when you come to sell, remortgage, or insure your property.
Horsham decided 645 householder applications in the year ending september 2025. Their 8-week performance of 97.5% is above the national average of 93%, which suggests LDC applications are likely to be processed on time. LDC applications follow the same 8-week statutory determination period as householder planning applications.
How to apply for an LDC in Horsham
You can apply for a Lawful Development Certificate through the Planning Portal or directly through Horsham's website. You will need to submit:
- A completed application form (available on the Planning Portal)
- A site location plan at 1:1250 or 1:2500 scale
- Existing and proposed floor plans and elevations
- A written description of the proposed works and how they comply with the GPDO 2015
- The application fee of £258
Horsham must issue a decision within 8 weeks. If the application is approved, the certificate is a permanent legal record that the development is lawful. If refused, you can appeal to the Planning Inspectorate or amend your project and reapply.
Need help preparing your LDC application?
Our Permitted Development Certificate Report gives you a full PD eligibility assessment, property constraints check, and application checklist tailored to your address and project — so you can apply with confidence.
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Approval rates, decision patterns, Article 4 directions, fees & timelines, and council-specific tips for Horsham.
Pre-application advice in Horsham
Horsham offers a pre-application advice service. The fee for householder pre-app advice is From £150 for householder proposals.
Pre-app advice is worth paying for if your project is borderline, your property is in a conservation area, or your home is a listed building.
Think your project might be permitted development?
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Check your PD rights now →Horsham offers pre-application advice. With 53 Article 4 directions, pre-app advice helps identify restrictions early.
Planning fees and timelines in Horsham
| Application type | Fee | Typical timeline |
|---|---|---|
| Householder planning application | £528 | 8 weeks |
| Full planning permission | £610 per dwelling | 8-13 weeks |
| Lawful Development Certificate (proposed) | £264 | 6-8 weeks |
| Lawful Development Certificate (existing) | £298 | 6-8 weeks |
| Listed building consent | Free | 8 weeks |
| Prior approval | £120 | 56 days |
| Discharge of conditions | £145 per request | 8 weeks |
| Non-material amendment | £44 | 28 days |
Fees are set nationally and correct as of April 2026. Pre-application fees are set by Horsham and may change. Building regulations fees are separate — see the building control section below.
Building regulations in Horsham
Building regulations approval is separate from planning permission. Most extensions, loft conversions, and structural alterations need building regs approval even if they don't need planning permission.
Building control in Horsham is provided by Horsham District Council. You can also use a private approved inspector instead of the council's service.
Building control contact
Horsham planning department
Your building project checklist for Horsham
- Check if your property is in a conservation area — Horsham has 4 conservation areas. Use our free checker or see the list above.
- Check for Article 4 directions at your address — Horsham has 53 Article 4 areas. Check your address.
- Check if your property is listed — search the Historic England list.
- Use our free PD checker to see if your project qualifies as permitted development — Check now.
- Consider a Lawful Development Certificate if PD applies — it protects you when selling. Learn more about LDCs or get your PD Certificate Report.
- Consider pre-application advice if planning permission is needed — see the pre-application section above.
- Check building regulations — most extensions and loft conversions need building regs approval even if they don't need planning permission.
- Check Party Wall Act obligations if building near a boundary — read our Party Wall guide or use our free Party Wall tool.
- Notify your home insurer about planned building work.
- Get at least 3 quotes from builders and check their credentials.
Nearby planning authorities
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