Planning Permission in South Downs National Park
National Park Authority in England · Last updated April 2026
The South Downs National Park stretches 87 miles from Winchester to Eastbourne, covering 628 square miles of chalk downland, river valleys, and heathland across Hampshire, West Sussex, and East Sussex. With 171 conservation areas and 5,214 listed buildings, it is one of England's most heritage-rich national parks.
The NPA processes around 1,850 applications annually with a 90.1% approval rate. As the newest national park (designated 2010) and the most populated, the South Downs balances the conservation of its iconic landscape with the needs of established communities, market towns, and villages.
Homeowners should consult the South Downs Local Plan before starting work. The 171 conservation areas cover most villages and towns within the park.
Planning a project in South Downs National Park? Start here.
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What can I build in South Downs National Park?
| 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 (171), 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 (171), listed buildings |
| Side extension | Detached houses outside protected zones | Semi-detached properties (half-width rule) | Conservation areas (171), listed buildings |
| Loft conversion (dormer) | Houses outside conservation areas | Properties on prominent corners | Conservation areas, listed buildings, flats |
| Loft conversion (Velux/rooflight) | Most of South Downs National Park | 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 South Downs National Park (internal works) | If changing external appearance significantly | Listed buildings |
This is general guidance based on South Downs National Park's planning constraints. Your specific property may differ — use our free PD checker to get a result tailored to your address.
Permitted development in South Downs National Park
The South Downs has more restrictive PD rights as a national park, and the 171 conservation areas — one of the highest counts of any planning authority — mean most properties are subject to both national park and conservation area restrictions. With no Article 4 directions, the standard national park PD limits apply outside conservation areas. The 5,214 listed buildings mean many homeowners need listed building consent. The diversity of the park — from chalk villages to market towns — creates varied design contexts.
What South Downs National Park expects from your project
Local Plan: South Downs Local Plan
The South Downs National Park Authority is the local planning authority for the National Park, which covers parts of East Sussex, West Sussex and Hampshire. The South Downs Local Plan was adopted in July 2019 and replaced saved policies from multiple legacy local authority plans.
Emerging / replacement plan
The South Downs National Park Authority is reviewing the Local Plan to respond to the new NPPF. A Regulation 18 Issues and Options consultation ran in 2023-2024.
171 conservation areas
South Downs National Park has a high number of conservation areas. Check whether your property falls within one before starting any work — conservation area status significantly restricts what you can do without planning permission.
17 Article 4 directions
South Downs National Park has applied Article 4 directions to 17 areas, which remove certain permitted development rights in those zones. Use our free checker to see if your property is affected.
90.1% approval rate
South Downs National Park approves 90.1% of planning applications, above the national average of 86.9%. Well-designed residential applications in this area tend to have a good chance of success.
Conservation areas in South Downs National Park
171 designated conservation areas
The 171 conservation areas protect virtually every settlement in the South Downs — from the cathedral city of Winchester (partly in the park) to the market towns of Petersfield, Midhurst, and Lewes, and dozens of chalk downland villages. The park's building traditions include flint, brick, tile-hanging, and chalk clunch. The relationship between settlements and the surrounding landscape is a key planning consideration.
Article 4 directions in South Downs National Park
17 Article 4 direction areas
Listed buildings in South Downs National Park
There are 5,214 listed buildings in South Downs National Park. 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 South Downs National Park's conservation team before starting any work on a listed property.
Planning application statistics
Year ending September 2025 | Source: MHCLG planning application statistics
South Downs National Park received 1,847 planning applications and decided 1,692 in the year ending September 2025. The approval rate of 90.1% 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.
South Downs National Park Authority received 1,847 planning applications in the year ending September 2025, with a 90.1% approval rate across 1,692 decisions. The NPA processed 836 householder applications — the highest of any national park, reflecting the South Downs' large residential population. The approval rate demonstrates the NPA's constructive approach despite extensive 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 South Downs National Park
Browse what's been approved near you
Seeing what similar projects have been approved near your property can help you understand what South Downs National Park expects in terms of scale, materials, and design. It's also useful for gauging how quickly the council processes applications.
Search planning applications on South Downs National Park's portal →Data from MHCLG planning application register. Search for householder applications (H01/H02) to see extensions and loft conversions in your area.
Lawful Development Certificates in South Downs National Park
A Lawful Development Certificate (LDC) is formal confirmation from South Downs National Park 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.
South Downs National Park decided 836 householder applications in the year ending september 2025. Their 8-week performance of 94.5% 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 South Downs National Park
You can apply for a Lawful Development Certificate through the Planning Portal or directly through South Downs National Park'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
South Downs National Park 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.
Check your permitted development rights
Find out instantly whether your project in South Downs National Park needs planning permission.
FROM £39Permitted Development Certificate Report
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£49South Downs National Park Local Authority Report
Approval rates, decision patterns, Article 4 directions, fees & timelines, and council-specific tips for South Downs National Park.
Pre-application advice in South Downs National Park
South Downs National Park offers a pre-application advice service.
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?
Check in 2 minutes with our free tool — no sign-up needed.
Check your PD rights now →South Downs National Park Authority offers pre-application advice. Householder enquiries from around £150. Contact the planning team for guidance.
Planning fees and timelines in South Downs National Park
| 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 South Downs National Park and may change. Building regulations fees are separate — see the building control section below.
Building regulations in South Downs National Park
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 South Downs National Park is provided by South Downs National Park Building Control. You can also use a private approved inspector instead of the council's service.
Building control contact
Building control is provided by the relevant local authority or approved private inspectors.
South Downs National Park planning department
Your building project checklist for South Downs National Park
- Check if your property is in a conservation area — South Downs National Park has 171 conservation areas. Use our free checker or see the list above.
- Check for Article 4 directions at your address — South Downs National Park has 17 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.
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