Planning Permission in Mid Sussex
Non-Metropolitan District in South East · Last updated April 2026
Mid Sussex sits in the heart of West Sussex, encompassing the towns of Haywards Heath, Burgess Hill, and East Grinstead. The district stretches from the High Weald AONB in the north through rolling countryside to the South Downs National Park in the south. The Green Belt protects land around Crawley and Gatwick to the north-west.
With 35 conservation areas, Green Belt, the High Weald AONB, and 993 listed buildings, Mid Sussex combines attractive countryside with growing towns. The council approved 91.1% of applications in the year ending September 2025.
This guide covers permitted development rights, planning fees, and the application process for homeowners across Mid Sussex — from urban properties to rural cottages and AONB countryside.
Planning a project in Mid Sussex? Start here.
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What can I build in Mid Sussex?
| 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 or Green Belt fringe areas | Conservation areas (35), listed buildings |
| Rear extension (two storey) | Only outside conservation areas and Article 4 zones, if within 3m limit | Check distance to boundary ≥7m or Green Belt fringe areas | Conservation areas (35), listed buildings |
| Side extension | Detached houses outside protected zones | Semi-detached properties (half-width rule) | Conservation areas (35), listed buildings |
| Loft conversion (dormer) | Houses outside conservation areas | Properties on prominent corners or Green Belt fringe areas | Conservation areas, listed buildings, flats |
| Loft conversion (Velux/rooflight) | Most of Mid Sussex | 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, Green Belt |
| 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 Mid Sussex (internal works) | If changing external appearance significantly | Listed buildings |
This is general guidance based on Mid Sussex's planning constraints. Your specific property may differ — use our free PD checker to get a result tailored to your address.
Permitted development in Mid Sussex
Mid Sussex's planning is shaped by the High Weald AONB (northern areas), the South Downs National Park (southern edge, handled by the Park Authority), and Green Belt to the north-west. The 35 conservation areas restrict development in the town centres and villages. AONB properties have reduced PD limits. Green Belt properties must ensure extensions are not disproportionate. In the main towns, standard PD rights generally apply outside conservation areas.
What Mid Sussex expects from your project
Local design guidance
Local Plan: Mid Sussex District Plan 2014-2031
Covers the period 2014 to 2031. Allocates strategic housing sites and sets policies for sustainable development across the district. A District Plan Review is underway given updated Standard Method housing figures.
35 conservation areas
Mid Sussex 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.
91.1% approval rate
Mid Sussex approves 91.1% 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 Mid Sussex
35 designated conservation areas
Mid Sussex's 35 conservation areas include East Grinstead's medieval High Street, Cuckfield's historic village centre, and the Weald villages of Lindfield and Ardingly. With 993 listed buildings — many timber-framed Wealden houses — the district has significant heritage character. The council carefully assesses proposals affecting conservation area character and listed building settings.
Article 4 directions in Mid Sussex
3 Article 4 direction areas
Listed buildings in Mid Sussex
There are 993 listed buildings in Mid Sussex. 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 Mid Sussex's conservation team before starting any work on a listed property.
Planning application statistics
Year ending September 2025 | Source: MHCLG planning application statistics
Mid Sussex received 1,219 planning applications and decided 1,031 in the year ending September 2025. The approval rate of 91.1% 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.
Mid Sussex processed planning decisions with a 91.1% approval rate in the year ending September 2025 — above the national average. The rate reflects the council's constructive approach despite significant heritage and environmental designations.
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 Mid Sussex
Browse what's been approved near you
Seeing what similar projects have been approved near your property can help you understand what Mid Sussex expects in terms of scale, materials, and design. It's also useful for gauging how quickly the council processes applications.
Search planning applications on Mid Sussex'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 Mid Sussex
Housing Delivery Test 2023 measurement | Source: MHCLG
Mid Sussex delivered 3,328 homes against a requirement of 2,339 over the three-year measurement period, giving a Housing Delivery Test score of 142%. This is above the 95% threshold, which means there are no government-imposed consequences for housing under-delivery. Planning applications in Mid Sussex are assessed on their own merits under standard planning policies.
Lawful Development Certificates in Mid Sussex
A Lawful Development Certificate (LDC) is formal confirmation from Mid Sussex 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.
Mid Sussex decided 687 householder applications in the year ending september 2025. Their 8-week performance of 98.3% 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 Mid Sussex
You can apply for a Lawful Development Certificate through the Planning Portal or directly through Mid Sussex'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
Mid Sussex 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 Mid Sussex needs planning permission.
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£49Mid Sussex Local Authority Report
Approval rates, decision patterns, Article 4 directions, fees & timelines, and council-specific tips for Mid Sussex.
Pre-application advice in Mid Sussex
Mid Sussex 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?
Check in 2 minutes with our free tool — no sign-up needed.
Check your PD rights now →Mid Sussex offers pre-application advice for all types of development.
Planning fees and timelines in Mid Sussex
| 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 Mid Sussex and may change. Building regulations fees are separate — see the building control section below.
Building regulations in Mid Sussex
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 Mid Sussex is provided by Mid Sussex District Council. You can also use a private approved inspector instead of the council's service.
Building control contact
Mid Sussex planning department
Your building project checklist for Mid Sussex
- Check if your property is in a conservation area — Mid Sussex has 35 conservation areas. Use our free checker or see the list above.
- Check for Article 4 directions at your address — Mid Sussex has 3 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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