Planning Permission in Tonbridge and Malling
Non-Metropolitan District in South East · Last updated April 2026
Tonbridge and Malling sits in west Kent, stretching from the Medway valley to the edge of the Kent Downs AONB. The borough includes the historic castle town of Tonbridge, the commercial hub of Kings Hill, and numerous attractive villages including Borough Green, Hadlow, and Wateringbury. The River Medway winds through the borough, with its floodplain shaping development patterns.
With 60 conservation areas, Green Belt, and 1,318 listed buildings, the borough has a strong heritage character. The council approved 93.4% of applications in the year ending September 2025 — one of the higher rates in Kent — processing decisions efficiently across urban and rural areas.
This guide covers permitted development rights, planning fees, and the application process for homeowners across Tonbridge and Malling — from Victorian properties in Tonbridge town to rural cottages and Green Belt homes.
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What can I build in Tonbridge and Malling?
| 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 (60), 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 (60), listed buildings |
| Side extension | Detached houses outside protected zones | Semi-detached properties (half-width rule) | Conservation areas (60), 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 Tonbridge and Malling | 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 Tonbridge and Malling (internal works) | If changing external appearance significantly | Listed buildings |
This is general guidance based on Tonbridge and Malling's planning constraints. Your specific property may differ — use our free PD checker to get a result tailored to your address.
Permitted development in Tonbridge and Malling
Tonbridge and Malling's planning context is shaped by its Green Belt designation covering significant portions of the borough, and the Kent Downs AONB to the north. The 60 conservation areas restrict PD rights in Tonbridge town centre and numerous villages. Properties in the Green Belt must ensure extensions are not disproportionate to the original dwelling. AONB properties have reduced PD limits. Outside these protected zones, standard permitted development rights apply. The borough's high approval rate suggests a constructive approach to appropriate development.
What Tonbridge and Malling expects from your project
Local design guidance
Kent Design Guide (adopted as SPD)
Local Plan: Tonbridge and Malling Local Plan
Tonbridge and Malling adopted its Local Plan in July 2019. The plan directs growth principally to Tonbridge, West Malling and Kings Hill, with sensitive policies for the extensive Green Belt and Area of Outstanding Natural Beauty that cover much of the rural borough.
Emerging / replacement plan
Tonbridge and Malling is preparing a new Local Plan. A Regulation 18 consultation ran in 2023, with a Regulation 19 Pre-Submission plan anticipated in 2025–2026.
60 conservation areas
Tonbridge and Malling 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.
93.4% approval rate
Tonbridge and Malling approves 93.4% 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 Tonbridge and Malling
60 designated conservation areas
The 60 conservation areas span Tonbridge town centre — with its Norman castle and medieval High Street — and a wide network of Kentish villages. With 1,318 listed buildings including Tonbridge Castle, numerous medieval churches, and historic farmhouses, the council's heritage assessment is thorough. The conservation areas protect the distinctive character of settlements ranging from the Medway villages to the Kent Downs parishes. Homeowners in these areas face additional restrictions on visible alterations.
Article 4 directions in Tonbridge and Malling
1 Article 4 direction area
Listed buildings in Tonbridge and Malling
There are 1,318 listed buildings in Tonbridge and Malling. 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 Tonbridge and Malling's conservation team before starting any work on a listed property.
Planning application statistics
Year ending September 2025 | Source: MHCLG planning application statistics
Tonbridge and Malling received 970 planning applications and decided 870 in the year ending September 2025. The approval rate of 93.4% 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.
Tonbridge and Malling processed planning decisions with a 93.4% approval rate in the year ending September 2025 — one of the higher rates in Kent. This reflects the council's constructive approach and a well-informed applicant base. Processing efficiency is good across all categories, with effective delegation rates showing efficient handling of the caseload.
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 Tonbridge and Malling
Browse what's been approved near you
Seeing what similar projects have been approved near your property can help you understand what Tonbridge and Malling expects in terms of scale, materials, and design. It's also useful for gauging how quickly the council processes applications.
Search planning applications on Tonbridge and Malling'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 Tonbridge and Malling
Housing Delivery Test 2023 measurement | Source: MHCLG
Tonbridge and Malling delivered 1,351 homes against a requirement of 2,235 over the three-year measurement period, giving a Housing Delivery Test score of 60%. 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 — Tonbridge and Malling 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 Tonbridge and Malling
A Lawful Development Certificate (LDC) is formal confirmation from Tonbridge and Malling 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.
Tonbridge and Malling decided 555 householder applications in the year ending september 2025. Their 8-week performance of 85.2% is below the national average of 93%, so LDC applications may take longer than the 8-week target. LDC applications follow the same 8-week statutory determination period as householder planning applications.
How to apply for an LDC in Tonbridge and Malling
You can apply for a Lawful Development Certificate through the Planning Portal or directly through Tonbridge and Malling'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
Tonbridge and Malling 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 Tonbridge and Malling.
Pre-application advice in Tonbridge and Malling
Tonbridge and Malling 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 →Tonbridge and Malling offers pre-application advice for all types of development. A written response covers likely planning issues and relevant constraints.
Planning fees and timelines in Tonbridge and Malling
| 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 Tonbridge and Malling and may change. Building regulations fees are separate — see the building control section below.
Building regulations in Tonbridge and Malling
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 Tonbridge and Malling is provided by Tonbridge and Malling Borough Council. You can also use a private approved inspector instead of the council's service.
Tonbridge and Malling planning department
Your building project checklist for Tonbridge and Malling
- Check if your property is in a conservation area — Tonbridge and Malling has 60 conservation areas. Use our free checker or see the list above.
- Check for Article 4 directions at your address — Tonbridge and Malling has 1 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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