Planning Permission in Spelthorne
Non-Metropolitan District in South East · Last updated April 2026
Spelthorne is Surrey's northernmost borough, sitting on the Thames between Heathrow Airport and the M25. The borough includes Staines-upon-Thames, Sunbury-on-Thames, Ashford, and Shepperton — all with strong Thames-side connections. Proximity to Heathrow and reservoirs shapes the environment, while Green Belt protects open spaces between the settlements.
With 8 conservation areas, 4 Article 4 directions, Green Belt, and 203 listed buildings, the borough balances suburban development with heritage and environmental protection. The council approved 82.4% of applications in the year ending September 2025.
This guide covers permitted development rights, planning fees, and the application process for homeowners across Spelthorne — from riverside properties to suburban homes near Heathrow.
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What can I build in Spelthorne?
| Project type | Likely permitted development | May need planning permission | Likely needs planning permission |
|---|---|---|---|
| Rear extension (single storey) | Most of Spelthorne outside protected zones | Properties near boundaries or Green Belt fringe areas | Conservation areas (8), Article 4 zones (4), listed buildings |
| Rear extension (two storey) | Most of Spelthorne outside protected zones, if within 3m limit | Check distance to boundary ≥7m or Green Belt fringe areas | Conservation areas (8), Article 4 zones (4), listed buildings |
| Side extension | Detached houses outside protected zones | Semi-detached properties (half-width rule) | Conservation areas (8), Article 4 zones (4), 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 Spelthorne | Front-facing rooflights in conservation areas | Listed buildings |
| Outbuilding / garden office | Most of Spelthorne outside protected 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 Spelthorne (internal works) | If changing external appearance significantly | Listed buildings |
This is general guidance based on Spelthorne's planning constraints. Your specific property may differ — use our free PD checker to get a result tailored to your address.
Permitted development in Spelthorne
Spelthorne's planning context is shaped by Green Belt, Thames flood risk, and proximity to Heathrow Airport. Green Belt properties must ensure extensions are not disproportionate. The 8 conservation areas and 4 Article 4 directions restrict development in the most historic areas. Flood risk is a significant consideration for many Thames-side properties. Aircraft noise contours from Heathrow can affect residential development proposals. In urban areas outside these constraints, standard PD rights apply.
What Spelthorne expects from your project
Local design guidance
Design of Residential Extensions and New Residential Development SPD
Local Plan: Spelthorne Core Strategy and Policies 2009–2026
Spelthorne Borough's development plan is based on its Core Strategy adopted in 2009. The borough is entirely within the Metropolitan Green Belt and is heavily influenced by its proximity to Heathrow Airport and the M25. Development is focused on the urban areas of Staines-upon-Thames, Ashford and Shepperton.
Emerging / replacement plan
Spelthorne is preparing a new Local Plan. A Regulation 19 Pre-Submission plan was consulted on in 2023, with submission to the Planning Inspectorate anticipated in 2024–2025 and adoption targeted for 2026.
Conservation areas in Spelthorne
8 designated conservation areas
Spelthorne's 8 conservation areas include Shepperton village (with its associations with the film industry and historic church), parts of Sunbury-on-Thames, and Laleham. With 203 listed buildings, the heritage is modest but well-protected. The 4 Article 4 directions provide additional control in the most sensitive locations, typically covering front-facing alterations and boundary treatments.
Article 4 directions in Spelthorne
4 Article 4 direction areas
Listed buildings in Spelthorne
There are 203 listed buildings in Spelthorne. 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 Spelthorne's conservation team before starting any work on a listed property.
Planning application statistics
Year ending September 2025 | Source: MHCLG planning application statistics
Spelthorne received 673 planning applications and decided 648 in the year ending September 2025. The approval rate of 82.4% is below 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.
Spelthorne processed planning decisions with an 82.4% approval rate in the year ending September 2025. The below-average rate reflects Green Belt constraints, flood risk, and the complexities of development near Heathrow Airport. Pre-application advice is recommended to navigate these 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 Spelthorne
Browse what's been approved near you
Seeing what similar projects have been approved near your property can help you understand what Spelthorne expects in terms of scale, materials, and design. It's also useful for gauging how quickly the council processes applications.
Search planning applications on Spelthorne'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 Spelthorne
Housing Delivery Test 2023 measurement | Source: MHCLG
Spelthorne delivered 992 homes against a requirement of 1,632 over the three-year measurement period, giving a Housing Delivery Test score of 61%. 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 — Spelthorne 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 Spelthorne
A Lawful Development Certificate (LDC) is formal confirmation from Spelthorne 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.
Spelthorne decided 415 householder applications in the year ending september 2025. Their 8-week performance of 98.1% 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 Spelthorne
You can apply for a Lawful Development Certificate through the Planning Portal or directly through Spelthorne'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
Spelthorne 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 Spelthorne.
Pre-application advice in Spelthorne
Spelthorne 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 →Spelthorne offers pre-application advice for householder and larger proposals. Recommended for Green Belt and flood zone properties.
Planning fees and timelines in Spelthorne
| 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 Spelthorne and may change. Building regulations fees are separate — see the building control section below.
Building regulations in Spelthorne
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 Spelthorne is provided by Spelthorne Borough Council. You can also use a private approved inspector instead of the council's service.
Building control contact
Spelthorne planning department
Your building project checklist for Spelthorne
- Check if your property is in a conservation area — Spelthorne has 8 conservation areas. Use our free checker or see the list above.
- Check for Article 4 directions at your address — Spelthorne has 4 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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