Planning Permission in Milton Keynes
Unitary Authority in South East · Last updated April 2026
Milton Keynes is one of England's most distinctive planned cities, designated as a new town in 1967 and now a thriving city with over 250,000 residents. Despite its modern reputation, the area contains 40 conservation areas and over 1,100 listed buildings, reflecting the historic villages that predated the new town — including Stony Stratford, Newport Pagnell, Olney, and Wolverton.
The city's unique grid-road system, extensive parkland, and distinctive modernist architecture create a planning context unlike any other English authority. With 16 Article 4 directions protecting specific areas from certain permitted development changes, Milton Keynes balances preserving its new town heritage with enabling continued growth.
Milton Keynes approved 87.4% of planning applications in the year ending September 2025, with 1,131 decisions from 1,190 applications. Housing delivery at an exceptional 147% far exceeds targets, with no additional buffer required.
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What can I build in Milton Keynes?
| 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 (40), Article 4 zones (16), 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 (40), Article 4 zones (16), listed buildings |
| Side extension | Detached houses outside protected zones | Semi-detached properties (half-width rule) | Conservation areas (40), Article 4 zones (16), listed buildings |
| Loft conversion (dormer) | Houses outside conservation areas | Properties on prominent corners | Conservation areas, listed buildings, flats |
| Loft conversion (Velux/rooflight) | Most of Milton Keynes | 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 Milton Keynes (internal works) | If changing external appearance significantly | Listed buildings |
This is general guidance based on Milton Keynes's planning constraints. Your specific property may differ — use our free PD checker to get a result tailored to your address.
Permitted development in Milton Keynes
Milton Keynes' permitted development framework reflects its unique dual character. The grid-road estates have standard PD rights, but 16 Article 4 directions protect specific areas from changes of use and certain alterations. The 40 conservation areas, covering historic villages absorbed into the new town, add heritage restrictions. The council pays particular attention to the distinctive landscape framework of Milton Keynes — the linear parks, grid-road corridors, and estate landscape — which is integral to the city's character.
What Milton Keynes expects from your project
Local Plan: Milton Keynes Local Plan
Milton Keynes' current statutory framework comprises Plan:MK, adopted in March 2019, covering the period 2016-2031. The unitary council is one of England's most rapidly growing areas, built around the 1970s planned city of Milton Keynes.
Emerging / replacement plan
Milton Keynes is preparing a new Local Plan (MK Futures 2050) for the period to 2040 and beyond. A Regulation 18 Issues and Options consultation ran in 2022-2023, with the Regulation 19 Pre-Submission Plan consultation expected in 2025.
40 conservation areas
Milton Keynes 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.
16 Article 4 directions
Milton Keynes has applied Article 4 directions to 16 areas, which remove certain permitted development rights in those zones. Use our free checker to see if your property is affected.
Conservation areas in Milton Keynes
40 designated conservation areas
Milton Keynes' 40 conservation areas primarily cover the historic villages and market towns that predate the new town. Stony Stratford, Newport Pagnell, and Olney have outstanding Georgian and Victorian streetscapes. Wolverton's Victorian railway town grid is uniquely preserved. Several conservation areas also protect early new town housing estates recognised for their architectural significance. The council expects proposals to respect the specific character of each conservation area.
Article 4 directions in Milton Keynes
16 Article 4 direction areas
Listed buildings in Milton Keynes
There are 1,110 listed buildings in Milton Keynes. 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 Milton Keynes's conservation team before starting any work on a listed property.
Planning application statistics
Year ending September 2025 | Source: MHCLG planning application statistics
Milton Keynes received 1,190 planning applications and decided 1,131 in the year ending September 2025. The approval rate of 87.4% 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.
Milton Keynes approved 87.4% of applications in the year ending September 2025 with a 98.7% delegation rate. Major applications were decided on time in 94.3% of cases, with householder applications at 95.9%. The council processed 1,131 decisions from 1,190 applications, including 665 householder decisions. Housing delivery at 147% demonstrates exceptional development activity.
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 Milton Keynes
Browse what's been approved near you
Seeing what similar projects have been approved near your property can help you understand what Milton Keynes expects in terms of scale, materials, and design. It's also useful for gauging how quickly the council processes applications.
Search planning applications on Milton Keynes'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 Milton Keynes
Housing Delivery Test 2023 measurement | Source: MHCLG
Milton Keynes delivered 6,912 homes against a requirement of 4,710 over the three-year measurement period, giving a Housing Delivery Test score of 147%. This is above the 95% threshold, which means there are no government-imposed consequences for housing under-delivery. Planning applications in Milton Keynes are assessed on their own merits under standard planning policies.
Lawful Development Certificates in Milton Keynes
A Lawful Development Certificate (LDC) is formal confirmation from Milton Keynes 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.
Milton Keynes decided 665 householder applications in the year ending september 2025. Their 8-week performance of 95.9% 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 Milton Keynes
You can apply for a Lawful Development Certificate through the Planning Portal or directly through Milton Keynes'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
Milton Keynes 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 Milton Keynes.
Pre-application advice in Milton Keynes
Milton Keynes offers a pre-application advice service. The fee for householder pre-app advice is From £75 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 →Pre-application advice for householder and commercial developments within the Milton Keynes area.
Planning fees and timelines in Milton Keynes
| 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 Milton Keynes and may change. Building regulations fees are separate — see the building control section below.
Building regulations in Milton Keynes
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 Milton Keynes is provided by Milton Keynes Building Control. You can also use a private approved inspector instead of the council's service.
Building control contact
Milton Keynes planning department
Your building project checklist for Milton Keynes
- Check if your property is in a conservation area — Milton Keynes has 40 conservation areas. Use our free checker or see the list above.
- Check for Article 4 directions at your address — Milton Keynes has 16 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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