Permitted Development Extensions in Milton Keynes

We provide clear, professional guidance on permitted development extensions in Milton Keynes and surrounding areas. Whether you’re planning a rear, side, or two-storey extension, understanding local planning constraints and national permitted development limits is essential before work begins.

Common Permitted Development Issues in Milton Keynes

• Overlooking concerns from upper floor windows
• Raised decking exceeding permitted height
• Outbuilding positioned forward of principal elevation
• Roof alteration exceeding permitted cubic volume
• Overall height above permitted maximum
• Incorrect measurement from original dwelling

Property Types We Advise On in Milton Keynes

• Victorian properties
• Edge-of-settlement homes
• Chalet-style houses
• 1930s suburban homes
• Properties with outbuildings

Frequently Asked Questions

What is a Lawful Development Certificate?

A Lawful Development Certificate provides formal confirmation from the local authority that your extension complies with permitted development rules.

Is there a limit on total site coverage?

Yes. Extensions and outbuildings combined must not cover more than 50% of the curtilage of the original house.

How is the original house defined for measurement purposes?

The “original house” refers to the property as it stood on 1 July 1948 or when it was first built, not including later extensions.

Can I add a balcony to my extension?

Balconies and raised platforms are not permitted development and usually require planning permission.

How high can my extension be?

Height limits vary, but rear extensions under permitted development generally cannot exceed four metres for detached houses or three metres for others.

What is the difference between planning permission and building regulations?

Planning permission controls development impact, while building regulations ensure structural safety and compliance.

If you're planning an extension in Milton Keynes and want to confirm whether it qualifies under permitted development rules, request a free assessment today and get clarity before you build.