Permitted Development Extensions in Hillingdon

We provide clear, professional guidance on permitted development extensions in Hillingdon 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 Hillingdon

• Prior approval required but not obtained
• Incorrect measurement from original dwelling
• Extension on a flat or maisonette
• Overlooking concerns from upper floor windows
• Two-storey extension too close to rear boundary
• Listed building restrictions

Property Types We Advise On in Hillingdon

• New build developments
• Edge-of-settlement homes
• Properties with previous extensions
• Semi-detached houses
• Rural properties

Frequently Asked Questions

Does permitted development apply to HMOs?

Some permitted development rights may be restricted depending on property use class.

Can I extend in a National Park?

National Parks have stricter controls and reduced permitted development rights.

What is the difference between planning permission and building regulations?

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

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.

Can I build right up to my boundary?

It depends on height and location. Boundary proximity affects allowable eaves height.

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.

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