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

• Side extension exceeds half the width of the original house
• Permitted development rights removed by planning condition
• Listed building restrictions
• Outbuilding positioned forward of principal elevation
• Extension on a flat or maisonette
• Dormer facing road

Property Types We Advise On in Hillingdon

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

Frequently Asked Questions

Do I need prior approval for a larger extension?

In some cases, larger home extensions require a prior approval process where neighbours are notified and the council assesses certain impacts.

Are side extensions allowed under permitted development?

Side extensions are permitted in some cases, but must not exceed half the width of the original house and must meet height limits.

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.

Do I need drawings for a Lawful Development Certificate?

Yes. Accurate scaled drawings are required to demonstrate compliance.

Can I extend a house that has already been extended?

Permitted development limits are cumulative, so previous extensions may reduce what is still allowed.

Can I build a wraparound extension without planning permission?

Wraparound extensions often exceed permitted development limits and usually require planning approval.

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.