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Get free email alerts for new extensions applications in the UK
Set up alertsFrequently asked questions
When do you need planning permission for a house extension?
Single-storey rear extensions up to 4m (detached) or 3m (semi-detached / terraced) are usually permitted development. Two-storey extensions, anything in a conservation area, or larger projects almost always need a planning application.
What's the difference between planning permission and permitted development?
Permitted development rights let you build certain things without applying for planning permission, subject to specified limits. Anything outside those limits — taller, larger, in a protected area — needs full planning permission.
How long does a householder application take?
The statutory target is 8 weeks from validation. Most simple householder extensions are decided within that window; complex or contested cases (especially with objections) can take longer.
Can I get email alerts for extensions planning applications anywhere in the UK?
Yes. Click the "Set up alerts" button on this page and you'll get a daily (or weekly) email listing every new extensions application submitted anywhere in the UK. No need to pick a postcode or draw a map — pick the category once, choose your frequency, and we'll do the rest.
Extensions planning applications elsewhere
UK51,643 applications (this page)England45,560 applicationsScotland3,276 applicationsWales1,695 applicationsNorthern Ireland1,112 applications
Other application types in the UK
New Homes
10,400 applications
Change of Use
9,647 applications
Commercial & Major Works
5,608 applications
Demolition
9,824 applications
Listed Buildings
3,050 applications
Solar & Renewables
2,518 applications
Telecoms Masts
1,489 applications
Agricultural
3,903 applications
Community & Public Buildings
2,253 applications
Shopfronts
879 applications
Signs & Adverts
3,659 applications
Utility & Infrastructure
5,037 applications
Trees & Landscaping
18,087 applications
Data updated daily across all UK active councils.