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Get free email alerts for new extensions applications in Wales
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, whether taller, larger or 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 those drawing a lot of comments, can take longer.
Can I get email alerts for extensions planning applications anywhere in Wales?
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 Wales. 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
UK57,574 applicationsEngland50,979 applicationsScotland3,765 applicationsWales1,883 applications (this page)Northern Ireland947 applications
Other application types in Wales
New Homes
466 applications
Change of Use
659 applications
Commercial & Major Works
378 applications
Demolition
402 applications
Listed Buildings
199 applications
Solar & Renewables
163 applications
Telecoms Masts
34 applications
Agricultural
344 applications
Community & Public Buildings
166 applications
Shopfronts
47 applications
Signs & Adverts
149 applications
Utility & Infrastructure
213 applications
Trees & Landscaping
331 applications
Data updated daily across Wales's active councils.