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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 — 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 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
UK48,010 applicationsEngland42,144 applicationsScotland3,261 applicationsWales1,500 applications (this page)Northern Ireland1,105 applications
Other application types in Wales
New Homes
461 applications
Change of Use
492 applications
Commercial & Major Works
300 applications
Demolition
325 applications
Listed Buildings
84 applications
Solar & Renewables
123 applications
Telecoms Masts
26 applications
Agricultural
237 applications
Community & Public Buildings
114 applications
Shopfronts
38 applications
Signs & Adverts
119 applications
Utility & Infrastructure
176 applications
Trees & Landscaping
223 applications
Data updated daily across Wales's active councils.