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Get free email alerts for new extensions applications in Northern Ireland
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 Northern Ireland?
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 Northern Ireland. 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 applicationsNorthern Ireland1,105 applications (this page)
Other application types in Northern Ireland
New Homes
727 applications
Change of Use
204 applications
Commercial & Major Works
269 applications
Demolition
342 applications
Listed Buildings
16 applications
Solar & Renewables
52 applications
Telecoms Masts
22 applications
Agricultural
172 applications
Community & Public Buildings
118 applications
Shopfronts
23 applications
Signs & Adverts
142 applications
Utility & Infrastructure
106 applications
Trees & Landscaping
27 applications
Data updated daily across Northern Ireland's active councils.