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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
UK49,495 applicationsEngland43,675 applicationsScotland3,035 applicationsWales1,699 applicationsNorthern Ireland1,086 applications (this page)
Other application types in Northern Ireland
New Homes
757 applications
Change of Use
221 applications
Commercial & Major Works
276 applications
Demolition
352 applications
Listed Buildings
21 applications
Solar & Renewables
50 applications
Telecoms Masts
21 applications
Agricultural
193 applications
Community & Public Buildings
115 applications
Shopfronts
25 applications
Signs & Adverts
143 applications
Utility & Infrastructure
105 applications
Trees & Landscaping
31 applications
Data updated daily across Northern Ireland's active councils.