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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
UK60,937 applicationsEngland53,993 applicationsScotland3,985 applicationsWales1,955 applicationsNorthern Ireland1,004 applications (this page)
Other application types in Northern Ireland
New Homes
816 applications
Change of Use
232 applications
Commercial & Major Works
278 applications
Demolition
339 applications
Listed Buildings
19 applications
Solar & Renewables
56 applications
Telecoms Masts
16 applications
Agricultural
174 applications
Community & Public Buildings
138 applications
Shopfronts
25 applications
Signs & Adverts
125 applications
Utility & Infrastructure
120 applications
Trees & Landscaping
21 applications
Data updated daily across Northern Ireland's active councils.