Building advice
Guides tagged Extensions
Every guide on this site that touches extensions, written for homeowners in Belfast and across Northern Ireland.
Do I Need Planning Permission for an Extension in Northern Ireland?
Permitted development in Northern Ireland is not the same as England. Here are the limits that matter, who decides, and what removes your rights entirely.
How Much Does a House Extension Cost in Belfast in 2026?
What a single-storey extension actually costs in Belfast in 2026, with rates per square metre, a worked 25m² example and where every pound of it goes.
Next step
Know the number before you ring a builder
Reading is one thing. Put your own dimensions into a calculator, get a costed range with every line broken out, then ask three local builders to price the same specification.