Free Tool · 60 seconds
Do I need planning permission?
An interactive check based on Ireland's exempted development rules — the same national tests apply no matter where you live. Tell us about the project and we'll show you the statutory criteria, the likely answer, and what to do next.
What are you planning to do?
Pick the option that best fits your project.
Your result
Pick a project and property type, then run the check.
The 40 m² rule
Class 1 of Schedule 2 lets you build extensions up to 40 m² without permission, counting all extensions added since 1 Oct 1964 — not just the new one.
Building Regulations still apply
Exempt from planning ≠ exempt from building control. You still need a BCMS commencement notice and an engineer's certification for structural work.
Section 5 Declarations
If you're unsure, a Section 5 Declaration costs around €80 and gives you a binding answer in 4 weeks. Cheaper than gambling on retrospective permission.
Got an answer? See what your project will cost.
Run a cost estimate →