Do You Need Planning Permission for a Garden Room in Ireland?
A garden room needs no planning permission in Ireland if all garden structures combined stay at or under 30 sq m, it sits behind the house, and it is under the height limits (4m pitched / 3m flat roof). Using it as your own office is fine; using it for sleeping or a business with visitors is not exempt.
Rules have conditions, and the conditions are where projects fail. Answer a few questions about your exact situation and get a plain-English answer with the regulation cited.
Check your project freeThe rules for a garden room
- 1.The 30 sq m cap covers the garden room PLUS every existing shed and outbuilding.
- 2.Behind the front building line, keeping at least 25 sq m of garden.
- 3.Working in it yourself (remote work, freelancing) keeps it within the exemption; regular clients or employees on site is a material change of use.
- 4.Sleeping accommodation -- a guest room, teenager's bedroom, or Airbnb unit -- is 'human habitation' and is not exempt at any size.
- 5.Plumbing for a bathroom or kitchenette is a red flag councils treat as evidence of habitable use.
- 6.Not exempt on protected structures or in ACAs.
Reference: Class 3, Schedule 2, Part 1, Planning and Development Regulations 2001
Frequently asked questions
Can I use a garden room as a home office without planning permission?
Yes, if the structure itself qualifies (30 sq m total, behind the house, height limits) and the use stays incidental -- you working at a desk. Employees working there or clients calling regularly would need permission.
Can someone sleep in a garden room?
Not under the exemption. Garden structures must not be used for human habitation. A sleeping-accommodation garden room needs planning permission regardless of size.
Turns out you need permission?
Start with the pre-submission checklist, estimate costs with the fee calculator, and read the step-by-step application guide. For uncertain cases, a Section 5 Declaration from your council (~€80) gives a formal ruling either way.
Need help with your application?
Tell us about your project and we'll connect you with an architect or planning consultant in your county. Free, no obligation.
Related projects
This page is general guidance on the Planning and Development Regulations 2001 (as amended), not legal advice. Exemptions do not apply to protected structures or in Architectural Conservation Areas, and conditions apply in every case. Confirm with your local authority before starting work.
