Do You Need Planning Permission for a Attic Conversion in Ireland?
An internal attic conversion with roof windows (Velux-style) that doesn't change the shape of the roof generally needs no planning permission in Ireland. Adding a dormer, raising the roof, or altering the roof profile requires planning permission.
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 attic conversion
- 1.Exemption covers internal works and roof windows that follow the roof plane; anything altering the roof's shape or height is development needing permission.
- 2.Dormers -- front or rear -- need planning permission (unlike parts of the UK).
- 3.Roof windows to the front may be restricted in ACAs or on protected structures.
- 4.Planning exemption is separate from Building Regulations: converting an attic to a habitable bedroom triggers fire-safety, stairs, insulation, and window-escape requirements, and usually a certified design.
- 5.An attic conversion counts as habitable floor area for a future sale only if it meets building regs -- 'storage' conversions are the workaround, with limits.
Reference: Section 4(1)(h), Planning and Development Act 2000 (works not materially affecting external appearance)
Frequently asked questions
Do I need planning permission for Velux windows?
Generally no -- roof lights that sit flush with the roof plane and don't materially affect the external appearance are exempt. Front-facing roof lights on protected structures or in conservation areas can need permission.
Why do dormers need permission when attic conversions don't?
Because a dormer changes the roof's external shape, that is 'development' with visual and overlooking impacts, so the exemption for internal works doesn't cover it.
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.
