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Do I need planning permission for a rooflight in Ireland?

Usually not. A rooflight fitted flush with the existing roof slope, without projecting above it, is exempted development under Class 8 of Schedule 2 to the Planning and Development Regulations 2001, subject to limits on the number and size of openings and distance from the roof edge.

Class 8 of Schedule 2 to the Planning and Development Regulations 2001 (as amended) exempts alterations to the roof of a house, including the insertion of rooflights, where the work does not materially alter the shape of the roof and the rooflight does not project vertically above the plane of the roof.

Conditions typically limit how much any rooflight can project outward from the roof surface, require a minimum distance from the eaves and verge, and — for rooflights on a roof plane facing a road — can restrict the extent of alteration to the roof more tightly than on a rear-facing plane, since visibility from the public realm is a relevant factor.

A rooflight is different from a dormer window: because a rooflight sits flush with the roof slope and a dormer projects outward from it to create standing headroom, dormers are treated as a materially greater alteration and are generally not covered by the same exemption.

Conditions for an exempt rooflight

Check these before installing one:

  • The rooflight is flush with, and does not project above, the plane of the existing roof
  • It does not materially alter the shape of the roof
  • It sits at a suitable distance from the eaves, ridge and verge as set out in Class 8
  • The roof is not on a protected structure
  • Multiple rooflights together do not amount to a substantial alteration of the roof
  • The house is not subject to a planning condition restricting roof alterations

Rooflights are the most straightforward way to bring natural light into an attic space without triggering a full planning application, provided the flush-fitting condition is respected.

If you want more headroom than a rooflight gives

If a rooflight alone will not give the headroom you need and a dormer is being considered instead, plan for a full planning application from the outset rather than assuming the rooflight exemption will stretch to cover it.

Sources

Last reviewed 20 August 2026. General information only — not legal or planning advice.

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