SiteRep

Do I need planning permission for a new window in Ireland?

Usually not for a like-for-like replacement or a new window in an existing wall opening of an ordinary house, but new windows are more likely to need permission on a protected structure, a shopfront, or where a new window on a side or rear elevation would overlook a neighbour and is tied to a wider extension.

Replacing an existing window with a similar unit in the same opening, or making minor alterations to the external appearance of a house such as changing a window style, is generally exempted development under Class 4 of Schedule 2 to the Planning and Development Regulations 2001, provided the works do not materially affect the external appearance of the house in a way that would be inconsistent with the character of the structure or neighbouring buildings.

Adding a genuinely new window opening in a wall, rather than replacing an existing one, is more likely to be assessed on its own merits, particularly if it is part of an extension or if it faces directly towards a neighbouring house at close range and raises overlooking concerns that a planning authority would want to control through conditions.

Protected structures are treated differently: replacing original windows, even with a similar-looking modern unit, can require planning permission because the exemption for external alterations does not apply where the works would materially affect the character of a protected structure.

When a new window is likely to be exempt

Check the following:

  • It is a straightforward replacement in an existing opening
  • The house is not a protected structure or in an architectural conservation area
  • The new window does not form part of a larger extension that itself needs permission
  • It does not directly overlook a neighbour's private amenity space at close range
  • The external appearance and materials are broadly consistent with the existing house

Where a window forms part of an extension being built under the 40 m² exemption, the extension's own conditions — including minimum distances for upper-floor windows from the boundary — apply to that window specifically.

Protected structures and terraces

If your house is a protected structure, listed in the local authority's Record of Protected Structures, or forms part of a terrace with a shared architectural character, contact the council's conservation officer before changing any window, since even a straightforward replacement can need planning permission in that context.

Sources

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

Related questions

← Back to all questions