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What is an Architectural Conservation Area in Ireland?

An Architectural Conservation Area (ACA) is a place, area, group of structures or townscape designated by a local authority because its special character should be preserved, protected or enhanced, similar in concept to a conservation area in other countries. Being in an ACA restricts what counts as exempted development for buildings within it, without individually listing every building as a protected structure.

An Architectural Conservation Area (ACA) is a designation that a local authority can apply, under the Planning and Development Act 2000, to a place, area, group of structures, or townscape whose special character or appearance it wishes to preserve, protect or enhance. Unlike the Record of Protected Structures, which protects individual buildings, an ACA takes a wider, area-based approach, often covering a historic street, square, terrace, or village core where the overall streetscape and setting matter as much as any single building.

ACAs are designated through the Development Plan process, following public consultation, and each one usually comes with a written character statement describing the features, such as building lines, roof forms, materials, boundary treatments, or historic shopfronts, that contribute to its special character. This statement is used by planning officers to assess applications and guide what is considered appropriate within the area.

Not every building within an ACA is individually a protected structure, but the ACA designation itself reduces the scope of exempted development for structures within it, meaning some works that would be exempt outside the ACA can require planning permission inside it. Whether a specific building is also separately listed on the Record of Protected Structures is a distinct question that needs to be checked independently.

What ACA designation typically restricts

Within an ACA, planning authorities commonly restrict or scrutinise:

  • Alterations to windows, doors and shopfronts visible from public areas
  • Painting or rendering of previously unpainted or unrendered facades
  • Removal of boundary walls, railings or historic paving
  • Roof alterations, dormer windows and rooflights on front or prominent elevations
  • Advertising signage and external lighting
  • Demolition of structures that contribute to the area's character

How ACAs relate to protected structures

An individual building can be both within an ACA and separately listed as a protected structure, in which case both sets of controls apply, or it can be in an ACA without being separately protected, in which case only the ACA-related restrictions on exempted development apply. Checking both the ACA character statement and the Record of Protected Structures is the only reliable way to understand what controls affect a specific property.

Sources

Last reviewed 24 August 2026. General information only — not legal or planning advice.

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