Do I need planning permission to convert a house into apartments in Ireland?

Subdividing a single dwelling into multiple self-contained apartments or flats is treated as a material change of use, and usually also involves physical works such as new kitchens, bathrooms, and separate entrances, all of which require planning permission from the local authority. This is because multi-unit occupation raises different considerations from single-family occupation, including parking provision, bin storage, fire escape routes, and overall density on the site.

Local authorities assess these applications against the standards in their county or city development plan, which often set minimum floor areas per unit, private amenity space requirements, and parking standards, and some plans specifically discourage or restrict the subdivision of certain house types or in certain residential areas to protect housing mix and character. Applicants should also budget for compliance with the Building Regulations, particularly Part B (fire safety), which becomes significantly more demanding once a building is split into separate dwelling units with shared circulation spaces.

Because rules and appetite for house-to-apartment conversions differ between local authorities, and because some areas actively encourage this kind of conversion to increase housing supply while others are more restrictive, it is worth having a pre-application discussion with the planning department before committing to detailed design and application costs.