For homeowners in Dublin, installing an external air conditioning unit often falls under exempted development, meaning planning permission might not be required for smaller, discreet units. However, this depends on several factors.
You will likely need permission if your property is a flat or apartment, in a designated conservation area, or if the unit is particularly large, on a pitched roof, or less than one metre from your property boundary. Furthermore, Dublin City Council investigates noise pollution, so unit placement and sound levels are important considerations. Always consult the Dublin City Council planning department for definitive advice tailored to your specific situation.