Castleknock is a premium Dublin 15 suburb bordering the Phoenix Park, with mature housing and strong family demand. Rents are noticeably higher than neighbouring Blanchardstown. Supply is limited. A national rent cap applies since March 2026, limiting increases to the lower of 2% or inflation.
Rent may be reviewed once every 12 months. Use the rent increase checker to see whether a proposed increase is within the legal limit.