There is no single official “average rent increase” for Galway, because figures vary by property type, location and whether the tenancy is new or ongoing. The RTB Rent Index is the best starting point for comparing typical market rents in Galway, but it does not by itself decide whether a particular increase is lawful. Your landlord must follow the rent-setting rules and notice requirements that apply to your tenancy, including any statutory limit or permitted review process. If you believe the increase is invalid, check the current guidance on RTB.ie or consider getting advice from a housing adviser or solicitor; the RTB dispute process can determine the issue based on the tenancy’s facts.