Year-on-year rent increases in Ireland vary by location, property type and whether the tenancy is new or ongoing, so a national average may not reflect your home. Official RTB and CSO rental data can help show market trends, but an average does not by itself determine whether a proposed increase is lawful. For an existing tenancy, the landlord must follow the rent-review rules and limits applying to that tenancy, including the required notice and any applicable Rent Pressure Zone or national restrictions. Check the latest guidance on RTB.ie or gov.ie, and consider speaking to a qualified adviser if you believe the increase is invalid; the RTB ultimately decides disputes based on the individual facts.