The RTB Rent Index is a useful starting point for comparing rent levels and trends across regions, but compare similar properties, tenancy types and time periods. A higher regional average does not by itself show that a particular rent increase is lawful or reasonable. For an individual tenancy, check the current rent-setting rules, notice requirements and any applicable limits on the RTB and gov.ie websites. If the increase appears incorrect or you cannot resolve it with your landlord, the RTB dispute resolution process can consider the specific facts.