There is no single official average rent increase for Waterford: market movements vary by property type and location, so check the latest RTB Rent Index for local figures. The amount your landlord may charge is governed by the rent-increase rules applying to your tenancy, including the relevant cap and how often a review is allowed. A rent review generally requires proper written notice and supporting information, and the increase cannot simply be based on what a landlord chooses. For your exact position, check the RTB or gov.ie guidance; any dispute is ultimately decided through the RTB process or by a solicitor based on the tenancy’s facts.