If your property is in a designated Kilkenny Rent Pressure Zone, rent reviews are generally limited by the statutory cap, currently the lower of 2% or the annual change in the Harmonised Index of Consumer Prices (HICP). A rent review can normally take place no more than once every 12 months, and your landlord must serve the required notice and supporting information. Different rules and exemptions may apply depending on when the tenancy began and whether the property qualifies for an exemption, so check the latest guidance and calculator on the RTB or gov.ie websites. If you believe the increase is unlawful, the RTB dispute resolution process can assess the individual tenancy facts.