For most private tenancies in Kilkenny, rent may generally be reviewed only once every 12 months, with any increase limited to the lower of inflation or 2% under the applicable national rent-control rules. Your landlord must normally give at least 90 days’ written notice using the required RTB notice and state the new rent and the date it takes effect. Special rules and exemptions may apply, particularly where a tenancy starts or ends in specific circumstances. Check the current guidance and rent calculator on the RTB website, or speak to a solicitor if you believe the increase is unlawful.