In Ireland, rent can generally be reviewed no more than once every 12 months, subject to the rules applying to the tenancy. For most private tenancies, an increase is also limited by the applicable rent-control cap, such as the lower of inflation or 2%, and the landlord must give the required notice using the prescribed process. Different rules may apply in specific circumstances, including certain new tenancies or exempt properties, so check the latest guidance on the RTB or gov.ie. Whether an increase is valid can ultimately be decided through the RTB dispute resolution process.