No. In Ireland, a landlord generally must give at least 90 days’ written notice of a rent increase, whether the tenancy is short-term or long-standing. A rent review can normally take place no more than once every 12 months, and the notice should state the new rent and the date it will apply. Other rules, including rent caps or exemptions, may apply depending on the property and when the tenancy began. If the notice appears invalid, check the RTB’s current guidance or seek advice from a qualified solicitor.