In Dublin, a landlord generally must serve a written Notice of Termination and give the correct notice period, which ranges from 28 to 224 days depending on how long the tenancy has lasted. The notice must usually state the termination date and, where required, the legal reason for ending the tenancy; a copy should also be sent to the RTB within the required timeframe. Rules can depend on when the tenancy began and the reason given, so check the current guidance on the RTB website. If you believe the notice is invalid, the RTB or a qualified solicitor can assess the individual circumstances.