Limerick is covered by Ireland’s national rent-control rules, so a landlord generally cannot increase rent by more than 2% or the rate of inflation, whichever is lower, and normally only once in a 12-month period. The landlord must give at least 90 days’ written notice, explain how the new rent was calculated and send a copy of the notice to the Residential Tenancies Board (RTB). Different rules can apply in limited circumstances, such as certain new tenancies or substantial changes to the property. Check the RTB’s current guidance, or speak to a solicitor if you believe the increase is unlawful.