There is no single official “average rent increase” figure for Louth, as changes vary by property, tenancy and date. The RTB/ESRI Rent Index can help you compare typical rents in Louth, but it does not decide whether a particular increase is lawful. For most existing private tenancies, rent generally cannot rise by more than the lower of 2% or inflation in a 12-month period, subject to current rules and exemptions. Check the RTB’s guidance or speak to a solicitor if you believe your notice is invalid; the RTB ultimately decides disputes based on the facts.