For most private tenancies in Louth, rent can generally be increased by no more than 2% or the annual HICP inflation rate, whichever is lower, and usually only once every 12 months. Your landlord must serve a valid written rent review notice at least 90 days before the increase takes effect and send a copy to the RTB on the same day. The notice should explain the calculation and comply with the current national rules. If you believe an increase is invalid, check the RTB guidance or consider seeking advice from a housing adviser or solicitor; the RTB decides disputes based on the tenancy’s facts.