There is no single official average rent increase for Cork, as changes vary by property type, location and tenancy. The RTB Rent Index can show market rents for new tenancies, but this is different from the amount a landlord may charge an existing tenant. For most existing private tenancies, rent increases are generally limited to 2% or inflation, whichever is lower, subject to the tenancy’s circumstances and any exemptions. Your landlord must also follow the required notice rules; check the latest guidance on RTB.ie or speak to a solicitor if you believe the increase is unlawful.