For an existing private tenancy in Waterford, rent can generally be reviewed only once every 12 months and the increase is capped at 2% or the applicable HICP inflation rate, whichever is lower. Your landlord must give the required written notice, including the new rent and the date it will apply, and follow the statutory notice period. Some properties or tenancy situations may be exempt, and different rules can apply when setting rent for a new tenancy. Check the latest guidance on the RTB or ask a solicitor if you believe the increase is unlawful.