RPZs are designated by the Minister for Housing under legislation, using prescribed rent and market conditions rather than a landlord’s choice. They are generally drawn around local electoral areas, so a boundary may follow an administrative line and place neighbouring streets, or nearby properties, in different categories. Check the official RPZ map and list of designated areas using the property’s exact address on gov.ie or the RTB website. Whether RPZ rules apply to a particular tenancy can depend on its facts, so consider getting advice from a qualified solicitor or Threshold if the position is unclear.