They may, but it depends on how the arrangement is structured and whether it qualifies as a residential tenancy under Irish law. Ask for a written agreement clearly separating the tenancy, rent, deposit, purchase option and any rent credited towards the price; do not assume those credits are protected like a deposit. Check whether the tenancy is registered with the RTB and get independent legal advice before paying a substantial amount or signing. Tenancy disputes may fall within the RTB’s remit, while disagreements about the purchase contract may need a solicitor or another legal route.