Fianna Fáil says it has "grave concerns" over new Central Bank mortgage rules.
The regulations will make it difficult for renters in Dublin to buy a home.
The new rules will allow first time buyers to borrow up to 90 per cent of the value of a house worth up to 220-thousand euro but Dublin has the highest property prices in the country.
Other buyers will be forced to save a 20 per cent deposit on the property's value making it difficult for families who want to trade up.
Party Finance Spokesperson Michael McGrath says the new rules are tough.
