Some tenants could face higher rent increases than new limits being introduced by the government.
New legislation limiting the rise in the cost of renting in rent pressure zones, to two per cent or the rate of inflation, is due to pass in the coming weeks.
However, it's emerged that if rents have not been increased in a number of years, a landlord could combine the increases in one year.
Dr Rory Hearne, Assistant Professor in Social Policy in Maynooth University says that means significant increases could still be on the cards for some:
"If you haven't increased the rent last year or previous years, you could compound it - so you could be seeing people with rents increasing anything from 4%, 6% or 8%.
"The other issue is there's other loopholes as well. The new cap of 2% will not apply to new property that is being developed or let."