23,000 homes in Dublin have still to be built, despite all having planning permission.
According to recent figures from the Department of Housing only one in three housing units have been completed or are being built.
36,956 homes have been approved in recent years with 13,000 of them being in the last 30 months. Only 21% of them have been completed with just over 5,000 under construction.
64% of houses have yet to begin, amounting to a total figure of 23,700.
The figures also show that in the Dublin City Council area no work has begun on 77% of homes approved, while nothing has started in two thirds of approved buildings in both the Fingal and South Dublin areas.
In Dun Laoghaire Rathdown 6,659 were granted permission and 46% of works have begun.
Between 30,000 and 35,000 houses and apartments are needed every year to meet the demand and dampen house price and rental costs.