Plans for more than 200 new houses, including 137 social housing units, have been approved by Dublin City Council.
In Crumlin, 152 new homes will be built, half of which will be available for social housing.
The other half will be constructed for the cost rental scheme.
46 one bedroom apartments for older people will be built in Cabra while 12 new apartments have got the green light in Coolock.
Construction on 3 family houses on Sackville Avenue, which were on the Council’s waiting list, will begin as soon as possible.
Lord Mayor of Dublin Hazel Chu described the milestone as a "key milestone" in the development of the city's housing.
"We meed much more of this and we need to speed up our very significant delivery pipeline where possible," she said.
