The Chair of Dublin City Council's Housing Committee has said deep concerns were expressed at a council meeting about plans to locate modular homes at five Dublin sites.
The council met to discuss plans around the introduction of modular homes.
Councillor Daithí Doolan said Dublin City Management were left "under no illusions" about his concerns that some of the sites were unacceptable.
A report presented to councillors tonight identified five modular housing sites in Poppintree in Ballymun; Mourne Road in Crumlin; Belcamp Avenue in Coolock; St Helena's Drive in Finglas; and Cherry Orchard in Ballyfermot.
Mr Doolan said that were already housing plans in place for all five sites, a co-operative development in Poppintree in Ballymun, and social housing on all of the other sites, including one plan for senior social housing.
He said that councillors expressed the view that these modular housing sites should not become permanent fixtures.
There were also repeated calls on the minister to release promised funds to build permanent social housing.
22 of the pre-fabricated units are to be delivered by the end of the year, with 128 to be fast-tracked soon after.
The report on modular housing says families will have to pay some form of rent and will be assigned a support team to assist them moving.
It also says that the units could be used in the long-term as standard social housing or student accommodation.
DCC Management is due to respond to concerns raised by councillors about plans for modular housing sites in writing.
Councillors also proposed to review the implementation of the plan in twelve months.
Meanwhile a housing alliance has said it has planning permission to build co-operative housing on one of the sites selected by Dublin City Council for modular housing.
Hugh Byrne of the O'Cullen Co Housing Alliance told RTÉ News that planning permission for 44 houses had been obtained for the site at Poppintree 6b, the site in Ballymun selected as a site for modular housing.
Mr Byrne said that the permission was obtained in 2007, it was extended in 2012 and it will expire in May 2017.
Mr Byrne said that he was not opposed to the provision of modular housing at the site or elsewhere, and that he would like to see that housing integrated into their own plans.
Mr Byrne said it was incorrect to describe modular housing as temporary.
Earlier, People Before Profit Councillor Tina McVeigh told RTÉ a permanent solution to the homelessness crisis still hasn't been proposed.
She said: "We should be providing them with permanent sustainable homes in communities that they can live in. Essentially we're just tinkering around the edges.
"22 units by Christmas - fantastic - but that's just a quarter of the families that became homeless in this city in August."
Councillor McVeigh said that families' lives were still being put on hold and it was unfair that people were being asked to pay an accommodation charge to the council which, she said, raised questions as to the status of the accommodation.