Minister for Housing Eoghan Murphy has said the Government is going to miss its deadline of 1 July for moving homeless families from temporary hotel accommodation.
He said the 650 families involved will be moved straight into family hubs or other accommodation or they will be notified in writing of where they are going in the coming weeks.
He said the Government is giving an extra €10 million for the family hub programme to create space for another 200 families on top of the 600 already going into such accommodation.
Sinn Féin's Housing Spokesperson said it is "deeply disappointing" for the families who were led to believe they would have permanent homes by the end of the month.
Speaking on RTÉ's Drivetime, Eoin Ó Broin said a vacant property tax should be introduced to push people "wilfully sitting" on vacant units into active use.
He said a scheme to help people to renovate old houses for sale purposes is chronically underfunded.
Mr Ó Broin said that moving families from one emergency accommodation to another simply is not acceptable and shows a lack of urgency in acquiring homes "that people absolutely need."
Mr Murphy had been speaking at the opening of 28 housing units in the grounds of Harold's Cross Hospice in Dublin.
The units are owned and operated by Focus Ireland and built on a site donated by the Sisters of Charity.
Mr Murphy said that the review of rebuilding Ireland is continuing and it is a good time to look at what new measures or powers might be needed.
He said the Taoiseach has told him to think big and no idea is too radical.
Minister Murphy said he will be speaking to Attorney General Seamus Woulfe about new powers and to Minister for Finance Paschal Donohoe about new measures, which he said he will outline within months.
Speaking at the event, Focus Ireland founder Sr Stanislaus Kennedy said all government policies need to be "homeless-proofed".
She said the biggest problem causing homelessness is housing being taken out of the rental market and people being evicted when let properties are sold.
This she said would keep 20 families a month from becoming homeless and said the law needs to be changed.
St Stan also said there needs to be incentives for people to rent out empty homes, and penalties should be introduced for those hoarding building lands.
Meanwhile, the head of advocacy at Focus Ireland has said the minister should not be dealing with the quality of emergency accommodation but rather he should be focusing on a long-term solution to the housing crisis.
Speaking on RTÉ's News at One, Mike Allen said middle-ranking officials should be tasked with ensuring a high quality of emergency accommodation, rather than the Mr Murphy concentrating his efforts in this way.
Mr Allen said there is an "obsession around the use of commercial hotels" but he said homeless families do not care about that, "they care about when they're going to have a home, where they're going to school."
He said the minister needs to be ambitious in his thinking of how to address the homeless issue.
Mr Allen also said that "changing the housing ministers every year is a problem" given that the complications surrounding the issue of housing will "take years to resolve."