Almost 200 extra emergency beds and 55 units for families and couples have been confirmed for the Dublin region as part of this year's Cold Weather Initiative.
The Dublin Regional Homeless Executive has said most of the beds will become available from this month and stay open to the end of April.
It said there will be at least 100 single beds for men and women at a temporary night shelter in Dublin city. The beds in Thomas Street will be available later this month.
75 more will be ringfenced across all homeless services.
37 family units are opening in Glasnevin and Ballymun Plaza, which started taking in people in the past few days.
18 long-term units for couples will also open on Sean McDermott Street later this month.
A further 20 single beds will be put in place by the Civil Defence during the extreme cold weather and a further 80 rooms are yet to be confirmed for families.
The Peter McVerry Trust paid tribute to the executive saying it had done an excellent job in securing additional capacity in extremely difficult circumstances.
The Trust accused the Government of failing to stem the flow of people into homelessness describing this as "scandalous".
Chief Executive Pat Doyle said: "In the first nine months of 2015, the homeless sector in Dublin has moved 729 people out of homelessness, an increase of over 200 on the same period last year.
"Despite that increase and despite the 271 new beds added to the homeless system in Dublin last winter, we face a situation where we need to add an even larger number this winter."
"The reality is that the Cold Weather Initiative is planning to provide additional homeless accommodation to over 500 people between now and Christmas.
"That in itself is a scandalous reflection of the failure by Government to protect those most at risk in Irish society."
Mr Doyle called on the Government to increase rent supplement rates, to immediately introduce rent certainty and to progress modular and traditional housing much quicker than is currently the case.
"If housing supply was the only issue involved in tackling homelessness then we wouldn't have had 5,000 homeless people at the height of the housing boom," he said.
The Director of the Executive Cathal Morgan said that at a minimum there are 105 people sleeping rough and this initiative will make sure there is adequate accommodation for them during the winter months.
Speaking on RTÉ's Morning Ireland he said it was concerning that emergency beds were still being put in place and greater emphasis should be put on long term solutions.
He said that from 24 November there will be a bed available for everyone sleeping rough in Dublin.
Minister says housing supply is key issue in homelessness crisis
Minister for the Environment Alan Kelly has said he believes there is a necessity for a package of proposals that will ensure that people can stay in their homes and so that the Government can stem the tide in regard to the volume of people coming into homelessness services.
Mr Kelly said more people were coming into homelessness due to escalating rents and the issue of supply.
He said long term the solution to this is supply but in the short term it must be ensured that more people are not falling out of the rental sector.
Across Government, he said, there is a determination to put together a plan to ensure it can be addressed in the short term while supply is still forthcoming.
Asked about rent certainty, Mr Kelly said a range of issues were being discussed across Government, including supply and rent.
Mr Kelly said in excess of 250 units for individuals, for couples, or for families have been announced as part of a package and the Government expects to have more.
He said he committed last year that the Government would put together a package to help with those who were sleeping rough and if anyone wanted a bed the Government would do everything to make sure that they would have a bed.
He said the Government was showing that it had lived up to that today.
The minister said a whole range of units had been brought together across the city, which he said would help with those people who find themselves in very difficult circumstances.
Mr Kelly said there were discussions ongoing into trying to stop the flow of people into homelessness.
He said he had had discussions in the past few days and the discussions would come to fruition
He described the volume of people coming out the other side of homeless services as 'very encouraging.' He said in excess of 700 had come out the other side.
Homelessness campaigner Fr Peter McVerry, meanwhile, has said that he supports Mr Kelly, saying he is the only minister who understands the homelessness problem.
He told RTÉ’s News At One that he does not believe the Government's strategy on homelessness is working, and described suggestions that the Government will not provide rent control as a disaster.
Fr McVerry said that Mr Kelly cannot get other ministers to agree with what he would like to do which, Fr McVerry believes, would be significant in tackling homelessness.
He said while families are flooding into homelessness, ministers are bickering, arguing and disagreeing with one another, saying "Nero fiddles while Rome burns".
He said it is a disgrace and that the homelessness situation is beyond crisis point.
Government labeled incoherent, incohesive and chaotic
Meanwhile, the Taoiseach has expressed his "hope" that discussions between Mr Kelly and Minister for Finance Michael Noonan regarding the housing crisis will conclude this week.
Mr Kenny was responding to Sinn Féin President Gerry Adams who asked the Government to introduce rent certainty.
Mr Adams described the Government as incoherent, incohesive and chaotic regarding the matter.
He suggested that Fine Gael was refusing to allow the Mr Kelly, a Labour minister, to fulfill his promise to introduce rent certainty.
Mr Adams said 24 Fine Gael Oireachtas members are landlords and he questioned if the introduction of rent certainty would be Labour’s way or Fine Gael’s way.
The Taoiseach said it certainly would not be Sinn Féin's way.
He said the Government would not do anything to make the situation worse.
He repeated his assertion that talks between ministers Kelly and Noonan should end this week.
Independent TD Mick Wallace called on the Taoiseach to stall Project Arrow - mainly non-performing loans with an original value of €6.25bn which is being sold by NAMA - to evaluate what units could be used for social housing.
He put it Mr Kenny that the units could help the problem of homelessness.
The Taoiseach said 200 sites would be opened next year for the provision of social housing adding that NAMA intended to "open" 100 sites mainly in Dublin.
