Details of plans to build 50,000 new homes on over 700 public land sites around the country have been released.

The Department of Housing has published a land map showing the sites due to be developed under public-private partnerships.

They include CIÉ train stations in Dublin, Cork and Galway and ports in Galway and Cork.

The map will also show details of PPP projects going ahead, including the provision of 3,000 social and affordable homes in four sites owned by local authorities in Dublin: Kilcarbery in South Dublin, and Infirmary Road, Emmet Road and Oscar Traynor Road in Dublin City.

A number of left-wing groups have criticised the PPP plans as a privatisation of public land.

People Before Profit Cllr John Lyons, speaking at the announcement of a Mayday housing and homelessness march in Dublin, said previous PPP plans which relied on the private sector to build old social housing had failed.

He said local authorities building their own housing would be a better deal for the taxpayer.

Minister for Housing Simon Coveney said the housing plans should not be an ideological issue.

He said the deals should be open and transparent with some involving the sale of public land but some where local authorities are retaining ownership.

The minister also admitted that homelessness figures are "going the wrong way" with increases for both families and single adults.

He said new facilities to get families out of hotels will be unveiled shortly, but said there will not be any "queue jumping".

"I don't want to create the impression that people who become homeless get priority over everyone else," he said.

The Sinn Féin spokesperson on Housing, Planning and Local Government has said the Government's plan to build 50,000 new homes on public land around the country is the wrong way to use such a valuable asset and 'won't work' in the long term.

Speaking on RTÉ’s Drivetime, Deputy Eoin Ó Broin said that there are more cost-effective ways to provide housing and the money should be used to develop high quality and vibrant council-led mixed tenure estates.

These would include a mix of social and affordable houses.

He said by giving the private sector such a central role in developing the sites, there will be less social and affordable houses and no affordability guarantees.

He said it would be better for local councils to develop the houses, claiming that this would save between €50,000 to €100,000 euro per unit.

Deputy Ó Broin said a local authority can provide a good quality family home for €200,000 - a cost quoted as €300,000 to €360,000 by industry.

He accused the Government of offloading the financing and ownership of these houses to the private sector.