The next Dutch government will have to invest almost €20bn to facilitate several major housing and infrastructure in the coming years, according to a report drawn up on behalf of housing minister Kajsa Ollongren.

Without a significant contribution from the state, new homes may not be built at the rate required and they will be more expensive than planned, the report, by the Rebel research group, said. Several of the projects are located in the Holland Metropole region.

In total, the 14 projects in the study involve building 436,000 new homes around the bigger Dutch cities, of which 210,000 can be completed by 2030 and 70% will be classed as ‘affordable’.

Most of the funding – €109bn of the €142bn – will come from private sources and local authorities will contribute €13.7bn. The rest of the money  – the equivalent of roughly €15,000 per property –  will need to come from central government resources, the report said.

The report includes €33bn for the cost of public infrastructure projects surrounding the developments, including expanding the Amsterdam metro system to Schiphol airport and a direct train link between Amsterdam and Almere.

It will be up to the next coalition to decide what what should happen next, Ollongren said in a reaction.

In February, an alliance of developers, construction companies, lobby groups, housing corporations and tenants associations said that one million new homes need to be built in the the Netherlands in the next 10 years to meet demand.

The organisations hope their plans will form the backbone of the next government’s strategy on housing.