As part of Budget 2017, the government is allocating $4 billion in new capital spending in a bid to build infrastructure 'for a growing economy”.

Finance Minister Steven Joyce says this $4b investment is the single biggest investment of new capital in one Budget by any government in decades - and it's just the beginning.

'We have reserved a further $7b in new capital for the following three Budgets.”

Budget 2017 also lays out for the first time the government's total investment in new capital infrastructure over the forecast period.

'The government will invest a total of $32.5b over the next four years in new infrastructure, which is a 40 per cent increase on the last four years. This investment will be made through core government agencies, plus the big infrastructure agencies, like NZTA, KiwiRail and Housing New Zealand.

'The New Zealand Transport Agency alone will invest $9.17b in new State Highways over the next four years, and will open over 540 lane kilometres of new highways.

'And Housing New Zealand will invest $2.2b in the Auckland Housing Programme as announced by Minister Adams last week.”

Of the $32.5b programme, $1.7b is being funded through public-private partnerships including the Transmission Gully and Pūhoi to Warkworth roading projects.

Steven says the government intends to leverage its already significant infrastructure investment through the further use of public-private partnerships and joint ventures between central and local government and private investors to deliver an even larger infrastructure programme.

'One of the benefits of a strong economic plan and strong growth is the capacity to build the new infrastructure that people expect in a modern successful economy.

'We see that in new roads, new trains, new schools and hospitals, and big recent investments in electricity transmission and ultrafast broadband.”

The new capital spending in Budget 2017 includes:

• $812 million for the reinstatement of State Highway One north and south of Kaikōura.
• $450m for rail infrastructure and rolling stock for KiwiRail's rail network around New Zealand.
• $436m for the first stage of Auckland's City Rail link which will greatly boost the capacity of the commuter rail network in central Auckland.
• $98m for upgrades to Wellington's commuter rail network.
• $392m for six new schools, two school expansions, 11 special education satellite units, and 305 additional classrooms nationwide.
• $150m in additional capital towards the new building programme for hospitals around New Zealand.
• $576m for the Defence Forces for new equipment and the commencement of the upgrading of the Defence Estate.
• $763m for new prison capacity around New Zealand.
• $100m to expand the government's programme to release Crown land for housing development around the country.
• $63m for investing in new water storage infrastructure in regional New Zealand.