However, he said that targeted changes, rather than rushed reforms, were needed.
"There is no doubt that a reform of planning rules is long overdue but radical and comprehensive reforms are both unnecessary and could result in lasting damage, both through project delays whilst major reforms are implemented and poor planning decisions," he said.
"Instead, as we emerge from three months of catastrophic uncertainty, what are needed right now are some carefully targeted changes. These particularly include clear and up to date national policy covering the whole range of infrastructure development, a streamlined approach to local authority plan-making, a more flexible approach to town centre uses, a better way of approving major housing schemes, and a modernised form of development corporation that is locally-led and accountable. These important changes would restore market confidence and public faith in the planning system over the next year, helping the country to rebuild itself quickly and sustainably and facilitating the timing highlighted in No. 10's ambitiously-titled 'Project Speed'," he said.
The £5bn investment promised by the government includes £1.5bn for hospital maintenance and building and improving mental health facilities and A&E capacity; £100 million for 29 road projects across England; £10m for rail development work in the Manchester area; and £1bn to fund the first 50 projects of a new, ten-year school rebuilding programme, to be confirmed in the autumn. The pledges also include £900m towards 'shovel ready' local growth projects in England over the next two years, and £96m to accelerate investment in the town centres and high streets of locations selected for 'town deals'.
The government will also work with the devolved administrations to accelerate infrastructure projects in Scotland, Wales and Northern Ireland. It will publish a National Infrastructure Strategy in the autumn as planned, setting out its longer term planning for core economic infrastructure including energy networks, road and rail, flood defences and waste.
Infrastructure law expert Jon Hart of Pinsent Masons said: "These are big commitments with, on the face of it, some eye-catching procurement opportunities".
"There simply aren't enough 'shovel ready' projects out there, and it remains to be seen what this announcement will mean in practice," he said.