Increasing the solatium would help speed up projects of national significance, he said.
A new solatium payment for land loss, in which the land acquired for a public work did not contain the landowner's home, would also be also introduced, Mr Williamson said.
"While there's currently no solatium under the Act for such situations, these landowners are still subject to disruption and other forms of inconvenience when their land is acquired for a public work."
The payment will be fixed at 10 per cent of the value of the land acquired - from a minimum $250 to a maximum $25,000, Mr Williamson said.
The Land Information Minister may also delegate powers to allow the chief executive of Land Information New Zealand to issue the notice of desire to acquire land, which will reduce the acquisition process by about two weeks.
The changes will be progressed alongside changes to the Resource Management Act and will reduce time and cost for land owners and acquiring authorities, Mr Williamson said.