KeNHA will wait for MPs to pass laws that will allow the erection of toll stations.
Cement consumption was 4% higher in the first half of 2012 than a year earlier.
The contractors claim they have been locked out of lucrative contracts.
The public has been asked to air their views on the draft laws.
The strategic plan targets to build more than 1,000 kilometres of new roads.
The event is organised twice a year by Unique Homes Magazine.
The sector grew by 6.4pc in 2019, down from 6.9pc in 2018.
Kenya ranked highest among East African countries followed by Ethiopia and Tanzania.
Kenya is attractive for steel dealers because of its ongoing mega projects
New laws will open up high-end estates west of Nairobi to commercial property developers.
Bedsitters will rent for Sh3,200 per month on a 30-year rent-to-own plan.
Yapı Merkezi is expected to complete the 272-kilometre railway in 48 months.
The new flyover, funded by Spain, is expected to open in 2027.