New rules governing the conduct of contractors bidding for government building and infrastructure work in Queensland and New South Wales will help insulate taxpayers from cost blowouts on public sector construction projects, governments of the two states say.

Having come into force on July 1, the Queensland Code of Practice for the Building and Construction Industry and the New South Wales Code of Practice for Procurement: Building and Construction set out practices expected of contractors bidding for public sector work in their respective states in areas of tendering…