For the purposes of section 13(1)(a) of the Act, the following classes of cost plus contracts are allowed—
(a) contracts for work entered into before 1 August 2017 that it is reasonably estimated will cost $500 000 or more;
(b) contracts for work entered into on or after 1 August 2017 that it is reasonably estimated will cost $1 000 000 or more;
(c) domestic building contracts for public construction where the Crown or a public entity is a party to the contract.