This Act does not apply to, or in relation to, residential building work that –

(a) is performed, or is to be performed, for a contract price that is less than $20 000 or another greater amount, if any, that is prescribed by the regulations; or

(b) is begun before the commencement of this Act, or performed, in pursuance of a residential building work contract entered into before the commencement of this Act; or

(c) consists solely of demolition work; or

(d) is exempted from this Act in accordance with section 10 .