(1) Where under an agreement the owner or seller is required to carry out any installation, the consumer shall be notified of the amount to be paid in respect of the installation but such amount shall not be treated for the purposes of this Act as part of the purchase price.
(2) For the purposes of this section “installation” means—
(a) the installing of an electric supply line or a water line;
(b) the fixing of goods to which the agreement relates to the premises where they are to be used and the alteration of premises to enable any such goods to be used;
(c) where it is reasonably necessary that any such goods should be constructed or erected on the premises where they are to be used, any work carried out for the purpose of such construction or erection.