The Home Building Contracts Act defines a variation and sets out whjat must be done by both parties:
7.
(1) A variation of a contract
(a) must be in writing-
(i) setting out all of the terms of, and the cost of, the
variation;
(ii) showing the date of the variation;
and
(b) must be signed by the builder and the owner or their
respective agents.
(2) The owner or his agent must be given a copy of the signed
variation
(a) as soon as is reasonably practicable after it has been signed
by both parties; and
(b) before the work to which the variation relates is commenced.
The obligations must be met be both parties for the varioation to be considered binding. Fines apply to the builder for not following the protocol outlined withion the Home Building Contracts Act
