7.—(1) Where the client is a domestic client the duties in regulations 4(1) to (7) and 6 must be carried out by—
(a)the contractor for a project where there is only one contractor;
(b)the principal contractor for a project where there is more than one contractor; or
(c)the principal designer where there is a written agreement that the principal designer will fulfil those duties.
(2) If a domestic client fails to make the appointments required by regulation 5—
(a)the designer in control of the pre-construction phase of the project is the principal designer;
(b)the contractor in control of the construction phase of the project is the principal contractor.
(3) Regulation 5(3) and (4) does not apply to a domestic client.