New South Wales Consolidated Regulations New South Wales Consolidated RegulationsA principal certifier for building work or subdivision work to be carried out on a site is required to be satisfied--
(a) before the work commences on the site--that a construction certificate or complying development certificate has been issued for such of the building work or subdivision work as requires development consent and over which the principal certifier has control, and
(b) before any residential building work over which the principal certifier has control commences on the site--that the principal contractor for the work is, if required by the Home Building Act 1989 , the holder of the appropriate licence and is covered by the appropriate insurance (unless the work is to be carried out by an owner-builder), and
(c) before an owner-builder commences on the site any residential building work over which the principal certifier has control--that the owner-builder is the holder of any owner-builder permit required under the Home Building Act 1989 , and
(d) before the principal certifier issues an occupation certificate or subdivision certificate for the building or work--that building work or subdivision work on the site has been inspected by the principal certifier or another certifier on such occasions as are required by this Regulation and on such other occasions as may be required by the principal certifier, and
(e) before the principal certifier issues an occupation certificate or subdivision certificate for the work--that any preconditions required by a development consent or complying development certificate to be met for the work before the issue of the occupation certificate or subdivision certificate have been met.