An assigned certifier (a professional such as a chartered engineer, building surveyor or registered architect), will be appointed by the owner, using the statutory form of appointment in the Regulations called a notice of assignment of an assigned certifier. The assigned certifier will inspect and certify the works.

The assigned certifier signs the certificate of compliance agreeing to carry out their inspection activities in accordance with the Regulations. They will inspect and certify the building works at key stages during construction and, in practice the assigned certifier will be monitoring the works.