A building certifier, also known as a building surveyor, is needed to ensure that building plans and work is completed in accordance with the building legislation and the Building Code of Australia. The Code covers issues such as structural safety, and health and fire protection, but does not address quality of the work or finish.

A plumbing plan certifier is needed to ensure the plumbing and drainage plans comply with the standards required before the work is completed. This applies to work with a value of over $1000.