Are they legally binding

Codes of practice are admissible in court proceedings under the Work Health and Safety Act 2012 and the Work Health and Safety Regulations 2012.

Courts may regard a code of practice as evidence of what is known about a hazard, risk or control, and rely on it to determine what is 'reasonably practicable' in the circumstances to which the code relates.

It is recognised that equivalent or better ways of achieving the required work health and safety outcomes may be possible. For that reason compliance with codes of practice is not mandatory providing that any other method used provides an equivalent or higher standard of work health and safety than suggested by the code of practice.

Further, an inspector can refer to a code of practice when issuing an improvement or prohibition notice.

Safe Work Australia has guidance material that can also help you achieve the standards under work health and safety laws.