You must have a contractor licence or employ the holder of a qualified supervisor certificate to contract, subcontract or advertise to do:

• residential building work where the labour and materials content is more than $1,000
• electrical wiring work
• plumbing, draining and gas fitting work
• air conditioning and refrigeration work (except plug-in appliances)
• building consultancy work to carry out pre-purchase property inspections.

Where the contract price for the building materials exceeds $1,000, a licence is also needed to supply:

• kit homes
• garages
• carports 
• sheds.

Caution. By law, your licence number must be shown on all advertising, stationery and signage.

If you work without the proper licence, you are breaking the law and you will be unable to enforce a contract for the work against the other party.

This section provides the following information on licensing:

Applying for or renewing a licence or certificate
Cancelled or suspended building licences
Licence classes
Interstate licences