Subcontractor licence requirements in NSW: how the contractor licence framework applies to subcontract work

There is no separate "subcontractor" licence

A common misconception is that NSW has a distinct "subcontractor licence" with different rules from a head contractor licence. There is no such thing. Subcontractors in NSW operate under the same contractor licence framework as head contractors. The licence categories (general building, specialist trades) are the same regardless of whether the licence holder is contracting directly with a homeowner or with a head contractor.

What changes between head contracting and subcontracting is the commercial relationship and where the statutory warranty exposure sits, not the licence requirement itself.

When a subcontractor needs a licence

The general rule under the Home Building Act 1989 (NSW) is that a contractor licence is required for residential building work where the contract price exceeds $5,000 incl GST and the work is "residential building work" as defined in the Act.

This rule applies to subcontractors as much as to head contractors. A subcontractor performing general building work valued at more than $5,000 on a residential project requires a contractor licence in the relevant category. The fact that the subcontract is with the head contractor rather than with the homeowner does not remove the licence requirement.

For specialist trades (electrical work, plumbing, drainage, gasfitting, refrigeration and air-conditioning) the licence requirement applies regardless of the contract value. There is no $5,000 threshold for specialist trade work in NSW. Anyone doing this work commercially needs the relevant trade licence.

Head contractor verification obligations

A licensed head contractor is responsible for the work performed on a project. Engaging a subcontractor for work that requires a licence means the subcontractor must hold the appropriate licence in the relevant category. The head contractor must verify the licence before engagement.

NSW Fair Trading maintains a public licence register where any licence number can be looked up. Checking the register before signing a subcontract is the simplest way for a head contractor to confirm that the subcontractor's licence is current, in the right category and not under suspension.

If a subcontractor turns out to be unlicensed for work that requires a licence, the head contractor remains responsible for the work and for any defects. The additional risk is that the work performed by the unlicensed subcontractor may attract enforcement action against both parties.

Statutory warranties and the head contractor and subcontractor relationship

Statutory warranties under section 18B of the Home Building Act run between the licensed contractor and the homeowner. In a head-contractor-with-subcontractors structure, the homeowner's only direct contractual relationship is with the head contractor. The statutory warranties therefore run from the head contractor.

Subcontractors owe contractual obligations to the head contractor under the subcontract. Those obligations include the quality of the work done, fitness for purpose and compliance with applicable laws. If the head contractor faces a statutory warranty claim from the homeowner, the head contractor can in turn claim against the subcontractor under the subcontract for the subcontractor's portion of the work.

This is one reason head contractors carefully document subcontractor performance: a defects claim from a homeowner is typically recovered down the chain to the subcontractor responsible.

HBCF and subcontractors

The Home Building Compensation Fund (HBCF) cover held by the head contractor covers subcontractors working on the same project for that head contractor. Subcontractors do not need their own HBCF eligibility for that work.

If a subcontractor takes on residential work as a head contractor in their own right (contracting directly with the homeowner) and the work is over $20,000 incl GST, they need their own HBCF eligibility and certificate of insurance for that contract. The same person can operate as a head contractor on one job and as a subcontractor on another; the HBCF requirement depends on the contractual relationship for each specific job.

Penalties for unlicensed work

Under the Home Building Act 1989, doing residential building work that requires a licence without holding one is an offence. The maximum penalty is $22,000 for an individual and $110,000 for a company. NSW Fair Trading enforces the licensing rules and can take action against both unlicensed subcontractors and the head contractors who engaged them.

An unlicensed contractor cannot recover the contract price for the work performed. This applies regardless of the quality of the work: the licensing requirement is a precondition to contractual enforcement of payment under the Home Building Act.

Practical implications

Three habits keep a head contractor on the right side of the licensing rules.

Verify every subcontractor's licence on the public register before engagement. Save the result. The check takes two minutes and provides a record that the head contractor exercised reasonable diligence.

Keep the licence category match in mind. A general building licence does not authorise specialist trade work. A specialist trade licence does not authorise general building work outside the trade.

Document the subcontract scope in writing. Where the subcontractor licence category does not cover the full scope, split the subcontract or engage an additional licensed party for the uncovered scope.

Related entries

Builder licence classes including the general and specialist categories are covered in the builder-licence-classes entry. Statutory warranties that head contractors owe to homeowners are in the statutory-warranties entry. HBCF cover for head contractors and the position of subcontractors under it are in the hbcf-insurance-requirements entry.