When You Need a Builder Registration in Western Australia

What it is

Western Australia licenses builders under the Building Services (Registration) Act 2011 (WA) and administers the framework through the Building and Energy division of the Department of Local Government, Industry Regulation and Safety (LGIRS). Registration is required to carry out or contract for building services work at or above the prescribed threshold.

The Home Building Contracts Act 1991 (WA) runs the contract-specific rules for residential building work over $7,500 (the HBCA-applies threshold) and the compulsory Home Indemnity Insurance framework for work over $20,000. Registration under the Building Services (Registration) Act 2011 attaches at the $20,000 permit-work threshold.

The $20,000 threshold

Section 25C of the HBCA and the WA registration framework require builder registration for residential building work valued at $20,000 or more that requires a building permit. Below $20,000 an unregistered person can carry out home building work, subject to the general prohibition on unregistered practice for regulated building services.

That is different from most states, which set a lower threshold for licensing. QLD requires a licence at $3,300; NSW at $5,000; VIC at $10,000 for the major contract registration trigger; ACT at $12,000. WA's $20,000 threshold gives a broader unregistered space for small residential work.

Registration classes

The Building Services (Registration) Act 2011 (WA) prescribes registration classes for building service providers:

• registered builder (individual)
• registered builder (contractor) - the company or partnership vehicle
• builder practitioner
• building surveyor
• building surveying practitioner
• painter (contractor and practitioner)

The distinction between individual builder registration and contractor registration matters for company builders. A company holds contractor registration; the nominated supervisor holds individual builder registration and is responsible for the work.

Building and Energy administers

Building and Energy took over the building regulator role on 1 July 2025 from the former DEMIRS structure. Registration applications, renewals, disciplinary matters and the Nominated Supervisor framework all run through Building and Energy under the LGIRS umbrella.

Do not cite DEMIRS in 2026 drafting; it ceased on 1 July 2025.

The Nominated Supervisor framework

A company builder must have at least one Nominated Supervisor who holds individual builder registration in the appropriate class. The Nominated Supervisor is responsible for the technical work and carries personal liability for compliance breaches.

Losing the Nominated Supervisor without a replacement can suspend the company's operational capacity. TradeForm WA templates flag the Nominated Supervisor obligation prominently for company-side operations.

Owner-builder registration

Owner-builder work in Western Australia is covered by a separate approval framework rather than a general licence exemption. An owner intending to build or renovate their own home must obtain an owner-builder approval before the local government building permit issues.

Owner-builder approvals attach conditions similar to other states: no sale within 7 years without cover (section 25F of the HBCA), no on-selling of the work as a licensed service, and personal responsibility for all defects.

HBCA scope

The Home Building Contracts Act 1991 (WA) applies to home building work between $7,500 and $500,000 (section 3). Below $7,500 the HBCA contract-formalities regime does not apply, and above $500,000 the contract is outside the residential regime.

Registration under the Building Services (Registration) Act attaches at the $20,000 permit-work threshold, so there is a $7,500 to $20,000 band where HBCA contract rules apply but formal registration is not required for the builder.

Consequences of unregistered work

Section 3 of the Building Services (Registration) Act 2011 makes it an offence for a person to provide a regulated building service without registration. Contract enforceability is affected under general law principles: an unregistered contractor may face difficulties enforcing the contract, though the position is not as tightly framed as section 10 of the NSW HBA.

The 2026 review

The 2026 review of Western Australia's home building contract laws (consultation closed 24 June 2026, recommendations due September 2026) is examining licensing settings among other topics. The Building Services Legislation Amendment (Financial Oversight) Bill 2026 was introduced in May 2026 and may change financial oversight of registered builders.

How Western Australia compares

WA's $20,000 threshold is the highest single licensing threshold in Australia. Most states trigger licensing at $3,300 (QLD), $5,000 (NSW) or $10,000 (VIC). WA leaves a wider unregistered space for small residential work but still applies the HBCA contract regime and the compulsory HII insurance regime independently.