How Structural and Non-Structural Defects Are Classified in Western Australia

What it is

Western Australia is the only Australian jurisdiction that runs a single defect period across the board. There is no statutory major or structural defect definition, no two-tier warranty period, and no split between load-bearing and cosmetic defects in the primary legislation. What Western Australia has is a flat 4 month section 11 make-good window under the Home Building Contracts Act 1991 (WA) and a flat 6 year workmanship complaint window under the Building Services (Complaint Resolution and Administration) Act 2011 (WA).

The structural characterisation still matters, but it operates at the Building and Energy administrative layer rather than at the statutory limitation layer.

No statutory split at the primary layer

Section 11 of the HBCA implies a term that the builder is liable to make good any defect notified in writing within 4 months of the day of practical completion. A defect is defined in section 11(1) as a failure to perform the home building work in a proper and workmanlike manner and in accordance with the contract, or a failure to supply materials of merchantable quality and reasonably fit for purpose. The same period applies whether the defect is cosmetic, non-structural or structural.

Section 11(2) permits the contract to specify a longer period. TradeForm WA templates and most industry forms extend to 6 or 12 months on the face of the contract. That extension applies flat across defect types too.

The 6 year workmanship complaint window under BSCRA runs the same way. A building remedy order complaint must be lodged within 6 years of practical completion of the building work, regardless of whether the defect is structural or non-structural.

Where the structural characterisation still matters

Even without a statutory split, Building and Energy uses a structural versus non-structural distinction for order priority and for referral to specialist inspectors. Structural elements include foundations, footings, load-bearing walls, roof structure, floor structure and load-bearing components. A structural finding pulls a Building Commissioner order to the front of the queue and triggers an engineering inspection.

Non-structural findings run the standard inspection cycle without an engineering escalation. That does not change the 6 year statutory window, but it does change the practical rectification timeline.

HII cover triggers do not split by defect

Home Indemnity Insurance under the HBCA Regulations 1992 (WA) covers non-completion and defects up to $200,000. Cover triggers are the builder's death, disappearance, insolvency or registration cancelled or not renewed for financial reasons. The trigger and cover analysis does not turn on whether the defect is structural or non-structural. Once the trigger event occurs, HII responds to defects notified within 6 years of practical completion up to the cover cap.

That means the practical Western Australian analysis on defects is different from the eastern states in one respect: the structural characterisation does not change the warranty period or the insurance response, only the regulatory priority of a Building and Energy investigation.

Why the flat structure exists

The HBCA was drafted in 1991 around progress payments and price protections rather than around a comprehensive statutory warranty regime. Section 11 was included as a minimum make-good obligation, not as a defect classification framework. The 2011 BSCRA added the complaint pathway on top without introducing a statutory split.

The 2026 review of Western Australia's home building contract laws, consultation closed 24 June 2026 with recommendations due September 2026, has the statutory warranty content on the reform agenda. A structural or major defect definition would be a possible addition, though the review discussion paper did not commit to introducing one.

How WA compares

Every other state uses at least a two-tier period. NSW: 6 years for major and 2 years for other under section 18E of the HBA (with a statutory definition in section 18E(4)). Queensland: 6 years structural and 1 year other under section 29 of Schedule 1B of the QBCC Act. ACT: 6 years structural and 2 years non-structural under section 88 of the Building Act 2004 (ACT). NT: 6 years structural and 1 year non-structural under the Building Act 1993 (NT). South Australia: flat 5 years under section 32(5) of the BWCA. Victoria: 10 year long-stop under section 134 of the Building Act 1993 (Vic) with no split at the DBCA warranty layer.

Western Australia is closest to South Australia in taking a flat approach, but where South Australia sets the period at 5 years, Western Australia sits at 6 years for the workmanship route and 3 years for the HBCA contract route. That combination makes the WA analysis simpler on classification and harder on the shorter contract route.