Construction Defect Risk in Australia: DBP Act, Professional Indemnity, and Decennial Liability Insurance
Australia’s construction and apartment sectors have faced sustained scrutiny after high-profile building defect cases, concerns about combustible cladding, and growing attention to who should bear the cost of serious construction failures.
In New South Wales, these concerns helped drive major reforms, including the Design and Building Practitioners Act 2020, stronger practitioner accountability, and continuing policy work around Decennial Liability Insurance (DLI) for apartment buildings.
This guide explains how construction defect risk, statutory duty of care, professional indemnity insurance, and DLI fit together in the Australian market.
Editorial note: This article is for general educational purposes only and does not provide legal, insurance, construction, or financial advice. Construction law, professional indemnity requirements, defect liability, and decennial insurance rules can vary by state, profession, project type, and policy wording. Readers should review current government guidance and seek qualified professional advice where needed.
1. Why Construction Defect Risk Became a Major Policy Issue
Public concern about apartment quality increased after major defect cases, including structural issues, cladding concerns, waterproofing failures, and disputes over who should fund remediation years after construction.
These issues highlighted recurring questions:
- Who is responsible when serious defects emerge after completion?
- Can owners recover economic loss when a defect affects building value or requires remediation?
- Are developers, builders, designers, engineers, and certifiers sufficiently accountable?
- Does existing insurance respond clearly enough to long-tail construction defect claims?
In NSW, the policy response has included stronger duties for practitioners, more formal design declarations, and a push for insurance structures that better protect apartment owners from serious latent defects.
Construction defect risk is no longer only a technical building issue. It is also a legal, insurance, financing, and consumer protection issue.
2. What the NSW Design and Building Practitioners Act Changed
The Design and Building Practitioners Act 2020 (NSW) introduced significant reforms for regulated building work. Among other things, it created a statutory duty of care requiring certain persons carrying out construction work to exercise reasonable care to avoid economic loss caused by defects.
The duty of care can apply to current and future owners of the relevant land or building, and it has retrospective effect within the limits set by the legislation and broader limitation rules.
For practitioners, the practical effect is that responsibility for serious defect-related economic loss can extend beyond the immediate contractual chain.
Who May Be Affected?
The duty of care may be relevant to persons involved in construction work, including those undertaking building work, design work, or other activities captured by the Act.
Depending on the facts, this may involve:
- builders,
- design practitioners,
- engineers,
- project consultants, and
- others whose work falls within the statutory framework.
The exact application depends on the role performed and how the Act defines the relevant construction work.
3. What “Duty of Care” Means in Practice
A statutory duty of care does not mean every defect automatically creates liability. The issue is whether the relevant person failed to exercise reasonable care and that failure caused economic loss linked to a defect.
Examples of disputes may involve:
- structural design issues,
- waterproofing defects,
- fire-safety defects,
- non-compliant design or construction work, and
- other building defects that cause loss to owners.
For insurers and practitioners, the important point is that defect claims may now be examined through both contractual and statutory pathways.
Practitioners should understand how the statutory duty of care interacts with their contracts, registration obligations, document retention, and professional indemnity arrangements.
4. Retrospective Effect: Why Old Projects Still Matter
The NSW statutory duty of care has retrospective operation for certain construction work completed before the legislation commenced, subject to the legal limits that apply. This is one reason older projects remain relevant when insurers assess exposure and when practitioners review historical files.
For construction professionals, this can create practical questions such as:
- How far back should project records be retained?
- Do prior projects involve residential or mixed-use building work now being scrutinised?
- Have legacy risks been disclosed accurately during insurance renewal?
- Do existing policies respond to claims arising from earlier work?
Because professional indemnity policies are commonly written on a claims-made basis, the policy in force when a claim is made can be highly important.
5. Professional Indemnity Insurance for Construction Practitioners
Professional indemnity insurance may help respond to claims alleging negligent professional services, design failures, certification issues, or other covered professional errors. It is especially important for architects, engineers, design practitioners, and certain building professionals.
NSW guidance states that registered design practitioners and professional engineers must have professional indemnity insurance. Separate rules and exemptions may apply to other practitioner groups, so businesses should review current official guidance carefully.
Practitioners should examine:
- the insuring clause,
- covered professional services,
- retroactive date,
- claims-made reporting requirements,
- defence-cost treatment,
- exclusions for cladding, waterproofing, or non-conforming products, and
- aggregate limits and deductibles.
A professional indemnity policy should not be reviewed only by premium. For construction practitioners, exclusions, retroactive cover, and claims reporting rules can be just as important as the headline limit.
6. Cladding and Other Exclusions
Following the combustible cladding crisis, some insurers narrowed professional indemnity cover or introduced exclusions relating to cladding and other non-conforming building products. Queensland government material has acknowledged that insurance providers increased premiums and changed conditions, including cladding exemptions in some cases.
Practitioners should check whether their current policy contains exclusions or limitations related to:
- combustible cladding,
- non-conforming building products,
- waterproofing or water ingress,
- fire engineering exposures,
- high-rise residential work, or
- certain project types or developers.
These exclusions are not identical across the market. A policy review should be specific to the practitioner’s actual operations and the wording of the current policy.
7. Why Claims-Made Cover Requires Extra Attention
Many professional indemnity policies are written on a claims-made and notified basis. This means the policy that may respond is often the one in force when the claim is first made and notified, not necessarily the one in force when the original work was performed.
That makes the following issues particularly important:
- continuity of cover,
- retroactive dates,
- timely notification of circumstances,
- policy cancellation risk, and
- whether an exclusion added at renewal affects older work.
Construction businesses with long-tail defect exposure should not assume that prior projects remain protected without checking the current claims-made policy structure.
8. What Is Decennial Liability Insurance?
Decennial Liability Insurance (DLI) is a 10-year defect insurance structure being developed and implemented in NSW for apartment buildings. NSW government material describes it as insurance intended to cover serious defects in critical building elements for up to ten years after occupation.
The policy objective is to provide a first-resort pathway for owners corporations to address certain serious defects without having to rely solely on long-running litigation against builders, developers, or consultants.
Government materials describe DLI as addressing critical building elements such as:
- structure,
- waterproofing,
- fire safety systems, and
- other relevant defect categories defined in the scheme.
9. DLI in 2026: Where the Reform Stands
NSW has been moving DLI from policy design toward operational implementation. In February 2026, the NSW Government announced further legislative changes intended to bring the scheme closer to operation and clarify the scope of covered defects. Building Commission NSW also describes DLI as part of the state’s broader building reform agenda.
That means businesses should avoid describing DLI as a fully mature, universal market solution across Australia. It is a developing NSW-led reform area whose details continue to evolve.
DLI may become an important apartment-defect protection tool in NSW, but project participants should review the current scheme status, eligibility rules, and insurer availability before relying on it in transactions.
10. DLI vs. Professional Indemnity Insurance
| Feature | Professional Indemnity Insurance | Decennial Liability Insurance |
|---|---|---|
| Main Purpose | Protects professionals against certain covered claims alleging professional error | Provides first-resort defect cover for certain apartment building defects |
| Who Benefits | The insured professional or firm | Building owners or owners corporations, subject to the scheme |
| Claims Trigger | Claim made and notified during the policy period, subject to wording | Serious or relevant defects identified within the scheme period |
| Key Review Point | Exclusions, retroactive date, notification, limits | Eligibility, building type, defect scope, scheme operation |
The two forms of protection address different parts of the defect-risk problem and should not be treated as interchangeable.
11. Practical Questions for Developers and Construction Professionals
- Does the project fall within a NSW building reform framework that changes design or declaration obligations?
- Are duty-of-care exposures and document retention procedures understood?
- Does current professional indemnity cover match the actual work performed?
- Are cladding, waterproofing, or other exclusions present?
- What claims-made reporting obligations apply?
- Could DLI be relevant to this apartment project, and what is the current scheme status?
- Have legal, insurance, and financing teams reviewed the same risk assumptions?
12. Common Mistakes to Avoid
- assuming older projects are irrelevant to today’s liability review,
- treating professional indemnity insurance as a generic annual purchase,
- failing to read cladding or waterproofing exclusions carefully,
- ignoring the claims-made nature of PI cover,
- assuming DLI is already mandatory and fully operational across Australia,
- not documenting design, declarations, and compliance decisions, and
- separating insurance review from broader project governance.
Final Thoughts
Australia’s construction-defect landscape has changed materially, particularly in NSW. The DBP Act, duty-of-care reforms, professional indemnity insurance pressures, and the development of decennial liability insurance all reflect a stronger focus on building quality and owner protection.
For developers, builders, engineers, architects, and other construction professionals, the right response is not alarmism. It is disciplined risk management: understand the statutory obligations, maintain accurate project records, review professional indemnity wording carefully, and follow the development of DLI where it may affect future projects.
Construction risk cannot be reduced to one insurance policy or one legal reform. It needs coordinated attention across compliance, design, contracts, insurance, and governance.
To understand how defect issues affect the strata sector more directly, see our related guide on Australia Strata Insurance: Combustible Cladding and Defect Liabilities.
Disclaimer: This article is for general educational purposes only and does not constitute legal, insurance, construction, or financial advice. The NSW DBP Act, professional indemnity requirements, cladding-related exclusions, and decennial liability insurance reforms may change or apply differently by profession and project type. Readers should review current NSW legislation, Building Commission NSW guidance, and their own policy documents with qualified professionals.
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