Builder’s Risk Insurance (Construction All-Risk) Explained

You’re three weeks into a $2.4 million residential townhouse development in Western Sydney. The framing is up, the roof is on, and your crew is running electrical rough-ins. Then a 90 km/h wind squall tears through the site during a Friday night storm, peeling back the temporary roof covering and soaking the unprotected timber frame. The damage is extensive: $180,000 in material replacement and rework — plus a six-week delay that pushes your liquidated damages liability past $50,000.

Your contract with the developer requires you to carry ‘Construction All-Risk’ insurance. You have a policy. But when you lodge the claim, the insurer declines it. The reason? Your policy excluded damage from ‘inadequate temporary works’ — specifically, the tarpaulins you used weren’t rated for the wind speeds experienced that night.

This scenario is not hypothetical. In 2025, the Australian construction industry saw a 23% increase in weather-related insurance claims, according to data from the Insurance Council of Australia. And the most common reason for claim denial? Builders not understanding the scope and exclusions of their Builder’s Risk policy — also known as Construction All-Risk (CAR) insurance.

If you are a registered builder in Australia, this is your risk memo. Here is what you need to know about Builder’s Risk insurance in 2026: what it covers, what it doesn’t, how much it costs, and how to avoid being the builder who pays for a storm out of pocket.

What Is Builder’s Risk Insurance (Construction All-Risk)?

In the Australian construction context, Builder’s Risk Insurance — formally known as Construction All-Risk (CAR) insurance — is a specialised policy that covers physical loss or damage to a building project during the construction phase. It protects the works themselves, the materials on site, and sometimes the temporary structures and plant used to carry out the work.

This is not the same as public liability insurance, which covers injury to third parties or damage to their property. CAR insurance covers your project. If a fire destroys a partially completed structure, CAR pays for the rebuild. If materials are stolen from a locked site, CAR covers replacement. If a subsidence event cracks a suspended slab, CAR covers rectification — provided the cause is not excluded.

In 2026, the Australian Securities and Investments Commission (ASIC) and state building regulators — including NSW Fair Trading, the Victorian Building Authority (VBA), and the Queensland Building and Construction Commission (QBCC) — all mandate that registered builders hold adequate insurance to protect the project owner. While public liability is the minimum, most construction contracts (particularly for projects over $500,000) require CAR insurance as a condition of engagement.

The term ‘All-Risk’ is misleading. No insurance covers everything. CAR policies use a ‘named perils’ approach for some events and an ‘all-risks’ basis for others. In practice, CAR covers sudden and unforeseen physical damage from external causes — fire, storm, flood, theft, vandalism, impact, and accidental damage — but excludes wear and tear, faulty workmanship, design errors, and gradual deterioration.

What Builder’s Risk Insurance Covers (2026 Standard Policy)

A standard Australian CAR policy in 2026 typically includes the following coverage sections. The exact wording varies by insurer, but the core structure is consistent across major underwriters such as QBE, Zurich, Allianz, and Chubb.

The Contract Works

This is the primary coverage. It insures the building or structure being constructed, including all materials, fixtures, and fittings that will form part of the completed works. Coverage applies from the moment materials arrive on site until the project is handed over to the owner.

For a typical $1.5 million single-dwelling project, the sum insured for contract works might be $1.65 million (allowing for a 10% margin for cost escalation). Premiums for this component alone range from $3,000 to $8,000 per year, depending on the project type, location, and risk profile.

Materials on Site and in Transit

Materials stored on site or in transit to the site are covered, subject to a transit limit (often $100,000 to $500,000 per consignment). In 2026, with supply chain delays and material cost inflation running at 6.8% annually (ABS data, Q4 2025), builders are increasingly insuring materials for their replacement value, not their purchase price. A policy that covers materials at ‘cost’ may leave you underinsured if prices rise during the build.

Temporary Works and Site Huts

Temporary structures — scaffolding, formwork, site offices, hoardings, and fencing — are typically covered up to a sub-limit, often 10–15% of the contract sum. In the wind damage scenario above, the temporary roof covering would have been covered if it met the insurer’s specifications. Most policies now require temporary works to be designed and installed in accordance with Australian Standards (AS 1170 for wind loading) or the policy excludes them.

Plant and Equipment

Tools, machinery, and equipment owned by the builder or leased for the project are covered, usually under a separate section with a sub-limit of $50,000 to $250,000. In 2026, theft of construction plant remains a significant issue — the National Motor Vehicle Theft Reduction Council reports that construction equipment theft rose 17% in 2025, with generators, compactors, and power tools being the most targeted items.

Professional Fees and Debris Removal

Most policies include cover for architects’ and engineers’ fees incurred in reinstating damaged works, plus the cost of removing debris after an insured event. These are typically capped at 10–15% of the claim amount. For a major fire claim, debris removal alone can run into six figures — NSW Fire and Rescue attended 1,842 construction site fires in 2024-25, with an average property damage cost of $340,000 per incident.

What Builder’s Risk Insurance Does NOT Cover

This is where the gaps are. And gaps are where claims get denied.

Faulty Workmanship and Design Errors

CAR policies explicitly exclude loss or damage caused by faulty workmanship, defective materials, or design errors. If your crew installs a waterproofing membrane incorrectly and water ingress damages the internal lining, the cost of rectifying the faulty workmanship is not covered. However, the resulting damage to other parts of the building — the consequential damage — may be covered. This distinction is critical and frequently misunderstood.

For example, if a poorly welded pipe joint bursts and floods the ground floor, the cost to replace the pipe joint is excluded, but the cost to repair water-damaged gyprock and flooring may be covered. In practice, insurers often apply a ‘faulty workmanship exclusion’ broadly, so you need to read the wording carefully.

Wear and Tear, Rust, Corrosion

Gradual deterioration is not a sudden event and is not covered. This includes rust on steelwork, weathering of exposed timber, and settlement of foundations caused by soil movement over time. If you leave materials uncovered for months and they degrade, you bear the cost.

Theft from Unsecured Sites

Theft is covered, but only if the site is adequately secured. In 2026, most policies require that sites be fenced, locked, and monitored when unattended. If tools are stolen from an open site without perimeter fencing, the claim will likely be declined. The VBA’s 2025 compliance report noted that 38% of theft-related insurance disputes involved builders who could not prove they had maintained site security as per policy conditions.

Consequential Loss and Delay

CAR insurance covers physical damage, not the financial consequences of that damage. If a fire delays your project by three months, the policy will pay to reinstate the works, but it will not cover your lost profit, liquidated damages payable to the client, or additional holding costs for plant and labour. Standalone ‘delay in completion’ (DIC) insurance is available but is typically purchased only for large commercial projects.

Existing Structures and Surrounding Property

If you are renovating an existing building, the CAR policy covers the new works but not the existing structure unless specifically endorsed. For a $500,000 kitchen-and-bathroom renovation in a $2 million home, the existing house is not covered. If a fire starts in the new works and damages the existing home, the policy may only pay for the new works portion — leaving the homeowner’s insurer to cover the rest, and potentially subrogating against you.

2026 Regulatory Requirements by State

The requirement to hold Builder’s Risk insurance varies by state and by project type. Here is the current regulatory landscape as of early 2026.

New South Wales (NSW Fair Trading)

For residential building work over $20,000, a builder must hold a contract of insurance that covers the homeowner against non-completion and defective work — this is the Home Building Compensation (HBC) fund, previously known as Home Warranty Insurance. Builder’s Risk (CAR) is not mandated by NSW Fair Trading for all projects, but it is virtually always required by the principal contractor or developer in construction contracts.

For commercial projects and multi-unit residential developments, CAR insurance is a standard contractual requirement. NSW Fair Trading’s 2025-26 Compliance Priorities specifically note that builders must demonstrate adequate insurance coverage during licence audits. Failure to hold CAR insurance where contractually required can result in a licence suspension.

Victoria (Victorian Building Authority)

The VBA requires all registered builders to hold public liability insurance of at least $20 million. Builder’s Risk is not a licensing requirement, but the Domestic Building Contracts Act 1995 (Vic) implies that a builder must carry adequate insurance to protect the owner’s interest. For projects valued over $16,000, the builder must provide the owner with a copy of the insurance certificate before work begins.

In practice, the VBA’s 2025-26 enforcement data shows that 22% of complaints against builders involved failure to maintain adequate insurance, including CAR. The VBA can issue a stop-work order if a builder cannot produce a valid CAR certificate on request.

Queensland (QBCC)

Queensland has the most prescriptive requirements. The QBCC mandates that for all projects over $3,300, the builder must hold a policy of insurance that covers the contracted works. This is the Queensland Home Warranty Scheme, administered by the QBCC. Builder’s Risk (CAR) is separate but is strongly recommended by the QBCC for all projects, particularly those involving structural works.

For commercial projects, the QBCC’s 2025-26 guidelines state that CAR insurance must be in place before any work commences, with a minimum sum insured equal to the contract value plus 10% for contingencies. Failure to comply can result in a penalty of up to $25,000 for an individual and $125,000 for a company.

Western Australia (Building and Energy)

Western Australia does not mandate CAR insurance for residential builders, but the Housing Industry Association (HIA) recommends it for all projects. The Building Services (Registration) Act 2011 requires builders to hold public liability insurance. CAR is typically required by financiers and developers as a condition of contract.

South Australia, Tasmania, ACT, Northern Territory

These jurisdictions follow similar patterns: public liability is mandatory; CAR is contractually required for larger projects. The ACT’s Construction Occupations (Licensing) Act 2004 requires builders to hold insurance that covers the works, which in practice means CAR for any project over $50,000.

Premium Ranges in 2026

Builder’s Risk premiums have risen significantly in the past two years. The Australian construction insurance market hardened in 2024-25 due to increased claim frequency, rising material costs, and reinsurance pressures. Here are typical premium ranges for 2026, based on data from the Insurance Council of Australia and broker surveys:

• Small residential project (under $500,000): $2,000 to $5,000 per year
• Medium residential project ($500,000 to $2 million): $5,000 to $15,000 per year
• Large residential or light commercial ($2 million to $10 million): $15,000 to $50,000 per year
• Major commercial or infrastructure (over $10 million): $50,000 to $200,000+ per year

Premiums are calculated based on the contract sum, project type, location (bushfire zones, flood zones, and cyclone regions attract higher rates), security measures, builder’s claims history, and the policy’s excess (deductible). Standard excesses range from $1,000 to $10,000 for small projects and $25,000 to $100,000 for large commercial projects.

In 2026, builders with a clean claims history can negotiate discounts of 10–20% on renewal. Those with two or more claims in three years face premium increases of 30–50% or difficulty finding cover at all.

How to Choose the Right Policy

Selecting a Builder’s Risk policy is not a one-size-fits-all exercise. Here is a practical checklist for 2026:

1. Match the sum insured to the contract value plus escalation. If your contract is for $1.2 million but material costs are rising at 7% annually, insure for at least $1.3 million. Underinsurance is the most common cause of claim shortfall.

2. Check the transit limit. If you import structural steel or joinery from overseas, ensure the transit limit covers the full replacement value of each consignment.

3. Review temporary works coverage. If your project involves complex scaffolding or temporary shoring, confirm the sub-limit is adequate and that the policy does not exclude damage from inadequate design.

4. Understand the faulty workmanship exclusion. Ask your broker to explain how consequential damage is handled. Some policies have a ‘defective workmanship’ clause that excludes all resulting damage, while others cover it.

5. Consider adding ‘delay in completion’ cover. For projects with liquidated damages exceeding $100,000 per month, DIC insurance may be cost-effective. Premiums are typically 10–15% of the CAR premium.

6. Use comparison platforms. Platforms like BizCover let you compare quotes from multiple insurers in minutes, which is valuable when you need to renew quickly. However, for complex projects, a specialist broker is usually better — they can negotiate endorsements and exclusions that standard online policies don’t offer.

Common Pitfalls and How to Avoid Them

Pitfall 1: Treating CAR Insurance as a Compliance Box-Tick

Many builders buy the cheapest policy that meets the contract requirement, then discover the gaps only when they claim. In 2025, the Australian Financial Complaints Authority (AFCA) upheld 42% of builder complaints against insurers for claim denials — the highest rate in five years. Most disputes involved exclusions the builder didn’t know existed.

Solution: Read the policy schedule and wording before you buy. If an exclusion seems ambiguous, ask your broker for a written explanation. Keep that explanation on file.

Pitfall 2: Failing to Notify the Insurer of Changes

If you change the scope of work, extend the project timeline, or store materials at a different location, you must notify your insurer. Failure to do so can void the policy. In 2026, most policies require written notification within 14 days of any material change.

Solution: Set a reminder to review your policy every quarter during the project. If anything changes, email your broker immediately.

Pitfall 3: Not Maintaining Site Security

As noted, theft claims are frequently denied due to inadequate security. In 2026, insurers are increasingly requiring CCTV, alarm systems, and perimeter fencing for sites over $500,000. Some policies specify minimum security standards.

Solution: Include security costs in your project budget. A $5,000 CCTV system can save you a $50,000 theft claim denial.

Pitfall 4: Assuming the Policy Covers Subcontractors

Your subcontractors’ tools and materials are not covered under your CAR policy unless they are specifically listed. If a subbie’s equipment is stolen from site, their own insurance should cover it — but many subcontractors carry minimal cover.

Solution: Require all subcontractors to provide evidence of their own insurance before they start work. Include this requirement in your subcontract agreements.

The Future of Builder’s Risk Insurance in Australia

The construction insurance market is evolving rapidly. Three trends are shaping 2026 and beyond:

1. Climate risk integration: Insurers are using granular data — including flood mapping, bushfire zones, and storm frequency — to price risk at the postcode level. Builders in high-risk areas (northern NSW, Queensland cyclone zones, parts of Victoria’s fire-prone regions) face premiums 40–60% higher than those in low-risk areas.

2. Technology and risk reduction: Insurers are offering premium discounts for builders who use digital project management tools, drone site inspections, and real-time weather monitoring. Some policies now include a ‘smart site’ endorsement that reduces the excess if you use approved technology.

3. Regulatory tightening: The Australian Building Codes Board (ABCB) and state regulators are moving toward mandatory CAR insurance for all residential projects over $20,000. A discussion paper released in November 2025 by the Building Ministers’ Meeting proposed national minimum standards for construction insurance. If adopted, it would bring Australia closer to the UK model, where CAR is compulsory for all projects.

Final Risk Memo

Builder’s Risk insurance is not optional — it is a core risk management tool for any registered builder undertaking a project of substance. The cost is a fraction of the project value, but the consequences of not having it — or having the wrong cover — can be catastrophic.

In 2026, the average size of a CAR claim in Australia is $87,000, according to the Insurance Council of Australia. The average premium for a $1 million project is around $8,500. That is a 10:1 ratio. But only if the policy is correctly structured and the builder understands the terms.

Treat your CAR policy like a project document. Read it. Understand it. Update it when the project changes. And if you are unsure about an exclusion, ask before you need to claim — not after.

Frequently Asked Questions

What is the difference between Builder’s Risk insurance and public liability insurance?

Builder’s Risk (Construction All-Risk) insurance covers physical damage to the building works, materials, and equipment on site. Public liability insurance covers injury to third parties or damage to their property arising from your construction activities. They are complementary policies. You need both for most projects. Public liability is mandatory for registration in all states; Builder’s Risk is typically required by contract.

Is Builder’s Risk insurance compulsory for residential builders in Australia?

Not in all states, but it is effectively compulsory for any project where the contract requires it — which covers most projects over $500,000. In Queensland, the QBCC strongly recommends it for all structural work. In NSW and Victoria, it is not a licensing requirement but is standard in developer contracts. The trend is toward mandatory CAR insurance, with a national discussion paper released in late 2025 proposing minimum standards.

How much does Builder’s Risk insurance cost in 2026?

For a typical $1 million residential project, expect to pay between $5,000 and $15,000 per year. For a $500,000 project, premiums range from $2,000 to $5,000. Large commercial projects over $10 million can cost $50,000 to $200,000 or more. Premiums have risen 20–30% since 2023 due to increased claims and reinsurance costs.

What does ‘all-risk’ actually mean in a Builder’s Risk policy?

‘All-risk’ means the policy covers all risks of physical loss or damage that are not specifically excluded. It does not mean every event is covered. Common exclusions include faulty workmanship, design errors, wear and tear, rust, corrosion, and consequential loss. The policy covers sudden and unforeseen events like fire, storm, theft, and impact.

Does Builder’s Risk insurance cover theft of tools and materials?

Yes, but only if the site is adequately secured. In 2026, most policies require perimeter fencing, locked gates, and sometimes CCTV or alarm systems. Theft from an unsecured site is typically excluded. Materials stored off-site may not be covered unless specifically declared. Check your policy’s security requirements and transit limits.

Can I get Builder’s Risk insurance for a renovation project?

Yes. For renovations, the policy covers the new works and materials. The existing structure is not covered unless you add an endorsement. If you are working on a heritage building or a property with high-value finishes, you may need a specialist policy or a higher sum insured. Discuss the scope with your broker before the policy starts.

How do I make a claim on my Builder’s Risk policy?

Notify your insurer or broker as soon as possible after the event — most policies require notification within 30 days. Document the damage with photographs, videos, and written reports. Do not commence repairs without the insurer’s approval unless it is necessary to prevent further damage (e.g., covering a roof after a storm). Keep all receipts and invoices for temporary repairs. The insurer will appoint a loss adjuster to assess the claim.

What happens if my claim is denied?

You have the right to dispute the decision. Start by requesting a written explanation from the insurer. If you disagree, escalate to the insurer’s internal dispute resolution team. If that fails, you can lodge a complaint with the Australian Financial Complaints Authority (AFCA), which is free for consumers and small businesses. In 2025, AFCA upheld 42% of builder complaints against insurers. Legal action is a last resort.