Contract Works Insurance in Australia: A Guide for $20M+ Contractors

Contract works insurance is the policy that sits under almost every construction and mining project of scale in Australia — covering the works themselves while they are being built. For established Australian construction and mining companies turning over $20M+, it is rarely the most expensive cover in the program, but it is one of the most contractually scrutinised: principals write it into the contract, and a tender cannot proceed without it.

This guide sits within BCS Broking's broader commercial insurance for Australian construction and mining coverage. It explains what contract works insurance covers, how the sum insured is set, the exclusions that cause the most argument, and how the cover maps to standard Australian contracts such as AS4000. A note on roles throughout: the cover is provided by APRA-regulated underwriters, and a broker structures the policy and aligns it to the contract. BCS Broking acts as the broker — it does not carry the risk.

What is contract works insurance?

Contract works insurance — also called construction works insurance, contractor's all risks (CAR) or, for installation-heavy projects, erection all risks (EAR) — is a project-based policy that responds to physical loss or damage to the works during the construction period. It is a "named perils excluded" or "all risks" form: it covers sudden and accidental physical loss or damage from any cause that is not specifically excluded.

The cover runs from the start of works (or the first delivery of materials to site) through to practical completion or handover, and typically extends into a defects liability or maintenance period afterwards. On a project basis it can be arranged for a single project, or, for a contractor running multiple jobs, under an annual policy that picks up qualifying projects automatically.

For a $20M+ operator, the practical value is twofold. It protects the contractor's exposure to rebuilding damaged works at its own cost, and it satisfies the insurance obligations written into the construction contract — which is often what gets the project across the line at financial close.

What does contract works insurance cover?

Contract works is a first-party material damage cover: it responds to physical loss or damage to the works themselves during construction. It does not provide third-party liability cover — public liability is arranged separately, usually on the contractor's annual policy. Most disputes about scope come down to whether the sum insured was set correctly.

The material damage cover responds to loss or damage to:

Beyond the core material damage cover, a contract works policy is usually extended to reflect how the project actually runs. Common extensions include:

• Escalation and variations — additional value from cost rises and scope changes during the build
• Removal of debris — the cost of clearing a damaged site before reinstatement can begin
• Professional fees — architects', engineers' and surveyors' costs to redesign and supervise the reinstatement
• Existing structures / surrounding property — damage to property the contractor is working on or adjacent to, particularly on brownfield and refurbishment work
• Principal-supplied materials — materials free-issued by the principal that the contract makes the contractor responsible for
• Maintenance / defects liability cover — damage occurring, or discovered, during the defects period after completion

Contractor's all risks vs construction works insurance — what's the difference?

In the Australian market the terms are largely interchangeable. "Contract works", "construction works" and "contractor's all risks" all describe the same family of project cover — physical damage to the works during construction. "Erection all risks" is the label more often used where the project is dominated by plant installation and commissioning rather than civil or building work, but the policy form is closely related.

The label on the quote slip matters far less than three things: what the policy wording actually covers, how the sum insured is set, and which exclusions and conditions apply. Two policies both called "contract works" can differ materially on defective workmanship treatment, the maintenance period, and how variations are picked up. For $20M+ contractors, comparing wordings — not titles — is what protects the position.

How is the sum insured set?

The sum insured under the material damage cover is the figure most often set wrong, and under-declaration is the most common cause of a contract works claim being reduced. The starting point is the full contract value, but the correct sum insured is usually higher than the headline contract price.

The components that typically make up an adequate sum insured are:

1. Full contract value — the complete cost of the permanent and temporary works
2. Escalation and variations — an allowance for cost increases and scope changes over the construction period
3. Removal of debris — the cost of clearing the site after a major loss before rebuilding
4. Professional fees — design and supervision costs to reinstate the works
5. Principal-supplied materials — the value of any free-issued materials the contract makes the contractor responsible for

Where the declared sum insured falls short of the actual value at risk, average (co-insurance) can apply: the insurer reduces the claim payment in proportion to the under-declaration. On a project running into the hundreds of millions, even a modest percentage shortfall can translate into a seven-figure gap that the contractor wears. This is why the sum insured is reviewed against the latest contract value, not the value at tender — and why annual policies carry declaration conditions that have to be met.

What does contract works insurance exclude?

A contract works policy is broad, but it is not unlimited. The exclusions that cause the most argument on Australian projects are those around defects — the line between damage the policy pays for and rectification the contractor was always going to have to fund.

Defective design, materials and workmanship are the central issue. Standard policies do not pay to put right the defective work itself — that is the contractor's responsibility under the contract. What varies is whether the policy pays for consequential damage that the defect causes to surrounding, non-defective parts of the works. The market addresses this with defects exclusion clauses, commonly the LEG clauses (from the London Engineering Group) or the older DE ("Defects Exclusion") series. In plain terms:

• The narrowest forms (for example LEG 1 / DE1) exclude all loss connected with the defect, including damage it causes elsewhere.
• The middle forms (for example LEG 2 / DE3) pay for resulting damage to other property but exclude the cost of the defective item itself.
• The broadest forms (for example LEG 3 / DE5) pay for resulting damage and limit the exclusion to the additional cost of improving on the original defective design or workmanship.

Which clause applies has a direct bearing on what a defect-driven loss recovers, so it is a wording point worth checking before binding rather than after a claim.

Other common exclusions and limitations include wear and tear, gradual deterioration and rust, faulty or pre-existing damage to existing structures, consequential loss and delay (cover for that sits under delay-in-start-up / advance loss of profits, arranged separately), and pollution — sudden and accidental pollution may be covered to a limit, but gradual pollution is typically excluded.

How does it interact with other covers?

Contract works insurance does not stand alone. It is one part of a program, and the boundaries between policies are where gaps appear if the structure is not deliberate.

• Professional indemnity. Where the contractor carries design-and-construct or technical scope, liability from a design failure sits under professional indemnity, not contract works. The two policies meet at the defective-design line, which is why the LEG/DE wording and the PI cover need to be considered together.
• Contractors plant and equipment. Mobile plant, cranes and equipment the contractor owns or hires are usually insured under a separate plant policy rather than the contract works sum insured. For how that cover works, see contractors plant and equipment insurance.

Performance security often sits alongside contract works on the same project. Where the contract requires a performance bond or retention guarantee, that is a surety instrument issued by an APRA-regulated underwriter, not an insurance policy — see performance bonds in Australia and the broader surety bonds coverage.

Who arranges it — the principal or the contractor?

On Australian projects, contract works cover is arranged under one of two structures, and the contract decides which.

Under a contractor-arranged structure, the head contractor takes out the contract works policy and notes the principal and other relevant parties as interested parties. This is the common arrangement on most building and civil projects. Under a principal-arranged structure (sometimes called an owner-controlled insurance program), the principal arranges a single project policy covering the works for all parties on site, and contractors work to that policy rather than placing their own.

The structure changes what the contractor needs to carry, how excesses are borne, and where the gaps sit — a contractor working under a principal-arranged program still needs its own liability and plant cover for exposures the project policy does not pick up. For a full comparison, see principal-arranged vs contractor-arranged insurance and, for public-sector work, insurance requirements for government construction contracts.

How does it fit Australian standard contracts?

Most Australian construction work is let under a standard-form contract — commonly AS4000 (general conditions of contract), AS2124 (its older but still-used predecessor) or AS4300 (design-and-construct). Each contains an insurance clause that sets out who insures the works and the parties to be covered.

One terminology point matters when reading these clauses against a policy:

• Interested parties / noted parties. The contract usually requires the principal, and sometimes subcontractors and financiers, to be noted on the contract works policy so they have an insurable interest and the benefit of cover. Getting the noted parties right is what makes the policy compliant with the contract.

A representative composite: a civil contractor with $90m revenue won a $140m roads package under AS4000 and placed contract works cover at the tendered contract value. Mid-project variations and material escalation lifted the value at risk above the declared sum insured, and a storm event caused major damage to partially completed works. Because the sum insured had not been updated, average applied and the claim was reduced, leaving a high-six-figure shortfall the contractor funded itself. This is a representative composite, not a specific client outcome.

What $20M+ contractors most often get wrong is treating contract works as a tick-box at financial close: setting the sum insured at the tender value and never revisiting it, overlooking the LEG/DE wording, and failing to update noted parties as the project team changes. None of these surface until a claim — which is the worst time to discover them.

FAQ

What is contract works insurance in Australia?

It is a project-based policy covering physical loss or damage to the works during the build. It is also called construction works insurance or contractor's all risks. It runs from the start of works to completion and usually into a defects liability period.

What is the difference between contractor's all risks and construction works insurance?

In the Australian market the terms are largely interchangeable — both describe the same project cover for physical damage to the works during construction. "Erection all risks" is used more for plant-installation projects. What matters is the policy wording, the sum insured and the exclusions, not the label.

How is the sum insured for contract works calculated?

It starts with the full contract value and typically adds escalation and variations, removal of debris, professional fees and any principal-supplied materials the contract makes the contractor responsible for. Setting it at the tender value and not updating it for variations is the most common cause of underinsurance.

Does contract works insurance cover defective workmanship?

It does not pay to rectify the defective work itself — that is the contractor's responsibility. Whether it pays for resulting damage to other parts of the works depends on the defects exclusion clause (commonly the LEG or DE series). Companies in this position often check which clause applies before binding, as it materially changes a defect-driven claim.

Who arranges contract works insurance — the principal or the contractor?

Either, depending on the contract. Under a contractor-arranged structure the head contractor places the policy and notes the principal as an interested party. Under a principal-arranged program the principal insures the works for all parties on site. The contract specifies which structure applies.

How does contract works insurance fit AS4000 and AS2124?

These standard contracts contain an insurance clause setting who insures the works and the parties to be noted. The policy has to be structured to match — including noting the principal as an interested party.

Who arranges the insurance — the broker or the underwriter?

The cover is provided by APRA-regulated underwriters. A broker structures the policy, sets the sum insured against the contract, aligns the wording to the construction contract and manages claims. BCS Broking acts as the broker; it does not carry the risk.

Is contract works insurance the same as public liability?

No. Contract works is a first-party material damage cover on the works themselves. Public liability is a separate policy — usually the contractor's annual public and products liability cover — responding to third-party injury or property damage. Contract works does not provide liability cover; the two are arranged separately.

Where to next

Contract works cover is one part of a project program that also includes liability, plant and — where the contract requires it — surety. To explore further:

• The commercial insurance for Australian construction and mining pillar covers the broader program design context
• The construction & infrastructure insurance sector page and civil construction insurance page cover the sector-specific detail
• The contractors plant and equipment insurance guide covers how mobile plant is insured alongside the works
• The principal-arranged vs contractor-arranged insurance guide covers how the arranging structure changes what a contractor carries
• The mining contractor insurance checklist covers the broader program for resource-sector operators

For the contract and standards background, see Standards Australia and, on the role of brokers, the National Insurance Brokers Association.

If you would like a review of the contract works cover on a specific project, contact BCS Broking.

This information is general in nature and does not consider any specific objectives, financial situation or needs. Consider whether the information is appropriate before acting on it. BCS Broking Pty Ltd is an authorised insurance broker — cover is provided by APRA-regulated underwriters; BCS arranges it on the client's behalf (AFSL details on the Financial Services Guide).