- What "Project Insurance" Actually Means in Construction
- The Core Covers in a Construction Project Insurance Package
- How to Structure the Package: Key Decisions
- Common Coverage Gaps on Large Construction Projects
- Working with a Broker on Project Insurance
- Before You Request a Quote: What to Have Ready
- FAQs: Project Insurance for Construction
- Structure the Cover Before You Start
Structuring project insurance for construction is one of the most consequential decisions you'll make before breaking ground on a large build. Get it right and you have a financial safety net that covers the job from site establishment to practical completion. Get it wrong and a single incident — a fire, a flood, a structural collapse, a third-party injury — can wipe out your margin and expose you to personal liability that follows you long after the project ends.
This article walks through how project-specific insurance works, what cover you actually need for a single large build, how the layers fit together, and where builders and developers typically leave dangerous gaps.
What “Project Insurance” Actually Means in Construction
Project insurance is not a single policy. It's a coordinated package of covers arranged specifically for one construction project — usually running from commencement through to practical completion, and sometimes extending through the defects liability period.
Unlike annual trade policies that sit across your whole business, project insurance is scoped to a particular site, contract value, and timeline. That distinction matters. A large build has a fundamentally different risk profile from your day-to-day operations: the contract value is higher, the site exposures are concentrated in one location, and an uninsured loss is much harder to absorb.
For a single large build — a multi-storey residential development, a high-value commercial fitout, or a major civil infrastructure project — a project-specific structure is usually the right approach. Stretching an existing annual policy across something it was never sized for is a risk not worth taking.
The Core Covers in a Construction Project Insurance Package
Contract Works Insurance
Contract works insurance — also called construction all-risks or CAR insurance — is the foundation of any project package. It covers the physical works under construction against loss or damage from fire, storm, flood, theft, accidental damage, and malicious damage.
The sum insured should reflect the full contract value at completion, not the value of work done at any given point. Underinsuring the contract value is one of the most common mistakes on large builds, and it can trigger an averaging clause that reduces any claim payout proportionally.
Cover typically runs from the date the first materials arrive on site through to practical completion, with an option to extend through the defects liability period. Many policies also cover off-site materials in transit or storage — which matters on large projects where prefabricated components are manufactured elsewhere before delivery.
Public Liability Insurance
Public liability covers your legal liability for third-party bodily injury or property damage arising from construction activities. On a large build, this is non-negotiable. You're operating in proximity to members of the public, neighbouring properties, and subcontractors' personnel.
Most construction contracts in Australia require a minimum limit of $20 million, though many principal contractors and government clients now require $50 million or more. Check your contract carefully before assuming your existing limit is sufficient.
One important distinction: public liability under a project policy is scoped to that project. If you're relying on your annual business liability policy, confirm with your broker that the project doesn't exceed the policy's single-project sublimit or any geographic restriction.
Professional Indemnity
If your business carries any design responsibility — partial design input, design-and-construct obligations, or project management functions — professional indemnity cover belongs in the project package.
PI covers claims arising from errors, omissions, or negligent advice in your professional capacity. On a design-and-construct contract, the builder takes on design liability that a traditional construct-only contract doesn't carry. That liability doesn't disappear when the project finishes; PI claims often surface years after completion, so understanding how the policy responds to run-off claims is essential.
Workers Compensation
Workers compensation is a statutory obligation in every Australian state and territory — not optional cover. On a large build, your obligations extend to your direct employees on site. Subcontractors working under their own ABNs generally carry their own workers compensation, but verify this before they step on site. In some circumstances, liability for an uninsured subcontractor can fall back on the principal contractor.
Subcontractor Default and Performance Covers
Larger projects sometimes include cover for subcontractor default, particularly where a single subcontractor package represents a significant portion of the contract value. If a key subcontractor becomes insolvent mid-project, the cost of engaging a replacement and rectifying incomplete work can be substantial.
This cover isn't always standard and may need to be arranged separately. If your project has material subcontractor concentration risk, it's worth raising with your broker early.
How to Structure the Package: Key Decisions
Who Takes Out the Policy?
On a large build, the policy can be arranged by the principal contractor, the developer or owner, or jointly. A joint names policy — where both the principal contractor and the owner are named insureds — is often the cleanest structure. It prevents disputes about which party's policy responds to a loss and removes the risk of one insurer pursuing the other in subrogation.
Many construction contracts specify who is responsible for arranging project insurance. Read the contract before you assume. If the contract says the owner arranges it, confirm the policy is actually in place and that your interests as contractor are covered before work begins.
Setting the Sum Insured Correctly
The sum insured for contract works should reflect the full replacement cost of the completed structure, including materials, labour, and professional fees. On a large project, this figure needs to be reviewed if the contract value changes through variations. A significant scope increase that isn't notified to the insurer can create a coverage gap.
Also consider escalation clauses if the project timeline is long. Construction costs have moved materially in recent years, and a policy arranged at the start of a two-year project may be underinsured by completion if costs have risen.
Matching the Policy Period to the Project Timeline
Set the policy period to match the anticipated practical completion date — with a buffer. Projects run late. If your policy expires before practical completion, you'll need to arrange an extension, which is possible but costs more and requires the insurer to reassess the risk at that point.
The defects liability period is a separate consideration. Most contract works policies can be extended to cover the DLP, usually at a reduced rate since the physical works are complete. Whether you need this extension depends on your contract obligations and the defects-period risks you're carrying.
Coordinating with Subcontractors’ Insurance
On a large build, you'll have multiple subcontractors on site simultaneously. You need a clear protocol for verifying their insurance before they commence work. At a minimum, request a certificate of currency for their public liability and workers compensation before they start, and keep copies on file.
If a subcontractor's public liability limit is lower than yours, or their policy has exclusions relevant to their scope of work, you carry the residual exposure. Your broker can help identify where subcontractor insurance gaps create upward risk for the head contractor.
Common Coverage Gaps on Large Construction Projects
Existing structures: If you're building on or adjacent to an existing structure — a renovation, an extension, or a development on a site with existing buildings — check whether the contract works policy covers damage to those existing structures. Many policies exclude them unless specifically endorsed.
Delayed start and advance loss of profits: If the project involves a commercial building that will generate income on completion, the owner may want advance loss of profits cover to protect against revenue lost due to a delay caused by an insured event. This is a separate cover and needs to be arranged deliberately.
Cyber exposure: Large construction projects increasingly rely on connected systems — BIM platforms, project management software, site access controls, and payment systems. A cyber incident that disrupts project coordination or results in a fraudulent payment diversion isn't covered by a standard contract works or liability policy. If your project has significant digital infrastructure, a standalone cyber policy is worth considering alongside the physical covers.
Pollution liability: Standard public liability policies typically exclude gradual pollution. If your project involves excavation, demolition of older buildings with asbestos or lead paint, or work near waterways, a pollution liability extension may be necessary.
Defective workmanship: Most contract works policies exclude the cost of rectifying defective workmanship itself. They cover the resulting damage — if defective waterproofing causes water ingress that damages the structure, that resulting damage may be covered, but the cost of redoing the waterproofing is not. Understanding this distinction matters when reviewing what your policy actually pays for.
Working with a Broker on Project Insurance
A large build is not the place to arrange insurance through a comparison website or a generic commercial policy. The risk is too concentrated, the contract obligations are too specific, and the consequences of a gap are too significant.
A specialist construction insurance broker will review your contract, identify the required covers, and structure the package so the policies dovetail rather than conflict — before you need to make a claim.
ABS Insurance Brokers works with builders and construction businesses across Australia to arrange project-specific cover, including contract works, public liability, professional indemnity, and related construction covers. As part of the Steadfast Network, the firm has access to a wide panel of insurers — which matters when you're placing a large or complex project that needs competitive terms from markets that understand construction risk.
You can request a quote or speak directly with a broker at ABS Insurance Brokers.
Before You Request a Quote: What to Have Ready
Having the following information ready when you approach a broker will speed up the process and help ensure the quote reflects the actual risk:
- Full contract value, including known variations
- Project description and construction type (residential, commercial, civil, mixed-use)
- Site address and any site-specific hazards (flood zone, proximity to existing structures, contaminated land)
- Anticipated start date and practical completion date
- Defects liability period length
- Contract type (lump sum, design-and-construct, cost-plus, alliance)
- Principal contractor and owner details
- List of major subcontractor packages and their approximate values
- Any contract insurance requirements (minimum limits, joint names requirements, etc.)
The more complete your information, the more accurate the quote — and the less likely you are to face a coverage dispute later because the insurer wasn't told something material.
FAQs: Project Insurance for Construction
What is the difference between project insurance and an annual construction policy?
An annual construction policy covers your business's ongoing operations across multiple projects within a policy year. Project insurance is arranged specifically for one project, scoped to that project's contract value, site, and timeline. For large or high-value builds, a project-specific policy is usually more appropriate — it's sized correctly for the risk rather than relying on an annual policy that may have sublimits or aggregate constraints.
Does contract works insurance cover all subcontractors automatically?
Not always. Some contract works policies extend cover to subcontractors working on the project as unnamed insureds, but others don't. Check the policy wording and confirm with your broker whether subcontractors are covered and under what conditions. Regardless, you should still require subcontractors to carry their own public liability insurance.
What happens if the project runs over time and the policy expires?
You need to arrange an extension before the policy lapses. Contact your broker as soon as you know the project will run late. Extensions are generally available but may be subject to reassessment of the risk and an additional premium. Letting the policy lapse and trying to reinstate it after the fact is much harder and may leave you uninsured for the period in between.
Is professional indemnity always required on a construction project?
It depends on your contract. If you have any design responsibility — including design-and-construct obligations or project management functions — you need professional indemnity cover. If you're a pure construct-only contractor with no design input, PI may not be required for the project itself, but your broker can advise based on your specific contract.
Can the owner and contractor be on the same project insurance policy?
Yes. A joint names policy is a common and often preferable structure on large builds. Both parties are named insureds, which prevents disputes about which party's policy responds to a loss and removes the risk of one insurer pursuing the other in subrogation after a claim.
What does the defects liability period cover under a project insurance policy?
During the defects liability period, the physical construction works are complete, so the risk profile changes. Most policies can be extended to cover the DLP, typically at a reduced rate. Cover during this period usually focuses on damage to the completed works rather than active construction risk. Check your contract to understand your obligations during the DLP and discuss the appropriate extension with your broker.
How is the sum insured calculated for a large build?
The sum insured should reflect the full replacement cost of the completed structure — materials, labour, and professional fees — not just the contract value at commencement if significant variations are anticipated. On long projects, consider whether an escalation clause is appropriate to account for cost movements over the build period. Underinsuring the contract value is a common mistake that can reduce claim payouts through averaging provisions.
Structure the Cover Before You Start
Project insurance for construction is not something to arrange in a hurry once the contract is signed. The structure of your cover should be confirmed before site establishment, the sum insured should reflect the full project value, and the policy period should run through to practical completion with a realistic buffer.
A large build concentrates significant financial risk in one place for an extended period. The right project insurance package doesn't just protect against catastrophic loss — it gives you, your client, and your financiers confidence that the project can be completed even if something goes wrong.
Speak with a specialist construction broker early in the process, bring your contract details, and make sure the cover is structured to match the actual risk rather than whatever happened to be on the shelf.
