- What Is Single Project Insurance?
- Who Buys Single Project Cover and Who Does It Protect?
- How Single Project Insurance Is Priced
- When Single Project Insurance Beats an Annual Policy
- When an Annual Policy Is the Better Fit
- The Shared Aggregate Problem Is Real
- What Single Project Insurance Typically Covers
- A Decision Framework
- Getting the Structure Right
- FAQs
- The Bottom Line
If you're a builder or contractor who takes on one large job every year or two, paying for a full annual policy can feel like buying a season pass to a venue you visit once. Single project insurance exists precisely for that situation — and knowing when it genuinely outperforms an annual policy can save you money, close coverage gaps, and satisfy contract requirements you might not even realise you have.
This article covers what single project insurance is, how it's priced, and the specific circumstances where it's the smarter structural choice.
What Is Single Project Insurance?
Single project insurance is a policy written for one construction project. Rather than covering all the work a business undertakes over a 12-month period, it wraps around a defined scope: a named site, a fixed contract value, a set construction period, and a clear list of insured parties.
The policy typically ends when the project reaches practical completion, though most include a defects liability period and — for professional indemnity covers — a post-completion tail.
An annual policy works differently. It covers all projects you undertake during the policy year up to an aggregate limit, and that limit is shared across every job. If one large claim eats into the aggregate, every subsequent project on that policy is left with a reduced pool of cover.
Who Buys Single Project Cover and Who Does It Protect?
The buyer is usually the principal contractor, the project owner, or a developer. On larger jobs, the policy can be structured to cover multiple parties at once: the head contractor, subcontractors, the owner, and sometimes the financier or lender.
That multi-party structure is one of the features that makes project-specific cover attractive on complex builds. Everyone working on the project sits under the same dedicated limits, rather than relying on their individual annual policies to mesh together cleanly — which they often don't.
How Single Project Insurance Is Priced
Several factors drive the premium on a project-specific policy:
- Contract value — the higher the build cost, the higher the premium base
- Project type and complexity — tunnelling, demolition, and high-rise work attract higher rates than standard residential construction
- Construction period — a longer programme means more exposure time
- Site conditions — proximity to existing structures, flood zones, or contaminated land
- Deductibles — higher excesses reduce the premium but shift more risk back to the insured
The Business Research Company's 2026 market report put the global construction project insurance market at $8.38 billion in 2025, growing to $8.86 billion in 2026 and projected to reach $10.98 billion by 2030. That growth reflects how widely project-specific structures are being adopted, particularly on infrastructure and large residential projects.
For a sense of scale at the smaller end: Tank cited an example of a NSW builder placing single-project cover for an $800,000 dual-occupancy build with a 15-month construction period for approximately $4,500. That figure is illustrative rather than a quote benchmark, but it makes clear that project-specific cover isn't reserved for mega-projects.
When Single Project Insurance Beats an Annual Policy
This is the decision most builders and contractors get wrong. The instinct is to assume an annual policy is always more efficient — you pay once and move on. That's true for high-volume businesses running many similar jobs. It's often not true in the scenarios below.
You’re Taking On One Large or Unusual Job
If a single project represents 60 to 80 percent of your annual turnover, your annual policy's aggregate limit is effectively tied to that one job. A major claim on that project could exhaust your aggregate, leaving the rest of your work exposed for the remainder of the year.
A dedicated project policy ring-fences that exposure. The project has its own limits. Your annual policy stays intact.
The Contract Requires Dedicated Limits
Principals, developers, and government clients increasingly specify that the head contractor must hold project-specific cover with minimum limits that can't be shared with other work. If your annual policy doesn't satisfy that requirement, you either need to buy a project policy anyway or walk away from the contract.
Lenders are also a driver here. A financier funding a $20 million development wants to see that the insurance protecting their security isn't being diluted by claims from a dozen other jobs running simultaneously on the same annual policy.
The Project Is Outside Your Normal Scope
An annual policy is underwritten based on your typical work type and turnover. If you normally build residential homes but win a contract to refurbish a heritage-listed commercial building, your annual policy may not cover that scope at all — or it may cover it with exclusions that only surface at claim time.
A project-specific policy is underwritten for exactly what you're building. The insurer prices the actual risk rather than approximating it from your trading history.
You’re a One-Off or Occasional Builder
Owner-builders, developers who build one project every few years, and investors who retain some insurable interest don't need a continuous annual policy. Single project cover gives them appropriate protection for the duration of the build without paying for 12 months of coverage they don't need.
The Project Has a Long Programme
Annual policies renew every 12 months. A two-year construction programme means you're renewing mid-project, which introduces the risk of changed terms, premium increases, or — in a hardening market — a carrier declining to renew. A single project policy locks in terms for the life of the project, including the defects liability period.
When an Annual Policy Is the Better Fit
Single project cover isn't always the right answer. If you're running 15 to 20 jobs per year of similar size and type, the administrative overhead of placing a separate policy for each one outweighs the benefits. Annual policies are efficient for volume builders and trade contractors with consistent workloads.
The tipping point tends to come down to project complexity and value relative to your overall turnover. A business whose largest single project is no more than 20 to 25 percent of annual revenue is usually well served by an annual policy with appropriate limits.
The Shared Aggregate Problem Is Real
Arch Insurance's 2026 research found that 85 percent of organisations reported increased risk exposure over the prior 12 months, and 66 percent increased their risk and insurance expenditure in the same period. That environment makes aggregate erosion a genuine concern rather than a theoretical one.
When multiple projects share an annual aggregate and claims activity is rising across the industry, the probability that one project's losses eat into another project's protection increases. Project-specific limits eliminate that problem entirely for the projects they cover.
What Single Project Insurance Typically Covers
A project-specific package usually combines several covers:
- Contract works (material damage) — covers physical loss or damage to the works under construction
- Public and products liability — covers third-party bodily injury and property damage arising from the project
- Professional indemnity — covers design errors and professional negligence, often with a post-completion tail
- Delay in start-up or advance loss of profits — relevant where the project generates revenue on completion
It's worth being clear that a project policy doesn't automatically replace every cover you need. Plant and equipment, workers' compensation, and management liability typically sit outside the project structure and require separate arrangements.
A Decision Framework
Before choosing between project-specific and annual cover, work through these four questions:
- Does this project represent more than 30 percent of my annual turnover? If yes, dedicated limits are worth pricing.
- Does the contract or lender require project-specific cover? If yes, the decision is already made for you.
- Is this project outside my normal work type? If yes, your annual policy may not respond as expected.
- Does the construction programme extend beyond 12 months? If yes, project-specific cover removes renewal risk.
If you answer yes to any of these, the conversation with your broker should start with a project policy quote alongside your annual renewal — not instead of it.
Getting the Structure Right
The most common mistake buyers make is assuming a project policy is a complete substitute for their annual programme. It isn't. It covers the project. Your annual policy still needs to address your business-wide exposures: ongoing trade liability, your premises, your vehicles, and any work that falls outside the project structure.
The other trap is underestimating the post-completion tail. Professional indemnity claims on construction projects often emerge years after handover, when a defect becomes apparent or a design error causes a failure. A project-specific professional indemnity policy needs a tail period long enough to capture that exposure — typically three to six years, sometimes longer for complex structures.
Working with a specialist broker is the most reliable way to avoid those gaps. ABS Insurance Brokers works with builders, developers, and contractors across Australia to structure cover that matches the actual risk — whether that's a standalone project policy, an annual programme, or a combination of both.
FAQs
What is single project insurance?
Single project insurance is a policy written specifically for one construction project. It covers a defined scope — a named site, a fixed contract value, and a set construction period — rather than all the work a business undertakes over a 12-month period.
How is single project insurance different from an annual policy?
An annual policy covers all projects during the policy year up to a shared aggregate limit. A single project policy gives one project its own dedicated limits, so a large claim on that project doesn't reduce the cover available to other work.
Who should consider single project insurance?
Builders or developers whose largest project represents a significant portion of annual turnover, those working outside their normal scope, those with contracts requiring dedicated limits, and anyone with a construction programme longer than 12 months are the most common candidates.
Does single project insurance replace public liability?
Not necessarily. A project-specific package can include public liability for the project, but your business-wide public liability for activities outside that project still needs to be covered separately. Your broker should map both exposures before you decide.
How long does a single project policy last?
The policy runs for the construction period plus the defects liability period. Professional indemnity extensions typically add a post-completion tail of three to six years or more, depending on the project type and contract requirements.
Is single project insurance more expensive than an annual policy?
It depends on the project. For a large, complex, or long-duration build, a dedicated policy may cost less than the additional premium required to adequately extend an annual policy's limits and scope. For high-volume builders running many similar jobs, annual policies are usually more cost-efficient.
Can subcontractors be included in a single project policy?
Yes. Project-specific policies can be structured to cover the head contractor, subcontractors, the owner, and the financier under the same set of limits — avoiding the gaps that can appear when multiple parties rely on separate annual policies to work together.
The Bottom Line
Single project insurance isn't a niche product for mega-projects. It's a practical tool for any builder, developer, or contractor whose work doesn't fit neatly into the assumptions behind a standard annual policy. The decision comes down to project size relative to your overall turnover, contract requirements, work type, and programme length.
If any of those factors point toward a dedicated structure, get a project-specific quote before you default to your annual renewal. The difference in protection — and sometimes in cost — can be significant.
For tailored advice on structuring cover for your next project, ABS Insurance Brokers can help you compare options and find the right fit.
