As a builder starting a new project, you’ve probably been asked for contract works insurance before you set foot on site. It can feel like just another box to tick in the contract, but the reality is this cover can become the financial backbone of your project if things go wrong mid‑build. Here we break down what contract works insurance actually covers, how it sits alongside your public liability cover, and why the term “construction all risks” sometimes appears when you’re pricing a larger commercial or civil job.
What is contract works insurance?
Contract works insurance is a short‑term policy designed to protect the physical construction project itself while it’s underway. Think of it as cover for the materials, labour and partially completed structures sitting on your site. It typically responds to loss or damage from events like fire, storm, theft, vandalism, impact by vehicles, and accidental damage during the build. Some policies can also cover your own plant and equipment on site, temporary site buildings, and even removal of debris after a loss.
The cover normally starts when you take possession of the site or when materials are first delivered, and it finishes when the project is handed over to the client or reaches practical completion. Because the policy is tied to a specific project, not your whole business, you can arrange it one job at a time or as part of an annual facility if you run multiple projects.
How contract works insurance differs from public liability
It is easy to confuse the two, but they protect completely different things.
- Contract works insurance covers the project itself – the bricks, timber, steel, windows and everything else that forms part of the permanent structure, plus often temporary works and materials on site.
- Public liability insurance covers your legal liability if your building activities cause injury to a third party (other than an employee) or damage to someone else’s property. For instance, if a falling tool damages a neighbouring car or a visitor trips on site, that is a liability claim.
Most building contracts and principal‑builder agreements will demand you hold both. They complement each other: contract works covers your own project’s physical assets, while public liability covers the wider consequences of what your business does to other people and their property.
When is construction all risks (CAR) insurance needed?
On larger residential, commercial or civil engineering projects, you will often see a requirement for a “construction all risks” policy. In practice, CAR is a packaged contract works policy that rolls together material damage cover for the construction project and third‑party liability cover in a single place. It is common on projects where the principal contractor takes overall responsibility for site safety and all works being carried out, including those of subcontractors.
CAR can be written in the name of the principal contractor, with the project owner and financiers noted as interested parties. This structure suits multi‑trade developments, apartment builds, industrial sheds and infrastructure contracts where the contractual chain is complex. The “all risks” wording does not mean literally everything is covered—there will always be exclusions like wear and tear, defective design, and consequential financial loss—but it provides a broad starting point that can be negotiated to fit a particular contract.
If you mainly handle smaller residential work, a standalone contract works policy may be sufficient and simpler to arrange. For anything with a high contract value, multiple trades or a principal contractor role, a CAR policy is often what the project owner, bank or government body will ask to see before you can break ground.
What to look at when you arrange cover
Every contract is different, so reading your building agreement carefully is critical. Look for:
- the required sum insured (it should reflect the full reinstatement value at completion, not just your own costs);
- the duration of cover and any automatic extensions for defects liability periods;
- whether cover for existing structures or surrounding property is required;
- any special perils the project site faces, such as flood or bushfire, and how the policy responds;
- whether subcontractors’ equipment and materials need to be included.
These details are not trivial—getting them wrong can leave you carrying a large uninsured loss or breach your contract.
How BuilderCover can help
BuilderCover provides general business insurance information tailored to Australian builders. We do not underwrite policies, act as an insurance broker, or promise what any policy will pay or cost. The information here is general and does not take into account your individual financial situation or project needs. For specific advice on your business circumstances, you should consult a qualified insurance broker or authorised representative who can assess your contractual obligations and recommend a suitable solution.
If you want to explore options, BuilderCover can accept your enquiry and connect you with appropriately authorised assistance.
Understanding contract works insurance early—before you finalise your project costings—can save a lot of stress and protect your business from a serious financial hit. Whether you go with a simple contract works policy or a full CAR wrap, making the cover match the contract is the part that counts.