Introduction
If you run a building company in Australia, workers compensation insurance is not optional — it is a legal requirement in every state and territory. For builders managing multiple trades across different sites, the obligations can get complicated fast. Are your apprentices covered? What about the subcontractors you bring onto a job? Does your policy follow your crew from one site to the next?
This guide walks you through how workers compensation works for building companies in 2026, including the state-by-state differences that catch out builders who work across borders. It covers who needs coverage, what happens when a worker is injured on site, and how to make sure your business stays compliant without overpaying.
Workers compensation is not a one-size-fits-all product. Each state runs its own scheme with different insurers, premium calculations, and rules about who must be covered. If you work across state lines, you may need multiple policies.
What Is Workers Compensation Insurance?
Workers compensation is a statutory insurance scheme that covers the costs of work-related injuries and illnesses. If one of your employees — or in some cases, a contractor deemed to be a worker — is injured on the job, workers comp pays for their medical treatment, rehabilitation, and a portion of their lost wages while they recover. It also provides lump-sum compensation for permanent impairment and, in the worst cases, death benefits for families.
For building companies, the stakes are particularly high. Construction is one of Australia’s most dangerous industries. Safe Work Australia data consistently ranks construction near the top for serious injury claims, and the nature of the work — heights, heavy machinery, electrical hazards, repetitive strain — means claims tend to be expensive when they happen.
Without workers comp, your business is personally liable for all of those costs. Medical bills, ongoing care, and legal fees can run into the hundreds of thousands — potentially enough to bankrupt a small to medium building company. On top of the financial risk, failing to hold workers comp when required attracts significant fines from state regulators. In some states, company directors can be held personally liable for uninsured periods.
Who Needs Workers Comp in a Building Company?
The short answer: if you employ anyone, you almost certainly need workers comp. But the definition of “worker” varies between states, and this is where building companies often get tripped up.
Direct Employees
Wages staff — carpenters, labourers, site supervisors, office admin, estimators — are clearly workers for workers comp purposes. You must cover them from day one of employment. There is no minimum hours threshold or probationary period that exempts you.
Apprentices and Trainees
Apprentices are covered differently depending on your state. In some jurisdictions, the apprentice’s registered training organisation or group training scheme holds the workers comp policy. In others, you as the host employer are responsible. Check your state’s specific rules — and if you employ apprentices directly rather than through a group scheme, you definitely need to cover them yourself.
Company Directors
This is a common blind spot. In most states, working directors of a Pty Ltd company are not automatically covered by workers comp. You may need to nominate yourself for coverage, particularly if you are on the tools. If you’re a director who swings a hammer or walks sites, and you injure yourself without having opted into workers comp, you may have no claim. This is worth checking with your insurer or your state regulator directly.
Subcontractors — the Grey Area
Whether a subcontractor is considered a “worker” for workers comp purposes depends on the nature of the relationship, not what the contract says. A subcontractor who works exclusively or primarily for your company, uses your tools, wears your uniform, and works hours you set may be deemed a worker regardless of having an ABN. This is a high-risk area for building companies. If a subcontractor is injured on your site and the regulator determines they were effectively an employee, your business could be on the hook for an uninsured workers comp claim plus penalties.
The safest approach: if you are unsure about a subcontractor’s status, seek advice from your state workers comp authority or a specialist insurance broker. Trying to save on premiums by classifying workers as contractors can backfire spectacularly.
State-by-State Workers Comp Schemes for Builders
Workers compensation in Australia is not a national system. Each state and territory operates its own scheme, with different insurers, premium structures, and rules. Here is how each jurisdiction handles workers comp for the building and construction industry as of 2026.
New South Wales
In NSW, workers compensation is managed by icare (Insurance and Care NSW), with underwriting handled by a single insurer. The scheme is compulsory for all employers, including those with only one worker. Premiums are calculated based on your industry classification and wage estimates.
The building and construction industry in NSW has specific rate classifications that reflect the higher risk profile of site-based work. Clerical staff working in an office are rated at a much lower percentage than a carpenter working at height. If your building company has a mix of roles, your premium will be a blended rate across classifications.
NSW also has a strong focus on return-to-work programs. Builders who can demonstrate effective injury management and early return-to-work outcomes may qualify for premium discounts through icare’s performance incentive programs.
Victoria
WorkSafe Victoria is the sole authority for workers comp in Victoria. The scheme covers all employers, and like NSW, premiums are experience-rated — your claims history directly affects what you pay.
Victoria has particular rules around owner-builders and working directors. If you are a director of a building company who performs manual work, you should check whether you need to be nominated for coverage. Victoria also has specific requirements for builders working on domestic construction sites where the project value exceeds a certain threshold.
Queensland
WorkCover Queensland is the compulsory insurer for most employers in the state. Queensland uses a wages-based premium model with industry classification rates, similar to NSW and Victoria.
One point worth watching in Queensland: the definition of “worker” under the Workers Compensation and Rehabilitation Act is broad. Even if you engage someone with an ABN and a written contract stating they are an independent contractor, the statutory test looks at the reality of the arrangement. Many building companies in Queensland have been caught out by this. If a subcontractor works under your direction and control, uses your equipment, and is paid by the hour rather than by the job, WorkCover Queensland may treat them as a worker.
Western Australia
WorkCover WA oversees the scheme, but unlike the eastern states, workers comp in WA is underwritten by private insurers licensed by WorkCover. This means building companies can shop around for coverage — though the premium rates themselves are regulated, so the differences between insurers tend to be in service and claims management rather than price.
WA also has specific provisions for working directors and for contractors in the building industry. The Construction Industry Long Service Leave scheme operates alongside workers comp, and there can be interactions between the two that are worth understanding if you employ staff on major commercial projects.
South Australia
ReturnToWork SA is the scheme operator and sole insurer in South Australia. The scheme underwent significant reform several years ago and operates on a “no-fault” basis — meaning injured workers do not need to prove the employer was negligent to receive benefits. In return, common law damages claims against employers are generally restricted.
South Australian builders should pay attention to the registered contractor provisions. If you engage subcontractors who are not registered with ReturnToWork SA as self-insured, you may be liable for their workers comp coverage. This is a trap that catches interstate builders working on SA projects.
Tasmania
WorkSafe Tasmania administers the workers comp scheme, with coverage provided by private insurers. Tasmania has a relatively straightforward scheme, but the small size of the market means there are fewer insurers to choose from than in WA.
Builders in Tasmania should be aware of the requirement to display a current certificate of currency at each workplace, including each construction site. Failing to display a valid certificate can result in fines even if you hold coverage.
Northern Territory
NT WorkSafe manages the scheme in the Northern Territory. Coverage is mandatory for all employers. The NT has some of the highest premium rates in the country for construction classifications, reflecting the remote working conditions and higher risk profile of building work in the Territory.
If you are a building company based in another state but taking on a project in the NT, you need to check whether your existing policy provides extraterritorial coverage or whether you need a separate NT policy. Most state-based policies provide limited cross-border cover — typically for temporary work trips, not for multi-month construction projects.
Australian Capital Territory
The ACT scheme is administered by WorkSafe ACT, with coverage provided by private insurers. The ACT market is small, with a limited number of licensed insurers. Building companies based in NSW who work in Canberra should be particularly careful — the border proximity means many builders operate on both sides, and a NSW icare policy may not cover ACT-based work beyond a short period.
Comcare (Federal)
If your building company does work for the Commonwealth Government or certain large national employers that are self-insured under the Comcare scheme, different rules apply. Most residential and commercial builders will never encounter Comcare, but it is worth knowing about if you tender for federal government construction contracts.
Multi-Trade Sites and Workers Comp
This is where workers comp for building companies gets particularly nuanced. A typical construction site might have your direct employees, subcontractors from multiple trades, labour-hire workers, and apprentices from group training schemes — all working alongside each other.
Your workers comp policy covers your direct employees. It generally does not cover subcontractors, but as noted above, the line between subcontractor and employee is not always clear. To manage this risk on multi-trade sites, many head contractors now require subcontractors to provide evidence of their own workers comp coverage before stepping onto site. This is good practice — it protects both you and the subcontractor.
If you are a head contractor or principal contractor on a multi-trade site, requiring proof of workers comp from every subcontractor is one of the simplest and most effective risk management steps you can take before work begins.
For labour-hire arrangements, the workers comp obligation usually sits with the labour-hire company, not with you as the host. But you should verify this before any labour-hire workers start on your site. Ask for a copy of the labour-hire company’s current workers comp certificate and check that it covers the classifications the workers will be performing.
How Premiums Are Calculated for Building Companies
Workers comp premiums for building and construction businesses are generally calculated as:
Your estimated annual wages multiplied by an industry classification rate, adjusted for your claims experience.
The industry classification rate is set by the state regulator or scheme actuary based on the historical claims experience of that industry. Construction rates are, predictably, among the highest of any industry — reflecting the higher likelihood and average cost of workplace injuries in building work.
Within construction, different roles attract different rates. A bricklayer’s rate is higher than a general labourer’s. A roofer’s rate is higher than a carpenter working at ground level. An office-based estimator has a much lower rate than anyone on site. Getting these classifications right matters — under-declaring risk by classifying site workers as clerical staff is a fast way to end up with a premium adjustment and potential penalties at audit time.
The Impact of Claims on Your Premium
In most states, workers comp is experience-rated. This means if your business has a higher-than-average claims frequency or claims cost relative to other businesses in your industry, your premium will increase. Conversely, a strong safety record with few or no claims can reduce your premium.
For building companies, even one serious claim — a fall from height, a back injury from manual handling — can push your premium up for several years. This is why safety is not just a compliance obligation; it directly affects your bottom line.
Estimated Wages and Annual Reconciliation
Workers comp premiums are typically based on an estimate of your annual wages at the start of the policy period. At the end of the year, your insurer or scheme agent will reconcile your actual wages against the estimate and issue an adjustment — either a refund if you overestimated, or a bill if you underestimated.
For building companies with fluctuating workforce numbers, this can be tricky. If you win a big project mid-year and hire additional staff, your actual wages may significantly exceed your estimate. The adjustment bill at year-end can be a nasty surprise if you have not budgeted for it. The solution: update your wage estimate with your insurer when your workforce changes substantially, rather than waiting for the year-end reconciliation.
Steps to Get Workers Comp for Your Building Company
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Determine which state scheme(s) apply to your business. If all your work is in one state, the answer is straightforward. If you work across borders, you may need multiple policies.
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Classify your workers correctly. Work with your insurer or a broker to map each role in your business to the correct industry classification. This is not a place to cut corners — incorrect classifications lead to compliance problems.
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Estimate your annual wages as accurately as possible. Include all remuneration: base wages, overtime, allowances, superannuation (in some states), and bonuses. Over-estimating ties up cash flow but leads to a refund; under-estimating leads to a bill you may not be ready for.
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If you are a working director, confirm whether you need to nominate for coverage. In most states, working directors are not automatically covered and must opt in.
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Obtain your certificate of currency and display it at your principal place of business and on each job site where required.
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Implement a safety management system and return-to-work program. This reduces the likelihood of injuries and the cost of claims when injuries do occur — both of which keep your premium down over time.
For builders who want to compare workers comp options or need help navigating the state-by-state complexity, an online business insurance comparison platform can help you see options from multiple insurers across different states. This can be a starting point if you are setting up coverage for the first time or reviewing your existing arrangements.
Common Mistakes Building Companies Make
Assuming Subcontractors Don’t Need to Be Covered
This is the most frequent and most expensive mistake. Just because someone has an ABN does not mean they are not a worker for workers comp purposes. The statutory test in most states looks at the reality of the working relationship, not the label on the contract. If you control how, when, and where the person works, and they are not genuinely running their own independent business, they may be deemed a worker. If you have not covered them, you are uninsured — and the financial consequences are severe.
Forgetting About Interstate Work
A builder based in Albury who takes on a project across the river in Wodonga has moved from NSW to Victoria. The NSW workers comp policy may provide limited cross-border cover for short trips, but a six-month construction project is not a short trip. If you work across state lines, talk to your insurer about whether you need coverage in both states.
Not Covering Working Directors
If you are a director who is on the tools and you are injured, you want to be able to claim workers comp. In most states, you are not automatically covered. Check with your insurer that you have been nominated and that your coverage is active.
Misclassifying Roles to Lower Premiums
Classifying a site-based carpenter as a clerical worker to reduce your premium rate is effectively fraud. Insurers audit wage declarations, and if they find misclassifications, you will face a premium adjustment going back years, plus interest and potentially penalties. The short-term saving is not worth the long-term risk.
Not Updating Wage Estimates
If your workforce doubles mid-year and you do not update your wage estimate, the year-end reconciliation bill can be substantial. It is better to voluntarily update your estimate and smooth the cash flow impact than to receive a large, unexpected invoice.
Do You Need Workers Comp as a Sole Trader Builder?
If you are a sole trader with no employees, the answer in most states is: you are not legally required to hold workers comp for yourself. However, you may still want to consider it. If you are injured on the job and cannot work, you have no sick leave, no annual leave, and no employer to cover your income. Workers comp fills that gap — but only if you have opted in.
Some states allow sole traders to purchase voluntary workers comp coverage for themselves. This gives you access to weekly benefits, medical treatment, and rehabilitation if you are injured at work. The cost varies by state and by the level of cover you choose.
Separately, sole traders should consider income protection insurance, which covers you for illness or injury regardless of whether it is work-related. Workers comp only covers work-related injuries, so pairing both gives you more complete coverage.
Even if you are not required to cover yourself, if you engage any help — even a casual labourer for a few days — you likely need workers comp. The threshold for “employing a worker” is low, and the penalties for being uninsured are high.
What Happens When a Claim Is Made
When a worker on your building site is injured, the process is straightforward but time-sensitive:
Step 1: Notify your insurer. Most states require you to notify your workers comp insurer within 48 hours of becoming aware of a workplace injury. Do not delay this — late notification can result in penalties and may complicate the claim.
Step 2: Support the injured worker. Arrange medical treatment immediately. Provide the worker with a claim form and the insurer’s contact details. Your insurer will guide the worker through the claim lodgement process.
Step 3: Cooperate with the insurer. The insurer will investigate the claim, which may involve gathering witness statements, medical reports, and site safety records. Be transparent and responsive — obstructing an investigation rarely ends well.
Step 4: Plan for return to work. Most state schemes emphasise early return to work, even if the worker cannot immediately return to their pre-injury duties. This might mean modified duties (lighter work), reduced hours, or a gradual return-to-work plan. Engaging with this process early benefits everyone — the worker recovers faster, and your premium experience is better because the claim costs less.
Step 5: Review the incident. After the claim is underway, investigate what happened and whether any changes to your site safety practices could prevent a recurrence. This is not about assigning blame — it is about continuous improvement. A strong post-incident review process signals to insurers that you take safety seriously, which can help at renewal time.
Frequently Asked Questions
Is workers comp tax deductible for building companies?
Yes, workers compensation premiums are generally tax deductible as a business operating expense for Australian building companies. You should confirm the specific treatment with your accountant or tax professional, as individual circumstances can vary. This is general information only and not tax advice.
Can I use one workers comp policy for work in multiple states?
It depends on your home state and where you are working. Most state-based workers comp policies include some extraterritorial cover — typically for short-term, temporary work in another state (e.g., up to a few weeks). However, if you have an ongoing presence in another state — such as a project that runs for several months — you will likely need a separate policy in that state. Check with your insurer rather than assuming you are covered.
What happens if a subcontractor’s worker is injured on my site?
If the subcontractor is legitimately running their own business and holds their own workers comp policy, their policy should respond to their worker’s injury. However, if the subcontractor does not hold workers comp and their worker is deemed to be your employee (due to the nature of the working relationship), your policy — or worse, your personal liability — may be on the hook. This is why verifying subcontractors’ workers comp status before they start on site is essential.
How much does workers comp cost for a building company?
Premiums vary significantly based on your state, your total wages, your industry classifications, and your claims history. As a broad indication for a small building company with a handful of employees, annual premiums typically range from a few thousand dollars to tens of thousands. The exact cost depends on your specific circumstances — this is not a product with a fixed price list. For a personalised quote based on your business, you can compare options through BizCover’s online platform.
What is the difference between workers comp and public liability insurance?
Workers compensation covers injuries to your own employees. Public liability insurance covers injury or property damage to third parties — clients, members of the public, visitors to your site, and other people who are not your employees. Both are essential for building companies, but they cover entirely different risks. Holding one does not satisfy the legal requirement for the other.
Disclosure
The information in this article is general in nature and does not take into account your individual circumstances. Workers compensation requirements vary by state and by business structure. Before purchasing or renewing any insurance policy, you should read the relevant Product Disclosure Statement (PDS) and consider whether the product is appropriate for your needs. This article does not constitute financial, legal, or insurance advice. Buildercover.au is an independent affiliate site that may earn a commission if you purchase insurance through a linked provider, such as BizCover. This does not affect the price you pay. For advice tailored to your situation, speak to a qualified insurance broker or financial adviser.