- What "Owner Builder" Actually Means for Insurance
- The Core Policies on Your Checklist
- State-by-State Rules You Need to Know
- Pre-Build Insurance Checklist by Stage
- Subcontractor Insurance: The Gap Most Owner Builders Miss
- What Happens When Policies Overlap
- Handover: Transitioning Back to Standard Home Insurance
- How a Broker Helps With Owner Builder Insurance
- FAQs
- Before You Break Ground
Taking on a build as your own project manager is genuinely rewarding — but owner builder insurance is the part most self-managers underestimate until something goes wrong. A subcontractor slips on site. A storm damages the frame mid-build. You sell the property three years later and the buyer's conveyancer flags a warranty gap. Each scenario has a different policy attached to it, and the consequences of missing one can follow you for years.
This checklist covers every cover type you need, when to buy it, what state rules apply, and how to handle the handover back to standard home insurance once the build is done.
What “Owner Builder” Actually Means for Insurance
An owner builder is someone who takes out a building permit in their own name and manages the construction of their own home, rather than engaging a licensed builder to do it. You are legally the builder of record — which means the liability that would normally sit with a licensed contractor sits with you instead.
That shift in liability is why owner builder insurance is not a single product. It is a collection of policies that together replicate the protection a licensed builder would carry as a matter of course.
The Core Policies on Your Checklist
Contract Works (Builders Risk) Insurance
Contract works insurance covers the physical structure under construction against fire, storm, theft, vandalism, and accidental damage. It runs from the day work starts until practical completion, and the sum insured should reflect the full replacement cost of the completed build — not just the materials on site at any given moment.
Common exclusions include faulty workmanship, design defects, and gradual deterioration. If a subcontractor's poor work causes a collapse, that is typically excluded from the contract works policy itself, though it may be recoverable under the subcontractor's own liability cover.
Public Liability Insurance
Public liability protects you if a third party is injured or their property is damaged because of your build. A visitor, a neighbour, a delivery driver — anyone who is not your employee can make a claim against you personally as the owner builder.
Built Simple's 2026 builder insurance guide puts the practical floor for public liability cover at $20 million. For a residential build, that is the minimum worth considering. Some lenders and councils require evidence of this cover before work can begin.
Home Warranty Insurance (Domestic Building Insurance)
This is the policy most owner builders misunderstand. Home warranty insurance — called Domestic Building Insurance in Victoria — is a statutory product in most states that protects a future buyer if defects emerge after you sell. It is not for your benefit during the build. It is for the buyer's benefit after the sale.
The trigger is the decision to sell. In most states, if you sell within a defined window after completion, you are required to hold a home warranty policy. In New South Wales, that window is six years for structural defects and two years for non-structural defects. Victoria operates its own scheme with different thresholds.
Draftee's 2026 industry data puts home warranty insurance at between $2,000 and $8,000 on its own, while a total owner builder insurance package for a granny flat can sit between $5,000 and $12,000 depending on state, build value, and sale plans.
Workers Compensation
If you engage any workers directly as employees rather than as subcontractors, you are required by law in every Australian state and territory to hold workers compensation insurance. Most owner builders use subcontractors — but if the arrangement looks like employment in substance, the obligation applies regardless of what the contract says.
Personal Accident and Income Protection
Owner builders are not covered by workers compensation for their own injuries. If you are working on site and you fall, there is no employer to make a claim against. Personal accident cover fills that gap, providing a benefit if you are injured and cannot work during the build.
State-by-State Rules You Need to Know
Australia does not have a single national framework for owner builder insurance. Requirements vary by state, and the differences matter.
New South Wales: Owner builder permits are required for projects over $10,000. Home warranty insurance — called Home Building Compensation in NSW — is mandatory if you sell within six years of completion for structural defects. The scheme is administered by the State Insurance Regulatory Authority.
Victoria: Domestic Building Insurance is compulsory if the contract price exceeds $16,000 and you sell within six years of completion. The scheme is managed by the Victorian Managed Insurance Authority.
Queensland: Home warranty insurance is managed by the Queensland Building and Construction Commission. Owner builders who sell within six years of completion must hold cover.
Western Australia: Home indemnity insurance applies to owner builders who sell within six years. The threshold and conditions differ slightly from eastern states.
South Australia, Tasmania, ACT, NT: Each has its own rules and thresholds, and some territories have narrower exemptions for owner builders than others.
The consistent thread across all states is that selling within a defined post-completion window triggers warranty obligations. If you are building with any intention to sell, check the rules in your state before you start — not after.
Pre-Build Insurance Checklist by Stage
Before You Apply for a Permit
- Confirm your state's owner builder permit threshold and whether your project requires one
- Check whether your lender requires evidence of contract works and public liability before drawdown
- Confirm whether your council or certifier requires insurance certificates before issuing a development approval
- Gather quotes for contract works and public liability so you can satisfy these requirements promptly
Before Work Starts on Site
- Contract works policy in place, with sum insured matching full replacement cost
- Public liability policy in place, minimum $20 million
- Personal accident cover confirmed if you will be working on site yourself
- Workers compensation confirmed if any direct employees are engaged
- Subcontractor verification process in place (see below)
During the Build
- Collect a current certificate of currency from every subcontractor before they start work
- Confirm each subcontractor's public liability limit is adequate for the scope of their work
- Notify your insurer if the scope of work changes materially, the build timeline extends significantly, or the sum insured needs to increase
- Keep a site diary — in the event of a claim, documentation of what happened and when is often the difference between a settled claim and a disputed one
At Practical Completion
- Notify your contract works insurer that the build is complete
- Transition the property to a standard home and contents policy immediately
- Confirm whether home warranty insurance is required based on your sale intentions
- Retain all certificates of insurance, permits, and inspection records for at least the duration of any warranty period
Subcontractor Insurance: The Gap Most Owner Builders Miss
When a subcontractor works on your site, their insurance is your first line of defence for anything they cause. But a certificate of currency is only useful if it is current and if the policy actually covers the work being done.
Before each subcontractor starts, ask for:
- A current certificate of currency for public liability
- Confirmation that the policy covers the specific trade and the specific scope
- Evidence of workers compensation if they have employees of their own
If a subcontractor cannot provide these, the risk reverts to you. As the builder of record, you are the party a claimant will pursue if the subcontractor is uninsured or underinsured.
What Happens When Policies Overlap
Owner builder projects often involve multiple active policies at the same time. Contract works, public liability, and subcontractor policies can all respond to the same incident — and when that happens, insurers apply contribution clauses to determine who pays what proportion.
The practical consequence is that you should never assume one policy picks up what another excludes. Read the exclusions in each policy carefully, and if you are unsure how they interact, work through the scenarios with a broker before the build starts rather than at claim time.
Handover: Transitioning Back to Standard Home Insurance
One of the most common post-build mistakes is leaving a property on a contract works policy after completion. Contract works policies are designed for properties under construction — once the build is finished, the risk profile changes, and the policy may not respond correctly to a claim.
At practical completion, arrange a standard home building policy to start on the same day the contract works policy ends. Do not leave a gap. Even a single day without cover can create problems if something happens during the transition.
If you are moving into the property, add contents cover at the same time. If the property will sit vacant while you arrange a sale or tenancy, make sure the home building policy covers vacancy — many standard policies restrict cover for properties unoccupied beyond a defined period.
How a Broker Helps With Owner Builder Insurance
The policies involved in an owner builder project are more complex than a standard home insurance purchase. Each has different triggers, different exclusions, and different sum insured requirements. Coordinating them so there are no gaps — and no unnecessary overlaps — takes real familiarity with how construction insurance works.
ABS Insurance Brokers works with builders and construction clients across Australia, sourcing cover through the Steadfast Network to access a wide range of insurers. If you are preparing for an owner builder project and want to make sure your checklist is complete before work starts, you can request a quote or speak with a broker directly at ABS Insurance Brokers.
FAQs
Is owner builder insurance one policy or several?
It is several. The core covers are contract works (builders risk), public liability, and home warranty insurance. Personal accident and workers compensation may also apply depending on your situation. Each covers a different type of risk, and they need to be in place at different stages of the project.
Is home warranty insurance always required for owner builders?
Not always — but if you sell within a defined period after completion, it is mandatory in most Australian states. The window varies by state, but six years is the most common threshold for structural defects. Check the rules in your state before you start the build.
When should I buy contract works insurance?
Before any work begins on site. Some lenders and councils require evidence of cover before they will approve drawdowns or issue permits, so arranging this early avoids delays.
Do I need to check my subcontractors' insurance?
Yes. As the owner builder and builder of record, you carry the liability if a subcontractor causes damage or injury and is uninsured. Ask for a current certificate of currency from every subcontractor before they start, and confirm the policy covers their specific scope of work.
What happens to my insurance when the build is finished?
Your contract works policy should end at practical completion, and a standard home building policy should start on the same day. Do not leave a gap between the two. If you intend to sell, also confirm whether home warranty insurance is required.
How much does owner builder insurance cost?
It depends on the build value, your state, and whether you plan to sell. Draftee's 2026 data puts a total owner builder insurance package for a granny flat at between $5,000 and $12,000, with home warranty insurance alone ranging from $2,000 to $8,000. A broker can give you a more accurate figure based on your specific project.
What is the minimum public liability cover I should carry?
Built Simple's 2026 builder insurance guide puts the practical floor at $20 million. Some lenders and councils specify a minimum as a condition of their approval, so check those requirements early.
Before You Break Ground
Owner builder insurance is not a box to tick once and forget. It is a set of policies that need to be in place at the right time, with the right limits, and coordinated so they work together rather than leaving gaps.
Work through the checklist above at each stage of your project. Keep your subcontractor certificates current. Notify your insurer when the scope or timeline changes. And when the build is done, transition to standard home cover on the same day the construction policy ends.
If you want a broker to work through the specifics with you, ABS Insurance Brokers can help you identify the right combination of covers before work starts.
