Owner-Builder Insurance: What You Actually Need (And What's a Waste)
Insurance was the part of owner-building that almost made me walk away. Not because it's expensive (though it is), but because nobody could give me a straight answer about what we actually needed. Every broker, every forum, every government website — they all said something slightly different.
So I did what I always do: I spent two weeks researching it obsessively until I understood it properly. This is everything I learned, written for people who don't speak insurance jargon.
1. Home Warranty Insurance (Home Building Compensation Fund in NSW)
This is the big one. In most states, if your building work exceeds a certain threshold (it's $20,000 in NSW), you're legally required to have home warranty insurance. This protects future buyers if they discover defects after you sell.
Here's what confused me: as an owner-builder, you don't get to choose your provider. In NSW, it's managed by icare through the Home Building Compensation Fund. You apply through your private certifier, and the premium is based on the value of the work.
For our build (roughly $320,000 in construction value), the premium was around $6,500. That's not negotiable — it's a fixed percentage set by icare. It's due before your first inspection.
2. Contract Works Insurance (Construction All-Risks)
This covers physical damage to your build during construction — fire, storm, vandalism, theft of materials, accidental damage. It typically runs from the start of construction until practical completion.
We got ours through QBE for about $2,800 for the duration of our build. It covers the structure, materials on site, and temporary works (scaffolding, formwork). It does NOT cover tools, plant, or equipment belonging to your trades — that's their responsibility.
Is it worth it? Absolutely. One storm, one fire, one idiot driving into your temporary fencing — and you're looking at tens of thousands in damage with no insurance to cover it. This isn't the one to skip.
3. Public Liability Insurance
This covers you if someone is injured on your building site or if the building work causes damage to someone else's property. Think: a delivery driver trips on exposed rebar, or debris damages your neighbour's car (yes, we thought about our neighbour when getting this one).
Most policies offer $10-20 million in cover. We went with $20 million through a specialist construction insurer for about $1,200 for the build period. Your trades should have their own public liability insurance — always ask for a copy of their certificate of currency before they start work.
4. Workers Compensation
If you're engaging subcontractors (which as an owner-builder, you are), you generally don't need workers comp for them — they should carry their own. But if you have any employees (even casual labourers), you need workers compensation insurance. In NSW, this is managed by icare and the premiums are based on wages paid.
Alex and I don't employ anyone directly — all our trades are subcontractors with ABNs — so we don't carry workers comp. But we do verify that every subcontractor has their own cover. No certificate of currency? No work on our site. No exceptions.
5. Home and Contents Insurance (During Construction)
This one caught me off guard. If you're doing a knockdown rebuild like us, your existing home and contents policy becomes void the moment demolition starts. You're technically living in a different house (or not living there at all), and the property is now a construction site.
You can get a specialist "home under construction" policy that covers the existing structure (if any), the new structure during build, and your personal belongings if you're storing anything on site. We got ours bundled with the contract works insurance for about $800 extra.
What Insurance Do You NOT Need?
A few brokers tried to sell us additional policies that, after research, we decided weren't necessary for our situation:
Professional indemnity — this is for builders and architects, not owner-builders
Income protection specific to building — unless building IS your income, your standard IP policy covers you
Extended warranty insurance — separate from home warranty, and not legally required in any state
The Total Cost of Insurance for Our Build
| Insurance Type | Cost | Required? |
|---|---|---|
| Home Warranty (icare) | $6,500 | Yes (NSW) |
| Contract Works (QBE) | $2,800 | Strongly rec. |
| Public Liability ($20M) | $1,200 | Strongly rec. |
| Home Under Construction | $800 | Recommended |
| Workers Comp | $0 | N/A (subs only) |
| Total | $11,300 |
$11,300 is not nothing. But it's less than 4% of our total build cost, and it protects us against six-figure liabilities. Alex initially wanted to skip the contract works insurance ("it'll be fine, what could happen?"). I said no. This is one area where being the cautious one pays off.
Owner-builder costs, permit requirements, and insurance obligations differ across Australia. See the rules for your state:
Disclaimer: Some names, figures, timelines, and details in this article may have been changed, simplified, or fictionalised for illustrative and storytelling purposes. While based on real owner-builder experiences, individual scenarios, costs, and outcomes will vary depending on your location, build type, market conditions, and other factors. This content is general guidance only and should not be relied upon as professional financial, legal, or construction advice. Always consult qualified professionals before making decisions about your build.
Ashley Brennan is 25 and co-owns a knockdown rebuild in Lake Haven, NSW with her partner Alex. She handles the insurance, compliance, and budget oversight for their owner-builder project — and writes about the admin side of building that nobody talks about.