Why Insurance Matters for Owner-Builders
As an owner-builder, you take on the same risks as a licensed builder — but without the corporate safety net. A single uninsured incident can cost you your entire build budget, your existing home, or expose you to personal liability claims worth hundreds of thousands.
This checklist covers the 5 insurance types every Australian owner-builder should have. Some are legally required (varies by state), others are practically essential. For each type, we explain what it covers, what it costs, and what to look out for.
1. Home Warranty Insurance
Home warranty insurance (also called home building compensation or domestic building insurance) protects future owners against structural defects for 6 years after completion. It kicks in when the builder (you) can no longer fix defects — due to death, disappearance, or insolvency.
| Detail | Information |
|---|---|
| Also known as | Home Building Compensation Fund (NSW), Domestic Building Insurance (VIC), Home Warranty Insurance (QLD) |
| Coverage period | 6 years for structural defects, 2 years for non-structural |
| Typical cost | $2,000-$8,000 (based on build value) |
| Who provides it | State government bodies or approved insurers |
| When to get it | Before construction commences — legally required in most states |
2. Contract Works Insurance
Contract works insurance (also called construction all-risks or builders risk insurance) covers physical loss or damage to the building work during construction. This includes fire, storm, vandalism, theft of materials, accidental damage, and water damage.
| Detail | Information |
|---|---|
| What it covers | The building under construction, materials on-site, temporary works |
| What it doesn't cover | Your existing home (separate policy), tools owned by trades, faulty design |
| Typical cost | $1,500-$4,000 for a $400K-$800K build |
| When to get it | Before construction starts — cover from day 1 |
| Duration | From construction start to practical completion + defects liability period |
3. Public Liability Insurance
Public liability insurance covers you if someone is injured on your building site or if your building work damages neighbouring property. Without it, you are personally liable for all claims — and construction injuries can result in claims worth $500K+.
| Detail | Information |
|---|---|
| Minimum recommended cover | $10 million (some councils require $20 million) |
| What it covers | Injury to visitors, delivery drivers, neighbours; damage to neighbouring property |
| What it doesn't cover | Injury to workers (that is workers comp), damage to your own property |
| Typical cost | $800-$2,500 per year for $10M-$20M cover |
| Who needs it | Every owner-builder — this is non-negotiable |
4. Workers Compensation
If you hire any workers directly (not through a licensed contractor), you are legally required to have workers compensation insurance in every Australian state. This covers medical expenses, lost wages, and rehabilitation if a worker is injured on your site.
| Detail | Information |
|---|---|
| When it is required | When you employ ANY workers directly (including labourers, cleaners) |
| When it is NOT required | When all work is done by licensed contractors with their own insurance |
| Typical cost | Varies by state and worker classification — 3-10% of wages |
| Penalty for non-compliance | Heavy fines ($50K+) and personal liability for ALL injury costs |
| Where to get it | Your state workers comp authority (icare NSW, WorkSafe VIC, WorkCover QLD) |
5. Home & Contents Insurance
If you are living in an existing home on the property during construction (common with knockdown rebuilds or additions), your standard home insurance may NOT cover construction-related damage. Many policies exclude or limit cover when building work is occurring on the property.
| Detail | Information |
|---|---|
| Risk | Your existing policy may be voided if you do not disclose construction activity |
| What to do | Notify your insurer BEFORE construction starts |
| Common exclusion | Damage caused by or related to construction activity |
| Typical cost increase | $200-$500 additional premium during construction period |
| Duration | From demolition/construction start to practical completion |
State-by-State Requirements
Insurance requirements for owner-builders vary significantly between states. This table summarises the key differences.
| State | Home Warranty Required? | Threshold | Public Liability | Workers Comp |
|---|---|---|---|---|
| NSW | Yes (above $20K) | $20,000+ | Required for permit | Required if employing workers |
| VIC | Yes (above $16K) | $16,000+ | Recommended | Required if employing workers |
| QLD | Yes (QBCC levy) | All builds | Required for permit | Required if employing workers |
| SA | Yes (above $12K) | $12,000+ | Required for permit | Required if employing workers |
| WA | Yes (above $20K) | $20,000+ | Required for permit | Required if employing workers |
| TAS | Contact Director of Building Control | Varies | Recommended | Required if employing workers |
| ACT | Yes | All residential | Required for permit | Required if employing workers |
| NT | Contact Building Advisory Services | Varies | Recommended | Required if employing workers |
Before You Start — Complete Insurance Checklist
Use this final checklist to verify you have all necessary insurance in place before breaking ground.