Home building insurance is one of the most fundamental financial protections for any property owner in Australia. Yet many homeowners pay their premium every year without fully understanding what their policy actually covers — or doesn’t.
This guide breaks down home building insurance in plain language: what events are insured, common exclusions, how to set the right sum insured, and what separates a good policy from a cheap one.
What Home Building Insurance Covers
Home building insurance (also called home insurance or structure insurance) protects the physical structure of your residential property against damage caused by a range of defined events.
Most standard building policies in Australia cover:
Insured Events
Fire — Including bushfire damage. Note that some policies in high-risk bushfire zones have specific conditions or exclusions — review the PDS carefully if your property is in a BAL (bushfire attack level) rated area.
Storm and wind damage — Covers damage to the roof, walls, windows, and fences caused by high winds, hail, and storm events. One of the most frequently claimed events in Australia.
Flood — Coverage has expanded significantly since the 2022 Queensland and NSW floods, but the definition of “flood” still varies between insurers. Some policies distinguish between storm surge, flash flooding, and river flooding. Read your policy definition carefully.
Lightning strike — Direct lightning strikes to the structure and electrical damage caused by lightning.
Earthquake — Covered under most policies; Australia has seismic activity particularly in Victoria and Western Australia.
Theft and malicious damage — Attempted break-ins, vandalism, and deliberate damage (by parties other than tenants — for tenant damage, you need landlord insurance).
Impact — Damage from falling trees, vehicles, aircraft, or other external objects striking the property.
Escape of liquid — Burst pipes, leaking water systems, and overflow from appliances. Often sub-limited; check the policy for any cap on water damage claims.
Explosion — Gas explosions and similar sudden events.
What’s Usually Included in the Structure
- Walls, roof, floors, ceilings
- Fixed windows and doors
- Built-in kitchen cabinetry and benchtops
- Bathroom fixtures (toilets, baths, showers)
- Internal staircases and flooring
- Garages, carports, and garden sheds on the same title
- Fences and gates (check sub-limits)
- Driveways and paths (check if included)
- Swimming pools and spas (usually included; check for specific exclusions on equipment)
- Solar panels (increasingly standard to include, but verify)
What Home Building Insurance Does NOT Cover
This is where many claims get denied. Common exclusions:
Wear and Tear / Gradual Deterioration
No policy covers normal aging, gradual deterioration, or maintenance failures. If your roof tiles crack from 20 years of weathering, that’s maintenance — not an insured event. If a severe hailstorm cracks those same tiles, that’s covered.
This distinction causes frequent disputes. The key question is whether damage was caused by a sudden, defined event or by ongoing neglect.
Structural or Foundation Defects
Pre-existing structural problems, subsidence caused by poor construction, and building defects are excluded. If your slab cracks due to a soil issue that was present when you bought, building insurance won’t respond.
Tree Root Damage
Tree roots infiltrating drainage or damaging foundations are almost universally excluded. This is the responsibility of the property owner through maintenance.
Flooding in Some Policies
Despite expanded flood cover in recent years, always check your specific policy. Some older policies or budget products still exclude certain flood definitions. Properties in 1-in-100 year flood zones may face exclusions or high flood premiums.
Asbestos Removal
If storm damage to an older property exposes asbestos sheeting, most policies cover the reinstatement of the structure but exclude the cost of asbestos removal and disposal, which is substantial. Check whether your policy includes asbestos removal cover — it’s available as an add-on with some insurers.
Contents
- Setting the Right Sum Insured
- Comparing Policies: What Matters Beyond Price
- Do Lenders Require Building Insurance?
Setting the Right Sum Insured
The sum insured on a building policy is the maximum the insurer will pay to rebuild your property from the ground up. It is not the market value or the purchase price of your property.
Getting this figure right is one of the most important steps in the insurance process — and one of the most commonly mishandled.
What to Include in the Rebuild Cost
- Demolition and debris removal
- Professional fees (architect, structural engineer, council approvals)
- Construction of the dwelling at current costs
- All fixtures, fittings, and improvements
What you don’t include: the land value. You only insure the structure, not the dirt it sits on.
Current Rebuild Costs in Australia (2026)
Construction costs have risen sharply since 2022 due to supply chain pressures and labour shortages. Current per-square-metre estimates for residential construction vary by state and finish quality:
| Build quality | Approximate cost/sqm |
|---|---|
| Standard residential | $2,200–$3,000 |
| Medium quality | $3,000–$4,200 |
| High-end / custom | $4,500–$6,000+ |
A 200 sqm house of medium quality in Sydney could therefore have a rebuild cost of $600,000–$840,000 — significantly higher than a decade ago. Ensure your sum insured reflects current costs, not what you estimated when you first took out the policy.
Most insurers provide a free online rebuild cost calculator. For high-value properties or complex dwellings, a quantity surveyor report gives a more reliable figure.
Automatic Indexation
Most quality policies include automatic annual indexation of the sum insured in line with a building cost index. This helps prevent gradual underinsurance but doesn’t account for major renovation work you’ve done since the policy was taken out. Review manually after any significant improvement.
Comparing Policies: What Matters Beyond Price
1. Defined Events vs. Accidental Damage
A “defined events” policy only covers the risks explicitly listed in the PDS. An “accidental damage” policy adds broader coverage for unexpected events not specifically listed.
Accidental damage cover costs more but significantly reduces the chance of a denied claim. For owner-occupiers (not investors), it’s generally worth the additional premium.
2. New-for-Old vs. Indemnity Value
“New-for-old” reinstatement replaces damaged components with new equivalents. “Indemnity value” pays the depreciated value of what was damaged — meaning you receive less, based on the component’s age.
For a 20-year-old roof, indemnity value might pay a fraction of the actual replacement cost. Always check which basis your policy uses.
3. Temporary Accommodation
If your home is uninhabitable due to an insured event, most policies cover temporary accommodation costs. Check the limit (typically 12–24 months or a fixed dollar cap) — it matters most in major loss scenarios like fire or flood damage.
4. Excess Options
Choosing a higher excess lowers your annual premium. For a property with a rebuild value of $800,000, the premium difference between a $500 and a $2,500 excess might be $200–$400/year. Whether that trade-off is worth it depends on your cash flow and willingness to self-insure small claims.
Do Lenders Require Building Insurance?
Yes. All Australian home loan lenders require evidence of building insurance as a condition of settlement. You cannot drawdown a home loan without a current policy in place.
Lenders typically require:
- A certificate of currency showing the property address and sum insured
- The lender noted as an “interested party” on the policy
This isn’t just a formality — it protects both you and the bank’s security (the property) in the event of a catastrophic loss.
General information only. Not financial or insurance advice. Insurance products have specific terms, conditions, and exclusions which vary between providers. Always read the Product Disclosure Statement before purchasing.