If you build or renovate, contract works insurance is the cover that protects the job itself while it's under construction. A storm, fire, flood or theft on a half-finished site can wipe out weeks of work and materials - and without contract works cover, that loss usually lands on whoever's contracted to insure it. Here's how contract works insurance NZ builders and tradies use actually works, and how it fits with builders insurance and public liability insurance.
This guide is general information for NZ trade businesses, not financial or insurance advice. Cover, limits and exclusions vary between insurers - always read the policy wording and consider talking to a licensed insurance broker or financial adviser before you buy.
What contract works insurance covers
Contract works (sometimes called "construction works" or "builders risk") covers physical loss or damage to the work you're building, typically including:
- The structure under construction, up to practical completion
- Building materials on site (and often in transit or storage)
- In a renovation, frequently the existing structure you're working on as well
- Events like fire, storm, flood, accidental damage, theft and vandalism
It's about the thing being built, which is what sets it apart from public liability (damage to other people's property) and tools of trade (your equipment).
Who pays for it - and why the contract matters
On most building jobs, the contract spells out who must arrange contract works cover - sometimes the builder, sometimes the homeowner or principal. Standard building contracts used in New Zealand usually include an insurance clause, so read it before you start: if you're the one named, the risk is yours until the job is insured. Getting this wrong is a common and expensive mistake on residential builds.
New build vs renovation
- New builds are relatively straightforward - you're insuring a structure from the ground up to completion.
- Renovations and alterations are trickier because the existing home is at risk too. Make sure the policy covers the existing structure, not just the new work, or a fire during the job could leave a huge uninsured gap.
How long the cover runs
Contract works cover usually runs from the start of work to practical completion or handover, sometimes with a maintenance/defects period after. Match the policy period to your build programme so there's no gap at either end.
How to get the right cover (and a fair price)
Insurance is easy to over- or under-buy. A few practical steps:
- Get two or three quotes. Premiums and exclusions vary a lot between insurers for the same trade. Compare like-for-like cover, not just price.
- Use a broker for anything complex. A licensed insurance broker can match cover to your trade and contracts - useful once you're running jobs with contract works or higher liability limits. Brokers are usually paid by the insurer, not you.
- Read the exclusions and the excess. The exclusions decide whether a claim actually pays out. Check the excess (what you pay per claim) and any per-item limits.
- Match cover to your contracts. If a main contractor, council or commercial client requires a specific limit (often $1m-$5m public liability), your policy has to meet it before you can start.
For builders, contract works is usually one part of a wider package - see builders insurance NZ.
Frequently asked questions
Who is responsible for contract works insurance - the builder or the homeowner?
Whoever the building contract says. Many standard NZ contracts put it on the builder, but not all - always check the insurance clause before work starts.
Does contract works insurance cover a renovation to an existing house?
It can, but you must ensure the policy specifically covers the existing structure, not only the new work. Confirm this in writing.
When does contract works cover end?
Typically at practical completion or handover, sometimes extending through a defects/maintenance period. Align it with your build timeline.
Is contract works the same as home insurance?
No. The homeowner's standard house policy often won't cover a property under major construction - that's exactly the gap contract works fills during the build.
Sources
- business.govt.nz - business insurance
- Insurance Council of New Zealand (ICNZ)
- Consumer NZ - insurance
- WorkSafe NZ - Health and Safety at Work Act 2015
- ACC - cover for businesses
Update log
- 24 June 2026 - Published. General information reviewed against New Zealand industry and government sources (see Sources above).
Last reviewed: 24 June 2026.