A sensible fix with one moving part
For decades New Zealand’s joint and several liability regime has left councils holding the bag whenever a builder went under and a defect surfaced. The Building Amendment Bill shifts that to proportionate liability, where each party answers only for its own share, and plugs the resulting gap by making warranties mandatory for all new residential buildings of three storeys and under and for renovations costing $100,000 or more that involve restricted building work.
The minimum cover is a one-year defects period and a 10-year structural warranty. It is a coherent piece of policy. But it rests entirely on a market that, right now, barely exists.
The voluntary system already failed
The case for action is hard to argue with. Only 46% of new builds currently carry a defects warranty, and renovation uptake is lower still. MBIE puts the average cost of latent defects across new builds in 2025 at about $23,000 per house. When a builder liquidates, that bill currently lands on a council or a homeowner with no recourse.
The Cabinet paper was blunt that voluntary cover leaves people “exposed to financial hardship without recourse.” Against that, the price of a warranty looks modest: between $1,200 and $2,750 on a $500,000 build, or roughly 0.3% to 0.6% of the total build cost. Manageable. But only if competition keeps it there.
A two-provider market backed by one syndicate
Here is the fragility. As of late 2025, builders warranty insurance in New Zealand was sold by just two providers, both backed by a single Lloyd’s of London syndicate. The Insurance Council warned the ministry it “should not be assumed that Lloyd’s will be able to provide further capacity in the future, or even to maintain the current level.” That is not theoretical. Lloyd’s has already exited and re-entered the New Zealand market once.
The reasons offshore insurers stay away are well known. A 2018 MBIE analysis found private insurers reluctant to enter because of the small market, the difficulty of pricing risk without claims data, and the long-tail nature of cover, with annual costs of warranty-relevant building problems estimated at around $85 million. Too small, too uncertain.
The mandate is already pulling capital in
This is where the news turns genuinely positive. A compulsory market is a guaranteed market, and that changes the maths. The NZ Herald reports that insurers and warranty providers are now actively eyeing entry into New Zealand precisely because the mandate creates defined, guaranteed demand. The policy is doing what it was designed to do before it has even passed.
Building and Construction Minister Chris Penk earlier called it “a chicken and egg situation, as everyone needed the comfort and certainty before they were willing to step up.” The mandate supplies the certainty.
The escape hatch that undercuts the promise
The catch is the suspension clause. Cabinet gave itself the power to suspend the mandatory requirement if cover is not widely available or affordable, for up to two years and extendable for another two. A potential four-year window with no mandatory cover, while proportionate liability still applies. If a builder fails in that gap, the homeowner can be left carrying the loss, which is the precise outcome the reform claims to prevent.
What builders should do now
The industry is split. Master Builders backs the framework but insists every provider, new or existing, meets identical solvency standards to avoid “the problem of the empty chair.” Treasury preferred an opt-out model, warning of higher costs and reduced supply, and was overruled. BusinessDesk found the wider sector divided over cost and capacity.
For builders and developers the practical line is clear. Price the warranty in now, because 0.3% to 0.6% is real money on every quote. Watch the entrants closely, because whether premiums sit at the bottom or top of that range depends entirely on how many insurers actually write cover. The reform’s design is sound. Its credibility rests on competition arriving, and on the Government resisting the temptation to pull the escape hatch if it does not.
Sources
- Insurers eye entry into New Zealand, as home building warranties/insurance due to become mandatory (2026-06-28)
- New ‘home warranty’ rules protecting homeowners announced (2025-11)
- Home owners could be left exposed as Govt gives itself an out on requiring new-build warranties (2025-12)
- Warranties and professional indemnity insurance to become compulsory under new building regime (2025-11)
- Construction industry divided over move to compulsory builders’ warranties (2026-05-14)
- Treasury warns new home warranty rules could hurt housing supply (2025-12-17)
- Councils, builders pleased with liability changes, but insurers warn of challenges
- Master Builders – Home Warranty Provider Registration Submission (2026-04)