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The End of "Deep Pockets"?
What the New Building Bill Means for NZ Contractors
The Building Amendment Bill has been introduced to Parliament, bringing proportionate liability to the NZ construction sector. Learn what this means for contractors.
Team ConInnova
Introduction
For decades, the New Zealand construction sector has operated under a legal framework that many in the industry view as fundamentally unfair: joint and several liability. Under this system, if a building defect occurs and multiple parties are at fault, a plaintiff can pursue any single party for the entire cost of the damage, often targeting the 'last man standing' with the deepest pockets or the best insurance cover.
This is about to change.
On 29 June 2026, the Building Amendment Bill was introduced to Parliament, setting the stage for a paradigm shift in accountability for defective building work. The Bill's most significant change is a fundamental shift to proportionate liability, a move designed to address current inefficiencies that drive up costs, delay delivery, and constrain performance.
The proposed reforms aim to align liability with each party's share of responsibility in construction claims.
What the Bill Proposes: Proportionate Liability
Under the proposed proportionate liability regime, a party is only liable for the portion of the damage they actually caused. If a contractor is found to be 20% responsible for a defect, they only pay 20% of the damages, regardless of whether the other at-fault parties (such as designers, engineers, or the council) are insolvent or absent.
The Bill outlines several key parameters for how this will work in practice:
Provision | Detail |
Scope of Application | Applies where multiple parties contribute to defective building project work and a claim is pursued through litigation, adjudication, or arbitration. |
Single Apportionable Claim | Treats multiple causes of action arising from the same defective work as a single apportionable claim (e.g., claims in both contract and tort). |
Exclusions | Does not apply to disputes resolved by agreement, such as mediation or settlement. |
Implementation Timeline | Applies to building project work for which a building consent was issued on or after the first anniversary of Royal Assent. |
Protecting the Consumer: Mandatory Warranties and Insurance
A shift to proportionate liability transfers insolvency risk onto the consumer. A homeowner pursuing a defective building claim will need to join every contributing party to proceedings to recover their total loss, or face under-recovery if a liable party cannot meet its share of the loss.
To counteract this re-allocation of risk, the Bill introduces two significant consumer protection measures:
1. Mandatory Residential Home Warranties
The Bill introduces mandatory residential home warranties for residential building work with a total value of NZ$100,000 or more, provided the work includes restricted building work and requires a building consent. These warranties must provide minimum coverage of at least 1 year for building work that is defective, and 10 years for structural defects. However, legal experts have noted that the 1-year minimum for non-structural defects raises concerns about latent defects, such as weathertightness issues, which may not become apparent within that period. Furthermore, the proposed home warranty requirements apply only to new houses and small to medium-sized apartment buildings, leaving large apartment complexes outside the mandatory coverage.
2. Mandatory Professional Indemnity Insurance
The Bill also introduces mandatory professional indemnity (PI) insurance for design professionals who contribute, through advice or other services, to the design or compliance of building work.
What This Means for Civil and Commercial Contractors
While much of the current discussion focuses on residential building and Building Consent Authorities (BCAs), the shift to proportionate liability will have profound implications across the entire civil and commercial construction sector.
Contractual Risk Allocation | Parties will need to reconsider how risk is allocated and protected against in their contracts. Principal contractors can no longer rely on the fact that they (or their insurers) will simply cover the cost of a subcontractor's failure. |
Subcontractor Scrutiny | There will be a heightened focus on ensuring that every subcontractor in the supply chain is financially robust, adequately insured, and capable of standing behind their work. Pre-qualification processes will become more rigorous. |
Dispute Resolution | The change will influence how claims are brought, including decisions about which parties to join to proceedings. The risk of under-recovery where a liable party cannot meet its share of the loss will drive more strategic litigation decisions. |
Record Keeping | When liability is apportioned based on fault, the party with the best records wins. The ability to prove exactly what you did, when you did it, and who instructed you to do it will be critical in defending claims. |
Preparing for the New Era
The introduction of the Building Amendment Bill is a meaningful step in the right direction for a sector that has long carried a disproportionate share of risk. However, the detail that follows the introduction of the Bill (and associated regulations) will determine whether the reform achieves what it sets out to do.
Contractors must begin reviewing their commercial frameworks, subcontract agreements, and quality assurance processes now. When the music stops under a proportionate liability regime, you need to be absolutely certain of what you are, and aren't, responsible for.
At ConInnova, we help contractors build the robust commercial systems and accurate estimating frameworks required to navigate these regulatory shifts with confidence.
References
[1] Minter Ellison Rudd Watts. (2026, July 28). Building Amendment Bill: Proposed changes to liability for building work. https://minterellison.co.nz/insights/proportionate-liability-a-paradigm-shift-in-accountability-for-defective-building-work
