Published: 2 March 2026
Building reforms: New compliance obligations for developers & design professionals
Major changes to New Zealand’s building system are coming in 2026–27, introducing new compliance duties and shifting how risk is shared across the sector.
Here’s what businesses need to know:
All new residential buildings up to three storeys and renovations over $100,000 are expected to carry a one year defects warranty and a 10-year structural warranty. These warranties typically cost about 0.3%–0.6% of build value, and providers will need to meet registration and solvency standards. Developers and builders should plan warranty costs and documentation into every eligible project, and banks and buyers may increasingly request proof of warranty before settlement.
Architects, engineers and others involved in building design are expected to be legally required to hold PI insurance, with new Building Act offences for non-compliance. Firms should review their PI limits, retroactive cover and project exposure, and expect tighter QA requirements and increased scrutiny from warranty providers.
The Government will replace the current joint and several liability model with proportionate liability, meaning each party is responsible only for their share of fault. A Building Amendment Bill is expected early 2026, with a 12-month transition once passed. This shifts greater accountability to developers, consultants and contractors and makes strong contract management and coordinated insurance programmes essential.
Licensed Building Practitioners are expected to face higher fines and longer suspension periods for poor practice. This reinforces the need for strong documentation, site supervision and quality controls.
Developers & Builders:
- Budget for warranties in project feasibility.
- Tighten contractor vetting and QA systems.
- Update contracts to reflect warranty obligations and the shift to proportionate liability.
Architects & Engineers:
- Review and optimise PI insurance limits and conditions.
- Strengthen design QA, documentation, product compliance evidence and version control.
These reforms are designed to improve consumer protection, increase accountability across the supply chain, and reduce bottlenecks in consenting. They also raise the bar for compliance. Businesses that prepare early - by updating contracts, insurance and QA - will be better positioned when the new rules take effect.
Your Rothbury broker can also support you through these changes, helping you understand upcoming insurance requirements, explaining how warranty and PI obligations interact with your broader insurance programme, and guiding you through insurer, financier and regulatory expectations.
This guide provides general information only and does not constitute financial or legal advice. Please consult your broker or professional advisor for guidance specific to your business.