New Zealand's building regulations place specific obligations on commercial building owners when it comes to earthquake safety. Understanding the framework — and where gas system protection fits within it — is increasingly important as the regulatory landscape continues to evolve.

The Earthquake-Prone Building System

The Building Act 2004, as amended in 2016, established a national system for identifying and managing earthquake-prone buildings (EPBs). The key measure is the %NBS rating — the percentage of the New Building Standard a building achieves. Buildings that fall below 34% NBS may be classified as earthquake-prone by their territorial authority, triggering legal requirements to remediate or demolish within set timeframes.

Higher thresholds matter in practice too. Many commercial leases include provisions tied to 67% NBS, giving tenants the right to terminate if a building falls below that level. Corporate tenants — including government agencies and multinationals — often have internal policies requiring minimum seismic performance ratings before signing a lease.

This is changing. In September 2025, the New Zealand Government proposed a major reform of the EPB system, replacing the %NBS metric with a more risk-based approach focused on higher-seismic-risk areas and higher-risk building types. The Building (Earthquake-prone Building System Reform) Amendment Bill is expected to pass in 2026. Building owners and managers should monitor these changes closely.

Engineering Systems: NZS 4219

Structural compliance is only part of the picture. NZS 4219:2009 — Seismic Performance of Engineering Systems in Buildings governs the mechanical, electrical, and plumbing systems inside buildings — including gas pipework.

Under NZS 4219, gas pipework must be designed and installed with seismic restraints appropriate to the building's risk category. The standard applies to both new installations and retrofits, and is referenced directly by AS/NZS 5601.1:2022 — the gas installations standard that governs all new gas work in New Zealand.

This means compliance isn't just about the building's structure. The gas system inside it must also be designed to perform under earthquake loading.

Gas Safety and Secondary Risk

Structural compliance does not address what happens if an earthquake damages a gas pipe that meets all the relevant design standards. Pipes can be properly restrained and still rupture at joints, entry points, or fittings when a building experiences strong ground motion.

This is the gap that automatic seismic isolation addresses. The Gas (Safety and Measurement) Regulations 2010, overseen by WorkSafe New Zealand, require that gas installations do not create hazard under foreseeable conditions — and an earthquake is a foreseeable condition in New Zealand.

Installing an automatic shutoff system at the building's gas entry point is an increasingly common way for building owners and facilities managers to demonstrate that foreseeable earthquake risk has been addressed, both for regulatory purposes and for insurers.

What This Means in Practice

For commercial building owners, the obligations are layered:

• Structural: meet the EPB system requirements for your building type and location
• Engineering systems: comply with NZS 4219 for gas pipework seismic restraint
• Gas safety: meet the requirements of the Gas (Safety and Measurement) Regulations 2010
• Risk management: consider automatic isolation as a defence against secondary gas hazard

The regulatory framework tells you what the building must withstand. It doesn't guarantee the gas system won't fail. Automatic isolation is the practical layer that closes that gap.

See the MK6 Earthquake Trigger Recorder → or contact us to discuss requirements for your building.