From 2 May 2026, new lead-free and dezincification-resistant (DZR) requirements apply when using G12/AS1 Amendment 14 to demonstrate compliance with the Building Code.

Already have a building consent?

If your building consent has already been granted, work can continue in accordance with the plans, specifications and conditions approved as part of that consent.

The approved documents must be followed for a Code Compliance Certificate to be issued.

Building consent applications from 2 May 2026

From 2 May 2026, G12/AS1 Amendment 14 is the applicable Acceptable Solution for Clause G12 Water Supplies.

If your application relies on G12/AS1 to demonstrate compliance, it must meet the requirements of Amendment 14.

Your application should include appropriate evidence that the proposed plumbing products comply, such as:

• building product specifications
• certification or test reports against recognised standards.

If the information provided is unclear or incomplete, we may need to request further information before we can assess compliance.

Compliance checklist

• Use lead-free copper alloy components for potable water systems.
• Ensure products under pressure are dezincification resistant.
• Avoid high-temperature brazing that reduces corrosion resistance.
• Confirm products are tested to:
• NSF/ANSI/CAN 372:2020 (lead-free)
• AS 2345:2006 (dezincification resistance).
• Verify IANZ-accredited test certificates or equivalent international certification (for example, WaterMark).

Work that does not require a building consent

Building work that does not require a building consent must still comply with the Building Code.

G12/AS1 Amendment 14 is one way of demonstrating compliance, but other compliance pathways may also be used.

Plumbers and building practitioners are responsible for ensuring that plumbing work, products and installation methods comply with the Building Code.

More information: MBIE guidance on lead-free plumbing requirements and transition arrangements for 2 May 2026