Do You Need Building Consent for Plumbing Work in NZ?

Plumbing in New Zealand is tightly regulated. All sanitary plumbing must be done by PGDB-registered plumbers, but whether you need a building consent on top of that depends on the type and scope of work. This guide explains when consent is and is not required.

The Key Distinction: Registration vs Consent

There are two separate regulatory requirements for plumbing work in NZ. First, all sanitary plumbing must be done by a plumber registered with the Plumbers, Gasfitters and Drainlayers Board (PGDB) — this is always required, regardless of consent. Second, a building consent from your local council may or may not be required depending on the nature of the work. Even exempt work must still comply with the Building Code.

When Consent Is Not Required

Under Schedule 1, building consent is generally not required for: minor plumbing repairs and maintenance (replacing taps, fixing leaks, replacing cistern components), like-for-like replacement of sanitary fixtures in the same location (replacing a toilet with a new toilet in the same spot), replacing a hot water cylinder in the same location with a similar unit, and replacing existing water pipes with the same size pipes on the same route.

When Consent Is Required

Building consent is typically required when: installing new sanitary fixtures where none existed before, relocating fixtures to new positions (which changes pipe routes), installing a new hot water system in a different location, making significant alterations to the plumbing system, adding new drainage connections, or changing from a gravity-fed to a mains-pressure hot water system. Essentially, any work that changes the layout of the plumbing system usually needs consent.

The Role of the Certifying Plumber

A certifying plumber is the highest level of PGDB registration. They can sign off that plumbing work is compliant with the Building Code and council requirements. For building consent work, the certifying plumber provides documentation to the council as part of the inspection and sign-off process. Using a certifying plumber gives you the strongest protection.

Hot Water Cylinder Rules

Replacing a hot water cylinder in the same location with a similar-capacity unit at the same pressure (mains or low pressure) is generally exempt from consent. However, changing the location, switching from low pressure to mains pressure, or installing a different type of system (e.g., continuous flow) typically requires consent. All hot water work must include installing a safe tray and appropriate valves.