Delivering high-quality, safe, and reliable, commercial and residential plumbing and drainage services for over 30 years.

Solutions at Scale

Grantham Group

Four Divisions.
One Trusted Name.

A person adjusting plumbing valves and gauges on a wall-mounted heating or water system in a utility room.

Trusted Plumbing, Drainage, and Hydro Solutions

Over 30 Years of Plumbing & Drainage Excellence

Grantham Group has delivered large-scale plumbing and drainage solutions across New Zealand for over 30 years.

With a team of 35+ experts and a reputation built on trust, safety, and performance, we are your partner of choice for complex commercial builds, high-end residential projects, and long-term maintenance contracts.

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Multi-division plumbing and drainage services backed by over three decades of proven experience.

Assorted metal pipes and fittings on a work surface, some with threaded ends and a circular metallic component with bolts.

Plumbing

A yellow excavator digging into the soil at a construction site during daylight, with bare trees and a partly cloudy sky in the background.

Drainage

Worker in white coat and gray gloves is using a pipe inspection camera on a pipe underground, with the camera display showing inside the pipe, on a gravel surface.

Hydro

Residential Homes | Apartments | Subdivisions | Medical | Retail | Warehousing | Food Outlets | Offices | Hotels | Schools | Community Buildings | Infrastructure | Agricultural | Food Processing | Property

Architectural rendering of Takanini Library building with black and wood exterior, large overhanging roof, vertical wooden poles, and landscaped area around it.

Takanini Library by Architect: Pacific Environments

Expertise Across Every Sector

From residential builds to complex commercial developments, Grantham Group delivers plumbing and drainage solutions built for purpose, performance, and longevity.

Our team works across new builds, refurbishments, and fitouts supporting architects, builders, and property owners with the same precision and care, no matter the scale.

Projects

Commercial Plumbing Across New Zealand

Grantham Group delivers commercial plumbing solutions for developers, builders, and main contractors throughout New Zealand. From hotels and apartment developments in Auckland to education, healthcare, retail, and hospitality projects across the country, our team provides reliable plumbing systems backed by experienced project delivery and proven results.

Working across Auckland, Waikato, Christchurch, Wellington, Queenstown, and beyond, we partner with project teams to deliver efficient, compliant, and future-ready plumbing solutions at every scale.

Check out our commercial plumbing projects.

Projects

Residential Plumbing Queenstown and Nationwide

Grantham Group provides residential plumbing services for homeowners, builders, and developers throughout Queenstown and across New Zealand. Whether it's a new home, renovation, townhouse development, or multi-unit residential project, our team delivers quality workmanship and dependable plumbing solutions tailored to your build.

From high-end homes in Queenstown to residential developments in Auckland, Waikato, and Christchurch, we bring more than 30 years of experience to every project, helping clients achieve successful outcomes from planning through to completion.

Check out our residential plumbing projects.

Projects

Auckland
Waikato
Christchurch
Queenstown,

With services across New Zealand we’ve got the team and the expertise to support your next project.

With teams operating across New Zealand, Grantham Group delivers commercial and residential plumbing solutions wherever they're needed. From large-scale developments in Auckland and Waikato to residential plumbing projects in Queenstown and Christchurch, we bring the same commitment to quality, reliability, and expert workmanship.