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

Solutions at Scale

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Grantham Group

Four Divisions.
One Trusted Name.

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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. 




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


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Auckland, Waikato, Christchurch and Queenstown,

With services across New Zealand, our experienced teams bring the skills, equipment, and project management expertise to support your next build on time, on budget, and to the highest standard.

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Plumbing: Auckland, Waikato, Christchurch, Queenstown
Hydro Services: Auckland, Waikato
Drainage: Auckland, Waikato


Our Valued Clients


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