Tonkin + Taylor
Tonkin + Taylor is a New Zealand employee-owned engineering and environmental consultancy serving infrastructure, development, water and environmental projects across the Asia-Pacific region.
Last updated August 31, 2026
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Overview
Tonkin + Taylor is an employee-owned engineering and environmental consultancy headquartered in Auckland, New Zealand. The firm works across civil engineering, environmental consulting, geotechnical engineering and water-resources engineering, supporting public and private-sector clients on infrastructure, land development, transport, waste, water and environmental projects. The business traces its technical origins to Geotechnics Ltd, a laboratory testing and engineering consultancy established by Ralph Tonkin in 1959. Professor Peter Taylor of the University of Auckland provided technical input during this early period. In 1961, Ralph Tonkin and Don Taylor formed the Tonkin + Taylor partnership, creating the organization that would become the present consultancy. The partnership undertook engineering work in New Zealand and Asia and expanded its regional presence, including the establishment of an office in Malaysia during the 1970s. In 1981, the partnership was reorganized as a limited liability company. It subsequently developed into an employee-owned professional-services business. Employee ownership is an important part of the firm’s organizational identity, distinguishing it from many large engineering consultancies controlled by external shareholders or public markets. Tonkin + Taylor’s work combines technical investigation, design, assessment and advisory services. Its civil-engineering activities can support major transport and infrastructure schemes, while its geotechnical specialists address ground conditions, foundations, slope stability, seismic effects, land damage and construction risks. Environmental and water-resources capabilities extend to contaminated land, waste facilities, water infrastructure, environmental assessment and related planning or regulatory matters. The firm has participated in major New Zealand infrastructure projects and has received industry recognition for work including the Waterview Connection, Newmarket Viaduct Replacement, Rosedale Wastewater Outfall Tunnel, Silverstream Landfill Development and post-earthquake land-damage assessment in Christchurch. These projects illustrate the breadth of its practice, from transportation and urban infrastructure to wastewater, landfill and natural-hazard or disaster-recovery work. Tonkin + Taylor’s principal base is in Auckland, with offices in Australia, Malaysia and the wider Asia-Pacific region. The available reference material does not identify a current chief executive, detailed ownership structure beyond employee ownership, revenue figures, or a corporate website. Accordingly, the brand is best characterized as an active, privately held professional-services consultancy with a New Zealand base and regional operations.
History
Tonkin + Taylor developed from Geotechnics Ltd, a laboratory testing and engineering consultancy founded in 1959 by Ralph Tonkin. The early business benefited from technical input by Peter Taylor, a professor at the University of Auckland. In 1961, Ralph Tonkin and Don Taylor established the Tonkin + Taylor partnership, which became the foundation of the later consultancy. During its partnership period, the firm worked on engineering projects in New Zealand and Asia. Its regional development included an office in Malaysia in the 1970s, marking an early expansion beyond its New Zealand base. The company’s work evolved across several related disciplines, including civil engineering, environmental services, geotechnical analysis and water-resources engineering. In 1981, the partnership was converted into a limited liability company. Over time, the organization grew into an employee-owned company rather than becoming a publicly listed engineering group. This ownership model remains a defining feature of the brand and its corporate structure. The firm’s project record includes substantial transportation, water, waste and environmental assignments. Its participation in the Newmarket Viaduct Replacement and Waterview Connection projects demonstrated its role in large transport infrastructure alliances. Work on the Rosedale Wastewater Outfall Tunnel and Silverstream Landfill Development reflected its capabilities in water and waste infrastructure. Following the Christchurch earthquakes, its land-damage assessment team contributed to the evaluation of affected properties and ground conditions. Industry awards associated with these projects include recognition from engineering, construction, infrastructure and professional bodies. The awards covered transportation infrastructure, wastewater, landfill development, concrete and infrastructure, and land-damage assessment. These distinctions helped establish Tonkin + Taylor as a significant New Zealand technical consultancy, although the available material does not provide a complete chronology of subsequent leadership, acquisitions, financial performance or office expansion. The company currently operates from Auckland with offices in Australia, Malaysia and the broader Asia-Pacific region. Its present service profile remains centered on civil, environmental, geotechnical and water-resources engineering for infrastructure and development clients.
- 2014
Waterview Connection recognition
[1]The Waterview Connection project received the Innovation in Roads Award at the Year in Infrastructure Conference as a Well Connected Alliance project.
- 2013
Newmarket Viaduct Replacement awards
[1]The Newmarket Viaduct Replacement Project received multiple awards spanning engineering, construction, transport infrastructure and concrete.
- 2012
Christchurch land-damage assessment recognized
[1]The Land Damage Assessment Team in Christchurch received an ACENZ Gold Award of Excellence.
- 2011
Recognition for wastewater and landfill projects
[1]Projects including the Rosedale Wastewater Outfall Tunnel and Silverstream Landfill Development received engineering and construction-industry recognition.
- 1981
Restructured as a limited liability company
[1]The partnership was reorganized into a limited liability company and later developed into an employee-owned consultancy.
- 1970
Regional expansion into Malaysia
[1]The firm established an office in Malaysia during the 1970s, expanding its presence beyond New Zealand.
- 1961
Tonkin + Taylor partnership formed
[1]Ralph Tonkin and Don Taylor formed the Tonkin + Taylor partnership, which undertook engineering work in New Zealand and Asia.
- 1959
Geotechnics Ltd established
[1]Ralph Tonkin founded Geotechnics Ltd as a laboratory testing and engineering consulting company, providing the business origins of Tonkin + Taylor.
Products and positioning
An employee-owned, technically led engineering and environmental consultancy focused on complex infrastructure, ground, water and environmental challenges in New Zealand and the Asia-Pacific region.
Engineering consultancy
Civil engineering
Civil engineering services for transport, urban development and other infrastructure projects. The practice can contribute planning, design, technical assessment and delivery support within complex project alliances and construction programs.
Environmental professional services
Environmental consulting
Environmental services addressing the interaction between infrastructure, land, water and regulatory requirements. The available material identifies environmental consulting as one of the firm’s core disciplines, but does not provide a detailed service catalogue.
Engineering consultancy
Geotechnical engineering
Investigation and engineering advice concerning ground conditions, foundations, slopes, land stability and construction risks. The discipline reflects the firm’s origins in laboratory testing and engineering consultancy.
Water engineering consultancy
Water-resources engineering
Engineering services for water and wastewater infrastructure and related resource-management challenges. Referenced project work includes the Rosedale Wastewater Outfall Tunnel, demonstrating application to major municipal water infrastructure.
Waste and environmental engineering
Landfill and waste infrastructure
Technical consultancy for landfill development and related environmental or civil works. The Silverstream Landfill Development is an identified example of this project capability.
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