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Head Office and Laboratory: Dandenong
Western Victorian Facility: Ravenhall
Queensland Laboratory: Sunshine Coast

Who we are

Chadwick Geotechnics is a leading supplier of testing, drilling and engineering services to the Geotechnical, Civil and Environmental Engineering disciplines across the Eastern seaboard, New Zealand and the Asia Pacific Region.

We specialise in site investigations, geotechnical design, environmental assessments, and ground engineering solutions, as well as offering a comprehensive range of instrumentation and monitoring services. Our clients come from a diverse range of sectors, including construction, infrastructure, mining, energy, and government.

We are committed to delivering cost-effective, innovative, and sustainable solutions that ensure project success.

Our NATA accredited specialist testing laboratories are located in Dandenong (Victoria), Ravenhall (Victoria), and Birtinya (Queensland).

We are part of the Tonkin + Taylor Group of companies, a 100% employee-owned and operated international conglomerate of environmental and engineering consultancies and testing businesses.

Contact us today to learn more about our services and how we can help you achieve your goals.

Get in touch with our team
The Chadwick Geotechnics fleet, including drilling rigs

Our History

Chadwick Geotechnics was originally founded in 1996 by Tim Chadwick, a leader with over 30 years of experience in the management and provision of a broad range of services to the environmental and geotechnical engineering sectors. The company initially operated as T J Chadwick Geotechnical Pty Ltd, but changed its name to Chadwick Group Holdings Pty Ltd in 2001.


Chadwick Group Holdings Pty Ltd was acquired by Tonkin + Taylor Group, a leading environmental and engineering consultancy.


Our Western Melbourne testing facility opened in Ravenhall. The laboratory is NATA accredited for a multitude of specialist soil tests.


Our operations were restructured to become Chadwick Geotechnics Pty Ltd and Tonkin + Taylor Pty Ltd


Our first interstate facility was opened on the Sunshine Coast in Queensland, including a NATA accredited laboratory

Our Affiliations

Chadwick Geotechnics is proud to be associated with only the most respected and renowned organisations in the industry, including:

We are proud to announce the launch of our first Reconciliation Action Plan

We acknowledge Aboriginal and Torres Strait Islander peoples as the Traditional Owners and Custodians of this land and the places on which we live and work.