our projects

Our team of specialists have experience in all major infrastructure sectors. We go beyond for our clients, and are proud of what we have achieved.
Find out why below!

Ara Tūhono – Pūhoi To Warkworth

major motorway extension through complex geology

Auckland Central Interceptor

NZ’s largest water sector tunnelling project

Auckland City Rail Link

largest transport infrastructure project in NZ

New Main Wharf North – Port Nelson

major upgrade to key regional port

Redhills Wastewater Infrastructure Scheme

innovative underground pipe bridge design

St Marys Bay to Masefield Beach Water Quality Improvement

challenging urban tunnelling project

We have worked with Andy and his team through the past two earthwork seasons on a number of challenges that have been encountered within our project. From stabilisation of large cut slopes in challenging ground. The solutions have been realistic, reasonable and constructable and a real ‘value add’ has been having some of our team regularly working out of Andy’s offices in true collaboration.

Phil Millership - Engineering Manager, Fletcher Acciona JV

The Andy O’Sullivan team developed the design for the temporary works as part of the Barber Grove ECI. This included several aspects of geotechnical design from retaining structures to specialist considerations associated with TBM works. The AOS team provided practical and progressive solutions in a demanding geotechnical environment and as a result, the well-considered designs bought real value to the project.

Daniel Crichton - Senior Principal Engineer, Downer Group

Andy O’Sullivan have provided Abergeldie innovative temporary works designs and geotechnical assessments reducing cost and programme on many of our construction projects.

Andy O’Sullivan are easy to work with and quick to respond to our requests.

Alastair Blackler - General Manager, Abergeldie Complex Infrastructure

Over the past two and a half years, Andy and his team have consistently delivered innovative and efficient design solutions to a wide range of complex, geotechnically related, challenges on the City Rail Link Project.

Nigel McCreight - Engineering Manager, Auckland City Rail Link, Link Alliance

Andy has been able to bring specific knowledge from previous projects in Auckland, therefore with Andy and his team, we were able to optimise some design elements. By involving Andy O’Sullivan in the early stages of the design they were able to add value to the project.

Francesco Saibene - Project Director, Ghella Abergeldie JV

A O'SULLIVAN & ASSOCIATES LTD | Geotechnical engineering | optimised earlier.