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

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

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

Andy O Sullivan had a great understanding of the contractors focus to provide a safe and efficient solution for the shaft works on the Saint Marys Bay Project. Their willingness to investigate change and be flexible during the construction phase allowed the project to realise opportunities and achieve a successful outcome.

Grant McLean - Senior Site Executive, McConnell Dowell

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

Andy has always made time to work with us, often without prior notice. His team listens to what we want to achieve, then works collaboratively to develop innovative and cost effective solutions.

Chris Osborne - Engineering Manager, Downer Group

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