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 used cutting-edge software to design an ‘underground pipe bridge’ through a major landslide. To our knowledge, this solution has never been constructed before and saved over two years of project delays and millions of dollars.

Andy Corbett - Commercial Director, Pipeline & Civil Ltd

March Cato have enjoyed working with Andy O’Sullivan. We feel confident that we can pick up the phone at any time and get talking to a team who properly listen and take the time to understand the challenges we’re facing, so they can develop up a site specific, sensible and constructable solution to keep our jobs moving along safely.

Tony Mills - General Manager, March Cato

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 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 for a number of years now and we keep coming back to them as their approach to geotechnical design is always practical and efficient. They do not shy away from challenging designs and will always go that extra mile to make sure their designs are constructable.

Tim Pervan - Engineering Manager, Heron Construction

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