We move 'mountains'
by optimising geotech, earlier.

let's talk

© McConnell Dowell Constructors Ltd

our expertise

We start each problem from first principles, assess what is to be built and study how the ground will respond.

value engineering / optimisation

tunnelling

ground improvement

slope engineering

deep basements / foundation

temporary works

about us

We approach every problem from First Principles to really understand the ground  and anticipate how it will respond to what is to be built.  That gives greater certainty. For us – and for our clients. Want to know more about Andy O’Sullivan?

Andy

Andy

Michael

Michael

Raymond

Raymond

Ain

Ain

Arman

Arman

Catherine

Catherine

Co

Co

Ohnmar

Ohnmar

Sofia

Sofia

Kurtis

Kurtis

James

James

Bede

Bede

Iris

Iris

meet the team →

projects

We go beyond for clients, we move mountains, we uncover secrets. Our team is proud of what we have achieved. Find out why here.

Auckland Central Interceptor

Auckland Central Interceptor

NZ’s largest water sector tunnelling project

read more »→

Ara Tūhono – Pūhoi To Warkworth

Ara Tūhono – Pūhoi To Warkworth

major motorway extension through complex geology

read more »→

St Marys Bay to Masefield Beach Water Quality Improvement

St Marys Bay to Masefield Beach Water Quality Improvement

challenging urban tunnelling project

read more »→

New Main Wharf North – Port Nelson

New Main Wharf North – Port Nelson

major upgrade to key regional port

read more »→

Redhills Wastewater Infrastructure Scheme

Redhills Wastewater Infrastructure Scheme

innovative underground pipe bridge design

read more »→

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 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

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

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

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