Mainmark 2016

Mainmark provides a range of specialist ground engineering and asset preservation solutions for the residential, commercial, industrial, civil infrastructure and mining sectors and has 25 years of experience across Australia, New Zealand and the Asia Pacific region.

Mainmark has expertise in raising, re-levelling and re-supporting concrete slabs, pavements, bridge approaches, highways, railways, airports, sea ports, culverts on roads, buildings and many other structures. We strengthen and stabilise weak ground, fill holes and voids, decommission pipelines and culverts, and revitalise ageing concrete and steel infrastructure.


Rationale logo black background with tagline

Rationale improves New Zealand infrastructure outcomes through intelligent analysis and solutions.

We are recognised as leaders in delivering services that support great infrastructure decisions including business cases, strategy, policy, asset management, engineering, design and engagement.

With broad capability and deep experience, we specialise in addressing the big challenges that affect towns, regions, cities and the national landscape.

As a trusted partner to all sectors, we strive to create a better world through every engagement.


SouthRoads 2017SouthRoads is an Invercargill based company serving Otago, North Otago and Southland and privately owned by the H.W. Richardson Group. SouthRoads has an extensive history in urban and rural construction and maintenance of roads and bridges as well as commercial and industrial site construction within Otago and Southland.

SouthRoads is a dynamic contracting company with a reputation for excellent results that we will not compromise.  We are efficient and profitable operators that provide the right people with the right resources, to do the right job.  We make a decision to proceed with a project and get on and complete it.  We treat all others as we like to be treated.