New Zealand's Most Experienced Geohazard Team
In-house engineers. Purpose-built equipment. Rapid deployment. A design/build team that delivers where others can't.
Geoengineered Resilience
Engineering solutions to geotechnical problems that last.
GeoStabilization New Zealand Ltd is a specialist geohazard, ground engineering, and contamination solutions firm operating across New Zealand, Australasia, and the South Pacific. For nearly three decades, GSI has designed, built, and delivered engineered solutions to slope failures, soft ground conditions, contamination issues, and geotechnical risk — faster and more permanently than any traditional contractor.
GSI expanded into New Zealand in 2017 following unprecedented demand after the Kaikoura earthquake, and strengthened its ground engineering capability through the 2019 acquisition of Hiway Geotechnical. Today, our New Zealand operation combines global technical depth — built across thousands of completed projects originating in North America — with direct knowledge of the distinctive geology of these islands. From Northland to Fiordland, when a slope fails or ground shifts, we are the team that gets called first.
How We Got Here
GSI Founded — North America
GeoStabilization International was established to solve geohazard and slope stabilisation challenges for highways, railroads, and utilities across North America. The founding model — in-house engineering design and construction under one contract — is the same model we operate today.
Arrived in New Zealand
Following the Kaikoura earthquake, GSI New Zealand was called in to respond to slope failure and rockfall damage across the South Island highway network. The scale of demand led to the establishment of a permanent New Zealand operation — one that has grown continuously since.
Acquired Hiway Geotechnical
The acquisition of Auckland-based Hiway Geotechnical brought deep ground engineering capability — CFA piling, jet grouting, mass stabilisation, and in-situ trench mixing — under the GSI roof. Our offering expanded from geohazard response to comprehensive ground engineering across New Zealand and the South Pacific.
Expanded NZ Capacity
Continued investment in specialist plant, crew capability, and technical staff to meet growing demand from NZ Transport Agency Waka Kotahi, local authorities, and private clients. GSI is today the most capable integrated geohazard and ground engineering team operating in New Zealand.
One Team. One Contract.
Most firms separate design and construction. GSI doesn't. Our in-house geotechnical engineers and geologists design every solution, and our own field crews build it. That means the people who engineer your solution are the same people on the hill when the drill goes in.
The benefit to you: no gaps between designer intent and contractor execution, no finger-pointing when conditions vary, and a constructible design from day one. One contract, one point of accountability, and faster delivery — because we don't wait for someone else to approve a design change before we act.
Breadth No Other NZ Firm Matches
Our capabilities span four specialist divisions — Geohazard Engineering, Ground Engineering, Ground Stabilisation, and Residential — covering everything from emergency slope response to specialist grouting and urban ground improvement. We own the equipment and train the crews in-house, which means we're not limited by what a sub-contractor can supply.
- ›Slope stabilisation & landslide remediation
- ›Rockfall mitigation & protection systems
- ›IRATA rope access for difficult and remote sites
- ›CFA piling & in-situ trench mixing
- ›Deep soil mixing, jet grouting & mass stabilisation
- ›Polyurethane & foamed concrete grouting
- ›Emergency response — 24/7, nationwide
Safety That Comes First, Not Last
Our work happens in some of the most hazardous environments in New Zealand → unstable slopes, active rockfall zones, remote sites with no infrastructure. Our safety programme isn't a compliance exercise. It's the reason our crews go home every day.
We hire experienced, skilled people and invest in keeping them — through rigorous IRATA rope access training and site-specific hazard management plans on every job. Your project stays safe because our safety standard is built into the way we work — not bolted on as an afterthought.
Why Clients Choose GeoStabilization New Zealand Ltd
Best Value
We engineer the most cost-effective solution for the actual conditions — not the cheapest bid that creates problems later. Our design/build model eliminates scope gaps that drive cost overruns.
Speed & Certainty
When a slope fails, we mobilise fast. Our equipment and crews are ready to deploy nationwide within hours, not weeks — because slope failure doesn't wait for procurement processes.
Technical Depth
Every solution is fully engineered by our in-house team. You deal with one firm, one point of accountability, and engineers who understand both the geology and the construction.
Difficult Access
IRATA-certified rope access crews and purpose-built equipment reach sites where standard plant can't go — no access road, no problem. That access capability changes what's possible.
Breadth of Solutions
From emergency slope response to specialist grouting and urban ground improvement — we hold more specialist geotechnical capabilities in-house than any other firm in New Zealand.
Track Record
Over 10,000 completed projects across Australasia and North America. When you engage GSI, you engage a team that has solved problems like yours before.
Standards & Affiliations
GSI operates to internationally recognised standards and maintains active membership in the bodies that shape geotechnical practice in New Zealand.
IRATA International
All GSI rope access technicians are certified to IRATA (Industrial Rope Access Trade Association) standards — the globally recognised benchmark for safe industrial rope access operations. Our IRATA-certified crews carry out work at height and in difficult terrain that is inaccessible to conventional plant.
NZ Geotechnical Society
GSI engineers are active members of the New Zealand Geotechnical Society — the professional body representing geotechnical engineers and engineering geologists in New Zealand. NZGS membership reflects our commitment to contributing to and maintaining the standard of geotechnical practice across the country.
NZ Transport Agency Waka Kotahi Pre-Qualified Supplier
GSI holds pre-qualified supplier status with NZ Transport Agency Waka Kotahi for geotechnical and slope works. Pre-qualification enables rapid engagement on State Highway emergency and planned works contracts — cutting procurement delays when roads are closed and pressure to reopen is high.
GNS Science
GSI collaborates with GNS Science on geohazard risk research and assessment — drawing on New Zealand's leading earth science research institution. That relationship keeps our engineering approaches informed by the latest understanding of New Zealand's distinctive geology and geohazard environment.
KiwiRail — Pre-Qualified Physical Works Contractor
GSI holds pre-qualified physical works contractor status with KiwiRail, enabling direct engagement on rail corridor geohazard and ground engineering projects. Pre-qualification demonstrates that GSI meets KiwiRail's safety, quality, and technical requirements for working on the national rail network.
Totika — Health & Safety Prequalification
GSI is Totika accredited through Qualify365 — New Zealand's cross-industry health and safety prequalification scheme. Totika accreditation confirms that GSI's health and safety management system meets the standards required by major infrastructure clients, including NZ Transport Agency Waka Kotahi, KiwiRail, and local authorities.
Get in Touch
Work With NZ's Most
Experienced Team.
Over 10,000 completed projects across Australasia and North America. The best way to understand what GSI brings to your project is to talk directly with one of our engineers.
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