Landslide & Slope Stabilisation

LANDSLIDE & SLOPE STABILISATION

New Zealand's geology, topography and rainfall make slope instability one of the country's most persistent and costly infrastructure challenges. From the deeply weathered hillsides of the East Coast to the steep greywacke terrain of the Southern Alps, landslides threaten state highways, rail corridors, urban developments and private properties every year. Cyclone Gabrielle alone triggered hundreds of significant slope failures across Hawke's Bay, Northland and the East Coast in 2023, closing critical road corridors for weeks and causing hundreds of millions of dollars in damage.

GeoStabilization New Zealand Ltd (GSI) is New Zealand's specialist landslide repair contractor. We design, build and warrant slope stabilisation solutions across the full spectrum of failure types — from shallow translational slips on fill embankments to deep-seated rotational failures in natural terrain. Our in-house geotechnical engineers assess every site and produce a fixed-scope, fixed-price proposal. The same team that analyses the failure is the team that designs and builds the repair. No handoffs. No sub-contractors. One point of accountability.

GSI operates a nationwide fleet of purpose-built limited-access drill rigs, enabling us to install ground reinforcement on slopes that would be inaccessible to conventional equipment. In genuine emergencies, we can have crews installing soil nails within 48 hours of being engaged — and road corridors reopened within days, not weeks. We have completed thousands of landslide repairs across New Zealand and Australasia, giving us unmatched experience in the geological conditions that drive slope failures here.

We work across transport infrastructure (NZTA, KiwiRail), local government, mining, commercial development and residential sectors. All designs are undertaken to NZS and Eurocode standards by our registered geotechnical and structural engineers.