Your Local Northland Geotechnical Experts
Soil & Rock Consultants opened our Northland office in 2017, serving Northland from Wellsford to Cape Reinga. We provide responsive, cost‑effective geotechnical engineering tailored to regional conditions.
Office Address
158a Bank Street
Regent
Whangarei 0112
Why Northland Chooses Us
Whether you're building a home in Whangarei, developing land near Dargaville, or starting a commercial project in Kerikeri—our local geotechnical engineers are here to help.
Soil & Rock Consultants offer a fast turnaround, accurate assessments, and deep regional knowledge.We’re not just based in Auckland—we’re proudly embedded in Northland too.
With a dedicated Whangarei office and Regional Manager Dave Ouwejan (CPEng) leading our team, we know the terrain, the soil profiles, and the council expectations.
Our Northland Team
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Our team have a deep understanding of Northland’s soil types, terrains, slope stability challenges.
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We are certified for ISO 45001 (Health & Safety), ISO 9001 (Quality Management) and ISO 14001 (Environmental Management). These certifications mean you can rely on us to work to the highest standards.
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Soil & Rock have been providing Geotechnical expertise in New Zealand for more than 3 decades. We have a proven track record and years of industry experience.
Technical Director (Geotechnical)
BE (Civil), CPEng, CMEngNZ (Geotechnical)
Senior Geotechnical Engineer
BSc, PMEG, PGCertEng, CMEngNZ, CPEng
Engineering Geologist
MEngNZ, BSc
Geotechnical Engineer
ME (Civil, Structural)
Geotechnical Field Technician
Our Northland Projects
Springs Flat, Whangarei – Roundabout
An $18M project to construct a new roundabout on State Highway 1 providing connection to Springs Flat and Kamo East. The project involves construction of a large box culvert, retaining wall and significant earthworks. S&RC has provided extensive geotechnical investigation, analysis of settlement, liquefaction and slope stability, and design of ground improvements and retaining structures. Construction is underway with geotechnical construction monitoring and continued technical support provided by S&RC.
North Park Drive, Kaitaia – Pile Driving
A 650m² multi-use building supported on >200 timber piles driven to 12m depth through alluvial soils. S&RC provided deep geotechnical investigation using machine borehole and CPTs to inform settlement and liquefaction analysis and geotechnical foundation design input. S&RC carried out vibration measurement during construction to monitor potential effects on neighbouring buildings and provided observation and QA review for pile driving and fill compaction.
Kent Road, Whangarei – Subdivision
A 16-Lot subdivision adjacent Whangarei Boys High School. The site is located at the edge of a basalt lava flow, with alluvial deposits and pre-existing fill present across lower lying areas. S&RC provided geotechnical investigation using hand augerholes, test pits, machine borehole and CPTs to inform settlement analysis, geotechnical foundation recommendations and design of timber pole and reinforced masonry block retaining walls up to 3m high. S&RC provided earthworks and retaining specification and monitored construction with Nuclear Densometer (NDM), clegg hammer, scala and shear vane testing.
Kamo Road, Whangarei – Medium Density Housing
A development providing seven new two-level dwellings within Central Kamo. The site straddles deposits of volcanic and alluvial soils which presented potential settlement and liquefaction challenges. S&RC provided analysis of hand augerhole and CPT investigation data to design shallow ground improvements, comprising geogrid reinforced gravel raft, avoiding the need for deep foundations and providing a cost-effective yet robust solution.
