Geotechnical Investigations & Reports
We provide site-specific geotechnical investigations and reports to support residential building projects throughout Christchurch and Canterbury.
Many residential builds and renovations require a geotechnical report to satisfy council and building consent requirements. Canterbury ground conditions often vary significantly from site to site, meaning a standard solution is not always appropriate.
What Our Geotechnical Services Include
- Desktop study and site assessment
- Scala penetrometer and auger testing in accordance with NZS 3604
- Assessment of soil bearing capacity and settlement
- Liquefaction considerations where applicable
- Clear foundation recommendations suitable for consent
Who This Is For
This service is typically required for new homes, extensions, major renovations, and rebuilds. We work directly with homeowners and can coordinate with designers or builders as needed.
Frequently Asked Questions
Do I need a geotechnical report for my project?
Most new residential builds in Canterbury require a geotechnical report as part of the building consent process. Extensions, major renovations, and rebuilds on TC2 or TC3 land are also commonly required to have site-specific investigations. If you’re unsure, contact us and we’ll let you know based on your site and project type.
How much does a geotechnical report cost?
A straightforward report for a flat TC2 site typically starts from $1,400 + GST. Sites with more complex ground conditions, TC3 zoning, or sloping terrain will require more investigation and carry higher costs. We provide a fixed-price quote after a brief conversation about your project.
How long does it take?
Site investigation typically takes half a day. The completed report is usually delivered within 5-7 working days of the site visit. If you have a consent deadline, let us know and we’ll do our best to accommodate it.
What’s the difference between TC1, TC2 and TC3?
These are Technical Categories assigned to Christchurch land following the 2010-2011 earthquakes, based on liquefaction risk. TC1 is low risk, TC2 is moderate, and TC3 is high. TC3 sites require more detailed investigation and typically more engineered foundation solutions. We can advise on what’s required for your specific TC classification.
Can you work with my builder or designer?
Yes – we regularly coordinate with architects, designers, and builders to ensure the geotechnical findings feed directly into the foundation and structural design. We’re happy to liaise with your project team directly.
Do you cover areas outside Christchurch?
Yes. We work throughout Canterbury and can travel to other South Island locations depending on the project. Contact us to discuss your location.