Auckland’s only ground engineering specialist with the full method portfolio — resin injection, cementitious grouting, mechanical reinforcement and drainage-led stabilisation.
Diagnosed by Grace. Engineered by Geofix. The method is chosen for your soil, not for the one product we sell.
Most Auckland ground engineering competitors are single-method businesses built around one proprietary product. We are built around the diagnosis.
In our experience, 90% of foundation problems start with subsidence — and 95% of subsidence is caused by water in the wrong place.
Layer 01 · Above — Water
Drainage failure, broken laterals, or surface runoff. This is where the cause almost always starts.
Layer 02 · Middle — Soil
Reactive clay, loose fill, or voids. This is where ground stabilisation methods operate.
Layer 03 · Below — Structure
Piles, slabs and footings. The consequence layer — where cracks and sloping floors appear.
Treat one layer in isolation and the problem returns. Treat all three and it doesn’t.
No single method is right for every Auckland soil. We recommend the honest solution for your specific site.
VIA GEOFIX
Best when soil requires densification or slab lifting.
VIA GEOFIX
Best for large scale voids or deep fills.
VIA GRACE
Best for organic peat or uncontrolled fill.
COMBINED
Best for Auckland reactive clays.
Every ground assessment follows the same six-stage protocol to ensure we recommend the right method for your soil.
Geotechnical:
Bearing capacity assessed on site.
Root cause:
Water or slope failure identified.
Options:
Methods compared honestly for you.
Upstream:
Address water first if it’s the cause.
Neutralise:
Replace or densify soil to spec.
Deliver:
One team, one warranty pathway.
The right method changes street by street. A national operator pricing from a generic playbook will sometimes get it wrong.
Mt Eden, Onehunga, Ellerslie, Greenlane.
Variable depth to basalt. Localised settlement common. Resin densification works well above the rock layer.
Recommended: Resin injection (most cases).
Te Atatū, Henderson, New Lynn, Glen Eden.
Aggressive shrink-swell soil. Drainage management is critical — no stabilisation holds without it.
Recommended: Drainage-led pathway.
Hobsonville, Beachlands, Bucklands Beach.
Soft estuarine clay or uncontrolled fill. Often too weak for resin densification alone.
Recommended: Soil replacement or grouting.
Albany, Birkdale, Glenfield, Torbay.
Layered clay over sandstone with seasonal perched water tables. Localised slumping common.
Recommended: Combined drainage + resin.
Every Grace ground stabilisation pathway is engineered through three simultaneous lenses. Single-method competitors only look through the lens that fits their product.
What is the bearing capacity now? What’s the soil’s response to the proposed method? Will resin densify it, or just compress around it?
Is water still entering the soil profile? If yes, fix the source before stabilising — or pay to do the job twice.
What does the house need? Lift, support, re-pile, or simply hold position? The structure determines the engineering tolerance — not the marketing.
Every ground assessment delivers a colour-graded verdict, defensible in insurance and pre-purchase contexts.
Hairline cosmetic cracks only. No measurable floor level deviation.
Sticking doors seasonally. Cracks reopening after redecoration.
Active subsidence. Floor level deviation >20mm. Visible exterior cracking.
Structural risk. Voids visible beneath slab. Sudden settlement after rain.
of subsidence cases we see start with water in the wrong place
ground stabilisation pathways available under the Grace Foundation Group
when Grace started diagnosing Auckland ground movement (15+ years of data)
team, one warranty, one signed pathway across drainage, soil and structure
Ground stabilisation treats the soil beneath a house — densifying, replacing or re-supporting it so it can carry load again. Underpinning treats the foundation — adding new structural elements (piles, footings) that bypass the weak soil. Both are valid solutions to subsidence. The right answer depends entirely on what’s actually wrong: weak soil that can be improved, or soil that’s beyond improvement and requires the structure to span past it. Most Auckland residential cases are stabilisation; some are underpinning; many are a combination. Grace delivers all three pathways.
Mainmark is a single-product business built around their Teretek® resin — a high-quality product, but the recommendation will always be resin because resin is what they sell. GSI Residential is engineering-led nationwide, but operates as a method-specialist without traditional foundation repair capability. Grace is built around the Grace + Geofix dual brand — Grace handles diagnostic, drainage and traditional foundation work; Geofix handles advanced ground engineering including resin and grouting. The four ground stabilisation pathways on this page are all delivered in-house. We recommend the method that suits your soil, even when it’s not the most profitable one for us.
For most Auckland residential resin injection jobs, the on-site work is completed in one to two days, with the house re-occupied the same day. Cementitious grouting takes longer to reach design strength. Soil replacement is the most disruptive and typically runs five to ten working days. Drainage-led stabilisation depends on the extent of drain repair required. The GROUND assessment gives you a precise timeline for your pathway before any work begins.
In our 15+ years of Auckland foundation work, 95% of subsidence cases begin with water in the wrong place — usually a broken stormwater or wastewater lateral, a failed soakage system, or poor surface drainage softening the soil over years. Stabilising soil while water continues to enter the profile is paying to fix the same problem twice. The diagnosis-first approach is the single biggest reason Grace work doesn’t return as a callback in year three.
Residential resin injection ranges from approximately $6,000 to $25,000 depending on depth, void volume and access. Drainage-led pathways typically range $4,000 to $18,000 depending on drainage extent. Cementitious grouting and soil replacement are quoted per site because scale varies enormously. The GROUND assessment ($595 + GST, credited to remediation if you proceed) gives you a fixed-price proposal for your soil — not a generic range.
Insurance coverage depends on the cause. Sudden events (storm, earthquake, water main failure) are commonly covered. Gradual ground movement and reactive clay shrink-swell are usually not. The GROUND assessment documents the cause to engineering-report standard, which is what insurers and EQC require. We deal with insurance-related ground claims every week and can advise on cover likelihood before you lodge.
When the diagnosis is right and the cause is addressed, ground stabilisation is permanent — resin injection in densifiable soil doesn’t biodegrade and doesn’t lose strength. When the diagnosis is wrong — for example, treating soil while drainage continues failing — the symptoms return within two to four years. The Grace + Geofix warranty covers the pathway, not just the method, which is why we insist on fixing the cause as well as the consequence.
Yes. Pre-construction subgrade improvement — for extensions, new builds on reclaimed sites, driveways, garage slabs and pool surrounds — is one of the four pathways. Geofix engineers the subgrade specification; Grace coordinates with your builder, architect or engineer. Common in west Auckland clay and coastal fill suburbs where the existing ground doesn’t meet bearing-capacity requirements for new structures.
A Grace engineer attends the property, runs the six-stage GROUND framework on site, takes floor-level readings, inspects drainage points and visible cracking, and reviews soil profile data for your suburb. You receive a written report with a risk grade (Green / Amber / Red / Black), a root-cause finding, all four method pathways evaluated for your specific soil, and a fixed-price proposal for the recommended pathway. The assessment fee is credited in full if you proceed with remediation.
Same-week appointments. Assessment fee ($595 + GST) credited to remediation works if you proceed.
Geofix is Grace’s advanced ground engineering division — the team that delivers resin injection and slab lifting when the answer is engineered, not patched.
