Foundation repair is the process of stabilising, strengthening, and re-supporting a building when the ground beneath it has shifted, weakened, or sunk. In New Zealand, foundation repair commonly addresses subsidence, settlement, earthquake-affected ground, and unstable soils.

Foundation issues in NZ are most commonly caused by subsidence, earthquake activity, liquefaction, reactive clay soils, poor drainage, water leaks, and long-term ground movement.

Common signs include cracks in walls, sloping or uneven floors, sticking doors or windows, gaps around frames, dropped slabs, and water pooling near the home. These symptoms usually indicate foundation movement or ground instability.

Subsidence occurs when the ground beneath a building sinks or loses strength. This causes the foundation to drop unevenly, leading to cracks, structural movement, and long-term damage if left untreated.

Sinking foundations are commonly repaired using resin injection, which strengthens weak soil, fills voids, and gently lifts and re-levels the structure, without excavation or demolition.

Resin injection involves injecting an engineered expanding resin beneath the foundation. As the resin expands, it strengthens the soil, fills voids, and lifts sinking foundations with millimetre precision.

Yes. Resin injection is widely used in New Zealand to stabilise and re-support earthquake-affected ground, including areas impacted by liquefaction and seismic soil disturbance.

Most foundation repair projects are completed within a few hours or in a single day, depending on the severity of movement and access conditions.

No. Modern foundation repair methods such as resin injection are non-invasive, meaning there is no digging, no major mess, and minimal disruption to the home and occupants.

Foundation repair costs vary depending on soil conditions, the extent of movement, and the repair method required. In many cases, non-invasive repairs are significantly more cost-effective than traditional underpinning or rebuilding..

Yes. Repairing and stabilising the foundation is usually far more affordable than partial or full rebuilds, while also preserving the existing structure.

Yes. Sunken concrete slabs, garage floors, driveways, and internal floors can often be lifted and re-levelled using resin injection.

Yes. Foundation movement and subsidence always progress over time, leading to increased structural damage and higher repair costs if not addressed early.

Foundation repair should be carried out by experienced ground engineering specialists with proven expertise in NZ soil and seismic conditions. Mainmark has delivered thousands of successful foundation repair projects across New Zealand and globally.