Subsidence Repair

Subsidence Repair Specialists Across New Zealand

If your home is experiencing subsidence, you may notice cracks in walls, uneven or sloping floors, sticking doors or windows, or gaps around frames. These are common signs of ground settlement and foundation movement.

In New Zealand, subsidence is commonly caused by reactive soils, moisture changes, poor drainage, seismic activity, or weakened supporting ground beneath the home.

Mainmark is New Zealand’s leading specialist in subsidence repair, delivering fast, cost-effective, non-invasive solutions that stabilise the ground and lift and re-level sinking foundations, without excavation, demolition, or major disruption.

Why Homeowners Choose Mainmark’s Subsidence Repair Solutions:

✔ Fast installation: often completed in a single day

✔ Cost-effective: compared to traditional underpinning

✔ Non-invasive no digging, no mess, no demolition

✔ Precise lifting using engineered resin technology

✔ Proven results across thousands of projects

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Residential Subsidence

What Is Subsidence?

Subsidence is the downward movement of the ground supporting your home, often caused by:

Changes in moisture in clay soils
Tree roots extracting water from the soil
Leaking pipes softening or washing away ground
Poorly compacted fill beneath foundations
Drought or heavy rainfall cycles

Left untreated, subsidence can lead to serious structural damage, cracks in brickwork, uneven floors, and even loss of property value.

Subsidence Repair for NZ Properties

Watch Our Subsidence Repair Solutions In Action

Signs Your Home May Have Subsidence

If you’re noticing any of these symptoms around your home, your foundation may be moving:

Cracked Walls

Cracks in internal walls or brickwork.

Sinking Floors

Uneven or sloping internal floors or external concrete slab.

Jammed Doors or Windows

Doors or windows that jam or stick.

Sinking Driveways

Sinking driveways, patios, or concrete slabs.

Resin Injection Subsidence Repair

Why Homeowners Choose Mainmark’s Subsidence Repair

Fast

Our technologies have fast curing times and treated areas can be used immediately or without the delays compared to traditional repair methods.

Environmentally Inert

Our technologies use an inert material that is non-toxic and does not leach into the environment or affect the treated area.

Non-Invasive

Our solutions are of surgical nature compared to traditional methods.

Cost-Effective

Compared to traditional methods, our solutions are more cost-effective, with minimal disruption to the area.

How We Fix Subsidence

Step 1

Our technicians drill small holes around the problem area.

Step 2

Teretek® resin is injected.

Step 3

Unique two-in-one solution improves ground bearing capacity and fills voids

Step 4

Building is brought back to level.

Why Choose Mainmark

The Leaders in Subsidence Repair

The Pioneers of Resin Injection Underpinning

The Pioneers of Resin Injection Technology in New Zealand.

In-House Engineers

Brings extensive knowledge and experience to every project.

ISO Accredited

Guaranteeing risk mitigation and operational excellence.

50 Year Product Warranty

Backed by a 50-year warranty and ongoing support you can trust.

Contact Us – Mainmark

Book a Foundation Repair Assessment in New Zealand:

If your home is showing signs of foundation movement, subsidence, or sinking foundations, acting early can prevent further damage and reduce repair costs.

Mainmark delivers fast, cost-effective, non-invasive foundation repair solutions across New Zealand.

Request your foundation assessment today to stop further structural damage and protect your home’s future.

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Subsidence FAQS

What is subsidence and why does it affect houses?

Subsidence is the downward movement of the ground beneath a house, causing the foundation to sink or shift. When the ground loses strength, the foundation moves, which leads to cracking walls, uneven floors, and structural instability.

What causes house subsidence in New Zealand?

House subsidence in New Zealand is mainly caused by:

Reactive clay soils
Moisture changes from rain, drought, or leaking pipes
Poor drainage around foundations
Seismic ground movement
Weak or loose underlying soils

These factors reduce soil bearing capacity and allow foundations to settle.

What are the first signs of subsidence?

Early signs of subsidence include cracks in walls, diagonal cracking around doors or windows, sloping floors, sticking doors, and gaps around frames. If multiple symptoms appear, subsidence is likely.

How do you fix subsidence?

Subsidence is fixed by stabilising and strengthening the ground beneath the foundation and, where required, lifting the foundation back toward level.

Mainmark fixes subsidence using engineered resin injection that fills voids, compacts weak soil, and re-supports the foundation.

What is the best method of subsidence repair?

For most homes, resin injection ground improvement is the best method of subsidence repair because it is non-invasive, fast, and cost-effective compared to underpinning.

Can subsidence be repaired without underpinning?

Yes. Most subsidence can be repaired without underpinning using resin injection. This method avoids excavation, concrete footings, and major structural works.

How long does subsidence repair take?

Most residential subsidence repairs are completed in one day.

Does subsidence repair permanently fix the problem?

Yes. When ground conditions are properly stabilised, subsidence repair permanently addresses the cause of foundation movement.

Is resin injection safe for subsidence repair?

Yes. Teretek® resin is environmentally inert, non-toxic, and designed specifically for ground improvement and foundation stabilisation.

How much does subsidence repair cost?

Subsidence repair cost depends on severity and ground conditions, but resin injection is typically significantly cheaper than underpinning.

Who specialises in subsidence repair in NZ?

Mainmark is a leading subsidence repair specialist in New Zealand, with decades of experience stabilising and lifting foundations.

When should I call a subsidence specialist?

You should contact a subsidence repair specialist as soon as you notice cracks in walls, sloping floors, or sticking doors.

Need Subsidence Repair in NZ?

Book a professional subsidence assessment with Mainmark New Zealand and find out what’s causing your foundation movement, and how we can fix it fast.

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