Quick Enquiry

Submit your enquiry using our online form and include a brief message about the type of issues you are experiencing. One of the Mainmark experts will contact you as soon as possible.

Quick enquiry

Get a FREE Site Assessment

Fast, Cost-effective Underpinning Foundation Repair

Mainmark are New Zealand’s underpinning, re-levelling and ground improvement experts.

 

We’ve helped homeowners and businesses re-level and protect their homes and buildings from subsidence.

 

Our engineered resin injection technologies deliver fast, non-invasive underpinning, without the mess, cost, or disruption of traditional methods.

 

If your home or property is cracking, sinking, or uneven, talk to the underpinning experts today and book a free site inspection.

Book a Site Assessment

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Why Choose Mainmark

The Leaders in Resin Injection Underpinning

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.

Underpinning

Watch Our Resin Injection Underpinning Solutions In Action

Problems we solve
for our clients

Cracked Walls

Fast, cost-effective and non-invasive subsidence solution to fix cracked walls.

Sinking Floors & Slabs

Fast, clean and non-invasive lifting of sinking floors and concrete slabs.

Jammed Doors or Windows

Our solutions are more cost-effective, with minimal disruption to the area.

Out of Level Concrete

We offer the most advanced house re-levelling and underpinning technology in the market.

Earthquake Damage

The world’s most advanced earthquake remediation, liquefaction mitigation and ground strengthening technologies.

Underpinning Repair

Resin Injection – the modern alternative to traditional underpinning. Description here

Residential Subsidence Repair

Before & After Treatment

Houses that need to be re-levelled often develop cracks in walls, sinking floors, sticking windows or jammed doors.

Our innovative solutions are designed to address sinking foundations and cracked walls, ensuring long-lasting stability for your home. Whether it’s a sinking foundation or a cracked wall repair, sinking concrete floor or re-levelling a driveway, we provide tailored services to every job.

We offer a range of underpinning options, including resin injection underpinning and concrete underpinning, to help raise and relevel sunken structures. The cost of underpinning varies depending on factors like the extent of damage and the type of foundation. Our expert team specialises in underpinning footings and crack wall repair, ensuring your home is safe and secure for the future.

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Benefits & Features

Mainmark’s Re-levelling Solutions & Technologies

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.

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Contact Us – Mainmark

Arrange a site assessment in 3 simple steps:

Step 1

Submit your enquiry using our online form. Include a brief message about the type of foundation issues you are experiencing.

Step 2

Our friendly customer service team will be in touch to schedule a site assessment that suits you.

Step 3

One of the Mainmark experts will visit your commercial property, assess the damage, and ascertain the likely cause. They will establish the approach needed, creating a plan specific to the needs of your building and provide you with a detailed quote.

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Mainmark

© 2026 The Mainmark group of companies. ‘Mainmark®’, ‘Terefil®’, ‘Terefirm®’ and ‘Teretek®’ are trademarks of the Mainmark group of companies.

Mainmark Ground Engineering (NZ) Ltd

ISO 9001
ISO 14001
ISO 45001

Solutions

Ground Improvement

Subsidence Repair

Re-Levelling

Void Filling

Slab Lifting

Crack Wall Repairs

Sinking Floor and Slab Repair

Sinking Foundation Repair

Underpinning

Soil Replacement

Specialties

Commercial

Residential

Seismic

Technologies

Teretek®

Terefil®

JOG

About Us

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Careers

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Awards

Contact

Locations
Mainmark Auckland

390 Neilson Street, Penrose, Auckland 1061

 

Mainmark Christchurch

2 Baigent Way, Middleton, Christchurch 8024

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