COVID-19: your health and safety is our concern.

We are currently operating at reduced capacity in some regions due to COVID-19, but rest assured that we are still able to assist in reviewing the subsidence problems around your home. Click on the link to find out more.

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Helping to protect your biggest asset

Mainmark has raised, re-levelled and re-supported homes and buildings for over 20 years, delivering successful solutions to thousands of residential homes and hundreds of non-residential projects internationally, including Australia, New Zealand, Japan and UK.

Sinking floors, paths and driveways, cracked walls, jamming doors and windows can all be indicators of structural damage. Causes are various and include; building subsidence, bearing on unstable or weak ground, a broken pipe causing erosion, moisture changes in clay soil, and earthquake liquefaction. Our solutions are cutting edge and the modern answer to the traditional way to underpin; it is like keyhole surgery compared to concrete underpinning. Our alternatives to underpinning are not just for concrete slab floors. We can underpin, raise and re-level strip footings and raft slabs, plus we can infill slabs and driveways. We are experienced in a number of ground engineering techniques – including, in the past Uretek, now our proprietary Teretek engineered resin solution and JOG Computer Controlled Grouting – all non-invasive methods that are cost and time efficient.

Get peace of mind with Mainmark. Contact us today on 1800 623 312 (AU) or 0800 873 835 (NZ).

To help you discover if the cracks in walls around you home could be due to subsidence, we’ve developed this handy tool. Visit our crack gauge page to download our FREE crack gauge and start measuring and monitoring the wall cracks around your home now!

Print-at-home crack gauge

Unlike many level correction processes, our methods are very resident­-friendly.

We use non-invasive techniques, likened to keyhole-surgery, so we don’t tear up floors and excavate ground (the injection holes can be as small as 6mm).

We are very quick – on many jobs we are done in a day.

More often than not residents can stay in the home and may not even need to move much furniture.

We strengthen the future of the house – the methods we use strengthen weak ground, so your home generally becomes level, crack-free and more stable.

We don’t make mess – there’s no concrete dust, water or anything else to clean up.

We don’t cause further damage; in fact cracks generally close up and windows and doors become usable.

Problems we solve

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Cracked Walls

Solutions for structural damage due to sinking foundations

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Sinking Floors

Solutions for building subsidence

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Unlevel Buildings

Solutions for weak ground and subsidence

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Solutions for shifting ground and ground instability


Holes and Voids

Solutions for cracks, crevices and large voids


Earthquake Damage

Solutions for liquefaction mitigation and ground strengthening

We're happy to have helped

“Job done and a fantastic result was achieved. Credit to your team, they did an amazing job.”

Adam, Tempe, NSW. August 2018

“Many thanks for taking a huge weight off my shoulders your 3 man team were thorough gentlemen and I would recommend your service to anyone with a subsidence problem.”

Alan, Palmerston North, North Island, NZ. October 2018

“I would like to thank you for assistance, it was very much appreciated and your worker were very helpful and professional in their work.”

Jo, Cootamundra, NSW. April 2018
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