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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.

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Re-support & Re-level Your Hobart Property Today!

Welcome to Mainmark, your trusted underpinning, house re-levelling and  subsidence experts in Tasmania.


As a leading ground engineering company with a strong local presence, we specialise in house re-levelling, subsidence repair, and more.


With 35 years of experience and a local team based right here in Tasmania, we deliver personalised solutions tailored to your unique needs.


Our expertise spans both residential and commercial properties, ensuring effective and long-lasting subsidence solutions for all types of structures.


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House Re-levelling Videos

Watch Our Re-levelling Solutions In Action

Problems we solve

Is Your Hobart Home Showing Signs of Subsidence?

Cracked Walls

Do hairline cracks appear in your walls, particularly around doorways or windows? These cracks can worsen over time and become a structural concern.

Sinking Floors

Uneven floors are another telltale sign of subsidence. This can manifest as noticeable dips in specific areas or doors and windows that suddenly stick or become difficult to open.

Jammed Windows & Doors

These issues can arise due to foundation movement caused by subsidence.

Unlevel Building

Over time, subsidence can cause your entire property to become noticeably unlevel. This can be particularly evident on sloping sites or by observing leaning chimneys

All of these signs point to potential subsidence problems

If you’re experiencing any of these issues, you must address them promptly to prevent further damage to your property.

That’s where Mainmark comes in.  We offer a site inspection by one of our qualified experts.  They’ll thoroughly assess your property, identify the cause of the problem, and recommend the most suitable repair solution for your specific needs.

Mainmark Solutions

Your Tasmania subsidence repair experts. Mainmark offers a comprehensive range of residential and commercial subsidence repair solutions.

Resin Injection

We offer a variety of modern alternative underpinning solutions to strengthen and stabilise your home’s foundations.

House Re-levelling

Our precise re-levelling techniques can restore your property to its original level, rectifying uneven floors and other related issues.

Crack Repair

We can address existing cracks in your walls to prevent further damage and improve the structural integrity of your home.

Prevent Subsidence Damage to Your Hobart Home – Contact Mainmark Today

If you’re concerned about subsidence in your property, don’t hesitate to reach out to the Mainmark Tasmania team.

We offer a complimentary site inspection with one of our qualified ground engineering experts who will assess your situation and recommend the best course of action.

Timely and professional solutions can prevent further damage to your home, saving you both money and stress in the long run.

Get in touch with us today to safeguard your property against subsidence. Our team of specialists is here to support you every step of the way.


How we get your home back to level
in as little as a day.

Benefits & Features

Mainmark’s Solutions & Technologies


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.


Our solutions are of surgical nature compared to traditional methods.


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

Traditional Underpinning vs Resin Injection Solution

House Underpinning

The traditional method

Excavation – Heavy machinery is required to dig large holes to depths often up to 3 metres.
Soil removal – large quantities of dirt and rock are loaded onto dump trucks and transported away from the site
Pouring Concrete– filling the holes or “piers” with concrete can be complex and logistically challenging depending on the site.
Curing time – concrete can take several days to get to strength.

House Resin Injection

The modern alternative

Tiny holes– Teretek is applied through keyholes, typically 6mm to 16mm in diameter.
Clean and quiet – The process is clean and quiet, has minimal impact on residents.
Resin injection – The resin injects into the ground and expands in the ground within minutes.
Curing time – 30 minutes. You can even use the building during the process.

Contact Us – Mainmark Tasmania

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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ISO Accreditation

Mainmark is proud to have achieved and maintained our ISO Accreditation since 2017.

Tasmania Underpinning Frequently Asked Questions
What is underpinning?

Underpinning is the process of extending the foundation of a building to a deeper layer of soil. This is traditionally done by digging deep holes under the footing and filling the hole with concrete.

What are the alternatives to underpinning a house?

The main alternatives to traditional underpinning are resin injection and screw piles.

Resin injection strengthens the soil beneath the footing by compacting the ground. Screw piles extend the footings to a deeper layer of soil.

What is the cheapest method of underpinning a foundation?

The cost to underpin a footing can vary significantly, and depends on the method adopted, soil condition, accessibility to the failed footing and proximity of other buildings and pavements to the work area.

Traditional underpinning is labour intensive and involves large excavations, so its price does depend on how busy the contractor is. Resin Injection and screw piling have more stable prices.

How much does the underpinning cost?

Traditional underpins vary from $1000 to $4500 per underpin for shallow underpins.

Deeper underpins are more expensive as each excavation requires shoring to make the hole safe.

How much does resin injection underpinning cost?

Resin injection typically costs in the range of $1100 to $1400 per linear meter of the footing to be supported.

How long does it take to underpin a house?

Traditional underpinning required digging holes next to the footing and then filling them with concrete.

The excavation of the holes can take some time and will impact gardens and paths as they will be removed.

Traditional underpinning could take a few days for a single underpin to several weeks.

How long does underpinning last?

Concrete underpins if well-constructed using sound concrete should last more than 50 years.

Is resin injection as good as underpinning?

Resin injection is different to underpinning.

Resin injection involves strengthening the ground beneath the footing, whereas underpinning involves extending the footing to a deeper layer of soil.

What are the dangers of underpinning?

There are several pitfalls when using concrete underpins.

In reactive clay soils, if only part of the footing is underpinned then there will be differential seasonal movement between the underpinned sections of the footing and the rest of the footings.

This difference in seasonal movement will result in large cracks forming in the walls adjacent to the areas that have been underpinned.

Another problem that arises with traditional underpinning is poorly compacted soil adjacent to the underpin acts as a water path to the underside of the underpin and can undermine the underpin.


© 2024 The Mainmark group of companies. ‘Mainmark®’, ‘Terefil®’, ‘Terefirm®’ and ‘Teretek®’ are trademarks of the Mainmark group of companies.

Mainmark Ground Engineering Pty Ltd
ABN: 51 606 182 503

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