How much does Foundation Repair Cost?

Get a FREE 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 home or 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.

Why take it from us, read what our customers have to say :

Customer Testimonials

computer screen with Typical signs of subsidence

Want to learn more about the signs of subsidence?

Explore our interactive house and view typical subsidence problems around your home

Sinking floors, paths and driveway slabs, cracked walls, jamming doors and windows can all be indicators of structural damage due to subsidence and voids under the ground. Typical causes are unstable or weak ground, a broken pipe causing soil erosion, moisture changes in clay soil, nearby building and excavation works, and seismic activity or liquefaction. Our solutions are cutting edge and the modern answer to the traditional way to underpin; they are 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 under slabs and driveways.

Start Exploring

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

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 – many jobs are completed in a day.

Residents can usually stay in the home and may not even need to move much furniture.

We help 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.

We provide peace of mind – our resin injection method is backed by an industry leading 50 year product warranty. We are also a licenced builder that provides Home Warranty Insurance/Builders Warranty Insurance where required.

We're happy to have helped

“S____ who was leading the Mainmark team onsite is a credit to your company. He talked us through the job, kept us informed of progress and spoke about issues along the way that he resolved in conjunction with your engineer. The team of 3 you sent were probably the most trustworthy, friendly and professional of trades we have come across. They were also respectful of the property and mindful of the need to keep the disruption to a minimum.”

Tim, Caulfield South, VIC. July 2021.

“B____ visited our site and was informative, thorough and helpful. On this particular occasion Mainmark was not able to assist with our problem. This was explained to me and I was directed to the appropriate engineering service. Very professional, would recommend.”

Michelle, Bayswater, Auckland, NZ. July 2021.

“The people we dealt with were polite, timely and kept us informed at all times. All questions we posed were answered without any hesitation They presented as true professionals, completed the work efficiently and left our property in a very tidy state.”

Ken, Boondall, QLD. June 2021
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Start measuring wall cracks from the convenience of your home.

If you notice wall cracks around your home that are:

✖ Large cracks that start at windows, doorways or corners of buildings
✖ Cracks wider than 5mm
✖ Jagged, horizontal or vertical, zig-zagged, stepped in brickwork or follow mortar line

These characteristics may indicate weakness in your property’s foundation.

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

The ground beneath us is constantly shifting.

Subsidence is the propensity for upward, lateral, or downward ground movement, which can result in structures moving, sinking in one area or across the entire foundation footprint.

Problems we solve

Icon2_Cracked Walls

Cracked Walls

Solutions for structural damage due to sinking foundations

Icon1_Sinking Floors

Sinking Floors

Solutions for building subsidence

Icon3_Unlevel Buildings

Unlevel Buildings

Solutions for weak ground and subsidence

Icon4_Ground Instability


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