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Submit your enquiry using the online form with a brief description of the issue. A Mainmark expert will be in touch within 24–48 hours (excluding weekends and public holidays).

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    Fast, Cost-effective Underpinning Foundation Repair

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

     

    For over 36 years, we’ve helped homeowners and businesses re-level  and protect their 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 is cracking, sinking, or uneven, talk to the underpinning experts today and book a free site inspection.

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    Why Choose Mainmark

    The Leaders in Resin Injection Underpinning

    36 Years In Operation

    The Pioneers of Resin Injection Technology in Australia.

    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.

    Residential House Re-levelling Videos

    Watch Our Re-levelling Solutions In Action

    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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    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

    Benefits & Features

    Mainmark’s 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 Pty Ltd
    ABN: 51 606 182 503

    ISO 9001
    ISO 14001
    ISO 45001

    Solutions

    Ground Improvement

    Subsidence Repair

    Re-Levelling

    Void Filling

    Slab Lifting

    Crack Wall Repair

    Sinking Floors

    Sinking Foundation Repair

    Underpinning Repairs

    Locations

    Adelaide

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    Technologies

    Teretek®

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    Locations
    Mainmark Sydney

    Level 7/124 Walker Street, North Sydney NSW 2060

     

    Mainmark Melbourne

    Unit 8, 33 Rosalie Street, Springvale VIC 3171

    Mainmark South Australia

    19 Heath St, Lonsdale SA 5160

    Mainmark Queensland

    20 Computer Road, Yatala QLD 4207

    Mainmark Perth

    115 Excellence Dr, Wangara WA 6065

    Mainmark Tasmania

     4/11 McRorie Court Cambridge TAS 7170

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