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    Re-level & Re-support Your Home

    Floor Re-Levelling for Sunken Floors & Sinking Foundations

    Fast, non-invasive solutions to raise, re-level and re-support your home and building.

     

    When floors start to sink, dip, slope, or feel uneven, it’s often a sign of foundation movement or subsidence. Left untreated, sunken floors can lead to cracked walls, jammed doors, structural instability, and costly repairs.

     

    Mainmark provides advanced floor re-levelling solutions that safely lift and re-support sinking floors, slabs, and foundations,  without the need for excavation or major disruption.

    Book a Site Assessment
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    Why Choose Mainmark

    The Leaders in Foundation Re-levelling

    36 Years In Operation

    Australia’s most experienced and trusted re-levelling experts.

    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.

    Floor Re-levelling Solutions

    Watch Our Re-levelling Solutions In Action

    Foundation Re-levelling Repair

    Before & After Treatment – Foundation Re-levelling

    Foundation Re-Levelling, Resin Injection Underpinning Foundation & Crack Repair Experts

    Our innovative foundation re-levelling solutions are designed to fix sinking foundations, uneven floors, and cracked walls, restoring long-lasting stability to your home. Whether it’s re-levelling a driveway, lifting a sunken slab, or repairing foundation cracks, we tailor every solution to suit your property’s needs.

    We offer a range of proven underpinning methods, including resin injection underpinning and concrete underpinning, to lift and re-support sunken structures safely and efficiently. The cost of foundation re-levelling depends on factors such as damage severity and foundation type. With decades of experience in foundation re-levelling, footing repair, and wall crack restoration, Mainmark ensures your home is stable, secure, and built to last.

    Get a FREE quote
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    Sinking Foundations 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

    Foundation 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.

    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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    FAQ on Foundation Re-levelling

    Australia’s Floor Re-levelling Experts

    If you’re dealing with sunken floors, sinking foundations, or an uneven concrete slab, Mainmark provides fast, precise, and non-invasive floor re-levelling and slab lifting solutions. Using advanced resin injection technology, we raise and re-support sinking floors, stabilise subsiding foundations, and repair sunken concrete slabs without excavation or major disruption.

    Whether your home is affected by subsidence, foundation settlement, voiding beneath slabs, or soil movement, our proven methods lift floors back to level, restore structural integrity, and help prevent further damage. From internal floor re-levelling to driveway lifting, garage slab repair, and uneven floor restoration, we provide tailored solutions for any type of property.

    If you’ve noticed cracks in walls, sloping floors, or gaps around skirting boards, book a free site inspection today, it’s the fastest way to fix sinking floors, restore your concrete slab, and protect your home from worsening foundation movement.

    Get a FREE Quote
    What causes sunken floors or sinking foundations?

    Sunken floors and sinking foundations are usually caused by subsidence, foundation settlement, weak or reactive soils, water leaks, or voids forming under the concrete slab. When the ground can’t support the structure, the slab begins to sink or tilt, leading to uneven floors and structural cracks

    How do you fix a sunken floor or sinking foundation?

    The most effective way to fix a sunken floor is with resin injection floor re-levelling, where expanding engineered resin fills voids, strengthens weak ground, and lifts the slab back to level. This method repairs sinking floors, sunken concrete slabs, and subsiding foundations quickly and non-invasively.

     

     

    Can concrete slabs be lifted and re-levelled?

    Yes. Most concrete slabs, including internal floors, driveways, footpaths, garage slabs, and patio areas, can be lifted using slab lifting or slab jacking with engineered resin. If your concrete slab is sinking, lifting is often faster, cleaner, and more cost-effective than replacing it.

    What are the signs of floor subsidence?

    Signs your floors may need re-levelling include:

    • Sloping or uneven floors

    • Cracks in walls or tiles

    • Gaps between skirting boards and floors

    • Sunken or soft spots in concrete slabs

    • Sticking doors and windows
      These are common indicators of foundation movement, subsidence, or sinking floors.

    How long does floor re-levelling take?

    Most floor re-levelling and slab lifting projects are completed in just a few hours. Because resin injection is non-invasive and requires no excavation, you can usually continue living in your home during the works.

    How much does floor re-levelling cost?

    The cost depends on the extent of subsidence, size of the slab, ground conditions, and access. Floor re-levelling is typically more affordable than replacing a concrete slab and prevents long-term structural damage caused by sinking foundations. We provide clear, fixed-price proposals after inspection.

    Is resin injection better than traditional underpinning?

    For most sunken floors and sinking slabs, resin injection is faster, cleaner, and more cost-effective than traditional underpinning. It lifts slabs with precision, strengthens the ground, and avoids the mess and disruption of digging.

    Does floor re-levelling stop further sinking?

    Yes. By strengthening the ground beneath the slab and restoring support, resin injection helps prevent future subsidence, foundation movement, and slab sinking. It’s designed to provide long-lasting stability.

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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

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