Get a FREE Quote Call Us

Search

If you cant find what you’re after please don’t hesitate to contact us.

Select Region

Please select the global region website you'd like to view.

Asia
Japan

Get a FREE Quote

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).

After clicking Submit, you’ll receive an email with the next steps—please check your inbox and spam folder.

Hidden
Photos or reports of issues (optional)
Drop files here or
Max. file size: 16 MB.
    Consent
    This field is for validation purposes and should be left unchanged.

    Un-level Buildings

    Do You Have an Unlevel Building or Home Structure in Need of Underpinning?

    An unlevel building can be a cause for concern and often shows noticeable signs. Common indicators include cracks in walls (both internal and external), difficulty opening or closing windows and doors, cracked floor slabs, or gaps appearing under skirting boards or around cornices and architraves.

    The most common cause of an un-level home or structure is subsidence due to weak or unstable ground. When the ground beneath a portion of your property cannot adequately support the building’s weight, foundation repairs, such as underpinning, may be necessary to restore stability.

    Residential Re-levelling In Action

    What Should You Do If Your House Is Sinking?

    If your house or building is sinking or unlevel, it’s highly likely that you’ll need underpinning to strengthen the structure. Traditionally, house underpinning involved concrete methods, but Mainmark specialises in a modern alternative known as  resin injection. 

    This advanced technique is the quickest, cleanest, and most effective solution for underpinning.

    If you notice your house sinking or cracks forming in your walls, don’t delay.

    Contact Mainmark to arrange a consultation with one of our ground specialists. They’ll provide expert advice on resin injection underpinning costs. Acting promptly is essential to prevent further damage and eliminate potential safety risks. 

     

    Why Is Your House Sinking or Unlevel?
    Possible Causes of Weak or Unstable Ground
    • Changes in moisture levels:
      • Excessive water from flooding or poor drainage.
      • Sustained dry periods, such as during droughts.
    • Damaged underground services: Leaking sewer or stormwater pipes.
    • Weak or unstable ground: Poorly compacted fill during construction.
    • Insufficient footings: Inadequate foundation design during the original build.
    • Erosion: Caused by natural events (e.g., floods) or issues like burst water pipes.
    • Tree roots: Absorbing moisture and causing the soil to shrink.
    • Nearby vibrations or excavation: Weakening the surrounding ground.
    • Overloaded foundations: Exceeding the structural capacity of the house’s footings.
    • Retaining wall or slope failure: Resulting in ground collapse.
    How Do You Fix an Unlevel Home or Building?

    Fixing an unlevel home or building typically involves strengthening the structure’s foundation and addressing the cause of the issue. Here’s an overview of the process:

    Identify the Problem

    Start by recognising the signs of an unlevel structure, such as:

      • Cracks in walls, floors, or ceilings.
      • Doors and windows that don’t open or close properly.
      • Uneven floors or visible gaps around skirting boards and cornices.

    Determine the Cause

    Common causes include:

    • Subsidence due to weak or unstable ground.
    • Changes in soil moisture, such as droughts, flooding, or leaks.
    • Poorly compacted fill beneath the foundation.
    • Damage to underground pipes or services.
    • Tree roots impacting the soil’s stability.

    Choose the Right Solution

    The method used to fix an unlevel home depends on the severity and cause of the problem. Common solutions include:

    • Resin Injection:
      A modern alternative to traditional underpinning, polyurethane resin is injected beneath the foundation to strengthen the soil, fill voids, and lift the structure back to level. This method is quick, non-invasive, and cost-effective.
    • Traditional Underpinning:
      This involves strengthening the foundation by extending it deeper into stable ground using concrete or other materials.
    • Drainage Repairs or Installations:
      Addressing water management issues, such as fixing leaks or installing proper drainage systems, can help stabilise the ground.
    • Tree Root Management:
      Removing or trimming invasive roots and installing root barriers can help prevent further ground shrinkage.

    Consult Professionals

    Repairing an unlevel home is complex and requires specialised knowledge. We provide expert assessments and solutions tailored to your property’s needs. Our resin injection method offers a fast, safe, and effective way to relevel homes and buildings.

    Act Quickly

    Delaying repairs can lead to further structural damage and increased costs. If you suspect your home or building is unlevel, contact a professional immediately to prevent safety hazards and preserve your property’s value.

    Foundation Repair For Un-level Buildings

    Before & After Treatment

    Houses that need to be re-levelled often develop cracks in walls, sinking floors, sticking windows or jammed doors.

    These houses require their foundations to be re-levelled.

    Mainmark’s non-invasive and cost-effective solutions can raise, re-level and re-support your home. Our innovative methods minimise site disruption and completed within one day.

    Features & Benefits

    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.

    Get a FREE quote

    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 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.

    Consent
    This field is for validation purposes and should be left unchanged.
    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

    Brisbane

    Canberra

    Hobart

    Melbourne

    New South Wales

    Perth

    Queensland

    South Australia

    Sydney

    Tasmania

    Townsville

    Victoria

    Western Australia

    Sectors

    Commercial

    Residential

    Infrastructure

    Mining

    Technologies

    Teretek®

    Terefil®

    JOG

    About Us

    Our team

    Careers

    Media & Press

    News

    Awards

    Contact

    Locations
    Mainmark Sydney

    169 Sailors Bay Rd, Northbridge NSW 2063

     

    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

    Privacy Policy

    Terms and Conditions

    Created by Codex

    YouTube
    Facebook
    LinkedIn
    Instagram