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Solving Sunken Concrete

Fix your Sunken Concrete Slabs!

If you’ve observed sinking in your floor, driveway, path, or pool, we have the solution.

What are the symptoms of sinking concrete that I should be looking out for?

Floor Drops

If one side of your concrete floor has sunk deeper than the other, it may cause the floor to slant. This creates unwanted drops as you walk, which can be a dangerous trip hazard. If it feels like you’re walking up or down steps when you and your family walk across the floor, it’s likely a floor drop caused by sunken concrete.

Bowing Floor and Door Issues

If the central area of your concrete floor is sunken, your floor will have a noticeable bow. A bowing floor will subtly dip in the middle, forming a concave shape. You can test for this by placing a ball at the edge of the floor. If it rolls towards the centre of the room, you’ve got issues. If floor bows aren’t fixed, internal doors can begin to jam as excess forces are moved around the structure.

Gaps under Skirting Boards

By design, skirting boards are meant to sit flush against the base of your interior walls. If they’re not, something’s wrong. Take note of whether the floors and walls have separated. If your skirting boards have pulled away to reveal gaps underneath the internal walls of your home, then a sunken concrete floor may be the cause.

Floor Drops

If one side of your concrete floor has sunk deeper than the other, it may cause the floor to slant. This creates unwanted drops as you walk, which can be a dangerous trip hazard. If it feels like you’re walking up or down steps when you and your family walk across the floor, it’s likely a floor drop caused by sunken concrete.

Bowing Floor and Door Issues

If the central area of your concrete floor is sunken, your floor will have a noticeable bow. A bowing floor will subtly dip in the middle, forming a concave shape. You can test for this by placing a ball at the edge of the floor. If it rolls towards the centre of the room, you’ve got issues. If floor bows aren’t fixed, internal doors can begin to jam as excess forces are moved around the structure.

Sunken concrete in a home

Gaps under Skirting Boards

By design, skirting boards are meant to sit flush against the base of your interior walls. If they’re not, something’s wrong. Take note of whether the floors and walls have separated. If your skirting boards have pulled away to reveal gaps underneath the internal walls of your home, then a sunken concrete floor may be the cause.

Why does it matter?

Sunken Concrete Slabs: A Warning Sign Inside and Outside Your Home

When the large concrete slabs that constitute your home’s interior flooring are sinking, it often indicates that your homes sub-floor foundation is also settling. This downward movement places immense pressure on your home from its foundation upwards, leading to a cascade of structural issues such as wall cracks, ceiling and cornice fissures, jammed windows and doors, leaning walls, and sloping floors.

Similarly, sinking outdoor concrete slabs in areas like driveways or pools signal underlying problems. The repercussions extend from drainage failures and underground service damages to safety hazards and aesthetic deterioration.

Resolving sinking slabs is crucial for halting these structural issues, ensuring both your indoor and outdoor spaces remain safe, functional, and visually appealing.

Introducing GeoPoly™ A Game-Changer for Homeowners: The Non-Invasive Solution to Sunken Concrete Issues

By injecting GeoPoly™ beneath your concrete slabs, we not only raise the slabs but also stabilise the underlying foundation soil for lasting support. GeoPoly™ operates through a safely controllable chemical expansion pressure. The process only requires a discreet 1cm drill hole for access, ensuring minimal surface disruption.

Whether it’s a sinking floor, pool, or driveway, we offer a low-impact solution to stabilise and lift the affected areas.

Need a solution to raise concrete? Book a FREE structural assessment today

Need a solution to raise concrete?
Book a FREE structural assessment today

Watch: GeoPoly™ transforms a sinking home in minutes!

The advantages of our GeoPoly™ solution

Lift Sunken Slabs

If you have sunken concrete slabs, GeoPoly™ can give them a lift, improving levels, making your home look better instantly.

Minimal Disruption

GeoPoly™ is non-disruptive and is injected through small drill holes. You and your family can stay home while we work.

Immediate Results

GeoPoly™ gets to work fast, meaning sunken slabs can be fixed in no time. Most jobs are completed in just one day.

20-Year Warranty

You’ll get complete peace of mind. We guarantee your subsidence won’t return, or we return at no cost to you.

Is your home suffering from sinking concrete?

Is your home suffering from sinking concrete?

Sinking concrete can impact your home dramatically. If you suspect your home is suffering sinking issues, it’s worth having it looked at sooner than later.


We’re happy to take a look at your home for FREE.

Top-rated reviews from real homeowners

Don’t just take our work for it! Hear what our customers say.

Read genuine reviews on Google and Trustpilot to learn about the real experiences others have had with our services.

#1 Slab Jacking
Top-Rated in Australia!

386+ Reviews

ongoogle logoas of Feb 2025

Rated 4.9/5

736+ reviews on

6 Reasons why you should choose Buildfix

FREE structural assessment and honest advice

Buildfix structural engineers or consultants come to your home at no cost. Our assessments are thorough, uncovering your home’s issues and the best solutions.

UNLIMITED GeoPoly™️ for your job

After we’ve completed your quote, we don’t change it. We don’t add extra costs at the end. With us, there are no tricks, no games and zero surprises.

Permanent repair guaranteed

Using our advanced technology, GeoPoly™️, we can lift your concrete slabs and solve sinking issues permanently. Everything we do is guaranteed to last.

Experience - thousands of projects completed

With well over 15000 projects completed, you'll get the most experienced and committed teams around. Your home is in expert hands with our proven track record.

Best price promise

With our leading techniques and technology, we work more accurately and more efficiently than anyone else. We promise the best price* on advanced underpinning technology, if not we'll beat lower offers by 5%.

*Must be like-for-like, covering the same area with unlimited GeoPoly™️, or similar material.

We cover locations throughout Australia

Our teams are ready to go where you live. Whether it be in Brisbane, Sydney, Canberra, Melbourne, Perth or anywhere else in between**, we’ll come out and do the job for you.

**Excludes some remote locations.

Discover our methods: watch how we transform homes

Need a damp proofing solution? Book a FREE structural assessment today

Need a damp proofing solution?
Book a FREE structural assessment today

About Buildfix

As Australia’s leading expert in structural repair, Buildfix provides non-disruptive, cost-effective solutions to homeowners across Queensland, New South Wales, and Victoria. Each month, we conduct hundreds of FREE structural assessments, resulting in thousands of successful repair projects for homeowners every year.

Our dedicated team includes qualified engineers, licensed builders and expert technicians, all focused on precision, safety, and the long-term stability of your home. With our advanced technology, extensive experience and collective skills, you can be confident that your home is in the most capable hands.

“Buildfix’s priority is getting best outcome for you, and your home.”

Frequently Asked Questions

Will my concrete slab become level after lifting?

Buildfix aims to stabilise the soil under your concrete slab to halt any further sinking. Often, our GeoPoly™ technology can successfully lift and level the slab. However, outcomes can vary as they are determined by site-specific conditions.

Mostly, yes. The majority of our projects are completed within a day. However, the duration varies depending on the complexity of the repair, the area size, and the ground conditions.

Definitely, no. Buildfix primarily works externally, allowing you to continue your daily life. Occasionally, we require indoor access based on the project’s needs, but we’ll work around you.

Buildfix has successfully completed over 15000 projects across Australia spanning the past decade. This includes mostly residential projects, and occasionally some commercial and strata buildings.

Minimal disruption is one of our aims. We inject our GeoPoly™ resin through small holes in the ground, akin to ‘keyhole surgery,’ minimising excavation and mess. You can continue with your regular home life while the work is being carried out.

Absolutely. We proudly offer an industry-leading, transferable 20-year warranty. This extensive coverage ensures your peace of mind for years to come and adds value to your property, even if you decide to sell it in the future.

Yes, our GeoPoly™ resin is environmentally safe and poses no harm to the surroundings.

When it comes to performing work on the day, our team of skilled technicians will handle all aspects of repairs on your property.

Need Concrete
Relevelling Today?

We’re happy to take a look at your home for FREE.

Need Concrete
Relevelling Today?

We’re happy to take a look at your home for FREE.