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Our Solutions

Slab Jacking

If you’ve noticed your floors, driveway, paths, or pool moving we have an advanced solution to correct it.
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how to level sinking concrete

What is slab jacking?

Slab Jacking is the process of raising and re-levelling sunken concrete slabs that rest on the ground. These slabs could be the floors inside your home, garage or workspace. They can also be in external environments such as your pool area, driveway or walkways in your garden. Slab Jacking is also sometimes referred to as concrete levelling.

Why it’s essential concrete is level around your home?

When the large concrete slabs of your home’s interior flooring are sinking, it often means that your home’s subfloor foundation is also sinking. 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 collapse, jammed windows and doors, leaning walls and sloping floors.

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

Slab Jacking is crucial for halting these structural issues and reversing the effects, ensuring both your indoor and outdoor spaces remain safe, functional and visually appealing.

The conventional ways to level sinking concrete slabs

Self-leveling cement screed

This concrete levelling technique involves pouring a cement based mixture to even out floors. The cement is used to fix dips and slopes, creating the appearance of a level floor. This method can be effective when dealing with sloping slabs, however it can be a waste of time and money if the underlying issues are not rectified and the concrete continues to sink.

Demolition and replacement

Commonly known as break and replace, this method involves removing and constructing new concrete slabs. Despite high disruption and cost, it doesn’t address weak soils below and should only be done after a thorough geotechnical investigation to assess soil strength and ensure adequate support for new construction.

Concrete underpinning

Concrete underpinning isn’t a method often used to rectify sunken concrete slabs due to its high costs and disruption, but some builders still recommend it. With the assistance of heavy machinery, concrete is poured into holes below affected structures. Underpinning can be effective at stopping slabs from sinking further, but it cannot rectify levels and the cost can be prohibitive for many.
The one thing all conventional concrete levelling methods have in common is the disruption they cause to your home and daily life. These repairs can take several days, sometimes weeks to complete, leaving areas of your home off-limits for a long time. Solving sunken concrete slabs quickly and without the hassle involves looking into modern, less invasive techniques. Solutions that can offer rapid restoration and minimal impact to your home and budget.

Self-leveling cement screed

Read more
This concrete levelling technique involves pouring a cement based mixture to even out floors. The cement is used to fix dips and slopes, creating the appearance of a level floor. This method can be effective when dealing with sloping slabs, however it can be a waste of time and money if the underlying issues are not rectified and the concrete continues to sink.
Read more

Demolition and replacement

Read more
Commonly known as break and replace, this method involves removing and constructing new concrete slabs. Despite high disruption and cost, it doesn’t address weak soils below and should only be done after a thorough geotechnical investigation to assess soil strength and ensure adequate support for new construction.
Read more

Concrete underpinning

Read more
Concrete underpinning isn’t a method often used to rectify sunken concrete slabs due to its high costs and disruption, but some builders still recommend it. With the assistance of heavy machinery, concrete is poured into holes below affected structures. Underpinning can be effective at stopping slabs from sinking further, but it cannot rectify levels and the cost can be prohibitive for many.
Read more

Our advanced concrete levelling solution - GeoPoly™

GeoPoly™ is our geopolymer resin Slab Jacking solution. It’s a progressive approach for levelling concrete slabs and structures.

By injecting GeoPoly™ into the ground beneath, slabs can realign while simultaneously increasing the foundations load-bearing capacity to ensure a stable, permanent solution.

It works with a chemical expansion pressure, which is completely controllable and safe. Access underneath only requires a small drill hole roughly 1 cm wide, ensuring minimal disruption to your home.

If your floor, pool or driveway is sinking, we can stabilise and realign it, ensuring minimal inconvenience or disruption to you and your home.

Learn More
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The advantages of our GeoPoly™ slab jack 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.

Need a slab jacking solution? Book a FREE structural assessment today

Need a slab jacking solution?
Book a FREE structural assessment today

Book now

Watch: GeoPoly™ levelling a sinking concrete floor

Real feedback from real homeowners

Don’t just take our word for it! Hear what our customers have to say.

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

Google Reviews
Trustpilot Reviews
Five white stars highlight top-rated foundation repair for subsidence issues Five-star rating representing excellence in repairing cracked walls with HelicalBar Premium rating stars indicating successful rising damp treatment and structural drying Top customer satisfaction for GeoPoly resin injection slab stabilisation services High five-star rating showcasing quality underpinning for sinking foundations.

The Buildfix process was professional…

“The Buildfix process was professional from beginning to end. Their website provides useful information, and it is easy to book an assessment. The inspection is thorough and timely. The technicians are experienced, friendly and happy to answer all questions. The process is amazingly easy compared to traditional underpinning and can be completed in a day with minimal disruption. So far the works looks good.”

Zee J,

14 December
Five white stars highlight top-rated foundation repair for subsidence issues Five-star rating representing excellence in repairing cracked walls with HelicalBar Premium rating stars indicating successful rising damp treatment and structural drying Top customer satisfaction for GeoPoly resin injection slab stabilisation services High five-star rating showcasing quality underpinning for sinking foundations.

GREAT SERVICE

Thankyou to George and Michael for structural helical bar work , stage 2 of work on our home. We were well informed of the works to be carried out, the workman were very proficient and tidy . Very happy with the results .Quality company , well mannered workers highly recommend Buildfix.
Regards
Enzo & Sabien of Saratoga / Davistown NSW

Enzo,

22 September
Five white stars highlight top-rated foundation repair for subsidence issues Five-star rating representing excellence in repairing cracked walls with HelicalBar Premium rating stars indicating successful rising damp treatment and structural drying Top customer satisfaction for GeoPoly resin injection slab stabilisation services High five-star rating showcasing quality underpinning for sinking foundations.

Buildfix and my sinking Brick wall

Buildfix were great from day one! Substantial subsidence was assessed by Dale with short notice fit in with my busy schedule. I was provided with a comprehensive quote, accepted online and given a date and time not long after. On the day Jordan and Jack arrived on time, set up, got on with the job with great results, providing me with updates and were super informative throughout the whole process. They left the site clean. Fantastic, will use these guys again.

John Q,

11 December
Five white stars highlight top-rated foundation repair for subsidence issues Five-star rating representing excellence in repairing cracked walls with HelicalBar Premium rating stars indicating successful rising damp treatment and structural drying Top customer satisfaction for GeoPoly resin injection slab stabilisation services High five-star rating showcasing quality underpinning for sinking foundations.

Excellent service from start to finish

From our first phone call to today when our underpinning was done we couldn’t speak more highly of the service and the work. Learning that your house needs underpinning is extremely daunting but from the moment Joe from Buildfix turned up and was able to take us through what would be done including the fixed cost, we stopped worrying. Everything happened exactly as he said and we are more than happy to recommend Buildfix.

Consumer,

4 September
Five white stars highlight top-rated foundation repair for subsidence issues Five-star rating representing excellence in repairing cracked walls with HelicalBar Premium rating stars indicating successful rising damp treatment and structural drying Top customer satisfaction for GeoPoly resin injection slab stabilisation services High five-star rating showcasing quality underpinning for sinking foundations.

Zee J,

14 December

The Buildfix process was professional…

“The Buildfix process was professional from beginning to end. Their website provides useful information, and it is easy to book an assessment. The inspection is thorough and timely. The technicians are experienced, friendly and happy to answer all questions. The process is amazingly easy compared to traditional underpinning and can be completed in a day with minimal disruption. So far the works looks good.”
Read more

karen bryant,

15 November
Really happy with Buildfix and all the staff members. Bruno took the time to explain everything that was to happen on the of the repair. Andy and Pedro were a pleasure to deal will as they were both very professional and friendly. Again, they took time to explain the procedure. Ryan was also very professional and friendly and talked me through the process. I highly recommended this company.👍
Read more
Five white stars highlight top-rated foundation repair for subsidence issues Five-star rating representing excellence in repairing cracked walls with HelicalBar Premium rating stars indicating successful rising damp treatment and structural drying Top customer satisfaction for GeoPoly resin injection slab stabilisation services High five-star rating showcasing quality underpinning for sinking foundations.

John Q,

11 December

Buildfix and my sinking Brick wall

Buildfix were great from day one! Substantial subsidence was assessed by Dale with short notice fit in with my busy schedule. I was provided with a comprehensive quote, accepted online and given a date and time not long after. On the day Jordan and Jack arrived on time, set up, got on with the job with great results, providing me with updates and were super informative throughout the whole process. They left the site clean. Fantastic, will use these guys again.

Read more

Suzanne Jennings,

24 January
Very happy with how Jared explained the whole process before any work began and kept me updated on all progress. Both Jared and Kurt were courteous, on time hard-working and highly professional. We were overly happy with the result.
Read more

Read more reviews left by genuine Buildfix customers

800+ reviews on
Trustpilot green star rating beside reviews for foundation repair and wall cracks.
502+ reviews on
Read more

Reasons why you should choose Buildfix

FREE structural assessment and expert 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 underpinning technology GeoPoly™️, we can lift your foundations and solve your subsidence 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*, 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, Melbourne, Perth or anywhere else in between**, we’ll come out and do the job for you.

**Excludes some remote locations.

FREE structural assessment and honest advice

One of our structural engineers or consultants come to your home at no cost. Our assessments are thorough, you'll learn about your homes issues, and 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 underpinning technology GeoPoly™️, we can lift your foundations and solve your subsidence 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*, if not we'll beat it by 5%.

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

We cover many locations throughout Australia

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

**Excludes some remote locations.

#1 Slab Jacking
Top-Rated in Australia!

Five-star customer rating for Buildfix structural repair and rising damp solutions.

502+ Reviews

ongoogle logoas of Nov 2025
Five white stars highlight top-rated foundation repair for subsidence issues Five-star rating representing excellence in repairing cracked walls with HelicalBar Premium rating stars indicating successful rising damp treatment and structural drying Top customer satisfaction for GeoPoly resin injection slab stabilisation services High five-star rating showcasing quality underpinning for sinking foundations.

Rated 4.9/5

800+ reviews on
Trustpilot green star rating beside reviews for foundation repair and wall cracks.

Frequently Asked Questions

Can Slab Jacking Restore My Concrete to its Original Level?

Our primary goal is to stabilise the underlying soil of your concrete slab, preventing further sinking while aiming to reverse subsidence effects. With the innovative application of our GeoPoly™ technology, we are equipped to lift and level concrete slabs effectively. Nonetheless, it’s important to note that the success of these corrections can be influenced by the unique conditions at each site. Therefore, while we strive for optimal results, achieving a perfectly level surface may not always be possible.

Typically, yes. Most concrete levelling projects are completed within a day. However, project duration can vary based on repair complexity, area size and ground conditions, affecting the overall time frame.
No, this is a fairly common misconception about slab jacking. Slab jacking can successfully raise and relevel concrete slabs, such as driveways, and stabilise soils by filling voids directly beneath. Underpinning, on the other hand, is required for supporting heavier structures, like the load-bearing walls of your home. If your home requires underpinning, Buildfix offers an advanced ground engineering solution that tackles subsidence deep underground. Please visit our underpinning page to learn more.
Absolutely not. At Buildfix, we ensure procedures are conducted with minimal disruption to your daily life, allowing you to remain at home throughout the process.
Buildfix has successfully assessed and completed tens of thousands of projects across Australia over the past decade. This mostly includes residential projects but covers commercial and strata buildings as well.
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 on workmanship, as well as a 50-year product 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. It is classed as non-hazardous.
When it comes to performing work on the day, our team of skilled technicians will handle all aspects of repairs on your property. All Buildfix technicians are full-time employees, not subcontractors, ensuring you receive service from highly experienced and committed experts.
Slab jacking is a repair technique for lifting concrete slabs that have settled by pumping a material underneath to raise it back to its original level. It’s commonly used for sidewalks, driveways and house floor slabs.
If you notice uneven concrete surfaces, cracks or areas where one part of the slab has sunk lower than the surrounding area, slab jacking might be required to level out the surface and prevent further damage.
Traditional slab jacking uses a grout mixture, while advanced solutions like GeoPoly™ use a special geopolymer resin that expands to lift and stabilise the concrete slab.
Yes, when done correctly, slab jacking is considered a permanent repair that solves the underlying problem of soil settlement or compaction under the slab. How does GeoPoly™ differ from traditional slab jacking methods? GeoPoly™ is less invasive and often more precise than traditional slab jacking. It uses a lightweight, expansive geopolymer that quickly raises and stabilises the slab with minimal disruption and can be adjusted for precise levelling.
Buildfix technician using GeoPoly device for brick wall foundation repair.
Technician levelling with GeoPoly SJ120 for precise foundation repair alignment.

#1 Slab Jacking Top-Rated in Australia!

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

Book your FREE assessment
Technician installs GeoPoly SJ120 unit on brick wall for subsidence repair.

#1 Slab Jacking Top-Rated in Australia!

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

Book your FREE assessment

More Questions...

Look for signs like wall cracks, sloping floors, or sticking doors. If you’re concerned, we offer free structural assessments to identify the cause. We’ll provide honest advice and, if needed, a detailed repair plan with a fixed-price quote.

Our full-time technicians and trades professionals handle your project, overseen by our in-house licensed builders and structural engineers. We never outsource or subcontract, ensuring top-quality work from start to finish.

Our 20-year warranty covers materials and workmanship, plus unforeseen issues like flooding, soil erosion, or tree root damage—even if unrelated to our repairs. If problems arise at the repaired location, we’ll fix it at no cost.

Yes. GeoPoly™ is our proprietary product, developed and manufactured exclusively by Buildfix in Australia. We’re the only foundation repair company with rights to this formulation.

No need. We handle everything, including drainage inspections and blockage repairs. Our in-house plumbers ensure your underground services are protected, making the process seamless and hassle-free.

No. You only pay once the job is completed.

Not always. Fixing the foundation is crucial, but additional repairs may be needed for wall cracks or other issues. We offer over 30 specialised methods to fully restore your home.

We provide various structural repairs like wall crack repairs, concrete slab revelling, floor pier and stump repairs, and solutions for rising damp. We also offer cosmetic services like mortar repointing, plastering, and rendering.

We serve most major metropolitan areas and some regional locations across Australia, with hubs in Sydney, Melbourne, Brisbane, and Perth. Unsure if we cover your area? Call us at 1300 854 115.

More Questions...

Look for signs like wall cracks, sloping floors, or sticking doors. If you’re concerned, we offer free structural assessments to identify the cause. We’ll provide honest advice and, if needed, a detailed repair plan with a fixed-price quote.

Our full-time technicians and trades professionals handle your project, overseen by our in-house licensed builders and structural engineers. We never outsource or subcontract, ensuring top-quality work from start to finish.

Our 20-year warranty covers materials and workmanship, plus unforeseen issues like flooding, soil erosion, or tree root damage—even if unrelated to our repairs. If problems arise at the repaired location, we’ll fix it at no cost.

Yes. GeoPoly™ is our proprietary product, developed and manufactured exclusively by Buildfix in Australia. We’re the only foundation repair company with rights to this formulation.

No need. We handle everything, including drainage inspections and blockage repairs. Our in-house plumbers ensure your underground services are protected, making the process seamless and hassle-free.

No. You only pay once the job is completed.

Not always. Fixing the foundation is crucial, but additional repairs may be needed for wall cracks or other issues. We offer over 30 specialised methods to fully restore your home.

We provide various structural repairs like wall crack repairs, concrete slab revelling, floor pier and stump repairs, and solutions for rising damp. We also offer cosmetic services like mortar repointing, plastering, and rendering.

We serve most major metropolitan areas and some regional locations across Australia, with hubs in Sydney, Melbourne, Brisbane, and Perth. Unsure if we cover your area? Call us at 1300 854 115.

More Questions...

Look for signs like sagging or uneven floors, creaking boards, and difficulty opening doors. If you’re concerned, we offer free structural assessments to identify the cause. We’ll provide honest advice and, if needed, a detailed repair plan with a fixed-price quote.

Our full-time technicians and trades professionals handle your project, overseen by our in-house licensed builders and structural engineers. We never outsource or subcontract, ensuring top-quality work from start to finish.

Our 20-year warranty covers materials and workmanship, plus unforeseen issues like flooding, soil erosion, or tree root damage—even if unrelated to our repairs. If problems arise at the repaired location, we’ll fix it at no cost.

Yes. GeoPoly™ is our proprietary product, developed and manufactured exclusively by Buildfix in Australia. We’re the only foundation repair company with rights to this formulation.

No need. We handle everything, including drainage inspections and blockage repairs. Our in-house plumbers ensure your underground services are protected, making the process seamless and hassle-free.

No, you only pay once the job is completed.

Not always. Fixing sinking piers and stumps is crucial, but additional repairs may be needed for wall cracks or other issues. We offer over 30 specialised methods to fully restore your home.

We provide various structural repairs like wall crack repairs, slab re-levelling, subsidence repairs, and solutions for rising damp. We also offer cosmetic services like mortar repointing, plastering, and rendering.

We serve most major metropolitan areas and some regional locations across Australia, with hubs in Sydney, Melbourne, Brisbane, and Perth. Unsure if we cover your area? Call us at 1300 854 115.

More Questions...

How long will it take for my walls to dry after damp proof treatment?
We employ our damp proofing solution, DampBlock™, to counteract the effects of rising damp in your walls by blocking capillaries, reducing the walls ability to draw moisture upwards. After this process, the existing damp in your walls will generally take 6-12 months to dry out.
After the damp proofing process, your walls will start to dry. However, this can result in natural salt crystallisation and residual dampness on the surface. To prevent the surface plaster from deteriorating and the appearance of damp, an application of a salt-blocking solution is recommended, which we are happy to assist with and discuss during your assessment.
Certainly not. DampBlock™ is non-hazardous and completely odourless, allowing you and your family to stay at home while we work.
Buildfix has successfully completed well over 10,000 projects across Australia over the past decade. This includes mostly residential projects, as well as some commercial and strata buildings.
Absolutely. We proudly offer an industry-leading, transferable 20-year warranty on our products and workmanship, which 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 DampBlock™ is environmentally safe and poses no harm to the surroundings.
Yes, effective damp proofing can enhance the structural integrity of your property, prevent health hazards due to mould and ultimately improve the property’s market value and appeal to potential buyers.

More Questions...

How do I know if my home needs wall crack repairs?
If you’re noticing cracks in your walls, particularly near doors and windows, or if they’re growing over time, it’s likely you have a structural issue. Contact us for a free assessment and we’ll diagnose the problem.
No, not at all! Unlike traditional methods, our approach is non-invasive. We use HelicalBars™ and other advanced technologies to fix the cracks without any wall demolition.
The cost of repairing wall cracks depends on the severity of the damage. Most residential repairs range from $5k to $20k. We offer a free assessment and provide a fixed quote with no hidden fees.
In addition to wall crack repair, we provide subsidence repair, slab jacking, rising damp solutions, and more. We ensure your home is not only structurally sound but looks great too.
Absolutely! We back all of our wall crack repairs with a 20-year warranty.