Safe, fast and permanent solutions to lift and re-level sunken concrete slabs.
Cracked, uneven or sinking concrete slabs can create safety risks, drainage issues and long-term structural damage. At Raise + Relevel, we specialise in professional slab jacking solutions across Sydney, restoring concrete surfaces without the need for demolition or replacement.
20+ Years Experience
Sydney, Melbourne and Brisbane Based Experts
Permanent Foundation Solutions
Engineer Certified
Why Do You Need Slab Jacking?
Uneven concrete is more than a cosmetic issue. It often signals underlying ground problems that can worsen over time if left untreated.
Soil erosion beneath concrete
Soil erosion occurs when water washes away the ground supporting a concrete slab, creating voids underneath. Without proper support, the slab begins to sink, crack or shift, leading to uneven surfaces and long-term structural issues if left unaddressed.
Poor drainage or water ingress
Inadequate drainage allows water to flow beneath concrete slabs, weakening the soil and causing it to compress or wash away over time. This loss of support often results in uneven slabs, pooling water and increased risk of further movement during heavy rain.
Ground settlement over time
As soil naturally compacts and settles, especially in areas with reactive or poorly prepared ground, concrete slabs can gradually drop or slope. This slow movement often goes unnoticed until cracks, gaps or trip hazards become visible.
Tree root
movement
Tree roots can displace soil beneath concrete slabs as they grow and expand, lifting or shifting sections of concrete unevenly. In some cases, roots may also contribute to soil drying or erosion, increasing the likelihood of slab movement and instability.
Addressing the issue early helps prevent further sinking, cracking and costly replacement works.
What Areas Can Be Slab Jacked?
Residential driveways and pathways
Garage and shed slabs
Warehouse and factory floors
Commercial loading zones
External concrete around buildings
If concrete has sunk but remains structurally sound, slab jacking is usually the preferred solution.
Signs You May Need Slab Jacking
Visible cracks in concrete slabs
Uneven or sloping floors
Water pooling where it shouldn’t
Gaps forming beneath slabs
Doors or gates becoming misaligned
If you notice one or more of these signs, early intervention can prevent further structural issues.
How Slab Jacking Fixes the Problem
Slab jacking works by restoring support beneath sunken concrete slabs, addressing the underlying cause of movement rather than simply treating surface damage.
When soil erodes, compresses or shifts, empty spaces form beneath the concrete. Without support, the slab settles unevenly, leading to cracking, trip hazards and drainage issues. Slab jacking fills these voids and stabilises the ground, allowing the slab to be lifted back to its correct position.
Restores Structural Support Beneath the Slab
Concrete does not fail on its own — it fails when the ground beneath it can no longer support its weight. Slab jacking replaces lost support under the slab, creating a stable base that prevents further movement and uneven settling.
Lifts and Re-levels Without Replacement
By applying controlled pressure beneath the slab, slab jacking raises the existing concrete rather than removing it. This restores proper alignment while preserving the original slab, saving time, cost and disruption.
Stops Movement From Getting Worse
Once voids beneath the slab are filled, the concrete is no longer free to shift or drop. This reduces ongoing settlement and helps prevent cracks from widening or new damage from forming.
Improves Safety and Drainage
Uneven slabs create trip hazards and allow water to pool against buildings or flow in the wrong direction. Re-levelled concrete improves surface drainage and restores safe, even walking and driving areas.
Delivers a Long-Term Solution
When the underlying cause of settlement is addressed, slab jacking provides a durable, long-lasting outcome. The slab is properly supported from below, reducing the likelihood of recurring issues when compared to surface patching or cosmetic repairs.
Our Slab Jacking Process
Step 1
Foundation
Assessment
We begin with a detailed assessment of the affected area to understand why the slab has moved. This includes identifying signs of soil erosion, drainage issues or ground settlement, as well as evaluating the condition, size and use of the slab. This step ensures the solution targets the root cause of the problem, not just the visible symptoms
Step 2
Customised
Solutions
Every slab is different, so we develop a tailored lifting approach based on the slab’s dimensions, load-bearing requirements and underlying ground conditions. By selecting the appropriate injection method and materials, we ensure the slab is lifted safely, evenly and with long-term performance in mind.
Step 3
Professional
Execution
Specialised materials are carefully injected beneath the slab to fill voids, restore support and gradually raise the concrete back to its correct level. The process is controlled and precise, allowing the slab to be stabilised without causing further cracking or damage to surrounding areas.
Step 4
Post-Underpinning
Support
Once the slab is re-levelled, we confirm stability and ensure the area is safe for use. We also provide practical guidance to help minimise the risk of future settlement, including advice on drainage, water management and site conditions where required.
If your home or business requires foundation repair, R+R offers fast and clean underpinning services performed by trained professionals. Our team ensures the foundation is secure, stable, and restored to its original strength.
Why Raise + Relevel?
Request a Quote
Slab Jacking Questions
No matter where you live, you’ll see concrete forms somewhere, whether in a city or in the country. If you live in a house, there’s definitely concrete in that foundation. Over time, concrete can move and begin to sink – this is where the slab jack process comes into play. Slab jacking is the process of lifting sunken concrete slab and relevelling it to its as-built condition.
Unlike the more traditional method of foundation repairs, which jacks up the entire building and then fills beneath it, slab jacking is a more cost-effective and less time-consuming process. It is achieved by drilling holes in settled slabs or footings and injecting through the holes with polyurethane resin. Eventually, when enough polyurethane resin is injected beneath the footings, the force from this specialised resin will create enough pressure to raise and relevel the structure back into its original position.
This method is particularly effective for sinking concrete slabs, homes foundation, commercial buildings, and even pool surrounds. It ensures minimal disruption while achieving significant soil stabilisation and improving the bearing capacity of the ground beneath. It can be used for residential projects and public buildings, ensuring all structures are safe and level.
Slab jacking addresses a range of issues, from minor foundational shifts to significant structural subsidence. It ensures long-lasting results due to the durable materials used, providing peace of mind for property owners.
One of the main things that concrete slab jacking achieves is that it restores subsided structures back to level. Slab jacking is the most convenient concrete levelling solution. We use an expanding resin to improve the strength and bearing capacity of the foundations. As such, the structural polyurethane resin sets in seconds and gives us a high level of control over this structure with lift and areas that are being treated, rather than traditional concrete underpinning, which can take days. Slab jacking in this fashion can be compared with keyhole surgery, a quick and relatively easy method of re-levelling your concrete footing.
Concrete moves over time for a wide variety of reasons – no matter how solid you might think your foundation is, chances are, it may need to be slab jacked at some point during its lifetime. This can be due to the structure being poorly constructed or the foundations being improperly compacted, resulting in settlement.
It can also be due to changes in the environment, climate and indeed soil. Say you’re in a part of the country that is built on reactive clay soil types which are notorious for seasonal volumetric changes. These shrink-swell cycles can often impact the structure and manifest as cracks or damage.
If you’re purchasing or have purchased an older home that shows symptoms of subsidence, you’re going to want to get your foundation inspected by Raise and Relevel. This will ensure that whatever was originally constructed is still good to go before you start doing any other renovation work.
Slab jacking is suitable for many types of concrete, including driveways, garage floors, footpaths, patios, warehouse floors and commercial slabs. As long as the slab is structurally sound, lifting is usually possible.
There are several key signs to look for when inspecting your foundation. For instance, if you start seeing cracked walls – that’s a big sign that something is wrong with your foundation. Another thing to look out for is uneven flooring on the ground floor. You can also perform a visual inspection of your crawlspace to ensure that there’s no excessive moisture or separated piers.
If you notice sinking concrete slabs or uneven concrete, it could indicate deeper structural issues requiring immediate attention. Also, check your doorways and windows to see if they’re jamming. Jammed doors and windows are another tell-tale sign that something is wrong with your foundation – your doorways should not be crooked! Remember, it’s important that you have timely intervention to maintain the structural integrity and bearing capacity of your property.
Yes. When performed correctly and the underlying cause of settlement is addressed, slab jacking provides a long-lasting and stable solution. It restores proper support beneath the slab, reducing the risk of future movement.
In most cases, yes. Slab jacking is faster, less disruptive and significantly more cost-effective than removing and replacing concrete. It also preserves existing surfaces and reduces downtime.
Slab jacking lifts and stabilises the slab, which can help close some cracks. However, cosmetic crack repairs may still be required depending on the condition of the concrete.
Yes. Slab jacking is commonly used for warehouses, factories, loading docks and commercial floors where uneven concrete creates safety or operational issues.
We don’t need to disturb any of the original landscaping around the property – no need to tear up your lawn with big, heavy equipment – our resin pumping rig can fit in a driveway just fine! We use a portable pump to inject the resin into the holes we drill, so the process is as minimally invasive as possible.
For heritage listed buildings, public buildings, and other critical infrastructure, slab jacking offers minimal disruption while effectively addressing sunken concrete, cracked concrete, and foundations subsiding. This advanced technique is ideal for driveway relevelling, raising and relevelling structures, ground improvement, and void filling. Additionally, injection waterproofing and resin injection help in sealing water leaks and strengthen weak soil beneath structures.
FAQ
Your home is everything to you and your family, so before going ahead with any subsidence repairs, we’ve put together a list of questions our customers should ask:
We offer advice, not sales, so we don’t employ salespeople. The person who quotes your job does your job, and has been relevelling homes like yours for over 15 years.
Our specialists have raised over 7,000 homes in total.
If the problem returns, we return. We provide a fully guaranteed warranty on materials and workmanship.
At R+R, we have no call centres, no sales people and minimal overheads, all of which enables us to provide the best value for our customers.
R+R will deliver you better value, through real experience, with guaranteed results.
of Combined Experience
Homes Relevelled
Guaranteed
At Raise + Relevel, experience matters. With a century of combined expertise and over 7,000 homes re-levelled, we deliver lasting results—guaranteed.
Every home is unique. We provide tailored solutions at the best value, ensuring stability without compromise.