Screw Pile Underpinning for Subsiding Foundations
Stabilising foundations using permanent, structurally engineered methods to protect your home's integrity.
A permanent, structural, engineered solution to compromised foundations
The Screw Pile Method
Underpinning a building is the process of restoring the integrity of the foundation. It is required when the existing foundation has failed and as a result, the structure begins sinking, cracking or is compromised in some related way.
Underpinning can be done using a few different methods – using steel screw piles, concrete piers or grout injection. We exclusively use the screw pile underpinning method as it provides unique advantages over other methods.
Screw Pile Underpinning, as the name suggests, is when steel piles are screwed into the ground to a depth that will ensure a solid foundation. The piles are then concreted in place and securely integrated with the existing building.
Most importantly, our method allows a cost effective read to deeper depths securing the structure below the zone of influence (ZOI) – the soil layers that shrink and swell with seasonal variance. Other methods that do not secure at this level are only a band-aid method.
The advantages of screw pile underpinning
Why this method leads the industry in reliability, precision, and results
Screw piles offer a modern, engineered solution for underpinning that provides long-term structural stability—making them a standout choice for homes experiencing foundation movement.
Secure
Unlike polyurethane, resin-like injection, which can be unpredictable in variable soil conditions, screw piles are mechanically installed deep into stable strata, ensuring that the building is supported on solid, load-bearing ground. Each pile is installed with precise torque monitoring, giving engineers accurate, real-time feedback that confirms the integrity and load capacity of each pile. This controlled installation process provides peace of mind for homeowners, as it’s based on measurable data rather than guesswork.
Precision
Another key advantage of katana screw piles is their ability to lift and re-level a structure with control and precision. Because the piles are connected to the footing, hydraulic jacks can incrementally raise sections of the home as needed. This is especially useful for correcting subsidence, as it allows the structure to be brought back to level in a stable and gradual way, reducing the risk of damage during the process. Unlike mass concrete underpinning, which is more invasive and slower to install, katana screw piles are quicker to install, cause minimal disruption to the site, and don’t require extensive excavation.
We’ve repaired over 250+ homes using screw pile underpinning with 100% success rate. Here’s why:
- Engineered for Precision
- Controlled Lifting and Level Correction
- Minimal Disruption to Your Property
- Long-Term Foundation Stability
- Adaptable to a Range of Site Conditions
- Environmentally Sustainable
- Katana Codemarked Screw Piles
Problems we solve in your home
Permanently!
If you are experiencing one or more of the following issues in your home, this could indicate a foundation problem in need of repair. The quickest way to find out is to get some expert advice.
Through our free home checkups, we’ve helped 1,300+ homeowners uncover the root causes of their subsiding and cracked houses, providing transparent advice to improve the safety, appearance and value of their home.
Our Process
How we repair foundations
Phase 1
Before We Begin
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Foundation Advice
In the initial phase of our process, we offer complimentary foundation advice, empowering homeowners with insights and clarity. -
Home Checkup
Our process continues with a non-invasive site visit. We review the visible symptoms, investigate the likely contributing factors/symptoms of movement, and determine whether your home can benefit from underpinning. If so, our engineers will independently carry out a forensic assessment subject to your approval which will assist with us developing a tailored, structurally sound solution based on your home’s unique situation. -
Transparent Quotation
We provide a transparent, all-inclusive underpinning quote, eliminating hidden charges. Fixed-price quotes ensure clarity, laying the groundwork for a confident and transparent repair process. -
Scheduling Precision
Coordinating with homeowners, we set a start date that aligns with their schedule. A pre-work Kick-off Meeting ensures mutual understanding before physical repairs begin.
Phase 2
The Foundation Repair
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The Underpinning
The underpinning project starts with meticulous preparation of the underpin locations. We then continue on to installation of the Katana Screw Piles, securing these to our patented lift rig system Lift Rig MAX. -
The Lift and Stabilisation
Depending on each building’s circumstances, this stage may involve lifting the house and/or stabilising the existing foundations to ensure long term stability and arresting of continued movement. We keep you involved in each step and we don’t lift a home without you being on-site, so you can fully understand and appreciate how we operate and take care of your home. -
Conclusion and Cleanup
In the final project phase, we conduct a thorough site check, ensuring a well-restored site. We run an Exit Meeting with you to ensure homeowner satisfaction. Our primary goal is to maintain our 100% success and satisfaction rate by delivering on our promises.
Phase 3
After We've Finished
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Completion Forms
We will provide the necessary completion forms detailing the work, including the Form 12 Inspection Certificate from the Structural Engineer. This serves as a record of work quality, valuable for future property transactions.
How much does screw pile underpinning cost?
Transparent pricing, with no surprises
The cost of repairing a foundation using underpinning can vary based on a number of factors such as the extent of the area of compromised foundation damage seen via floor levels, the size of the building, soil conditions, access conditions and permits needed.
We assess all these factors in advance and provide a line-by-line quote for complete transparency – and then we lock that cost in so there are no surprises or hidden variables.
Why we’re the best choice
You deserve more!
We're a Master Builder
Fixed Pricing
Fixed Schedule
What our customers have to say
Thank you
FAQs
Still have questions?
It varies based on each job, though most residential installations are completed in a matter of weeks, depending on the size of the job. Once we understand the nature of your foundation problems, we will map out a timeline to give you clarity.
Installation is generally low-noise and low-impact compared to heavy excavation work. The main piece of machinery we use is a mini-excavator to access the foundation and install/drill the Katana screw piles into the ground.
Structural re-levelling can close some cracks, but very likely cosmetic repairs may still be needed. We can review this with you as part of our assessment and offer solutions to this too.
When properly designed and installed, screw piles provide a permanent solution and they’re backed by structural warranties (not just “product” and “labour” warranties). They are purpose-designed by an engineer for your specific situation to be a permanent solution of support to your home for the life of the structure.
In most areas, yes—we will typically handle this process for you. So once you decide you can just sit back, relax and we will take care of everything for you.
Contact us today to know more.