House Underpinning Sydney
- Trusted Sydney Underpinners
- Over 28 Years Experience
Safe & Hassle Free Service
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Experts in House Underpinning Sydney

Are you looking for house underpinning specialists near you in Sydney? A1 Underpinning can help you.
We have been working with homeowners, builders, owner-builders, engineers, businesses and insurance companies for over 28 years to deliver an unmatched residential and commercial underpinning solution Sydney-wide.
Our professional team combines decades of industry experience and the latest equipment and approaches to efficiently and effectively strengthen your home’s foundations through a variety of techniques including:


- Mass concrete underpinning, deepening and strengthening your foundations
- Beam and base underpinning, spreading the load of your building across your existing foundations
- Mini-pile underpinning
- Soil strengthening
- Excavating and pouring new footings
- Installing piers
- Adding reinforcement
- Waterproofing
Need help undepinning your Sydney home or business? Contact us today.
How We’re Different
We specialise in creating customised house underpinning solutions to suit your home’s unique situation, a service that many other underpinning companies are not offering. What this means for you is that we will be diligent and strategic in choosing the right solution for your circumstances.
Looking to get your house underpinned at affordable rates? Contact us today.
Why Do You Need Underpinning?
Your house foundation is cracked
Doors & windows are jammed and hard to open
Cracks in walls and floors
Your home is built on unstable ground
Your foundations are sinking
You've added an addition to your home
There is water damage around your foundation
You're planning to excavate near your home
Your home is built in the 1980's or before
The home or business is structurally unsound
Why Choose Us
Innovation
We use innovative techniques to ensure all angles of your home foundation are checked coherently.
28 Years
Over 28 years of experience ensuring Sydney home foundations are in top shape & condition.
24/7
OH&S Compliant
We’re professional & responsible business compliant and committed to the OH&S legislation.
Detailed Quote
We offer detailed quotes, outlining the scope of underpinning or foundations repairs required.
Complete Range
Licensed & Insured
A1 Underpinning is licensed and insured and can undertake all facets of underpinning and foundation repairs services.
Custom-Tailored
We specialise in custom house underpinning & structural restoration services suited to your home’s unique situation.
Request A Quote
Dealing with structural or foundation issues? Is your wall & gyprock cracking, are doors jamming, and are there gaps beside windows? We can help. Fill in the form, and we will get back to you as soon as possible.
Client Testimonials
Mark came out on time to provide a quote for a floor levelling and brick pier replacement work. He took his time to explain how the situation may have occurred and options to remedy. Certainly seems to know his stuff. Was able to talk about the modifications that were done to the house from what he was seeing in the foundations. We haven’t proceeded with the works yet, but I know where I’d be heading.

Mark and his team have done two projects at my house. They fixed the sinking floor and helped to fix a disaster project by another tradie. These guys are fantastic! Their quote is reasonable, always comes on time, does a great job and keeps the place clean after themselves. Very professional and experienced, give honest advice and suggest the best approach. I am very happy with the results and will gladly work with them again.

Thanks to Mark & his team for an extremely professional job!!
We were really impressed (as were our neighbours) at the level of care taken especially with regard to access, the tricky nature of the site and for the clean up afterwards. They definitely live up to their name and we would have no hesitation in recommending A1 Underpinning.

Underpinning Sydney FAQs
What is underpinning?
Underpinning is the process of strengthening and stabilising the foundation of an existing structure. This is done by installing supporting materials, such as steel or concrete, underneath the original foundation. Underpinning can be used to repair foundations that have been damaged or weakened over time, or to increase the load-bearing capacity of a foundation so that it can support a new or heavier structure.
Why underpinning is required to a structure?
– To repair a foundation that has been damaged by erosion, water damage, or settlement
– To stabilise a foundation that is showing signs of movement or instability
– To increase the load-bearing capacity of a foundation so that it can support a new or heavier structure
Why is underpinning necessary?
Underpinning is necessary when the existing foundation of a structure is not strong or stable enough to support the weight of the additional structure being built on top of it.
The underpinning process involves installing new, stronger support foundations beneath the existing ones to provide a solid base for the new construction. This is often done by excavating beneath the existing foundation and pouring new concrete footings or piers.
Underpinning is also sometimes necessary when a structure is being renovated or repaired. If the foundations are not in good condition, they may need to be strengthened or replaced in order to support the weight of the structure during the renovation process. In some cases, underpinning may also be necessary to stabilize a foundation that has been damaged by flooding or other natural disasters.
If you’re considering adding an addition to your home or office, or undertaking a major renovation, it’s important to consult with a structural engineer to determine if underpinning will be necessary. The engineer will be able to assess the condition of the existing foundation and determine the best course of action to ensure that the new construction is safe and stable.
How much does underpinning cost?
The cost of underpinning will vary depending on the size and condition of the existing foundation, the type of supporting materials used, and the extent of the work required. However, as a general rule, underpinning can cost anywhere from $5000 to $100,000+.
How long does underpinning take?
The length of time required for underpinning will vary depending on the size and condition of the existing foundation, the type of supporting materials used, and the extent of the work required. However, as a general rule, underpinning can take anywhere from a few days to several weeks to complete.
What are the benefits of underpinning?
Underpinning can strengthen and stabilise an existing foundation, which can repair damage, prevent further damage, and increase the load-bearing capacity of the foundation.
- Cracks in the walls, floors or corners of your building
- Windows and doors wont closed
- Floors or foundations are sinking
- Cracks on your bricks are pretty obvious
- Gaps around door frames are becoming obvious
- Cracks are evident in the wall and floor tiles
- Doors are jammed
- Floors are bouncy
While problems aforementioned may start as an inconvenience, unstable foundations can quickly result in expensive structural damage to your home.
With professional house underpinning, you can rest assured that your home is levelled correctly with stable foundations.
If you think you have unstable, damaged or compromised foundations get in touch with the experts at A1 Underpinning – we’re expert house underpinning and foundation repair specialists in Sydney.
- Sinking Brick Pier Replacement
- Broken or Cracked Wall Repair
- Drainage Repair Solutions
- House Levelling
- Cracked Concrete Repairs
- Jamming Doors and Bouncy Floors
We handle all facets of underpinning services for both residential and commercial. If you need us to assess your property, contact us today.
Apart from underpinning, we offer a wide range of services such as Foundation Repairs, brick repair replacement, house restumping, wall crack repairs, jammed door repairs, concrete crack repairs, house relevelling, bouncy floor repairs, and drainage repairs.
If a foundation is not repaired or stabilised, it may continue to experience damage or movement. This can lead to cracks in walls and floors, doors and windows that won’t close properly, and furniture that appears to be tilted or leaning. In severe cases, a foundation that is not repaired can collapse, resulting in serious damage to the structure above it.
One potential drawback of underpinning is that it can be disruptive to the occupants of a structure while the work is being done. In some cases, it may be necessary to temporarily relocate residents or businesses while the work is being carried out.
Additionally, underpinning can be a complex and expensive process, so it is important to consult with a structural engineer or foundation specialist to determine if it is the best option for your situation. If you are in Sydney and looking for underpinning experts that offer hassle-free, safe, and professional underpinning services, contact A1 Underpinning today.