Welcome to A1 Underpinning

Who We Are


We’re underpinning and foundation repair experts servicing the residential and commercial sectors in Sydney & surrounding areas.

Back in the early 1990s, four companies led the field in Sydney for foundation repair and house underpinning solutions. A1 Underpinning was born 28 years ago, when these companies joined forces to be better positioned to deliver exceptional foundation and construction solutions to their clients.

The A1 Underpinning reputation has been founded on a commitment to deliver quality workmanship, reliable service and competitive prices to all of their clients. With innovative approaches, modern equipment and decades of combined experience, the A1 Underpinning team is able to create a solution for almost every foundation repair need.

What We Do

What We Do

What We Do

We handle all facets of underpinning, foundation repairs, structural restorations for Sydney homes and businesses. Our specialisations are but not limited to:

  • House Underpinning
  • Foundation Repairs
  • Brick Pier Replacement
  • Wall Crack Repairs
  • Jammed Door Repairs
  • Concrete Crack Repairs
  • House Relevelling
  • House Restumping
  • Bouncing Floor Repairs
  • Drainage Repairs

How We’re Different

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We adhere to OH&S legislation and Australian safety standards. All work is carried out with an absolute commitment to maintaining sites that are safe places for employees, contractors and visitors to carry out business.

Emergencies or urgent projects do not always happen during business hours, however the A1 Underpinning team is available 24 hours a day, 7 days a week to respond to all urgent situations.

For an obligation quote on house underpinning, foundation repair and all our services, feel free to contact Mark today.

How Were Different 2

Why Choose Us

Our Recent Projects

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.

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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.

5 stars
Manish Gupta

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.

5 stars
Evgeny Novikov

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.

5 stars
Lisa McGuinness