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.