Underpinning Melbourne. In construction or renovation, underpinning is the process of strengthening the foundation of an existing building or other structure. Underpinning Melbourne may be necessary for a variety of reasons: The original foundation isn’t strong or stable enough. At Strong Foundation we provide you with the top best services including Foundation Repairs Melbourne, Restumping Melbourne, House relevelling, Concreting, all in good and reasonable price rate. So book your booking and call us 1300 768 533 today.