Underpinning is the process of strengthening and deepening an existing foundation that has become unstable, cracked, or insufficient for the structure above it. It's also commonly used to lower a basement floor to create more headroom and living space. At A & A Setting Stone, we specialize in mass concrete underpinning — the most trusted and proven method used across Toronto. Whether your foundation has shifted due to soil movement, age, or a neighboring construction project, our licensed engineers and contractors will assess the situation and restore your foundation's integrity safely and efficiently.