Concrete raising is a process used to lift and level sunken or uneven concrete surfaces, such as driveways, sidewalks, and patios. This technique often involves injecting a material, like polyurethane foam or a cement-based mixture, beneath the concrete slab. As the material expands, it fills voids and raises the concrete back to its original position. This method is preferred over complete replacement because it is typically faster, more cost-effective, and less disruptive. Concrete raising can help improve safety by eliminating tripping hazards and can enhance the overall appearance of outdoor spaces.