StareCasing Systems makes a patented solid-hardwood overlay system that converts existing or carpeted staircases into finished hardwood stairs without demolition or reconstruction. Its two-piece tread-and-riser system is measured, cut and installed over the existing steps, with standard professional installations taking about six to eight hours. The Columbus company mills both components from genuine natural hardwood rather than veneers, plywood or laminates, and backs them with a 30-year residential material warranty.