what is the standard size of a carpet runner
Choose a wider carpet stair runner if you want to protect the majority of the wood surface and provide enough surface area for two people to walk up and down the stairs simultaneously. This Old House recommends a standard stair runner design of 32 inches. This width is available at most hardware stores, home improvement centers and carpet stores. Since most stairs have a 36- to 42-inch width, a 32-inch stair runner still provides 2 to 5 inches of visible wood floor space on either side of the runner.