While some treadmills are more likely to damage your floor than others, it’s always a good idea to use a treadmill mat between your floor and your machine to prevent damage. A treadmill mat is roughly ¼-inch thick and dense enough to protect your floor from scratches and dents.
Additionally, a treadmill should always be set up on a level surface. Use a level to ensure that your floor surface is level. An uneven surface can affect your running or walking form, and it can also lead to floor damage.