Hardwood floors naturally show age, but professional refinishing is necessary when the protective polyurethane finish has worn through, exposing the wood to moisture and dirt. Look for deep scratches, discoloration, or graying wood fibers. If the wood does not bead water on the surface, the finish is likely gone. A professional assessment can determine if the floor has sufficient thickness for sanding.
Ask an ExpertHardwood
What are the standard indicators that a hardwood floor requires professional refinishing?
Indicators that hardwood requires refinishing include significant surface scratching, dullness that cleaning cannot resolve, exposed bare wood in high-traffic areas, or signs of water damage. If the floor's top wear layer is compromised, professional sanding is needed.