Cost to refinish a hardwood floor Calculator. Tell us a li.e about your project size and location and we’ll estimate your costs using trusted, up to date data..The average cost to refinish hardwood floors is $ to $, square feet the average reported size of a kitchen in . That cost can easily rise depending on the specific floors, their condition and extra enhancements..For a basic project in zip code square feet, the cost to Refinish a Hardwood Floor starts at $. $. per square foot*. Actual costs will depend on job size, conditions, size options..Sanding costs are generally around $. per square foot according to the RSMeans Contractor’s Pricing Guide. Some newer wood floors with very li.e wear will not need sanding . Often the refinisher will need to uncover the hardwood floor first. Hardwood floors are often found under carpet, or several decades of old linoleum and tile..