1 Do-it-yourselfers intent on completely refinishing a 225-square-foot floor can rent a commercial sander, also called a drum sander, and buy other needed materials for about $125-$225. 2  Renting a floor buffer and buying needed supplies recoating runs $50-$100. 3  These costs go up the longer it takes to finish the project. 1 Typically this takes about a day or two, and restores a floor that's in relatively good condition. 2  Expect to pay $340-$900 (about $1.50-$4 a square foot) to completely refinish a 15x15 foot room. 3  That generally includes sanding down to the bare wood and applying at least 2 and sometimes 3 coats of finish. 1 Cost: The cost to refinish the floors is far less than replacing them. 2  The cost to install a wood floor is about $4,000 -- $2,000 more than refinishing. 3  Age: The age of your floor can be a huge factor, especially if you only installed it a few years ago. 1 The cost to install a wood floor is about $4,000 -- $2,000 more than refinishing. 2 Our free calculator uses recent, trusted data to estimate costs for your Hardwood Floor Refinishing project. For a basic 125 square feet project in zip code 47474, the benchmark cost to Refinish a Hardwood Floor ranges between $3.79 - $4.87 per square foot* . To estimate costs for your project: 1. Set Project Zip Code Enter the Zip Code for the location where labor is hired and materials purchased. 2. 1 Refinishing stairs can add about $25-$45 per step to the total cost. 2  Severely damaged floors may need boards replaced, cracks sealed, stains bleached or other repairs before being refinished; the cost will depend on how extensive the problems areas are. 1 Typically this takes about a day or two, and restores a floor that's in relatively good condition. 2  Expect to pay $340-$900 (about $1.50-$4 a square foot) to completely refinish a 15x15 foot room. 3  That generally includes sanding down to the bare wood and applying at least 2 and sometimes 3 coats of finish. 1 The cost of refinishing an average 15x15 (225 square feet) room is $340 to $900, costing anywhere from $1.50 to $4.00 per square foot. 2  Quality of previous finish: The finish that is currently on the hardwood floors can be a major factor in the work required to refinish or recoat the floors. 1 The cost to install a wood floor is about $4,000 -- $2,000 more than refinishing. 2  Age: The age of your floor can be a huge factor, especially if you only installed it a few years ago. 1 Expect to pay $340-$900 (about $1.50-$4 a square foot) to completely refinish a 15x15 foot room. 2  That generally includes sanding down to the bare wood and applying at least 2 and sometimes 3 coats of finish. 1 Typically this takes about a day or two, and restores a floor that's in relatively good condition. 2  Expect to pay $340-$900 (about $1.50-$4 a square foot) to completely refinish a 15x15 foot room. 3 As with any home improvement project, the cost of refinishing hardwood floors varies based on location, floor material, floor condition and other factors. The average cost to refinish hardwood floors is $970 to $1,250 per 300 square feet -- the average reported size of a kitchen in 2012. That cost can easily rise depending on the specific floors, their condition and extra enhancements. 1 The cost to install a wood floor is about $4,000 -- $2,000 more than refinishing. 2  Age: The age of your floor can be a huge factor, especially if you only installed it a few years ago. 1 The price range can jump to $850-$1,125 (around $3.75-$5/square foot) or more for a refinishing specialist to do a customized job on a 225-square-foot vintage wood floor, using multiple coats of chemicals, stains and other finishes to create just the right look. 1 Typically this takes about a day or two, and restores a floor that's in relatively good condition. 2  Expect to pay $340-$900 (about $1.50-$4 a square foot) to completely refinish a 15x15 foot room. 3  That generally includes sanding down to the bare wood and applying at least 2 and sometimes 3 coats of finish. Video on the cost of concrete floors. Depending on the level of complexity, concrete floors can cost as little as $2 to $6 a square foot or be as expensive as $15 to $30 a square foot. 1 Extensive surface preparation, such as grinding, crack repair, and spall repair, can add as much as $2 per square foot to the overall cost of the floor. 2  If a full resurfacing is needed, expect to tack on another $2 to $3 per square foot (for a $4 to $5 per square foot increase). As an indication, a wood floor sanding cost can range from £9 to £12 per square metre for large areas and moving up in price per square metre for smaller areas. Smaller, one or two rooms can range from £15 to £20 per metre depending on the details of the work. 
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