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.  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.
http://www.homeadvisor.com/cost/flooring/refinish-wood-flooring/
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. Renting a floor buffer and buying needed supplies recoating runs $50-$100. These costs go up the longer it takes to finish the project.
http://home.costhelper.com/refinishing-hardwood-floor.html
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.
http://home.costhelper.com/refinishing-hardwood-floor.html
1 Cost: The cost to refinish the floors is far less than replacing them. The cost to install a wood floor is about $4,000 -- $2,000 more than refinishing.  Age: The age of your floor can be a huge factor, especially if you only installed it a few years ago.
http://www.homeadvisor.com/cost/flooring/refinish-wood-flooring/
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.
http://www.homeadvisor.com/cost/flooring/refinish-wood-flooring/
And engineered hardwood, which has a layer of hardwood over a plywood core, isn’t a much better candidate. Re-sealing and buffingis a much cheaper and more doable DIY project than refinishing. In fact, if you re-seal and buff floors every few years, you may never have to refinish.
https://www.houselogic.com/organize-maintain/home-maintenance-tips/refinishing-wood-floors-yourself/
Take your time. Refinishing your floor can take a week or more. A lot of that time will be spent, well, watching paint dry. Pros will let you know how long to stay away and help you seal up the room, but doing it yourself means you’re on your own. It’s best to wait at least 24 hours before touching the floor after each coat of polyurethane, even if it feels dry. Wear socks — just socks. Shoes, bare feet, and pets can easily ruin all your hard work. So make sure to wear socks during the entire process and for the first 48 hours after the floor is done.
https://www.houselogic.com/organize-maintain/home-maintenance-tips/refinishing-wood-floors-yourself/
However, there's a lot of benefits to refinishing the floors. 1  Cost: The cost to refinish the floors is far less than replacing them. The cost to install a wood floor is about $4,000 -- $2,000 more than refinishing.  Age: The age of your floor can be a huge factor, especially if you only installed it a few years ago.
http://www.homeadvisor.com/cost/flooring/refinish-wood-flooring/
But just because you can rent a sander doesn’t mean you should. Even if your friends did dub you “Jackie-Of-All-Trades” after that amazing bathroom re-do last spring, you still might not have the stuff it takes to refinish your floors.
https://www.houselogic.com/organize-maintain/home-maintenance-tips/refinishing-wood-floors-yourself/
1 The cost to install a wood floor is about $4,000 -- $2,000 more than refinishing.  Age: The age of your floor can be a huge factor, especially if you only installed it a few years ago. You don't want to pull it up because it has as few scratches and start over again.
http://www.homeadvisor.com/cost/flooring/refinish-wood-flooring/
how much does it cost to redo flooring
It costs $340 to $900, and anywhere from $1.50 to $4.00 per square foot to redo flooring. It costs $340 to $900, costing anywhere from $1.50 to $4.00 per square foot for redo flooring.