Question: how much does it cost to stain hardwood floors darker?
Answer: This will typically cost $1 per square foot, or $225. For a custom refinish job involving sanding the hardwood flooring, and applying stains, water-based or oil-based finishes, and other finishes like those that are acid-cured, expect to pay $3.75 to $5 per square foot, or $850 to $1,125.