The short answer
Pros charge by the square foot of floor. A full sand-and-refinish costs $3–$8 per square foot. Angi says that covers the whole job, including sanding, staining and finishing. A screen and recoat, which only freshens the top coat, costs $1–$2.50. About 80% of the price is labor.
In plain English: if the wood is sound, refinishing makes an old floor look close to new. In the example below it costs about a third to a half of what new oak costs for the same floor. If the floor is only dull, a recoat may be all it needs. Replace it only when the boards are rotten, badly warped, or too thin to sand again.
A worked example, start to finish
Say you have 500 square feet of solid oak. It is worn through in the hallway. You want it sanded to bare wood, stained one color, and coated twice with water-based finish by a pro. These are the calculator's default settings, so you can check every number.
- Sanding, stain and finish: 500 × $3 = $1,500 at the low end, and 500 × $8 = $4,000 at the high end. Angi says its $3 to $8 includes staining, so the stain is not added on top.
- Total: $1,500 to $4,000, or $3.00 to $8.00 per square foot. The middle is $2,750. That middle figure is our own midpoint, not a published number.
- Replacing the same floor with new #1 common oak, nailed down, with the old floor taken out: $4,160 to $7,820. That figure comes from our hardwood floor installation calculator at the same size.
- Doing it yourself: one day of drum sander and edger rental comes to $85 to $125 at This Old House's rates. Finish, stain and sandpaper are extra.
Full sand or screen and recoat?
| Job | What happens | Fixes | Per sq ft (pro) |
|---|---|---|---|
| Screen and recoat | The old finish is scuffed with a buffer and one new coat goes on. | Dull finish, light surface scratches | $1–$2.50 |
| Sand and refinish | The floor is sanded to bare wood, then coated two or three times. | Worn paths, deep scratches, stains, a color change | $3–$8 |
| Dustless sand and refinish | The same, with the sanders hooked to a strong vacuum. | The same, with far less dust in the house | $5–$8 |
A recoat only adds finish on top of finish. Where people have walked through to bare wood, the grey paths will still show under the new coat.
How many times can a floor be sanded?
Solid hardwood is one piece of wood all the way through. The NWFA (National Wood Flooring Association, the trade group) says most solid floors can be sanded six to eight times. Each sanding takes off about 1/32 to 1/16 of an inch.
Engineered hardwood is a thin layer of real wood glued on plywood. That top layer is called the wear layer. The NWFA says wear layers run from 1/16 to 1/4 of an inch, and that sanding is not recommended when it is thinner than 3/32 of an inch (about 2.4 mm). If you do not know your wear layer, ask a refinisher to check before any sanding starts.
Picking a finish
| Finish | What it is like | Material price |
|---|---|---|
| Water-based polyurethane | A clear polyurethane coat that is thinned with water. | $25–$55 a gallon (Angi); $30–$55 (Fixr) |
| Oil-based polyurethane | A clear polyurethane coat that is thinned with oil. Thumbtack says it takes two to three coats. | $20–$45 a gallon (Angi); $20–$50 (Fixr) |
| Hardwax oil | An oil-and-wax blend that soaks into the wood instead of sitting on top. | $70–$550 a gallon (Fixr) |
No publisher prints a different labor price for each finish, so the calculator's pro price is the same for all three.
When to replace instead
- Boards are soft, rotten or black from water underneath.
- Boards have cupped (edges higher than the middle) or crowned badly.
- Nail heads or tongues show through the top: the floor has been sanded too often.
- An engineered floor's wear layer is under 3/32 of an inch.
A few bad boards do not mean a new floor. Pros cut them out and weave in new ones for $6–$12 per square foot (Angi and This Old House), then sand the whole floor so it matches. If you do need new flooring, compare hardwood with the LVP flooring calculator and the laminate flooring calculator.
Doing it yourself
Doing it yourself saves the labor, which Angi and Fixr put at about 80% of a pro's price. You rent the machines and buy the finish.
- Drum sander: $50–$80 a day (This Old House; Fixr prints $50–$70).
- Edger, for the edges the drum sander cannot reach: $35–$45 a day (This Old House).
- Finish: Angi prints $25–$55 a gallon for water-based polyurethane and $20–$45 for oil-based.
You also need sandpaper and a floor buffer. We could not read a dated rental rate for a buffer, so it is not in the calculator. This Old House puts a whole DIY job at $500 to $1,000.
Questions to ask a refinisher
- Is the price per square foot? Are stairs, closets and repairs extra?
- How many coats, and which finish brand?
- Do you use dustless sanding? What does it add?
- Will you test a stain sample on my floor first?
- How long until we can walk on it, and put furniture back?
- For engineered floors: did you check the wear layer is thick enough?
Where the publishers disagree
- Full refinish: Angi, Fixr and This Old House all print $3–$8 per sq ft. Homewyse prints $6.49–$7.92 for two sanding passes and two coats. The calculator uses the $3–$8 band the three agree on.
- Board repair: Angi and This Old House print $6–$12 per sq ft. This Old House repeats Angi's data, so that is one source. Fixr, a separate publisher, prints a much wider $8–$32. The calculator uses Angi's band and says so in the step.
- Dustless sanding: Angi prints $5–$8 per sq ft (This Old House repeats it). Fixr prints $6–$8, inside that band, so the calculator uses $5–$8.
- Stairs: Fixr prints $25–$45 per step. Thumbtack prints $80–$140. The calculator shows the whole span, $25 to $140, rather than pick one.
Methodology
- All cost figures are US national and come from the sources below, each read on 17 October 2026. The cost guides are secondary sources. Fixr's page is dated January 2025; the others were updated in 2026.
- The pro price is square feet times the band for the job, plus board repair and stairs if chosen. Stain is not added on top: Angi says its $3–$8 band covers sanding, staining and finishing. “Typical” is the midpoint of low and high and is our own figure.
- Finish type and number of coats do not change the pro price. No publisher prints a premium for either; two or three coats are part of the published band.
- The replace figure is our hardwood floor installation calculator at the same size, with #1 common oak, nail-down, prefinished boards and old-floor removal. It is a national figure.
- No publisher prints a regional price for refinishing. The metro option uses federal wage data for floor layers (U.S. Bureau of Labor Statistics, May 2025), applied to the 80% labor share only. Metros without a published wage are left out, not guessed.
- Do-it-yourself rental rates are This Old House's (updated 5 June 2026, read 17 October 2026). One rental day per 500 square feet is our assumption, not a published figure. Finish, stain and sandpaper are not priced.
Sources
- Angi — Hardwood Floor Refinishing Cost (updated 3 Aug 2026; secondary cost guide). https://www.angi.com/articles/hardwood-floor-refinishing-cost-and-other-factors.htm Read 2026-10-17.
- HomeAdvisor — Refinish Wood Flooring cost guide (updated 20 Jun 2026; same company as Angi; secondary). https://www.homeadvisor.com/cost/flooring/refinish-wood-flooring/ Read 2026-10-17.
- Fixr — Hardwood Floor Refinishing Cost (updated 31 Jan 2025; secondary cost guide). https://www.fixr.com/costs/hardwood-floor-refinishing Read 2026-10-17.
- This Old House — Cost to Refinish Hardwood Floors (updated 5 Jun 2026; credits Angi, Fixr and The Home Depot; secondary). https://www.thisoldhouse.com/flooring/cost-to-refinish-hardwood-floors Read 2026-10-17.
- Thumbtack — Cost to Refinish Hardwood Floors (updated 8 Jul 2026; secondary). https://www.thumbtack.com/p/cost-to-refinish-hardwood-floors Read 2026-10-17.
- Homewyse — Cost to Refinish Hardwood Floor (May 2026 data; secondary). https://www.homewyse.com/services/cost_to_refinish_hardwood_floor.html Read 2026-10-17.
- NWFA, Hardwood Floors magazine — How Many Times Can a Wood Floor Be Sanded? (Brett Miller, 1 Apr 2025). https://hardwoodfloorsmag.com/2025/04/01/how-many-times-can-a-wood-floor-be-sanded/ Read 2026-10-17.
- U.S. Bureau of Labor Statistics — Occupational Employment and Wage Statistics, May 2025 (floor layers), as stored in the site's metro wage table. https://www.bls.gov/oes/tables.htm
Related calculators
Replacing the floor after all? Price new wood on the hardwood floor installation calculator, or compare cheaper floors on the LVP flooring calculator and the laminate flooring calculator.
Frequently asked questions
How much does it cost to refinish hardwood floors?
A full sand-and-refinish costs $3–$8 per square foot. Angi, Fixr and This Old House all print that band, and Angi says it covers the whole job, including sanding, staining and finishing. For 500 square feet, sanded, stained and coated by a pro, this calculator gives $1,500 to $4,000, with $2,750 as its own midpoint.
Is it cheaper to refinish or replace hardwood floors?
Refinishing is much cheaper when the boards are sound. Replacing the same 500 square feet with new #1 common oak, nailed down, with the old floor taken out, comes to $4,160 to $7,820 on our hardwood installation calculator, against $1,500 to $4,000 to sand, stain and refinish it. Replace only when boards are rotten, badly cupped, or sanded too thin.
What is a screen and recoat, and what does it cost?
A screen and recoat (also called buff and coat) scuffs the top of the old finish with a buffer and adds one fresh coat. It does not sand to bare wood. Angi, Fixr and This Old House price it at $1–$2.50 per square foot. It works when the finish is dull or lightly scratched, not when wear has gone into the wood.
How many times can hardwood floors be refinished?
The NWFA, the wood flooring trade group, says most solid wood floors can be sanded six to eight times. One sanding removes about 1/32 to 1/16 of an inch. Engineered floors depend on the top layer of real wood: the NWFA says sanding is not recommended when it is thinner than 3/32 of an inch (about 2.4 mm).
How much does dustless sanding cost?
Angi prices dustless sanding and refinishing at $5–$8 per square foot, and This Old House repeats Angi's figure. Fixr, a separate publisher, prints a slightly narrower band inside it. A standard sand is $3–$8. The sanders are hooked to a strong vacuum, so far less dust gets into the rest of the house.
Can I refinish hardwood floors myself?
Yes. This Old House puts a whole DIY refinish at $500 to $1,000. Its rental rates are a drum sander at $50 to $80 a day and an edger at $35 to $45 a day, so one day of both for a 500 square foot floor is $85 to $125. Finish, stain and sandpaper are on top of that.
Does the type of finish change the price?
Not much for a pro job. Publishers print finish prices per gallon only: Angi lists oil-based polyurethane at $20 to $45 a gallon and water-based at $25 to $55. Labor is about 80% of the bill (Angi, Fixr), so the finish is a small part. Fixr lists hardwax oil at $70 to $550 a gallon. This calculator does not change the pro price by finish.