Hardwood floor refinishing cost dataset

Sandable depth and how many sandings

Solid three-quarter-inch boards carry about 6 mm above the tongue. Engineered boards carry their veneer less a 1 mm margin that is never taken, because reaching the glue line ends the floor. Divide by 0.8 mm per sanding and round down.

⚠️ The two constants are declared estimates and they are the load-bearing ones on this page: 6 mm above the tongue and 0.8 mm per sanding, which is a thirty-second of an inch. A light screen-and-recoat takes far less and is not modelled here at all. What is not an estimate is the shape of the finding: a 0.6 mm veneer cannot survive a drum sander, and it is indistinguishable from a floor that can once it is laid. Measure at a vent cut or a doorway before anybody quotes.

Area, hours and the rate per square foot

The rate falls with area because clearing the rooms, the dust containment and the machine set-up do not scale — which is why a single room is the most expensive floor per square foot anybody buys. Refinishing this reference floor is $4,743 against $6,728 to tear it out and lay vinyl plank from our vinyl plank dataset at the same national wage — 70%.

Condition, finish and the extras

⚠️ The staircase is worth $1,067 on its own — more than staining the entire floor — because treads cannot be machine-sanded and every one is over an hour of hand work. Per square foot a staircase costs several times the floor it leads to, and it is the line people are most surprised by.

Line items

25% of the reference total comes from estimated rather than official figures. The reference floor is 800 square feet of solid wood sanded once before, in normal condition, 3 passes, water-based finish: 62.4 trade hours and 6 sandings left afterwards.

The reasoning behind each figure

Abrasives and edging discsestimated, ±36%

• Belts and discs for each grit in the sequence, plus the edger. Consumed, not reused.
• ⚠️ Worn abrasive is the hidden cause of a poor job: it stops cutting and starts burnishing, which looks fine bare and shows up as patchy absorption the moment the finish goes on. A crew changing paper often is a crew doing it properly.

Sanding: drum, edger and buffer

• About 0.014 hours per square foot per pass. Two passes on a floor that only needs the finish taken off, three on a normal one, four where the damage is deep.
• ⚠️ Multiplied by 1.3 on engineered wood. Over six millimetres of solid timber a drum sander works at a normal pace; over a two or three millimetre veneer there is no margin at all, so the work drops to less aggressive machines, more passes with less cut, and constant checking. Going through a veneer has no remedy.
• ⚠️ The passes are not padding: each grit exists to remove the scratches of the one before it. Jumping from coarse straight to fine leaves the coarse marks in the wood, invisible until the finish goes on and then permanent.
• The edger and the corner scraper are slow work at the perimeter, which is why a room full of alcoves costs more than its area suggests.
• Increased by 35% in a pre-1978 house, where sanding next to painted skirting brings the job inside the federal lead programme.

Test cut to identify what the floor is

• Half an hour: lifting a vent or cutting a small sample at an inconspicuous edge to see what is under the finish, before any machine touches the floor.
• ⚠️ Nobody in the trade puts a drum sander on a floor they cannot identify, so this happens whether or not it appears on an invoice. It is priced here because it is real work, and it is small on purpose: you can do exactly the same check yourself in five minutes for nothing, by lifting a floor vent.

Dust containment and extractionestimated, ±56%

• Sheeting over doorways, taped vents, and the consumables for a vacuum-assisted sander.
• Wood dust is a recognised occupational hazard and, in enough quantity, a fire risk. It is also the difference between a house you can live in during the work and one you cannot.
• ⚠️ "Dustless" is a marketing word rather than a standard. It means vacuum-assisted, which is a real improvement and is not the same as no dust.

Stain, applied and wipedestimated, ±43%

• Material only; the hours are in the staining line. Adds a full working day to the schedule before any finish can go on.
• ⚠️ Always ask for a sample panel on your own floor rather than choosing from a card. The same stain reads completely differently on red oak, white oak and maple, and maple in particular blotches unless it is conditioned first.

Applying and wiping the stain

• About 0.006 hours per square foot. Applied and wiped back within minutes across the whole floor, which is why it is done by a crew rather than one person on a large area.

Oil-based polyurethane finishestimated, ±30%

• Oil-based polyurethane, three coats. The cheapest of the three per square foot and the hardest wearing.
• Priced per square foot for 3 coats, which is what this finish takes.
• Coverage is around 500 square feet per gallon per coat on sanded wood, which is thirstier than a wall because bare timber drinks the first coat.

Water-based polyurethane finishestimated, ±30%

• Water-based polyurethane, three coats. Dearer material, dries clear, and the house is usable far sooner.
• Priced per square foot for 3 coats, which is what this finish takes.
• Coverage is around 500 square feet per gallon per coat on sanded wood, which is thirstier than a wall because bare timber drinks the first coat.

Hardwax oil finishestimated, ±31%

• Hardwax oil, two coats. Dearest per square foot here, and the only one of the three that can be repaired in place later without sanding the whole room.
• Priced per square foot for 2 coats, which is what this finish takes.
• Coverage is around 500 square feet per gallon per coat on sanded wood, which is thirstier than a wall because bare timber drinks the first coat.

Buffing between coats and applying the finish

• About 0.009 hours per square foot per coat, including the screen between coats and the tack-off before each one.
• The coats are the schedule, not the work: each has to cure before the next, so a three-coat floor is a multi-day job whatever the crew size.

Replacing damaged boardsestimated, ±54%

• Cutting out a board without damaging its neighbours, matching species and cut, and weaving the new one in — material and the extra hands, per board.
• ⚠️ Matching is the hard part rather than the fitting. New wood is a different age and takes stain differently, so a replaced board is usually visible until several years of light have evened it out. Boards taken from a closet floor match far better than boards bought new.

Sanding and finishing stair treads

• About 1.4 hours per tread. Stairs cannot be machine-sanded: every tread, riser, nosing and the stringer beside it is done by hand.
• ⚠️ Per square foot, a staircase is several times the cost of the floor it leads to. It is also the most-worn wood in most houses, so it is the part people most want done — and the line that surprises them in the quote.

Clearing, protecting and reinstating

• Furniture out, shoe moulding off, nails punched below the surface, vents lifted, and all of it back at the end.
• ⚠️ A protruding nail head destroys a drum belt instantly and gouges the floor on the way, so punching them is not optional. The shoe moulding comes off because the edger cannot reach under it, and refitting it afterwards hides the last quarter inch.

Lead-safe containment and cleaning verificationestimated, ±55%

• Sheeting, HEPA vacuum consumables and cleaning verification wipes.
• ⚠️ Floors themselves are rarely lead-painted, but skirting and door casings in a pre-1978 house very often are, and an edger runs within an inch of them for the whole perimeter. That is disturbance of painted surface, and it puts the job inside the federal programme.

Not included in this dataset

Screen and recoat

Abrading the old finish and adding a fresh coat is a different and far cheaper job, and on a floor whose wood is still sound it is frequently the right one — not least because it uses none of the remaining thickness. It is worth asking for by name before accepting a quote for a full sanding.

Fixing why the floor is cupped

Cupping is moisture arriving from below or from a leak. Sanding a cupped floor flat before it has dried produces a crowned floor when it does. The moisture has to be found, fixed and given time first, and none of that is priced here.

Black pet stains

The staining has reacted with the tannins through the full thickness of the board. Sanding does not reach it. Those boards are replaced or they stay dark, and which one you choose is a conversation to have while looking at the floor.

Subfloor repairs and squeaks

A springy or noisy floor is a fastening or joist problem underneath the boards. Refinishing changes the surface and nothing else.

Skirting, shoe moulding and thresholds

Taking the shoe moulding off and putting it back is priced. New moulding, new thresholds or repainting the skirting afterwards are separate work — our interior painting page covers the last of those.

Somewhere to live during the work

A finished floor cannot be walked on for a day or more and furniture waits longer. Whether that means a hotel, staying with family, or living in half the house is a real cost of this project and not one we can price.