Hardwood floor restoration

By Wood Floor Report Editorial. Last reviewed August 2026. How we research this.

In brief

Wood floor restoration and refinishing are two different jobs

The two words get used as if they meant the same thing. They do not, and the price gap is the reason to know the difference before anyone quotes you.

A refinish is one operation. The National Wood Flooring Association defines it as sanding a previously finished floor to bare wood and applying new stain or finish. It assumes the boards underneath are sound. Nationally it runs $3 to $8 per square foot, a range NerdWallet, HomeAdvisor, and This Old House all publish. The machines and grits behind it are covered at sanding.

A restoration is that same refinish with repair work in front of it. Failed boards come out and new ones go in at $4 to $10 per square foot including materials and labor, per Fixr. Deep scratches, gouges, and loose floorboards must be repaired before the refinishing process begins. And This Old House prices that pre-work at $6 to $12 per square foot. Then the whole floor, old boards and new, is sanded flat and finished as one surface. That final sand is what makes a restoration look like one floor instead of a floor with patches. It is also why Inch Calculator's spot repair price includes matching stains: a new board does not disappear until it is sanded and finished with its neighbors.

What restoration costs, piece by piece

Method: each publisher's own national cost guide, read 2026-08-28. These are national ranges, not quotes. Repair pricing in more depth is at wood floor repair cost; run your footage through the calculator for the refinishing side.

Read the table from the bottom up. The refinish band, $3 to $8 per square foot, is the bill every restoration pays no matter what. The repair lines stack on top of it, and they range from trivial to brutal. A scratch is $1 to $8 per square foot. Water damage is $8 to $100. Rot is $50 to $250, which is not repair money anymore. The spread between Fixr's $2,000 repair average and HomeAdvisor's $1,077 is real. And it mostly reflects how much of the floor is hurt. That is why no honest page can quote a single restoration number: the job is a sum. And the repair half of the sum is the variable.

Old-house floors: count the wood before you plan the work

Every sanding spends wood, and an old floor has usually been spending for decades. A brand new 3/4 inch solid floor has about 1/4 inch of wood above the groove, per Uptown Floors. And that is the entire lifetime budget. A professional sand removes less than 1/32 inch, per NOFMA guidance carried by the National Wood Flooring Association. Trade refinishers put the working range at 1/32 to 1/16 inch per full sand, per Just Around the Corner Flooring of St. Louis, whose guidance lands around six to eight sandings in many cases. NWFA itself says there is no fixed number. It depends on the contractor's skill, the equipment, the wear layer, and the floor's flatness and condition. The same St.

Louis refinisher notes that cupping, pet stains, and lippage force heavier sanding than a normal pass. So a floor with problems spends its budget faster. A century-old floor may be on its last pass, or past it.

Two checks tell you where the budget stands. Pull a floor vent cover and sight the exposed board edge, a check Uptown Floors describes: it shows the tongue and groove profile and how much wood earlier sandings took. And know the two hard stops. Carpet Trends of Rye, NY puts the minimum at 3/32 inch of wood above the tongue to refinish safely. Uptown Floors states the other limit plainly: the floor cannot be sanded successfully below the tongue and groove area without exposing the nails that hold it down. Nail heads showing means the sanding account is closed. The full count-by-count math is at how many times can floors be refinished.

Old wood is often soft wood

Age also changes what the floor is made of. Many old American floors are pine, not oak. On the USDA Forest Products Laboratory's Janka hardness scale, eastern white pine measures 380 pounds-force and longleaf pine, the antique heart pine of old Southern homes, measures 870, against 1,290 for northern red oak and 1,360 for white oak. Softer boards dent and wear faster, yet pine is not easier to sand: Ben Osborne of How To Sand A Floor warns that pine sands as hard as oak because it is more fibrous and resilient. The cost guides see the difference too. NerdWallet prices refinishing pine at $4 to $7 per square foot against $3 to $5 for oak and $6 to $8 for maple. What each species wants from a refinish is at wood species.

Painted floors and the 1978 line

This is the safety section of the page, and it stays out of any fold. The federal government banned lead-based paint for homes in 1978, per EPA. Before that year the odds run high: EPA's figures say homes built before 1940 are 87 percent likely to have lead-based paint, homes from 1940 to 1959 are 69 percent likely. And homes from 1960 to 1977 are 24 percent likely. Approximately three-quarters of all pre-1978 US homes still contain some. Old houses are exactly where painted floors, painted borders, and painted stair treads live. So restoration work walks straight into this rule.

The rule is EPA's Renovation, Repair and Painting (RRP) rule. And its starting position is presumption: in covered pre-1978 buildings, lead-based paint must be assumed present unless testing, with an EPA-recognized test kit or lab analysis of paint chips, shows the affected parts are lead-free. Anyone paid to disturb paint in pre-1978 housing must be certified in lead-safe work practices, including sole proprietorships. Certification means an eight-hour training course, recertification every five years, and records kept three years. On the job, a certified firm must contain the work area so no dust or debris leaves it, clean up with HEPA vacuuming or wet cleaning. And finish with a cleaning verification.

The part aimed straight at floor work is the prohibited-practices list. Power sanding, grinding, planing, needle guns, and abrasive blasting of paint are prohibited unless the machine has a shroud or containment system with a HEPA vacuum attachment collecting dust at the point of generation. A drum sander run bare over lead paint violates this. So does open-flame burning of paint, or a heat gun above 1,100 degrees Fahrenheit.

The six square foot exemption, and how it voids

The RRP rule has a minor repair and maintenance exemption: work that disturbs six square feet or less of paint per room inside, or 20 square feet or less on the exterior. Two things to know before leaning on it. First, the exemption is void if the job uses any prohibited practice, window replacement, or demolition, and floor sanding machines without shrouded HEPA capture are a prohibited practice on paint. Second, jobs in the same room within the same 30 days count as one job. So a floor cannot be sanded six square feet at a time. A whole painted floor is far above the threshold either way. For hired restoration work on a painted pre-1978 floor, assume the full rule applies.

Homeowners get a different deal. The RRP rule generally does not apply to people working on their own pre-1978 home, with exceptions EPA names: renting out part of the home, running a childcare business in it, or buying, renovating, and selling homes for profit. The exemption does not make the dust safe. EPA's own advice for anyone disturbing old paint: renovation that disturbs painted surfaces in older homes can create large amounts of lead dust. So if you must sand, wet the area first, sand the minimum area needed, and clean up thoroughly. The cheaper move is the test, before any machine touches the floor.

When boards are past saving

A board is past saving when fixing it costs more than replacing it. And the repair table shows exactly where that happens. Scratch repair at $1 to $8 per square foot is worth doing almost every time. Water damage at $8 to $100 per square foot is a case-by-case call: one stained board is a $4 to $10 per square foot replacement, while a whole darkened floor edge is a different conversation. Rot at $50 to $250 per square foot is the clear line. At that price you are paying more per foot than new flooring costs, and rot means moisture reached the wood and stayed there. So the cause needs fixing before any new board goes in.

The wood budget draws the other line. Below 3/32 inch above the tongue, per Carpet Trends, a solid floor should not be sanded again. With nail heads showing, per Uptown Floors, it cannot be. Engineered floors reach this point sooner: NWFA's published rule is that a wear layer under 2.5 mm (3/32 inch) should not be sanded at all. A floor in this state can still be recoated and maintained, sometimes for years. But it cannot be restored in the full sense. The reason: restoration ends in a sand it cannot afford. NerdWallet's verdict that refinishing is almost always cheaper than replacement holds only while the boards can hold a refinish. When too many boards fail the test at once, the honest comparison is at refinish or replace.

Gaps, movement, and what this page will not price

Old floors have gaps, and most gaps are movement, not failure. Wood takes on and gives up moisture until it matches its environment. NWFA's guidance keeps wood floors at 60 to 80 degrees Fahrenheit and 30 to 50 percent relative humidity. And its acclimation articles treat a floor as settled only when its moisture readings match the home. Boards shrink as the air dries and swell as it dampens. That is the mechanism behind gaps that open and close with the seasons. Some species move more than others: hickory exaggerates the effects of temperature and humidity more than other species, per an inspector's report in NWFA's Hardwood Floors Magazine.

One honest limit: we could not verify a national gap-filling price against a source we actually read. So this page does not print one. Ask the contractor quoting your restoration to price gap work as its own line. And be suspicious of filler promised for gaps that change with the seasons, since a filled gap that closes in summer has nowhere to go. Fixed structural symptoms, loose boards among them, belong in the repair pre-work This Old House prices at $6 to $12 per square foot.

The decision: restore, refinish, or accept and maintain

Method: our judgment, applied to the sourced figures on this page. National figures. Your quote will differ.

The recommendation, plainly. If the damage is local and the wood budget holds, restoration is the best money on this page: for the cost of a repair line plus the refinish everyone in the market pays anyway, an old floor comes back as one surface with decades left in it. If nothing is broken, refinish and keep the difference. And if the floor cannot afford another sand, maintenance is not defeat: a recoat every few years keeps a thin old floor working long past the point a sander would have ended it.

You may not need a restoration at all

Most floors that look terrible are not damaged. They are worn. If no boards are failing and nothing reaches bare wood, the job is a refinish at $3 to $8 per square foot, with no repair bill in front of it. If the finish is merely dull and was never waxed, the job is smaller still: a screen and recoat, where a buffer scuffs the old finish and a fresh coat of polyurethane goes over it, at $1 to $2.50 per square foot for the screening plus $1 to $2 for the recoat, $2 to $4.50 combined by our addition of Fixr's two lines.

The Flooring Girl's guidance is that screening every three years or so postpones a full sanding for a very long time. That for an old floor with a thin wood budget is not a compromise but the strategy. The walkthrough is at screen and recoat, and the symptom checklist that separates worn from damaged is at signs you need refinishing.

We can point you at the smaller job because we do not sell flooring and we do not refinish floors. This site connects homeowners with licensed contractors. When a $2 to $4.50 screen and recoat is what your floor needs, that is what this page says.