Finding hardwood under old carpet is one of the best surprises in home renovation. Refinishing can make a worn oak floor look new for a fraction of the cost of replacement. Whether it's a good idea depends on the condition of the wood, how much wood is left above the tongue, and what you want the floor to look like.
Can it be refinished?
Solid hardwood
Solid hardwood, commonly 3/4 inch thick tongue-and-groove oak in our area, can usually be sanded several times over its life. The limiting factor is the amount of wood above the tongue. Look at the edge of a board at a floor vent or threshold to see how much is left.
Engineered hardwood
Engineered floors have a real wood top layer over a plywood or other core. Whether they can be sanded depends on the thickness of the wear layer. Thin wear layers may allow only a light screen-and-recoat or none at all. Check the manufacturer's information if you know the product.
Signs refinishing may not work
- Boards that are cupped, crowned or buckled from moisture
- Deep pet stains that go through the wood
- Boards worn down to the tongue
- Widespread water damage or rot
Damaged boards can often be replaced by weaving in new or salvaged boards, then sanding the whole floor so the patch blends.
Full sand vs screen and recoat
Full sand and refinish
The floor is sanded to bare wood with a series of progressively finer abrasives, edged along walls, then stained (optional) and finished with several coats. This removes scratches, dents in the finish, discoloration and old finish. It's the choice for worn floors, color changes and floors found under carpet.
Screen and recoat
The existing finish is lightly abraded (screened or buffed) and a fresh coat of finish is applied. This refreshes floors with light surface wear while the finish is still intact. It doesn't remove deep scratches or change the color. Floors with wax or certain finishes can't be recoated without special preparation.
Finish options
| Finish | Look | Notes |
|---|---|---|
| Oil-modified polyurethane | Warm, ambers over time | Durable; strong odor during application; longer dry times |
| Waterborne polyurethane | Clear, less ambering | Lower odor; dries faster; commercial-grade products are very durable |
| Hardwax oil | Natural, low-sheen | Penetrates wood; spot repairs are easier; needs periodic maintenance |
| Moisture-cure urethane | Very hard | Strong odor; typically professional use |
Sheen: matte and satin hide scratches and dust better than semi-gloss and gloss. Most homes today choose satin or matte.
Color and stain
Natural (no stain) oak with a waterborne finish stays lighter; oil-based finishes add an amber tone. Stains can take the floor from pale to dark, but dark stains show dust, pet hair and scratches more. Red oak and white oak take stain differently: red oak has a pinkish undertone, white oak tends to be more neutral or slightly green-brown. Always test stain on the actual floor after sanding. For pairing floor and wall color, see floor and wall color.
What to expect during refinishing
- Dust: modern dust-containment sanders reduce dust a lot but not entirely.
- Odor: strongest with oil-based and moisture-cure finishes; plan to be out of the house.
- Time: several days for sanding, staining and multiple coats, plus cure time.
- Cure: finishes are walkable in socks after a short time, but furniture and rugs should wait longer, per the product.
Lead and older homes
Some older floors were painted or finished with products that may contain lead, particularly painted porch floors or stairs, and old baseboards often have lead paint. Sanding those creates hazardous dust. See lead-safe renovation.
Refinish or replace with LVP?
Refinishing usually makes sense when you have solid hardwood in reasonable condition and love the look of real wood. LVP may be the better choice in basements, bathrooms or areas with frequent water exposure, or when hardwood is too damaged. Some homeowners refinish hardwood on the main floor and install LVP in the kitchen, mudroom and basement for water resistance.