A worn floor carries layers: the original finish, maybe a recoat or two, old stain, wax from a previous owner, scratches and traffic patterns. Sanding removes those layers in controlled passes until the surface is uniform again.
What sanding involves
- Inspection. We check for protruding nails or staples, loose boards, previous patches and how much wood remains. Engineered floors get a closer look at the wear layer.
- Coarse pass. The first pass removes old finish and levels minor unevenness. Grit choice depends on how heavy the old coating is.
- Edges and corners. A drum or belt sander can't reach walls, so edges are sanded separately and blended with the field. Corners and spots under radiators get hand attention.
- Finer passes. Progressively finer grits remove the scratch pattern of the previous pass. This matters most if stain is planned, because stain exaggerates leftover marks.
- Cleaning. Thorough vacuuming and a final tack before any stain or finish goes down.
Dust and containment
Sanding wood creates fine dust. Machines with vacuum collection capture a large share of it, and we close off the work area, protect openings and vacuum between passes. Even so, some dust escapes, and we won't describe any process as dust-free. If you have particular concerns — a nursery, allergies, open-plan space or forced-air returns in the room — raise them early so we can plan containment around your layout.
When sanding has limits
- Deep stains. Pet urine and long-standing water marks often penetrate past what can be safely sanded. They may lighten but not disappear; replacing boards is sometimes the only full fix.
- Thin floors. Solid hardwood can be sanded repeatedly, but every sanding takes some wood. If previous sandings have exposed nails or the tongue, more sanding isn't wise.
- Engineered wear layers. Some engineered boards have a wear layer thick enough to sand once or more; others are too thin and should only be recoated. We check before recommending anything.
- Uneven subfloors. Sanding smooths the surface but won't correct boards that move or cup because of moisture or structure below.
After sanding
Bare wood is vulnerable, so sanding is always followed by finishing — and, if you choose, by staining first. Sanding and finishing together make up a full hardwood floor refinishing project. If your floor only has a dull or lightly scuffed finish, read refinishing versus recoating before deciding how far to go.
Planning a sanding project
Rooms need to be empty, and you'll want somewhere else to be while machines run. Our preparation guide covers furniture, sequencing and ventilation. For a sense of what shapes the price, see the refinishing cost guide.