If you've never had floors sanded before, it genuinely helps to know what the process actually involves, and just as importantly, what a properly finished result should look like once it's done.
What A Good Contractor Checks Before Starting
A proper assessment happens before any machine touches the floor:
- Raised nails get punched down, since a proud nail head can damage a sanding drum.
- Loose boards, cupping, or other movement get identified and addressed before sanding starts, not discovered partway through.
- Board thickness is checked, particularly on older properties. This is worth knowing specifically: in properties built before the 1940s, original boards can sometimes be worn down close to the tongue-and-groove joint itself. Sanding too aggressively at that point risks exposing the tongue and genuinely destabilising the board. A good contractor identifies this risk beforehand rather than sanding through it.
Clearing And Protecting Your Home
- Clear the room completely, most contractors move light furniture as part of the job, but heavy items like pianos or large wardrobes are usually your responsibility.
- Remove any rugs from the work area.
- Doorways get sealed off, typically with plastic sheeting, to limit dust movement through the rest of the property.
The Sanding Process, Briefly
The short version: a belt sander handles the main floor area, an edger works the perimeter, and the whole thing moves through progressively finer grits, coarse to remove the old finish, then medium and fine to smooth the surface fully. We've covered the specific grit progression and technique in genuine depth elsewhere, worth a read if you want the full technical breakdown.
Dust Control
Professional equipment now captures up to 99% of particles at the source, considerably less disruptive than older methods and genuinely healthier for everyone in the property. The floor still gets a thorough vacuum and wipe-down before any finish goes on, even with good extraction.
Choosing A Finish
Once sanded, the floor's ready for its finish. Options generally include hard-wax oils (Osmo being a well-known choice), lacquer from established brands like Bona, Loba, or Junckers, and staining before the topcoat if you want a specific colour. Grey and whitewashed tones have grown in popularity recently, though natural and lightly oiled finishes remain the most commonly chosen option.
What A Properly Finished Floor Should Actually Look Like
This is worth knowing so you can genuinely judge the result yourself, not just take it on trust:
- Smooth and uniform in sheen across the whole room, no patchy areas or visible transitions between the drum-sanded centre and the edger-sanded perimeter.
- No visible scratches or lap marks, the faint overlapping lines a poorly executed sanding pass can leave behind.
- Clear, even grain, consistent across the floor rather than looking uneven in places.
- Solid underfoot, with no spring or movement. Any boards that were loose before sanding should have been secured as part of the job, not left as-is.
- Gaps between boards may still be visible, particularly in older properties where boards have dried and shrunk over decades, but a good contractor can address these with proper gap filling if you want a tighter finished look.
Living Around The Project
Worth planning for rather than discovering mid-project: you'll need somewhere else to sleep if bedrooms are being worked on, and you won't be able to use the kitchen while a hallway leading to it is drying. A good contractor can advise on the best sequence for a whole-property job specifically to minimise this kind of disruption.
Aftercare
Once cured, a well-finished floor holds up for years with basic care, felt pads under furniture, avoiding dragging heavy items, and cleaning with a slightly damp mop rather than a soaked one. In homes with underfloor heating, keeping the system at a consistent temperature helps minimise unnecessary board movement over time.
What To Expect From Hardwood Floor Sanding: Common Questions
How do I know if my floor's original boards are too worn to sand?
A proper assessment before work starts should identify this, particularly in pre-1940s properties where boards can be worn close to the tongue-and-groove joint. A good contractor flags this risk rather than sanding through it.
What does a poorly finished sanding job look like?
Visible scratches or lap marks, an uneven sheen, a noticeable seam between the centre and edges of the room, or boards that still feel loose underfoot are all signs the work wasn't done properly.
Will gaps between my floorboards disappear after sanding?
Not automatically, sanding alone doesn't close gaps. If you want a tighter, gap-free look, that needs proper gap filling carried out alongside the sanding work, not assumed as an automatic result.
Do I need to move out during a whole-property sanding project?
Not necessarily, but you'll need alternative arrangements for rooms being worked on directly, somewhere else to sleep if bedrooms are included, for instance. A good contractor sequences the work to minimise this disruption.
Call us on 020 7036 0625 or request a free site visit and we'll walk you through exactly what to expect for your specific property.
