Having your timber floors professionally sanded and finished is one of the most rewarding home improvements you can make. Knowing what to expect on the day means fewer surprises, a smoother job, and a better result for everyone involved.
Before the Sander Even Starts
A good floor sanding professional will arrive and do a walk-through inspection before any machinery is switched on. They'll check the condition of your boards, look for protruding nails or staples, identify any damaged or cupped boards, and confirm the finish you've agreed on. This is your last chance to raise any concerns or point out areas that need special attention — don't be shy.
Expect them to ask you to have the room completely cleared of furniture, rugs, and any freestanding items. Most floor sanders won't move heavy furniture as part of their standard quote, so confirm this beforehand. Curtains and soft furnishings in adjacent rooms are worth removing or covering too, as fine dust travels.
Dust and Noise — What's Normal
Modern professional floor sanders use dustless or low-dust systems with powerful vacuum extraction attached directly to the sanding machine. These dramatically reduce airborne dust compared to older equipment, but they don't eliminate it entirely. Expect some fine dust to settle on surfaces in the room and nearby areas.
The sanding process is also loud — similar to a lawnmower running indoors. If you're working from home, plan to be elsewhere or in a well-separated part of the house. Ear protection is standard for the tradesperson; you may want some too if you're staying on site.
For health and safety reasons, WorkSafe NZ notes that fine timber dust can be a respiratory hazard, so a reputable operator will wear appropriate PPE and ensure good ventilation. Keep children and pets well away from the work area throughout the day.
The Sanding Process Step by Step
Here's a typical sequence for a standard hardwood or pine floor:
| Stage | What Happens |
|---|---|
| Nail check | All nails punched below the surface so they don't tear the sandpaper |
| Coarse sanding | Big drum or belt sander removes old finish, stains, and levels the surface |
| Edge sanding | Edging machine works the perimeter the drum can't reach |
| Detail sanding | Hand scraper or detail sander tackles corners and tight spots |
| Medium sanding | Second pass smooths out coarse scratches |
| Fine sanding | Final pass prepares a smooth, even surface for finishing |
| Vacuuming & tack | Thorough clean before any coating is applied |
The number of passes depends on the condition of your floor. A heavily worn or previously painted floor may need extra coarse passes; a lightly worn floor in good condition may need fewer.
Applying the Finish
Once sanding is complete and the floor is thoroughly cleaned, the finishing coats go on. Common options in NZ include:
- Waterborne polyurethane — fast drying, low odour, popular for homes with children or pets
- Oil-based polyurethane — harder wearing, longer dry times, stronger fumes
- Hardwax oil — a natural look, easier to spot-repair later
- Penetrating oil — soaks into the timber for a matte, natural finish
Most finishes require two to three coats, with a light sand (called a screen sand or buff) between coats. Your tradesperson will advise on dry times between coats — typically two to four hours for waterborne products, longer for oil-based. The floor will be walkable in socks within a few hours of the final coat, but full cure (when you can replace furniture) usually takes five to seven days.
For product information, brands like Wattyl, Dulux, and Resene all offer floor finishing systems your tradesperson may use.
Ventilation and Odour
Keep windows open where possible during and after finishing to help the coatings cure and to clear any fumes. Oil-based products in particular have a strong solvent smell that can linger for 24–48 hours. Waterborne finishes are much more pleasant to live around.
What You Need to Do on the Day
- Clear the room completely before the crew arrives
- Remove or cover nearby soft furnishings to protect from dust
- Plan to be out or in another part of the house during sanding
- Keep pets and children away from the work area all day
- Don't mop or wet the floor in the days leading up to sanding — moisture raises the grain
- Have a plan for the evening — you may not be able to walk through the room if a final coat goes on late in the day
When to Call a Professional
Floor sanding is skilled work. Hiring the wrong equipment and attempting it yourself can result in drum marks, uneven surfaces, or boards sanded through — damage that's expensive to fix. A qualified floor sanding professional has the right machinery, the experience to read the timber, and the knowledge to choose the correct finish for your specific floor type and household.
If your floor has significant structural damage, springy boards, or moisture issues, a professional can identify these before sanding begins. Addressing subfloor problems first will save you money in the long run. You can find qualified local floor sanding professionals on tradedirectory.co.nz.
For general guidance on timber floors and building standards in NZ, BRANZ and MBIE Building Performance are reliable starting points.
