Sanding and refinishing a timber floor can transform a dull, scratched surface back to like-new condition — and it's far cheaper than replacement. Here's what floor sanding costs in NZ in 2026, what's involved, and how to choose the right finish.
Floor Sanding Cost NZ 2026
| Service | Typical cost |
|---|---|
| Sand and finish — hardwood (per m²) | $40–$80/m² |
| Sand and finish — pine (per m²) | $35–$70/m² |
| Sand only (per m²) | $20–$40/m² |
| Finishing only — coat existing floor (per m²) | $15–$30/m² |
| Floor staining (per m², colour application) | $10–$20/m² extra |
| Gap filling (per m²) | $10–$25/m² |
| Feature strip sanding (borders, herringbone) | 20–40% premium |
Typical complete project costs:
| Room / area | Sand + finish cost |
|---|---|
| Single bedroom (12m²) | $500–$980 |
| Lounge (25m²) | $1,000–$2,000 |
| Full 3-bedroom home (80m²) | $3,200–$6,400 |
| Full 4-bedroom home (110m²) | $4,400–$8,800 |
All prices include 3 sanding passes and 2–3 coats of finish. GST inclusive. Auckland 15–20% above. Prices for reasonably sound floors — severely damaged, cupped, or previously painted floors add cost.
The Floor Sanding Process
1. Preparation
- Furniture removed from rooms
- Any protruding nails punched below the surface (nails above the surface destroy sanding belts)
- Floor inspected for damaged boards, cupping, gaps
2. Sanding Passes
A drum sander (large machine for main floor area) and edge sander (for perimeter and corners) are used in sequence:
- Coarse pass (40–60 grit): Removes old finish, levels the floor, removes surface damage
- Medium pass (80–100 grit): Removes coarse scratches, refines the surface
- Fine pass (120–150 grit): Final smooth surface ready for finishing
Corners and edges that the drum sander can't reach are finished by hand or with an orbital detail sander.
Dust: Sanding produces large amounts of fine dust. Professional sanders use dust-extraction machines, but some fine dust is unavoidable. Cover internal door gaps and remove sensitive items. Expect to do a thorough clean after sanding.
3. Gap Filling (Optional)
Old timber floors have gaps between boards from decades of movement and shrinkage. Gaps can be filled with: - Floor filler / putty (sanding dust + adhesive): Good for small gaps, matches floor colour naturally - Cork: More flexible than putty, absorbs movement — better for larger gaps - Timber strips: Used for very wide gaps — labour-intensive but the best aesthetic result
Important: Timber floors continue to move with humidity. Rigid filler in large gaps will crack. For wide gaps (over 3mm), cork or flexible filler is better than rigid products.
4. Staining (Optional)
A stain is applied after fine sanding and before the protective topcoat. Changes the colour of the floor — from natural to dark ebony, grey, or any colour in between.
Popular NZ floor stain colours: Natural/clear (shows wood colour), warm brown, dark walnut, cool grey, ebony (very dark). Grey-stained floors have become very popular in NZ over the last 5 years.
Note: Staining is difficult to reverse — once stained dark, a floor cannot easily be returned to natural without very aggressive sanding. Be certain of the colour before applying.
5. Finishing Coats
The protective topcoat seals and protects the floor. Options:
Polyurethane (water-based or oil-based): - Most common NZ floor finish - Water-based: Low odour, faster drying (recoat in 2–4 hours), slightly cooler tone - Oil-based: Stronger odour, longer drying (8–12 hours between coats), warmer amber tone, slightly more durable historically
Hardwax Oil (Rubio Monocoat, Osmo): - Penetrating finish that enhances the natural look and feel of timber - No film on the surface — the wood feels like wood, not plastic - Easier to spot-repair than polyurethane (can recoat sections without full sand) - Growing in popularity in NZ for premium floors - Slightly lower durability in very high traffic areas vs thick polyurethane film
Lacquer: - Fast drying, hard finish - Popular in commercial settings, increasingly in residential
Typical coats: 2–3 coats of polyurethane (each coat adds protection). Lightly sand between coats for adhesion (220 grit screen or buff).
How Many Times Can a Floor Be Sanded?
This depends entirely on how much timber is above the tongue-and-groove joint:
- Solid hardwood (19mm or 25mm): Can be sanded 4–7 times over its lifetime
- Solid pine (25mm): Can be sanded multiple times, but pine is softer and wears faster
- Engineered timber (3–6mm wear layer): Can be sanded 1–3 times depending on wear layer thickness — check manufacturer spec
- LVT / vinyl plank: Cannot be sanded — not real wood
Check before sanding: If the existing finish is very thick or the floor has been sanded many times, check the floor thickness before proceeding. A floor sander can advise.
DIY Floor Sanding
Drum sander and edge sander hire: $150–$250/day from Kennards Hire or Hirepool.
DIY is feasible but challenging: - Drum sanders are aggressive — pausing while the drum spins creates deep gouges - Sanding lines are visible in the final result if technique is inconsistent - Corner work and edges require skill to blend with the main floor
Recommendation: DIY is viable for a laundry or spare bedroom where perfection isn't critical. For lounge or main living areas, professional sanding gives a much better result.
Find floor sanders near you: Floor Sanders NZ | Post Your Floor Job Free
Frequently Asked Questions
How much does floor sanding cost in NZ? Sand and finish (hardwood): $40–$80/m². A full 3-bedroom home (80m²): $3,200–$6,400. A single lounge (25m²): $1,000–$2,000. Gap filling and staining are typically extra.
How long does floor sanding take in NZ? A 3-bedroom home: 2–3 days of sanding and finishing. Each coat of polyurethane needs 2–4 hours drying time (water-based) before the next coat. You can usually walk on the floor lightly after 24 hours and return furniture after 48–72 hours, but full cure takes 7–14 days.
How often should timber floors be sanded and refinished? A polyurethane-finished floor: sand and recoat every 10–20 years, or when scratching and wear become noticeable. A hardwax oil floor: spot-maintain as needed, full sand less frequently. Regular maintenance (sweep, damp mop, felt pads on furniture) significantly extends the interval between full sands.
Can engineered timber floors be sanded in NZ? Yes, if the wear layer is thick enough (3mm minimum remaining). Many NZ engineered floors have 3–6mm wear layers and can be sanded once or twice. Check with the manufacturer or a floor sander who can measure the remaining timber above the groove.
What is the best floor finish for a NZ home? Water-based polyurethane is the most popular choice — low odour, fast drying, good durability, cool neutral tone. Hardwax oil (Rubio Monocoat, Osmo) is growing in popularity for those who prefer the natural wood look and feel. Oil-based polyurethane gives a warmer amber tone and is still preferred by some, particularly for rimu or kauri floors where the warmth suits the timber.
Related: Timber Flooring Cost NZ | Vinyl Flooring Cost NZ | Post a Job Free