Wooden Floor Refinishing Guide

Beyond aesthetics, refinishing provides a vital protective barrier against moisture and wear. In the UK's damp climate, ensuring your timber is properly sealed prevents warping and long-term structural damage to your floorboards.

What Does the Work Involve?

• Site Assessment: Identifying the wood species, checking for moisture levels, and ensuring boards are structurally sound.
• Preparation: Punching down protruding nails and replacing any irreparably damaged or "cupped" boards.
• Coarse Sanding: Using a heavy-duty belt sander to remove old finishes, deep scratches, and unevenness.
• Fine Sanding: Progressively moving to finer grits to create a perfectly smooth surface ready for treatment.
• Gap Filling: Mixing collected sawdust with a resin to fill cracks between boards for a seamless look and better draught proofing.
• Buffing: A final mechanical polish to remove "chatter" marks and open the grain for the finish.
• Sealing: Applying multiple coats of high-quality lacquer, hard-wax oil, or polyurethane varnish.

Typical Costs

Prices for floor refinishing are usually calculated per square metre (m²). Factors such as the condition of the wood, the type of finish chosen, and the number of rooms involved will influence the final quote.

Note: Most UK contractors include the cost of materials and VAT in their per-metre rate, but always confirm this during the quoting stage. High-end finishes like UV-cured oils will sit at the top end of the price bracket.

How Long Does It Take?

• Single Room (up to 15m²): 1.5 to 2 days, including drying time between coats.
• Full Ground Floor (30-50m²): 3 to 4 days, depending on the number of repairs needed.
• Curing Time: While floors are often "walkable" in socks after 24 hours, it can take 7 to 14 days for the finish to fully harden (cure) before furniture and rugs should be replaced.

DIY or Professional?

While you can hire drum sanders from local tool hire shops, refinishing is a high-skill task. Professional-grade machines are "dustless" (using integrated vacuum systems), whereas DIY equipment often creates a significant mess that can penetrate every room in the house.

Expert Tip: An inexperienced DIYer can easily "gouge" a floor by leaving a heavy sander in one spot for too long, causing permanent damage that is difficult to fix.

Choosing the Right Tradesperson

• Equipment: Ask if they use HEPA-filtered dust extraction systems to keep your home clean.
• Insurance: Ensure they have Public Liability Insurance (minimum £1 million).
• Samples: A good pro will offer to sand a small patch and apply a sample of the stain/oil so you can see the result on your specific wood.
• Questions to Ask:
  • How many coats of finish are included in the price?
  • What is the VOC (Volatile Organic Compound) level of the products you use?
  • Do you handle the removal and disposal of old carpets?

Common Problems

• Sanding Marks: Visible swirls or "chatter" marks caused by poorly maintained machinery or rushed work.
• Bleeding Back: When oil is applied too heavily and seeps back out of the gaps between boards, creating a sticky residue.
• Incompatible Finishes: Applying a water-based lacquer over an old oil-based stain without a proper primer, leading to peeling.
• Draughts: Failing to fill gaps in ground-floor boards can lead to significant heat loss and whistling noises in winter.

Frequently Asked Questions

Can engineered wood floors be refinished?

Yes, provided the "wear layer" (the top real wood surface) is at least 3mm thick. Most quality engineered floors can be sanded 1-3 times. Laminate flooring cannot be sanded.

How much dust should I expect?

Modern professional sanding is roughly 95-98% dust-free. However, a fine film of dust is inevitable. Most tradespeople will mask off doorways and sensitive areas with plastic sheeting.

Should I paint the skirting boards before or after?

It is generally best to do the "gloss work" or final painting of skirtings after the floor is finished. This avoids the sander scuffing your fresh paintwork, though the floor pro will still need to be careful.

How long will the new finish last?

In a typical UK home, a high-quality lacquer finish should last 7-10 years. Hard-wax oils may need a "top-up" coat every 2-3 years in high-traffic areas like hallways.

Is it better to use oil or lacquer?

Lacquer (varnish) sits on top of the wood and is very hard-wearing and waterproof. Oil penetrates the grain for a more natural look and is easier to spot-repair if scratched, but requires more frequent maintenance.