How to Price Floor Sanding: Labour, Materials and Margin Guide

Quick Answer: UK floor sanding typically prices at £20-£45 per m² supply-and-fit (sand, gap-fill and finish), with a standard room (15-20m²) costing £400-£900 and a whole house £1,500-£4,000+. The price swings on the grit sequence, gap-filling, the finish chosen (hardwearing oil-modified or polyurethane lacquer versus penetrating hardwax oil), and edging/detail work. There is no specific British Standard for the act of sanding, but dust must be controlled under the Control of Substances Hazardous to Health (COSHH) Regulations 2002, and wood-floor installation/finishing should follow BS 8201:2011 (code of practice for installing flooring of wood and wood-based panels).

Summary

Floor sanding looks like a simple machine job and is anything but. The drum or belt sander does the field in a few passes, but the money and the risk are in the edges, the corners, the gap-filling, the dust control, and above all the finish — get the grit sequence or the finish wrong and you have a streaked, swirl-marked floor the customer will not pay for. It is a finishing trade, priced per m² but won or lost on detail.

The biggest pricing mistakes are: quoting per m² without checking the floor can actually be sanded (engineered boards have a thin wear layer that may only take one or two sands), forgetting that edging and corners are slow hand-and-machine work that the big sander cannot reach, under-pricing gap-filling (a Victorian pine floor with 3-5mm gaps is a job in itself), and not charging properly for the finish coats and the drying days between them. The other classic miss is the dust — proper dust extraction is a selling point and a COSHH duty, not an optional extra.

This guide covers standard solid-wood sanding, engineered timber, gap-filling, finish selection (oil versus lacquer), and parquet/specialist floors. It assumes UK domestic work — pine, oak, parquet — and prices in the realities of edging, multiple grit passes, and the drying time that ties up the room.

Key Facts

• Sanding abrasive grit sequence — coarse 24/36/40 (strip), medium 60/80 (level), fine 100/120 (finish)
• Drum / belt sander (hire) — £40-£70 per day; belt sanders give a flatter, swirl-free finish
• Edging sander (rotary edger, hire) — £25-£45 per day
• Detail / corner sander or scraper — hand tools; consumable
• Sanding belts/discs (abrasive consumables) — £2-£6 each; a room burns through several grits
• Wood filler / resin + dust gap-filling compound — £15-£40 per room
• Reclaimed slivers/strips for large gaps — priced per metre of gap
• Hardwax oil (penetrating, e.g. 2 coats) — £45-£90 per 2.5L (covers ~25-30m²/coat)
• Polyurethane / oil-modified lacquer (3 coats) — £40-£80 per 5L (covers ~35-45m²/coat)
• Wood stain / colour (optional) — £25-£60 per tin
• Floor sander day rate — £180-£280 regional, £250-£380 London
• Supply-and-fit rate — £20-£45 per m² depending on finish and gap-filling
• Drying time — lacquer 2-6 hrs between coats, oil 8-24 hrs; full cure days to weeks
• Solid wood sanding life — many times over decades (board thickness allowing)
• Engineered wood wear layer — typically 2-6mm; only takes 1-3 light sands
• Dust control — COSHH 2002; wood dust is a respiratory hazard, extraction required
• VAT — 20% standard; 5% may apply on qualifying renovations (VAT Notice 708)

Quick Reference Table

Detailed Guidance

Standard Solid-Wood Sanding — The Grit Sequence Is the Job

A typical solid pine or oak floor is sanded in a sequence of progressively finer grits, each pass removing the scratches of the last:

Skipping a grit is the single most common cause of a poor floor — coarse scratches show straight through the finish under raking light. Each pass is the full field with the drum/belt sander, then the same grit around the perimeter with the edger, then corners by hand. The edging and corners are slow and are why "the machine bit only took two hours" is a trap: the edges and detail can take as long as the field.

Pricing example (regional, standard 18m² room, sand + lacquer):

Engineered Timber — Check the Wear Layer First

Engineered boards have a real-wood top veneer over a plywood/HDF core. The wear layer is typically only 2-6mm, and once you sand through it the board is ruined. Before quoting, establish the wear-layer thickness:

• <2mm wear layer — often only a light buff-and-recoat is safe, not a full sand
• 2-4mm — one or two careful light sands over its life
• 4-6mm — can be treated more like solid wood, but still finite

Always inspect, and if uncertain say so in writing. A floor sander who sands through an engineered veneer owns the replacement cost. Price engineered work conservatively and lead with a light sand / re-coat where the wear layer is thin.

Gap-Filling — Price It Separately

Older floors (especially Victorian/Edwardian pine) shrink and leave gaps between boards that draught, collect dirt, and look unfinished. Filling them is a distinct operation, not part of the sanding rate:

• Resin + sawdust slurry — the floor's own sanding dust mixed with resin, worked into small/medium gaps; tints to match. Good for gaps up to ~3-4mm.
• Reclaimed timber slivers/strips — for large gaps (>4-5mm), thin strips of matching timber glued and wedged into the gaps, then sanded flush. Slow, skilled, charged per metre of gap.
• Flexible filler — for floors that still move; less rigid, accommodates seasonal movement.

A pine floor with consistent gaps can add a day or more. Quote gap-filling as its own line so the customer sees the value and you protect the margin.

Pricing example (regional, Victorian pine 16m² room with heavy gap-filling):

Finish Selection — Oil vs Lacquer Changes the Price and the Promise

The finish is the customer-facing decision and a real cost variable:

• Polyurethane / oil-modified lacquer — a surface film; hardwearing, water-resistant, 3 coats, faster drying (recoat in hours). When it eventually wears it scratches visibly and needs a full re-sand to refinish. Good for high-traffic, kitchens, rentals.
• Penetrating hardwax oil — soaks into the timber, natural matt look, easy to spot-repair (re-oil a worn area without sanding the whole floor), but less abrasion- and water-resistant. 2 coats, slower drying. Popular for a natural finish and living areas.

The finish also drives the schedule: drying time between coats ties up the room. Lacquer recoats in 2-6 hours (a floor can be 3-coated in a day with care); oil needs 8-24 hours between coats, often spanning two or three days. The customer cannot use the room during this — price the days and set the expectation.

Parquet, Herringbone and Specialist Floors

Block and herringbone floors are slower and dearer:

• Multi-direction grain — the drum sander cannot run with the grain across a herringbone pattern; finer grits and careful diagonal passes are needed to avoid scratching across the grain
• Loose/lifting blocks — old parquet often has loose blocks needing re-bedding before sanding
• Bitumen-bedded blocks — old parquet may be laid on bitumen, which clogs abrasives and complicates re-fixing
• Thin blocks — limited sanding life; check thickness

Parquet is a per-room premium of 20-40% over a plain board floor for the slower, careful work.

Dust Control — A COSHH Duty and a Selling Point

Modern floor sanding uses dust-extraction-equipped machines or a connected vacuum to capture wood dust at source. Wood dust is a respiratory sensitiser and a fire risk, and controlling it is a duty under COSHH 2002. It is also a powerful selling point — "virtually dust-free sanding" wins jobs against cowboys who fill the house with dust. Price dust-extraction plant into the job and use it as a differentiator, not a hidden cost.

Common Pricing Mistakes

• Quoting per m² without checking the floor can be sanded — thin engineered wear layers, bitumen-bedded parquet, or worn-through boards change everything
• Forgetting edging and corners — the machine does the field fast; the perimeter and detail take as long again
• Gap-filling absorbed into the sanding rate — it is a separate, skilled operation; line-item it
• Under-pricing the finish coats — 2-3 coats plus the drying days that tie up the room are real cost and time
• Skipping a grit to save time — coarse scratches telegraph through the finish; the floor gets rejected
• No dust-control allowance — a COSHH duty and a competitive edge; never leave it off the quote
• Promising a fast finish on oil — oil needs long drying between coats; mis-sell the timeline and you lose the customer's confidence

Frequently Asked Questions

How much does it cost to sand and finish a floor per m²?

Typically £20-£45 per m² supply-and-fit, covering the full grit sequence, edging, and finish coats. The lower end is a plain board floor with a lacquer finish and minimal gap-filling; the upper end is hardwax oil, heavy gap-filling, or parquet. A standard 15-20m² room is usually £400-£900, and a whole house £1,500-£4,000+. Always quote gap-filling and any colour/stain as separate lines.

Can engineered wood floors be sanded?

Sometimes, and only carefully. Engineered boards have a thin real-wood wear layer (typically 2-6mm) over a core; once you sand through it the board is finished. A wear layer under about 2mm may only take a light buff-and-recoat, not a full sand. Always check the wear-layer thickness before quoting, lead with a light refinish where it is thin, and state the limitation in writing — sanding through a veneer makes the replacement your liability.

How many times can a solid wood floor be sanded?

A solid wood floor can be sanded many times over its life — typically several times across decades — limited by the board thickness down to the tongue-and-groove. Each full sand removes a small amount of timber. A floor sanded too often, or with very coarse grit, eventually reaches the tongues and can no longer be sanded. Light buffing and re-coating extends the life between full sands.

Should I choose oil or lacquer?

Lacquer (polyurethane/oil-modified) is a hardwearing surface film, faster to apply, more water-resistant, ideal for high-traffic areas and kitchens, but needs a full re-sand to refinish when worn. Hardwax oil soaks into the wood for a natural matt look and is easy to spot-repair without re-sanding, but is less water- and scratch-resistant. Match the finish to the room's use and explain the trade-off — including that oil takes longer to dry between coats.

How long before the floor can be used?

It depends on the finish. With lacquer, light foot traffic is often possible the same day or next day, with full cure over a week or two. With hardwax oil, allow longer between coats (8-24 hours each) and several days before heavy use, with full cure taking up to two weeks. Furniture and rugs should go back last. Always give the customer a written drying/curing schedule so they plan around it.

Regulations & Standards

• Control of Substances Hazardous to Health (COSHH) Regulations 2002 — wood dust control; dust extraction and RPE where required

• BS 8201:2011 — Code of practice for installing flooring of wood and wood-based panels

• BS EN 13556 — Nomenclature of timbers (species identification for matching)

• HSE WIS guidance on wood dust — exposure limits and control for wood dust

• Dangerous Substances and Explosive Atmospheres Regulations (DSEAR) 2002 — fine wood dust as a fire/explosion risk

• VAT Notice 708 — reduced rate for qualifying dwelling renovations

• HSE — Wood dust: controlling the risks — wood dust exposure and control

• HSE — COSHH — hazardous substances duties

• BSI — British Standards Institution — BS 8201, BS EN 13556

• The British Woodworking Federation — timber and wood-floor trade guidance

• VAT Notice 708: buildings and construction — reduced-rate eligibility

• flooring types — solid, engineered, laminate and parquet floor types compared

• engineered timber — engineered board construction and wear-layer limits

• pricing labour — day rates, margin and pricing finishing trades

• carpet fitting pricing guide — alternative floor covering pricing for comparison