How to Price a Skim Coat: Per Room, Per M2 and What Affects the Price

Quick Answer: UK skim coat pricing in 2026 is £18–£30/m² for plasterboard skim, £25–£40/m² for skim over existing plaster (after PVA prep), and £30–£55/m² for skim over uneven or patched walls needing two coats. A typical 4×4m bedroom (12m² ceiling + 35m² walls = 47m²) costs £950–£1,600 plastered, taking 1–1.5 days for a single plasterer. Pricing must include preparation, multi-finish (or board finish), water, materials waste (typically 10%) and a clean-down, and exclude making-good rotted timbers, fixing electrical chases or filling bonding-coat depths over 10mm — those are separate trades or a separate price.

Summary

Skimming is one of the most consistently mis-priced trade jobs in the UK because the visible task — applying a 2–3mm finish coat — is a small part of the actual labour. The setup, sheet-up, sponging the joints, PVA two-coat to seal old surfaces, scrim taping, mixing, two-coat application, trowelling at the right cure window, sponge-down, edge clean-up — all of this consumes 60–70% of the time. A plasterer who quotes "£15/m²" without seeing the surface is gambling, and the lost margin shows up as rushed jobs and call-backs.

The price drivers are: surface type (new plasterboard, sound existing plaster, uneven walls, painted gloss surfaces, plywood), the room (kitchens and bathrooms have more cuts and edges per m² than bedrooms, ceilings are slower than walls), the access (height, single storey vs scaffold), and the prep required (chasing-out, scrim, bonding coat, PVA). The going rate can vary by 100% across these variables on the same nominal m² figure.

The other piece of skimming pricing missed by quotes is the per-day floor — most experienced plasterers won't get out of bed for less than £200–£280 day rate. A small job (e.g. a single 8m² ceiling) needs to be priced at a day rate, not at a per-m² rate, because the setup cost dominates. Two small jobs in different houses on the same day can be priced at half-day rates.

Key Facts

Quick Reference Table — Skim Pricing by Room

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Room Typical area (walls + ceiling) Plain skim (£) Boarded + skim (£)
Small bedroom (3×3m) 35–40m² £700–£1,200 £1,000–£1,600
Standard bedroom (4×4m) 45–50m² £950–£1,600 £1,300–£2,100
Large bedroom (5×4m) 55–65m² £1,150–£2,000 £1,650–£2,800
Living room (5×4m) 55–65m² £1,150–£2,000 £1,650–£2,800
Kitchen-diner (6×4m) 70–80m² £1,400–£2,500 £2,000–£3,400
Hallway (typical semi) 25–35m² £600–£1,300 £900–£1,700
Bathroom (2×3m) 25–30m² £550–£1,200 £800–£1,500
Single ceiling (4×4m) 16m² £350–£600 (day rate floor) £450–£800

Detailed Guidance

What's actually included in a skim quote

A correctly itemised skim quote should cover:

  1. Sheet-up — dust sheets, plastic protection, masking
  2. Surface prep — cleaning, two-coat PVA over existing plaster, scrim over board joints, beads to corners and stops
  3. Bonding coat (where needed) — to fill cavities, repaired chases, deep depressions
  4. Two-coat finish — first coat, ruled and trowelled; second coat, polished
  5. Polishing — final trowel pass at the right cure window for a flat, flawless finish
  6. Sponge-down — angles, beads, finishes cleaned with damp brush
  7. Clean-down — sheets removed, debris cleared, surfaces wiped down

A quote that says only "£20/m² skim" is incomplete. Make sure the customer understands what's included and what isn't (e.g. is making-good chases included? Is scrim included? Is PVA prep included?).

Per-m² vs day rate — which to use when

Use per-m² for:

Use day rate for:

A quote should never be "£20/m² minimum £250" — that's an insult to the customer's reading ability. State the rate clearly: per-room price, with all prep included.

Bonding coat — the price multiplier most plasterers forget

If the existing wall surface has depressions over 5mm — old chases, lath-and-plaster patches, paint stripping pulls — the surface needs a bonding coat (Carlite Bonding or Thistle Bonding) under the finish coat. This adds:

Always inspect before quoting. A wall with two old chase repairs and a patched-up section behind a removed unit might be 40% bonding-coat work and 60% skim — total cost £35–£50/m², not £20/m².

Plasterboard prep — scrim and beads matter

New plasterboard joints must be scrim-taped before skimming or they will crack within months. Internal corners get scrim; external corners and openings get bead. The cost:

Per typical bedroom: £40–£80 in beads and scrim. Don't skip these in the quote — they're functional, not optional.

Mist coat — paint after plaster

Fresh plaster should not be painted directly with full-strength emulsion or with primer/undercoat. The first coat must be a "mist coat" — emulsion diluted with water (manufacturer-specific, typically 30–50% water) and applied as a sealing/penetrating coat. Two further coats of full-strength emulsion follow.

Most plasterers don't quote for paint, but they should advise the customer on the mist-coat process. A plaster job that gets painted incorrectly looks bad and the plasterer often gets blamed.

Drying time — manage customer expectations

Multi-finish takes 2–4 weeks to fully dry to the point where it can be painted with full-strength emulsion. In winter (cold, damp, no heating), this stretches to 6 weeks. Mist coat at 1 week is a compromise that works most of the time but occasionally needs to be reapplied if the wall flashes (uneven absorption).

Tell customers at quote stage: "Plaster pink for 1–2 weeks, walk-out next day, mist coat at 1–2 weeks, full paint at 4 weeks." Set expectations early to avoid call-backs.

Old plaster vs lath-and-plaster

A pre-1900 lath-and-plaster wall is a different job from a post-1960 plasterboard or solid plaster wall. Options:

  1. Skim over — only if lath-and-plaster is sound and not delaminating; PVA two-coat then skim. Cost: £30–£50/m²
  2. Overboard with plasterboard then skim — if lath is loose; battens to lath, plasterboard to battens, scrim and skim. Cost: £50–£80/m²
  3. Strip and rebuild — if lath is rotten; full strip to studs, board, scrim, skim. Cost: £70–£110/m²

Always inspect a Victorian or older house before quoting flat-rate skim.

Frequently Asked Questions

How much is a skim coat for a single room?

Bedroom (4×4m walls + ceiling): £950–£1,600. Living room (5×4m): £1,150–£2,000. Add £15–£40/m² for ceilings if existing finish is artex (which legally cannot be sanded — must be overboarded or sealed-and-skimmed).

Can I skim over Artex?

Yes, but with care. Pre-2000 Artex contains chrysotile asbestos. Do NOT sand. Two safe options: (1) overboard with new plasterboard, scrim, skim; (2) PVA two-coat then bonding coat then finish coat — seals fibres in. Strip-and-replace is asbestos-removal work and should not be done unless using a licensed contractor.

How long after skimming before I can paint?

Mist coat at 7–14 days; full coat at 14–28 days. Faster in summer, slower in winter. Don't paint while plaster is still pink — wait for uniform light beige colour throughout.

Do plasterers quote per square metre or per room?

Both. Whole-room jobs are usually quoted per room (which the plasterer calculates from m²). Patch repairs are usually quoted as a flat fee or day rate.

What's the going day rate for a UK plasterer?

£200–£280/day single-handed; £350–£480/day with a mate. London and South East run 20–30% above. Out-of-hours or rush jobs at 50–100% premium.

Regulations & Standards