Plastering & Skimming

Skim over or re-board: which does your wall need?

Skim over the existing surface when the old plaster is solid, dry and well adhered — tap it and it sounds dense, not hollow. Re-board (or hack off and float) when plaster is blown, crumbling, riddled with old fixings, or the wall underneath is out of true by more than a skim can hide.

The tap test is the honest ten-second survey: hollow, drummy patches mean the plaster has separated from the wall behind it, and skimming over a blown background just gives the failure a nicer surface to fall off with. Small blown patches can be cut out and filled with Bonding Coat before the skim; once more than about a third of a wall is loose, hacking off and starting again is cheaper than chasing patches. In the Victorian terraces of Surbiton — walls we know street by street — the original lime plaster is often soft but sound, and a bonding agent plus skim preserves it; where damp has got into it, that is a different job entirely.

Re-boarding — fixing fresh plasterboard over the old wall, then skimming — is the right call for badly cratered surfaces, and it is often faster and cleaner than a full hack-off. We will tell you which your walls need at the quote, wall by wall, because the answer is rarely the same for all four.

What does plastering a room cost in Surrey in 2026?

Skimming the walls of a typical room costs £250–£450 in Surrey in 2026, and a ceiling skim £200–£350, depending on size and the state of the existing surface. A full hack-off and two-coat re-plaster of a room runs £400–£700. Small patch repairs start from around £120.

Where a quote lands inside those ranges comes down to preparation, not plastering: a sound modern wall needs a coat of bonding agent and a day; a wall carrying sixty years of paint, filler and old wallpaper paste needs stripping, stabilising and sometimes partial hack-off before a trowel ever touches it. Ceiling work also prices on access and what is up there — a flat plasterboard ceiling is quick, while boarding over a tired surface and skimming runs £350–£600.

Every quote is written, itemised by room, and fixed. If we open up a wall and find something genuinely unforeseeable — hidden damp, failed backing plaster to the brick — we stop and talk to you before any extra cost exists. No day-rate drift, no "while we were in there" invoicing.

How long before I can paint fresh plaster?

A fresh skim dries in roughly 2 to 5 days depending on ventilation, season and how thick the coat is — it turns from dark brown to a pale, even pink when ready. Then paint with a mist coat first: emulsion watered down by 50–70%, so the plaster can absorb it.

The mist coat is the step people skip and regret. Fresh plaster is porous, and full-strength vinyl emulsion applied straight onto it sits on the surface as a skin that peels off in sheets — sometimes months later, taking your topcoats with it. One cheap watered-down coat solves it permanently. After that, paint as normal.

What you must not do is force it. Blasting a freshly skimmed room with heaters or a dehumidifier running flat out makes the plaster dry too fast, and fast drying is what causes shrinkage cracking and a weak, powdery surface. Open a window, keep the room ventilated, and let it take the days it takes. Winter skims in an unventilated room can need a week; that is normal, not a defect.

Why do new skims crack — and when does it matter?

Hairline cracks in a new skim are almost always shrinkage from drying too quickly, and they are cosmetic — filled and painted over, they never return. Cracks that are wider than a hairline, follow a straight line, or keep reopening after filling point to movement in the background, which no skim can fix.

Shrinkage crazing — a fine map-like pattern — happens when suction was not controlled or the room was force-dried, and it is the signature of rushed work. Done properly, with the background sealed and the plaster polished at the right moment, a skim should dry out flat and crack-free; the odd hairline at a board joint or around a window reveal is within the nature of the material and takes thirty seconds of decorator's caulk.

The cracks to take seriously are the repeat offenders: a stepped crack tracking the mortar lines, a ceiling crack that mirrors a joist, a corner crack that reopens every winter. Those are the building moving, not the plaster failing — and where damp or structural movement is the real cause, we say so plainly and point you at the right fix, such as re-plastering after damp treatment, rather than selling you a skim that papers over it.

Can you skim over wallpaper, paint or old Artex?

Paint, yes — if it is sound, keyed and sealed with a bonding agent. Wallpaper, no — it must come off, because plaster over paper fails as soon as the paste rehydrates. Old Artex, often — but pre-2000 Artex may contain asbestos, so it gets tested before anyone touches it.

Painted walls are the everyday case. Sound emulsion gets a PVA or acrylic bonding agent to give the skim both grip and controlled suction; flaking or glossy paint gets scraped, sanded or stabilised first. Wallpaper is the false economy: it feels solid today, but the moisture in fresh plaster softens the paste underneath and the whole lot can part company from the wall. Stripping it is dull work and we price it honestly.

Artex deserves its own caution. Textured coatings applied before around 2000 can contain white asbestos, and the risk is in disturbing it — sanding, scraping or hacking. Our rule is fixed: suspect material gets sampled and tested by a UKAS-accredited lab before any work, and we never disturb untested texture. Where it tests clear, skimming over a stabilised Artex ceiling is routine — see our Artex removal and covering service for the full options. And if what you actually want is a feature finish rather than flat white, a polished Venetian plaster is a different conversation we are happy to have.