Plastering costs explained: skim vs full re-plaster
Plastering quotes can look confusingly different from one job to the next, and a large part of the reason is that "plastering" actually covers two genuinely different jobs — a quick skim over an existing sound surface, and a full re-plaster starting from bare brick or block — priced very differently because the amount of work involved is very different.
A skim coat, sometimes just called "skimming," is a thin finish layer, typically only a few millimetres thick, applied over an existing surface that's already structurally sound and reasonably flat. This is the cheaper and quicker of the two options, commonly costing around £15-£25 per square metre for wall work, since there's no need to strip anything back or apply a thicker backing coat first — the existing surface is doing the structural work, and the skim is purely there to give a smooth, paintable finish. A full re-plaster is a considerably bigger job: it involves stripping the old, damaged plaster off entirely, back to bare brick or block, then applying both a thicker base or backing coat to build the surface back up, followed by a skim finish coat on top. Because it's genuinely two coats of work plus the labour of stripping the old surface first, a full re-plaster commonly costs around £25-£40 per square metre — noticeably more than skimming, and for good reason given the extra material and time involved.
Ceilings follow the same basic pattern but at a slightly higher price point than walls for both types of work, commonly around £18-£30 per square metre for a skim and £30-£45 per square metre for a full re-plaster. Ceiling work is generally slower and more physically demanding for a plasterer — working overhead rather than on a vertical wall — which is reflected in the higher rate.
The deciding factor between the two isn't really about preference or budget on its own — it comes down to the actual condition of the existing surface. Skimming only works properly if what's underneath is structurally sound: no significant cracking, no damp damage, no areas where the existing plaster is loose, hollow-sounding when tapped, or already flaking away. A skilled plasterer can usually tell fairly quickly by inspecting and tapping the surface whether it's a genuine skim candidate. Where the existing plaster is damaged, cracked extensively, affected by damp, or has already been removed — common in older properties being renovated, or where a previous damp problem has been resolved and the affected plaster needs replacing — a full re-plaster is generally the only proper long-term fix; skimming over a compromised surface underneath tends to mask a problem rather than solve it, and cracks or damp issues typically reappear through the new skim coat within a relatively short time.
For anyone getting quotes, it's worth asking the plasterer directly which approach they recommend and why, rather than simply requesting "a quote for plastering" without specifying which job is actually needed — a vague enquiry can lead to quotes for genuinely different scopes of work that aren't comparable to each other. If a plasterer inspecting the property in person recommends a full re-plaster where the homeowner was expecting (and budgeting for) a cheaper skim, it's reasonable to ask them to explain specifically what they've found that rules out skimming, since a professional should be able to point to visible cracking, hollow sections, or damp evidence rather than simply recommending the more expensive option by default.
It's also worth factoring in that a full re-plaster generally needs longer before the room is fully usable again — not just for the plastering work itself, but for the subsequent drying time before painting can begin, which tends to be longer for a thicker backing coat than for a thin skim over an already-sound surface. Planning the wider decorating schedule, including painting, around this reality avoids the common frustration of a room being "finished" from a plastering perspective but still not ready to actually paint and use.
Frequently asked questions
A skim coat over an existing, structurally sound wall commonly costs around £15-£25 per square metre, since it is a thin finish coat that doesn’t require stripping back to bare brick or a thicker backing coat.
A full re-plaster — stripping old plaster back to bare brick and applying both a backing coat and a skim finish — commonly costs around £25-£40 per square metre for walls, and around £30-£45 per square metre for ceilings.
It depends on the condition of the existing surface — skimming only works if what’s underneath is sound, flat and free of significant cracking, damp damage or hollow, loose areas; if the existing plaster is compromised, a full re-plaster is generally needed for a lasting result.
A full re-plaster involves stripping the old plaster off entirely and applying two coats — a backing coat and a skim finish — rather than one thin skim coat over an already-sound surface, which is why it typically costs noticeably more per square metre.