Skimming and replastering can leave a smooth surface, but they start with different backgrounds and different amounts of preparation. The question is whether the existing material is sound enough to keep.
When a skim may be enough
If the existing plaster is firmly attached and the problem is mainly its surface finish, a skim can be considered. Typical reasons to ask include minor surface unevenness, a room after wallpaper removal or a sound plasterboard background. Coatings, contamination, suction and previous repairs still need checking before the system is chosen.
A thin finishing coat does not straighten a badly uneven wall or secure material that is separating from the background. Read more about skimming walls and ceilings.
When a local repair is the better starting point
A hole left by pipework or an isolated damaged corner may only need local preparation and making good. The surrounding plaster must be sound, and the finished patch may need wider decoration to blend visually. See the plaster repairs service for what to show in a photograph.
When to discuss replastering or boarding
Widespread hollow or crumbling areas, substantial depth differences, repeated failed patches or removal back to masonry can call for more than a finishing skim. A proposal might include removing unsound material, a suitable backing coat or new board, then a finish. The precise build-up depends on the wall and compatible materials.
Recurring cracks and damp require attention to their cause. Simply hiding them behind a new surface may lead to another failure. Ask for a written description of what is removed and rebuilt.
Compare the work, not only the finish
The London cost guide gives broad budgeting context; your written quote should describe the actual background and area.
What to send for an assessment
Photograph the whole wall in daylight, then cracks, hollow or damaged patches and previous repairs. Tell us the postcode, approximate dimensions and whether the room has had leaks or recurring movement. Do not remove suspect coatings just to show the background; ask how they should be assessed first.
Common choices
Does hollow-sounding plaster always mean the whole wall must be removed?
Not automatically. The extent and cause of the loose area matter. A local repair may be possible, while widespread failure changes the scope. An on-site assessment can determine the boundaries.
Will new plaster stop recurring cracks?
A fresh surface alone cannot resolve movement or an unstable background. Discuss the pattern and history of the crack before choosing a repair or wider replastering plan.
Discuss your own walls and ceilings
Send a wide photograph, close-ups of damage, the rooms involved and your postcode. We can discuss the surfaces, preparation and a free, no-obligation quotation.
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