The preparation stage
What decides the cost of putty and plaster repair.
This is usually the largest single line in a painting quotation, and the one most often folded into a rate where you can't see it. It deserves its own explanation.
Reviewed 6 September 2026.
At a glance
Why does putty and plaster repair cost so much relative to the paint?
Because it's almost entirely labour, and it decides whether the finish lasts. Filling, levelling and sanding a wall true takes far more time than rolling on two coats of emulsion, and repairing plaster that has actually failed, rather than just skimming putty over it, takes longer still. Depth of repair, not area, is what moves this number.
Measured by depth of repair, not just area
The wall area is the starting point, but what actually drives the cost is how much of it needs full putty and levelling versus a light skim or spot filling, and how much plaster underneath has separated from the masonry and needs cutting out and rebuilding rather than just filled.
In order of impact
What moves the number.
Listed largest first. If a quotation is silent on the ones near the top, that silence is itself the answer.
Depth of preparation needed
Spot filling, full putty and levelling, or plaster rebuild are three very different amounts of work on the same wall area.
How much plaster has actually failed
Hollow, blown plaster has to be cut out and rebuilt; this only shows once the loose material comes off, which is why quotes can adjust once work starts.
Crack density and type
Fine shrinkage cracks are quick to fill; a wall with several structural or reappearing cracks needs each one opened, treated and cured individually.
How true the existing surface is
New plaster and badly finished old plaster both need more putty thickness to read flat under raking light.
Sanding and finish standard
A surface behind a deep or high-sheen colour needs finer sanding than one behind a flat, pale finish.
Access and site conditions
Dust containment in an occupied home, and working around furniture, both add time to what is already the dustiest stage of the job.
Method
How we build the quotation.
There are no figures here because none has been approved for publication. What follows is the sequence, so you can check anyone's quotation against it.
- Surface checked by tapping, scraping test patches and looking under raking light.
- Loose and hollow material identified and cut back to sound plaster.
- Cracks opened, filled and given time to cure rather than skimmed over.
- Putty applied and sanded to the standard the specified finish needs.
- Primer chosen for the substrate once preparation is complete.
- Exclusions listed: structural repair, damp source treatment, plaster on surfaces we haven't assessed.
Wall Putty and Plaster Repair Cost — your questions.
Do all walls need full putty?
No. A sound, previously painted wall in good condition may need only cleaning and spot filling. Full putty is for new plaster, walls being levelled, or where the existing finish has to come off. We tell you which after looking at the wall, not by default.
Can the price change once you start filling and sanding?
Sometimes, and we say so upfront. Hollow plaster in particular isn't always visible until loose material comes off. If the scope needs to change, we stop, show you what we've found, and agree the revised cost in writing before continuing.
Why does plaster repair cost more than putty?
Because putty is a thin levelling layer over sound plaster, while plaster repair means cutting out material that has actually separated from the masonry and rebuilding it in fresh mortar, then curing it before anything else goes on. It's a different, slower job.
A measured quotation costs nothing.
We measure the property, assess the surfaces and issue an itemised quotation you can hold us to. There is no charge and no obligation.
- We call you back the same day to get a picture of the property and the surfaces.
- We agree a time and come out for the free inspection.
- You get the written scope and itemised quotation.
- Nothing starts until you approve it.