Lime plaster is the traditional plastering material used in UK buildings constructed before around 1920. It is made from slaked lime (calcium hydroxide), aggregate and sometimes hair for reinforcement. Understanding when and why to use it can save period property owners a lot of expense and frustration.
Why Lime Plaster Matters in Old Buildings
Old buildings move slightly with seasonal temperature and humidity changes. Lime plaster is flexible and “breathable” — it allows moisture to pass through the wall rather than trapping it. If you use modern gypsum plaster or cement render on an old building, you trap moisture inside the walls, which causes rising damp, spalling stonework and timber rot.
When to Use Lime Plaster
- In any building constructed before 1920 with solid masonry walls
- Listed buildings (often a condition of consent)
- Where breathability is essential — basements, ground floor walls in old properties
- Where lime was the original material and you want a historically appropriate repair
Lime Plastering Costs
| Work type | Typical cost per m² |
|---|---|
| Lime skim coat | £15–£25 |
| Lime plaster (2-coat) | £30–£50 |
| Lime plaster on lath | £45–£70 |
| Lime render (external) | £35–£60 |
How Long Does Lime Plaster Take to Dry?
Lime plaster dries much more slowly than gypsum — typically 4–8 weeks before decoration, and up to 12 months before it reaches full hardness. Do not rush the drying process; lime plaster that dries too fast (from heating or direct sunlight) will crack. Keep rooms ventilated but not hot.
Find a Lime Plastering Specialist
Lime plastering requires specialist knowledge. Get 3 free quotes from local tradespeople experienced with traditional plaster systems.