Lime Plastering: A Complete Guide for UK Homes

Lime plaster is a traditional plaster made from lime, sand and water rather than modern gypsum or cement. It's used on older, solid-wall properties — especially pre-1919 buildings — because it's breathable: it lets moisture pass through the wall rather than trapping it. For the right kind of property, lime plastering is the correct, sympathetic choice; for a modern cavity-wall house, modern gypsum plaster is usually more practical.

What lime plaster is

Lime plaster is made from slaked lime (lime putty or hydraulic lime), mixed with sand and applied in coats. Unlike gypsum plaster, which sets by a chemical reaction and dries hard quickly, lime plaster hardens slowly by absorbing carbon dioxide from the air — a process called carbonation. That's why lime plaster takes weeks, not days, to fully cure.

There are two main types used in the UK:

• Lime putty plaster — very flexible, slow-setting, used for fine finishes and conservation work.
• Hydraulic lime plaster (NHL) — sets faster by reacting with water, used where a quicker, stronger set is needed.

Lime vs gypsum vs cement

| | Lime | Gypsum | Cement | |---|---|---|---| | Breathability | High | Low | Very low | | Flexibility | High | Low | Low | | Setting time | Weeks | Hours/days | Hours/days | | Best for | Solid-wall, period properties | Modern internal walls | External / hard-wearing | | Traps moisture? | No | Yes | Yes |

The key difference is breathability. Solid brick or stone walls need to breathe — moisture that enters the wall (from ground, rain or condensation) needs to be able to pass back out. Trapping that moisture behind a hard, non-breathable gypsum or cement layer is what drives damp problems in older properties.

When is lime plastering appropriate?

Lime plastering is the right choice for:

• Pre-1919 solid-wall buildings — brick, stone or rubble construction with no cavity
• Listed buildings and conservation areas — where original materials should be matched
• Properties with existing lime plaster — patching modern gypsum into a lime wall creates a moisture differential
• Walls showing signs of trapped moisture — staining, blown plaster or damp that worsens after modern plaster was applied

It's usually not the right choice for:

• Modern cavity-wall houses built after the 1920s
• Standard plasterboard partition walls
• Areas where a fast, hard set is needed for a tight programme

Benefits and drawbacks

Benefits:

• Breathable — manages moisture in solid walls
• Flexible — tolerates the slight movement older buildings are prone to, so it cracks less than rigid modern plaster
• Sympathetic — matches the original fabric of period buildings
• Long-lasting — a well-maintained lime plaster surface can last for generations

Drawbacks:

• Slow to cure — weeks rather than days, which affects project timing
• More expensive — the material costs more and the work is more skilled
• Harder to source — fewer plasterers are experienced with lime
• Needs the right conditions — it shouldn't dry too fast or freeze while curing

Does your London home need lime plaster?

A lot of London's housing stock — Victorian terraces, Edwardian semis, converted flats in older mansion blocks — has solid walls that were originally plastered in lime. Many have since been patched or over-plastered with modern gypsum, which is often when damp and blown-plaster problems start.

If you live in an older London property and you're seeing recurring damp, staining, or plaster that keeps blowing off the walls, the cause may be non-breathable plaster trapping moisture. The fix is to remove it and reinstate a breathable lime system — not to add more modern plaster on top.

We cover this in more detail on our lime plastering London service page, and the broader choice of finishes on our types of plaster page.

Cost considerations

Lime plastering costs more than standard gypsum plastering because:

• The material is more expensive
• Application is slower and requires more skill
• Curing time is longer, which can extend the overall programme
• Preparation and removal of old non-breathable plaster adds labour

It's an investment in the long-term health of an older building. Done properly, it solves moisture problems at their source rather than covering them up. For context on standard plastering costs, see our plastering prices page.

FAQ

Is lime plaster better than gypsum? Not "better" — different. Lime is correct for solid-wall period properties because it's breathable. Gypsum is more practical for modern internal walls.

How long does lime plaster take to dry? Lime plaster takes 4–8 weeks to fully carbonate. It's dry enough to decorate sooner, but full cure is slow.

Can you skim over lime plaster with gypsum? It's not recommended. A gypsum skim on a lime base creates a moisture trap and can cause the finish to fail. Use a lime finish coat.

Is lime plastering more expensive? Yes — typically more than standard plastering, because the materials cost more and the work is more specialised.

Does my Victorian house need lime plaster? If it has solid walls, probably yes for any re-plastering. Modern gypsum traps moisture in solid-wall construction.

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Not sure whether your period property needs lime plaster, a standard re-skim, or a repair? Send London Plastering Service some photos of the walls and the property type and we'll advise on the right approach, with a free quote.