Lime Plastering Specialists for Listed & Period Properties. Traditional Methods. Lasting Results.
Breathable lime plasters applied by experienced craftsmen who understand heritage buildings. We use traditional methods and authentic materials — because your period property deserves better than modern gypsum.
Heritage-grade materials · 25+ years experience · Suitable for listed buildings
What Is Lime Plastering and Why Does It Matter?
Lime plastering is the application of plaster made from lime putty or hydraulic lime, mixed with sand and sometimes animal hair for reinforcement. Unlike modern gypsum plaster, lime plaster is breathable — it allows moisture to pass through the wall and evaporate naturally, preventing the damp problems that plague older buildings finished with impermeable modern materials.
Lime plaster is essential for listed buildings, conservation area properties, and any pre-Victorian structure originally built with lime mortar. Using modern gypsum plaster on these buildings traps moisture inside the walls, leading to damp, salt crystallisation, and structural decay of the masonry. Building conservation officers routinely specify lime plaster for listed building consent applications.
We specialise in lime plastering for period properties across London and the Home Counties. Our team understands the different types of lime (non-hydraulic lime putty, natural hydraulic limes NHL 2, 3.5, and 5), their appropriate applications, and the traditional techniques required to apply them correctly. Lime plastering is slower than modern methods and requires a different skill set — not every plasterer can do it.
Whether you're restoring a Georgian townhouse, repairing a medieval church, or renovating a Victorian cottage, we deliver lime plaster finishes that are historically authentic, structurally appropriate, and built to last for generations.
What Happens When Modern Materials Are Used on Historic Buildings
The most common mistake on period properties is applying modern gypsum plaster to walls originally finished with lime. Gypsum plaster is harder, more rigid, and impermeable compared to lime. When applied to old masonry, it traps moisture inside the wall. This moisture has nowhere to go — it can't evaporate through the impermeable gypsum surface, so it migrates sideways, upwards, and inwards, causing damp patches, salt efflorescence, and ultimately structural damage to the masonry.
Cement-based renders on the exterior cause the same problem. Hard cement render prevents the wall from breathing, concentrating moisture at the interface between the render and the masonry. In winter, freeze-thaw cycles turn this trapped moisture into a destructive force that spalls brickwork and erodes mortar joints. We've seen centuries-old brickwork destroyed in just a few years by inappropriate cement rendering.
Many contractors claim to offer 'lime plastering' but actually use gauged lime — a mix of lime and cement or gypsum that behaves nothing like true lime plaster. These hybrid products don't provide the breathability that historic buildings require. If your plasterer is using bags of premixed 'lime plaster' that sets in hours rather than days, they're not using authentic lime.
Repairing the damage caused by inappropriate materials is always more expensive than using the right materials from the start. We've spent weeks removing cement render from listed buildings, repairing the damaged brickwork beneath, and re-rendering with proper lime — a project that would have been unnecessary if lime had been used originally.
How We Apply Lime Plaster — Traditional Methods, Modern Precision
Survey & Material Specification
We assess the building's construction, age, and condition. We identify the original plaster type where possible and specify the appropriate lime system — non-hydraulic lime putty, or NHL 2, 3.5, or 5 depending on the exposure and substrate.
Preparation
Existing plaster is carefully removed to reveal the substrate. Masonry is raked out and repaired with lime mortar where needed. Surfaces are dampened to control suction — lime plaster must not dry too quickly.
Base Coat Application
A coarse base coat (scratch coat) of lime plaster mixed with sharp sand and hair is applied. The surface is scratched to provide a key for the next coat. This coat is left to cure slowly — typically 5–7 days minimum.
Finishing Coat
A finer finishing coat of lime putty and fine sand is applied and worked to the specified texture — smooth, floated, or textured depending on the building's period and your preference. Traditional tools and techniques are used throughout.
Curing & Protection
Lime plaster cures by carbonation, not evaporation. We protect fresh plaster from direct sun, wind, and frost — misting with water if necessary to slow the cure. The process takes weeks, not days, but the result lasts centuries.
Benefits of Lime Plastering for Period Properties
Breathable — Eliminates Trapped Damp
Lime plaster allows moisture to evaporate through the wall surface naturally. No trapped moisture means no damp, no mould, and no salt damage.
Structurally Appropriate
Lime plaster is softer and more flexible than gypsum. It moves with the building rather than cracking — essential for older structures that are never perfectly static.
Listed Building Compliant
Lime plaster meets the requirements of listed building consent and conservation area guidelines. We can provide material specifications for planning applications.
Lasts for Generations
Properly applied lime plaster carbonates over time, getting harder and more durable. Medieval buildings still have their original lime plaster — 600+ years old and still performing.
Authentic Period Appearance
Lime plaster has a soft, warm character that gypsum cannot replicate. The subtle surface texture and gentle undulations are what give period rooms their character.
Repairable Without Replacement
Damaged lime plaster can be patched and repaired using the same material. Repairs bond seamlessly with the original plaster — unlike gypsum patches on lime surfaces.
Lime Plastering Materials, Methods & Applications
Non-Hydraulic Lime Putty
Non-hydraulic lime putty is made by slaking quicklime with excess water and maturing it for a minimum of three months. It sets by carbonation — absorbing carbon dioxide from the air and slowly converting back to calcium carbonate (limestone). This is the most breathable and flexible lime type, ideal for internal plastering on listed buildings. We source mature lime putty from specialist UK suppliers — never quicklime that's been insufficiently slaked.
Natural Hydraulic Lime (NHL)
NHL limes contain natural impurities (silica and alumina) that give them a partial hydraulic set — they begin setting on contact with water, unlike non-hydraulic lime which only sets by carbonation. NHL comes in three strengths: NHL 2 (weakest, most breathable), NHL 3.5 (moderate), and NHL 5 (strongest, least breathable). We select the appropriate grade based on the substrate, exposure, and application. NHL 3.5 is the most commonly used grade for general lime plastering in London.
Hair-Reinforced Lime Plaster
Traditional lime plaster base coats are reinforced with animal hair (typically goat or horse hair). The hair fibres bridge micro-cracks as the plaster shrinks during curing, preventing the base coat from breaking up. We mix hair into our scratch coats at the traditional ratio — enough to reinforce without compromising workability. For conservation projects, hair reinforcement is often a specified requirement.
Lime Rendering (External)
External lime render uses the same principles as internal lime plaster but with aggregates and lime types selected for weather resistance. We use NHL 3.5 or NHL 5 for external renders depending on exposure. Hot lime mixes — where quicklime is mixed on-site with sand and gauged with water — are used on specific conservation projects where maximum breathability and authentic methodology are required.
When Lime Is Required vs Optional
Lime plaster is mandatory on listed buildings and most conservation area properties. It's strongly recommended on any pre-1919 solid-wall property originally built with lime mortar. On post-1930s cavity wall properties, modern gypsum plaster is usually appropriate. If you're unsure whether your property needs lime plaster, we'll assess it during our free survey and give you honest advice — we won't specify lime plaster unnecessarily.
We provide lime plastering services across London, Oxford, Henley upon Thames, Marlow, and surrounding areas. See also our standard plastering and rendering services.
Frequently Asked Questions
Your Period Property Deserves Lime Plaster Done Right
Get your free survey and lime plastering estimate. Authentic materials, traditional methods, and the expertise your building requires.