In short
- Lime render is vapour-permeable and relatively soft, so it lets solid walls dry out and accommodates slight movement.
- Cement render on a historic solid wall can trap moisture and damage soft brick, stone and timber.
- It is applied in several thin coats and needs protection from frost and fast drying for weeks after application.
- Listed buildings need listed building consent for most render changes; conservation areas bring their own controls.
Why lime matters on older Surrey buildings
Houses built before about 1919 generally have solid walls with no cavity. They manage moisture by absorbing it and letting it evaporate. Lime mortars and renders are part of that system. When these walls are covered in hard, impermeable cement render, water that gets in through cracks or rises from the ground cannot get out, and it ends up in the brick, the stone or the timbers.
That matters locally. Godalming, Farnham and Haslemere have large historic cores; villages across the Surrey Hills have timber-framed and stone cottages; and Guildford's own conservation areas contain many solid-walled buildings. Some of these carry decades-old cement render that is now causing damp. See rendering period and solid-wall homes.
How lime render is applied
Lime render is built up in coats, typically a scratch coat, a floating coat and a finish coat, each thinner and slightly weaker than the last. Natural hydraulic lime (NHL) sets partly by reaction with water and is more forgiving on site; non-hydraulic lime putty sets only by carbonation, slowly, and is used for the most sensitive work. Many lime renders are finished with limewash, a breathable traditional coating that is renewed every few years.
Lime work is weather-sensitive. It needs protecting from frost, rain and fast drying from sun and wind, often with hessian or scaffold sheeting, and is best carried out between spring and early autumn.
Consents
- Listed buildings: changing or removing render normally needs listed building consent from the planning authority, even like-for-like on some buildings. Work without consent is a criminal offence.
- Conservation areas: rendering a previously unrendered house is not permitted development and needs planning permission.
- Surrey Hills National Landscape: the same restriction on cladding with render applies. See planning permission for rendering.
Cost
Lime rendering is specialist and labour-intensive. Published 2026 ranges run from about £65 per m² for straightforward work to considerably more for multi-coat hand-applied renders on listed buildings. Removing old cement render carefully, without damaging the wall behind, adds time.
Questions people ask
Can I put modern render on my Victorian house?
It depends on the wall. Many Victorian houses have solid walls where lime or a breathable system is safer. We assess the wall first, and recommend a specialist building surveyor where a building needs one.
Should I remove cement render from an old cottage?
Often, if it is causing damp and the wall beneath can be protected. Removal needs care, as hard render can pull the face off soft brick. Take advice before starting, and check consents if the building is listed.
Does lime render need painting?
It is often finished with limewash, which needs renewing every few years. Do not use modern masonry paints on lime; they reduce breathability.
How long does lime render last?
Well-maintained lime render can last many decades. Limewash is sacrificial and is renewed periodically, which is part of how the system protects the wall.