Lime plaster vs gypsum plaster: what your Swindon home needs
How lime and gypsum plasters differ, why period Swindon walls need breathable lime, and where modern gypsum multi-finish is the right call.
Updated 2 September 2026
Gypsum plaster is the default for modern Swindon homes: fast, predictable and cheap to work at the standard £230/day rate. Lime plaster is the right material for pre-1920 solid-wall houses (Old Town terraces, sarsen cottages on the Ridgeway fringe) because it lets moisture move through the wall instead of trapping it. But pick by price alone and the wrong material stores up damp that blows the finish within a few winters. So choose by wall construction and age, not by price alone. That said, the default earns its place: for most homes built with a cavity, gypsum is the correct material, full stop — and this guide has no interest in selling lime where it does nothing. Listed or conservation-area buildings are outside this guide too: changing finishes there may need consent and a conservation specialist.
The short answer: lime or gypsum?
Cavity-wall or timber-frame house of any era, or a solid wall that is dry and damp-free: gypsum multi-finish over plasterboard is the straightforward choice. Pre-1920 solid masonry — brick, stone or sarsen — that was originally lime: stay with lime, because an impermeable gypsum coat on a breathable wall traps damp and eventually blows the finish. If you are unsure what your walls are made of, a plasterer who works on period properties can tell within minutes of looking.
The two materials compared
The practical differences that decide the job are breathability, stiffness and speed. Lime is slower in every sense — slower to apply, slower to cure between coats, slower to reach full strength — which is why lime work is quoted as its own job rather than at the standard daily-area rate.
| Lime plaster | Gypsum plaster (multi-finish) | |
|---|---|---|
| Breathes (vapour-open) | Yes: manages moisture in solid walls | No: impermeable finish |
| Suits | Pre-1920 solid brick/stone, heritage work | Modern cavity walls, plasterboard |
| Application pace | Slower; coats need long curing gaps | About 18 m²/day skim rate |
| Movement tolerance | Flexible: tolerates old-wall movement | Rigid: cracks if the wall moves |
| Finish | Textured, soft, traditional | Flat, hard, paint-ready |
| Cost profile | Premium: more visits and skill | Standard £230/day labour |
Why breathable walls need lime
Older solid walls were designed to get wet and dry out: rain is absorbed by the masonry and evaporates away through the render or plaster. Lime finishes keep that path open. Sealing such a wall behind gypsum and modern paints does not stop the moisture — it just moves the damp line inwards, showing as blown patches, salt stains and mould. The failure then gets blamed on the plasterer, when the material choice set it up years earlier.
Where gypsum is the right answer
Everything built with a cavity — most of Swindon from the 1930s onward — is designed to keep the inner leaf dry, so an impermeable finish is exactly right. Gypsum multi-finish over plasterboard is fast, gives the flat modern look buyers expect, and is what the standard day-rate pricing assumes. Moisture-resistant boards extend the same system to bathrooms and kitchens.
Mixed and borderline cases
Real houses throw up hybrids: an Old Town terrace with a 1980s extension, or a cottage where a previous owner already skinned the originals in gypsum. Each wall can carry the correct material for its construction — lime on the old solid wall, gypsum on the modern blockwork extension. Reversing a past gypsum skin on a breathable wall is a bigger job (the impermeable coat has to come off) and is worth a specialist opinion before you commit.
Getting the right quote
Say what your house is and ask the plasterer directly whether they would use lime or gypsum on it, and why. A tradesperson who reaches for multi-finish on an 1890s solid-brick wall without asking questions is telling you something. Whatever the material, compare written quotes against how to choose a plasterer and check that lime work is priced as its own job, not squeezed into a day-rate skim quote. That closes the loop the guide opened: the question was never "lime or gypsum?" in the abstract — it is "what is my wall made of?", and the answer picks the material for you.
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Sources & further reading
Lime plaster vs gypsum plaster: what your Swindon home needs: quick questions
Can I put gypsum plaster over lime plaster?
It can be done and often is, but on a wall that takes moisture it stores up failure: the gypsum blocks evaporation and damp blisters the finish from behind. On a dry, sheltered internal wall it may hold for years — on a weather-facing solid wall it usually will not. Ask for a breathability opinion before agreeing to it.
Is lime plaster more expensive than gypsum?
Yes. Lime costs more per bag and takes longer to apply and cure, so the labour content is higher and the job spans more visits. Quotes vary with wall condition, so treat any online figure as a prompt for a written quote rather than a price.
How do I know if my Swindon house originally had lime plaster?
Age is the strongest clue: pre-1920 solid brick, stone or cob walls were almost always finished in lime. Soft, slightly textured old plaster that scratches with a fingernail is likely lime; hard, flat, chalky-white plaster is usually gypsum. A plasterer or heritage specialist can confirm on sight.
Is lime plaster better for older properties?
On solid walls built to breathe, yes: it is not nostalgia, it is moisture management. On cavity-wall homes there is no benefit to offset the extra cost, and gypsum is the practical choice.