Why we keep coming back to lime plaster

Every studio has a material it argues for more often than it should. Ours is lime plaster — and after sixteen years of specifying it, the argument has stopped being about how it looks.

Painted plasterboard gives you a flat, even wall. That's the whole promise, and it's a good one for a rental or a fast fit-out. But a flat wall is a wall that has nothing to say once the furniture arrives. Lime is the opposite: it holds the trowel marks, it takes light differently at every hour, and it makes an empty room feel finished before you've hung a single picture.

It moves with the building

The practical case matters more than the aesthetic one. Lime is vapour-open — it lets moisture pass through the wall and evaporate rather than trapping it behind an impermeable skin. In a solid-wall Victorian house or a stone farmhouse, that is the difference between a wall that dries out each summer and one that quietly rots behind the paint.

It's also softer than the masonry it sits on, which sounds like a weakness and is in fact the point. When the building moves — and every building moves — the plaster cracks in fine hairlines and self-heals, instead of transferring the stress into the stone.

A wall you can repair with a bucket and a trowel will outlive one that has to be stripped and replaced.

What it costs, honestly

There's no point pretending it's cheap. Expect roughly two to three times the cost of skim and emulsion, most of it labour, and expect the programme to stretch — each coat needs to carbonate before the next goes on, which takes days, not hours.

• Three coats over a lath or stone substrate, six to ten weeks total on a whole-house scheme
• A skilled plasterer is non-negotiable — the finish is the trowel work
• Repairs are patch-and-blend, not strip-and-redo
• No repainting cycle: the colour is in the material, not on it

Where we don't use it

Wet rooms with continuous condensation, kitchens directly behind a hob, and any wall a client wants to be able to scrub. Lime is forgiving of moisture but not of abrasion. In those places we'd rather use tadelakt, tile, or simply a well-detailed painted surface — and keep the lime for the rooms where light does the work.

Sixteen years in, the thing that keeps us specifying it isn't the finish on handover day. It's walking back into a house five years later and finding the walls look better than they did in the photographs.