Plastering a listed building in Devon

What the listing actually covers

This is the bit people get wrong. A listing covers the whole building, inside and out, not just the front elevation.

That includes the plaster. Original lime plaster, lath and plaster ceilings, cornices, and the render on the outside are all part of the listed fabric. Hacking off original lime plaster and replacing it with gypsum board is an alteration to a listed building.

It also covers anything within the curtilage, so outbuildings and walls can be caught by it too.

When you need consent

Listed building consent is needed for any work that affects the building's character as a building of special interest. In practice, for plastering, that usually means:

Replacing original lime plaster or render with a different material. Removing lath and plaster ceilings. Removing or altering cornices and mouldings. Rendering a wall that was not rendered, or removing render from one that was.

Straight like-for-like repair in the same materials is generally more straightforward, but the safe answer is always to ask the conservation officer first. They would far rather have a phone call before the work than a complaint afterwards.

The penalties are real

Carrying out unauthorised works to a listed building is a criminal offence, not a planning technicality. It can lead to prosecution, and the council can serve an enforcement notice requiring you to put it back.

Putting a gypsum-skimmed, cement-rendered cottage back to lime, at your own cost, on a deadline, is not a position anyone wants to be in.

And there is a quieter risk: it will come up when you sell. Buyers' solicitors ask about listed building consent, and works that were never consented can hold a sale up or knock the price down.

Why lime is usually required anyway

Even leaving the law out of it, the technical answer is the same.

A listed Devon cottage is almost always cob, stone or solid brick, with lath and plaster ceilings. Those walls have no damp proof course and they were never meant to have one. They manage water by letting it move through and evaporate.

Seal that up with gypsum inside and cement outside, and the moisture goes somewhere else, which is usually into the timber. Rotten wall plates and beam ends in a listed building are a considerably more expensive problem than plaster.

So the conservation officer asking for lime is not being awkward. They are asking for the thing that will not wreck the building.

How we work on listed buildings

We work on listed and period property across Devon regularly, and the process is straightforward.

We look at what is actually there before quoting, because what is under the surface on an old building is rarely what you expect. If consent is likely to be needed, we say so at that point rather than after starting.

We work in lime where lime is what the building wants. And if the honest answer is that you need a conservation officer's view before anyone does anything, we will tell you that too.