Pebbledash: Remove It, or Render Over It?

Pebbledash went onto an enormous number of British houses between the 1920s and the 1970s, and a lot of people have spent the years since wanting rid of it. The good news is you have options. The bad news is that the cheap option is not always available to you, and finding out which camp you are in takes five minutes with a knuckle.

First, test what you have

Walk the elevation and tap it. Use your knuckles or the handle of a screwdriver, and cover the whole wall rather than one convenient patch at eye level.

• A sharp, solid note means the render is still bonded to the wall behind it.
• A dull, hollow, drummy note means it has let go. The pebbledash is hanging on rather than stuck on.

Then look at the edges and low level:

• Cracks wide enough to get a fingernail into
• Loose stones coming away when you brush a hand across
• Sections that have already fallen off, especially near the ground or under sills
• Green or black staining, which tells you water is sitting somewhere it should be running off

Option one: render over the top

If the pebbledash is genuinely sound across the whole elevation, a system can be applied over it. The surface is prepared and keyed, a basecoat with mesh goes on to level and reinforce it, and the finish goes over that.

Why people choose it. It avoids the mess, the noise and the labour of removal, and there is no waste to take away. It is the quicker and less disruptive of the two routes.

The condition. Sound across the whole elevation, not sound in most places. Building over a hollow section means the new render is bonded to something that is already failing, and when the old layer eventually lets go it takes your new finish with it. That is a genuinely expensive way to save money.

Option two: take it off

Removal takes the pebbledash back to the masonry underneath, which is then made good and rendered fresh.

Why people choose it. You start from a known surface. Any damage, previous patching or hidden damp is visible and can be dealt with properly. The wall thickness does not build up, so reveals, sills and drips keep their original proportions rather than getting swallowed.

The reality. It is dusty, noisy work and it generates a lot of waste. It takes longer and it costs more. And occasionally it uncovers something that needs attention before rendering — which is inconvenient, but a great deal better than sealing it in.

When removal is not optional

Some situations make the decision for you:

• Large drummy or hollow areas anywhere on the elevation
• Pebbledash that has already come off in patches
• Signs of damp behind the existing finish
• Render bridging the damp-proof course, or sitting too close to ground level
• Cracking that follows a line rather than spreading as random crazing — that needs looking at properly before anything covers it

What it looks like afterwards

Both routes end in the same place aesthetically: a flat, modern, even finish in the colour you choose. The difference is what is underneath and how long it lasts.

Rendering over sound pebbledash is a sensible saving. Rendering over failing pebbledash is a deposit on doing the whole job again.

Get yours checked properly

Tapping the wall yourself will tell you roughly which way this is going, but the edges, the base and the areas above head height are where the answer usually hides.

Send photographs of each elevation and anywhere you have spotted cracking, loose stones or staining, and mention anything you already know about the property's history. You will get a written recommendation covering which route your walls actually need, what it involves and what it costs — with no obligation to book anything.