Quick answer
Yes, you can tile over existing tiles — but only if the old tiles are firmly bonded, flat and free of damp. In a real bathroom that’s rarely the case, so most of the time we’d strip back to a sound surface. Tiling over saves a day of mess; done on the wrong wall, it costs you the whole job a year later.
When tiling over old tiles actually works
There are situations where tile-on-tile is perfectly sound, and we’ll happily do it when the conditions are right. A good candidate is a wall where the existing tiles are modern, fully stuck down with no drummy or hollow patches, sitting flat with no big steps between them, and showing no sign of damp behind. A kitchen splashback or a low-traffic cloakroom wall often qualifies. If you tap across the wall and every tile rings solid, you’re already most of the way there.
The catch is preparation. You can’t bond new adhesive to a glazed, shiny surface and expect it to grip — the tiles have to be keyed (lightly abraded) and primed with a proper tile-on-tile primer so the adhesive has something to hold onto. Skip that and the whole lot can let go in a sheet. You also add the thickness of two tiles plus two beds of adhesive, which pushes the surface out from the wall and can foul window reveals, sockets and door frames.
Why we usually strip back instead
In most Plymouth bathrooms — particularly the 1960s–90s homes around Plympton, Plymstock and Peverell we work in a lot — the old tiles aren’t a clean canvas. They’re often loose in places, sitting on tired plaster, and hiding things you really want to see before you tile.
- Damp, blown plaster or rot behind the old tiles
- Hollow, drummy tiles that are already on their way off
- Uneven, lippy walls that telegraph through the new tiles
- Old waterproofing that’s failed in the wet zone
Stripping back lets us see and fix the wall, re-board or re-skim where needed, and waterproof the shower area properly before a single new tile goes up. It’s a day or two more work, but it’s the difference between a finish that lasts fifteen years and one that fails its first winter.
A sound, flat, waterproofed background is what makes tiling last — and it’s hard to guarantee that over old tiles you can’t see behind.
The cost trade-off
It’s tempting to think tiling over saves a lot of money, and it does shave off the strip-out and skip time. But the saving is smaller than people expect, and the risk sits entirely with you. If the new tiles come away because the old ones did, you pay twice — once to do it, once to put it right. A full bathroom in Plymouth runs £4,075–£10,870 (average around £6,340), with tiling typically £800–£3,500 of that depending on tile choice and area. Saving a few hundred pounds on prep is a false economy if it shortens the life of the whole job.
If your main goal is a fresh look without a full rip-out, there are honest middle routes — re-grouting and re-sealing, or a partial re-tile of just the wet zone. We’ll always tell you which is genuinely worth doing. For a full breakdown of what tiling costs in Plymouth, see our guide on how much bathroom tiling costs.
Common questions
Can you tile over tiles in a shower?
We’d strongly advise against it in the shower itself. The wet zone needs a continuous, sound waterproof layer behind the tiles, and you can’t guarantee that over old tiles you can’t inspect. In a shower we strip back, tank the area properly, then tile. See why waterproofing matters before tiling.
Do you have to remove old tiles before tiling a floor?
Floors are more forgiving than showers but more demanding on weight and height. We check the substrate can take the extra load and that the new finish won’t sit proud of the door threshold. Often it’s cleaner to lift the old floor and start from a known-good base.
How do you key tiles so new adhesive sticks?
The glazed surface is lightly abraded and primed with a dedicated tile-on-tile primer. This gives the adhesive a mechanical and chemical grip it would never get on a shiny glaze. It’s a non-negotiable step if tiling over is the chosen route.
Not sure which way to go on your bathroom? Our tiling & flooring service page explains how we assess a wall, and you can read more in our FAQs.
Honest advice, fixed price
Let us look at your tiles first
We’ll tell you straight whether your existing tiles are worth tiling over or better stripped back — then give you a written, fixed quote either way.