Tiling over existing tiles is one of the questions we get asked most on bathroom and kitchen quotes around Lee-on-the-Solent and Gosport. The short answer is yes, it can be done and done well, but only if the original tiles are sound. Here is how we decide on real jobs, and when we advise ripping the old ones off instead.
If the existing tiles are solidly bonded, flat and dry, tiling over them can save a day or more of labour, a skip load of waste and the mess of hacking off. That matters in older properties around the Solent coast, where hacking tiles off can pull chunks of plaster or original render away with them, turning a quick refresh into a full replastering job.
The wall behind still needs to be up to the total weight. Plastered walls carry roughly 20kg per square metre of tiling, and a layer of old ceramic plus new tiles and adhesive can use most of that. A second layer of lightweight ceramic on a brick or blockwork wall is usually fine; heavy porcelain or natural stone over existing tiles rarely is.
If more than a handful of tiles sound hollow when tapped, the adhesive bond is failing and anything fixed on top will fail with it. We also strip back when there has been a leak, because tiling over trapped moisture in a bathroom just seals the problem in. Shower enclosures are the highest risk area, so we are stricter there than on a kitchen splashback.
Depth is the other dealbreaker. Adding a tile layer around 10mm thick pushes everything outwards. Sockets and switches on a kitchen wall need extending, door architraves and window boards can end up sitting behind the tile line, and bath edges or shower trays lose their neat overlap. Sometimes the maths simply does not work and removal is the cleaner job.
Preparation decides whether tile on tile lasts twenty years or two. The old glazed surface is degreased thoroughly, because years of soap film or cooking residue will stop any adhesive gripping. We then either mechanically abrade the glaze or apply a purpose-made gripper primer such as BAL Grip or a similar acrylic bonding coat, and fill any missing tiles or low spots so the new bed is even.
Adhesive choice matters just as much. It must be a flexible cement-based adhesive rated for tile on tile; standard ready-mixed tub adhesive from a DIY shed is not suitable over a glazed surface and is the most common cause of the failures we get called out to fix. New joints are offset from the old ones so grout lines do not stack, and edges are finished with trim to hide the doubled thickness.
Every job is different, but as a rough guide tiling over sound existing tiles on a typical splashback or half-height bathroom wall can trim 10 to 20 percent off the tiling labour, mainly by avoiding removal, waste disposal and making good the wall afterwards. Hacking off often uncovers blown plaster, and skimming or reboarding a bathroom can add a few hundred pounds plus drying time before tiling can start.
That said, we never recommend overlaying just to save money if the survey says the base layer is doubtful. Redoing a failed tile on tile job costs more than doing the strip out properly the first time. When we quote refits locally we look at the walls, tap test the tiles and give you both options in writing so you can weigh the saving against the risk.
Only if the existing tiles are perfectly sound and there is no history of leaks, and even then we are cautious. Showers take the most water punishment, so in most refits we strip back and fit a waterproof tanking layer before retiling.
Sometimes, but the floor must be rigid and the extra height has to work with doors, thresholds and appliances. Doors usually need trimming, and integrated dishwashers or washing machines can end up trapped under the worktop, so floors need extra care at the survey stage.
Yes. You need a flexible cement-based adhesive suitable for low-porosity surfaces, used with a gripper primer over the old glaze. Ready-mixed tub adhesives will not bond reliably to glazed tiles and are the usual reason overlaid tiling fails.
Call, email or WhatsApp a few photos of the job. We will come back to you with an honest opinion and a clear price.
Lee-on-the-Solent, Gosport, Stubbington, Hill Head, Fareham, Portchester, Warsash and along the Solent coast.