Can You Tile Over Tiles?
Yes. In most cases you can lay new tiles over old ones, as long as the existing surface is sound, clean and properly prepared. Here is when it works, when to tear out instead, and how to keep the job compliant with Australian Standards.
Ripping out old tiles is messy, slow and expensive. So it is no surprise that "can you just tile over the top?" is one of the most common questions we hear from Perth renovators. The honest answer is usually yes, but only when a handful of conditions are met.
Tiling over existing tiles can save you a full day of demolition, skip-bin fees and dust through the whole house. Done on the wrong surface, though, it can trap moisture, crack within months, or leave you paying twice. This guide walks through exactly when tiling over tiles is a smart move, when it is not, and what a compliant installation looks like in a wet area.
Key takeaways
- Yes, in most cases. Tiling over tiles is permitted under Australian Standard AS 3958.1 when the base is firmly fixed and structurally sound.
- The base tiles must pass a "tap test." Any tile that sounds hollow (drummy) or is cracked, loose or lifting has to be fixed or removed first.
- Waterproofing is the deal-breaker. In showers and wet areas you cannot inspect the original membrane, so a fresh AS 3740-compliant waterproofing layer is often required.
- Weight and height add up. A second tile layer adds roughly 20–25 kg per square metre and raises the floor, which can affect doors, drains and thresholds.
So, can you tile over tiles?
Yes. As of 2026, laying new tiles over existing tiles is allowed under Australian Standard AS 3958.1, provided the original tiles are firmly bonded to the substrate with no drummy or cracked areas, the surface is clean, and it is mechanically roughened and primed so the new adhesive can grip.
Ceramic and porcelain make a stable, rigid base to tile onto, often more stable than a fresh sheet of plasterboard or cement sheet. That is why professional tilers regularly tile over old tiles rather than tearing them out.
The catch is that a glazed tile is smooth and non-absorbent by design. New adhesive will not stick to a shiny, dusty or greasy surface. Preparation, not the tiling itself, is where most tile-over jobs succeed or fail.
When you can tile over tiles (and when you shouldn't)
Before anything else, tap across every existing tile with a coin or the handle of a screwdriver. A solid "tick" means it is well bonded; a hollow "drum" means it is lifting. Use the checklist below to decide whether to go ahead.
Go ahead
Tiling over tiles is generally fine when:
- The existing tiles are firmly fixed with no drummy or hollow-sounding spots
- There are no cracks, chips or lifting edges across the surface
- The wall or floor is flat and true, within standard tolerances
- The surface can be cleaned back to bare, grease-free tile
- Existing falls to the drain in a wet area are correct and working
- The floor structure can carry the extra weight without flex
Stop & reassess
Remove the old tiles first when:
- Tiles are drummy, cracked, loose or already lifting
- There is any sign of past or ongoing water damage or leaks
- The existing waterproofing is failing or its condition is unknown
- The floor already sits high against doors, vanities or thresholds
- The falls to the drain are wrong and need re-forming
- You are unsure whether the base is structurally sound
Wet areas are different. In a shower, bathroom floor or laundry, you usually cannot see or test the original waterproofing membrane hidden beneath the old tiles. If it has failed, water can track into wall frames and floor joists. For wet areas, most professionals recommend a fresh waterproofing layer compliant with AS 3740, or a full strip-out where there is any doubt.
Does tiling over tiles meet Australian Standards?
It can. Tiling over existing tiles is recognised under AS 3958.1, the Australian Standard for the installation of ceramic tiles, as long as the base is sound and correctly prepared. The standard sets out substrate condition, adhesive coverage and tolerances that a compliant overlay has to meet.
For wet areas there is a second, non-negotiable standard: AS 3740, which governs waterproofing of internal wet areas. Tiles and grout are not waterproof on their own; long-term performance relies on a compliant membrane underneath. On wet-area floors, AS 3958.1 also calls for 90–100% adhesive coverage with no voids around tile edges, which is critical when bonding to a smooth existing tile.
Why it matters in Perth. Bathroom and laundry work is regulated, and non-compliant waterproofing is one of the most common and most expensive building defects. Using a licensed tiler who works to AS 3958.1 and AS 3740 protects both your renovation and any future sale of the home.
How to prepare existing tiles for a new layer
Preparation is where a tile-over job is won. Whether you tackle a splashback yourself or brief a professional for a full bathroom, these are the steps that make new tiles bond and last.
Tap-test every tile
Check the whole surface for drummy or hollow tiles. Re-fix or remove any that are loose, cracked or lifting before going further.
Deep-clean the surface
Strip soap scum, grease, wax and grime with sugar soap, then rinse. New adhesive will not grip a dirty or greasy glaze.
Roughen & prime
Mechanically abrade the glaze or apply a tile-to-tile bonding primer so the smooth surface gives the adhesive a key to hold onto.
Address waterproofing & falls
In wet areas, confirm falls to the drain and apply an AS 3740-compliant membrane where needed before the new bed goes down.
Fix with the right adhesive
Use a flexible, tile-suitable adhesive and aim for full coverage (90–100% on wet-area floors) with no hollow voids under the tile.
Grout, seal & cure
Grout once set, seal where required, and allow full curing before the area gets wet or takes traffic.
The tile-over "sandwich"
A successful overlay is really a stack of well-bonded layers. Each one has to do its job for the finished surface to stay put. Here is the cross-section a Perth tiler is building on a wet-area floor.
Tile over the top, or tear out and start fresh?
Both approaches are valid. The right one depends on the state of your existing tiles and how much height and weight you can afford to add. Here is how they compare.
Tile over existing tiles
Best when the base is sound and you want to avoid a full strip-out.
- Far less mess, dust and demolition
- Faster, with no removal or substrate rebuild
- Lower labour and skip-bin costs
- Adds ~20–25 kg/m² and raises the floor height
- Hidden waterproofing can't be inspected
Remove and re-tile
Best when tiles are failing, the area leaks, or height is already tight.
- Fresh, verified waterproofing membrane
- Chance to correct falls, levels and layout
- No added floor height or extra load
- Messier, slower and higher labour cost
- The safer choice when anything is in doubt
What about the extra weight and floor height?
A second layer of tiling adds roughly 20–25 kg per square metre. Across a full bathroom that can be several hundred extra kilograms sitting on your floor structure, so the joists or slab need to carry it without flexing, since movement is a fast route to cracked tiles and grout.
Height is the other catch. Every new layer raises the finished floor by the thickness of the adhesive plus the tile, often 10–20 mm. That can foul door swings, leave a lip at thresholds, lower the gap under a vanity, and change how a floor meets its drain. On walls the same build-up can affect how tiles meet window reveals, benches and fittings. A good tiler checks all of this before committing to an overlay.
Not sure if your tiles are good to go over?
The WA Kajaria Ceramics team can assess your existing tiles, advise whether an overlay is the right call, and handle supply and professional installation across Perth and Western Australia, compliant with AS 3958.1 and AS 3740. Bring us a photo or book a look in person.
Tiling over tiles: common questions
Can you tile over tiles in a shower or wet area?
You can, but wet areas carry more risk because the original waterproofing membrane is hidden beneath the old tiles and can't be inspected. If it has failed, water can reach the wall frame or floor. Most tilers recommend a fresh AS 3740-compliant membrane, or a full strip-out where there is any doubt.
How do I know if my existing tiles are suitable to tile over?
Tap across the surface with a coin. A solid sound means the tile is well bonded; a hollow "drummy" sound means it is lifting. Suitable tiles are firmly fixed, crack-free, flat and cleanable. Any loose, cracked or damaged tiles must be re-fixed or removed before a new layer goes on.
Do you need special adhesive to tile over tiles?
Yes. Because glazed tiles are smooth and non-absorbent, you need a flexible, tile-suitable adhesive and usually a tile-to-tile bonding primer so it can grip. On wet-area floors, AS 3958.1 calls for 90–100% adhesive coverage with no voids around the tile edges for a lasting bond.
How much extra height does tiling over tiles add?
Each new layer adds the thickness of the adhesive plus the tile, commonly around 10–20 mm. That may sound small, but it can affect door clearances, thresholds, the gap under a vanity and how the floor meets its drain, so it needs checking before you start.
Is it cheaper to tile over tiles than to remove them?
Usually, yes. Skipping demolition cuts labour time, dust and skip-bin costs, which is why tiling over tiles is popular. But if the base is failing or a wet area leaks, tiling over it can cost far more later. When tiles are unsound, removing and re-tiling is the more economical choice long term.
Can you tile over floor tiles as well as wall tiles?
Both are possible. Floors add the extra consideration of load and height. The structure must carry roughly 20–25 kg/m² more without flexing, and the raised level must still work with doors and drains. Walls are usually more forgiving, but the base tiles still need to be firmly fixed and properly prepared.
Does tiling over tiles meet Australian Standards?
It can. Overlaying tiles is recognised under AS 3958.1 when the base is sound and correctly prepared, and wet areas must also satisfy AS 3740 for waterproofing. Using a licensed tiler who works to both standards keeps the job compliant and protects the value of your home.
References
- Standards Australia. AS 3958:2023, Ceramic tiles: Guide to installation. Retrieved 2026-07-21, store.standards.org.au
- Australian Tile Council. Australian Tiling Standards (AS 3958.1 & AS 3740). Retrieved 2026-07-21, australiantilecouncil.com.au
- Ace Tiling Sydney. Tile Over or Tear Out? Pros and Cons of Tiling Over Existing Tiles. Retrieved 2026-07-21, acetilingsydney.com.au
