Regrout when the tiles are sound and only the grout is tired, and retile when the waterproofing behind those tiles has failed. Getting that call right is the difference between spending a few hundred dollars or several thousand, so it pays to read the signs properly before you commit.
This guide gives you a clear decision framework, the Adelaide cost bands for each option, and the tests you can do at home to tell which camp your bathroom falls into. It sits within our complete guide to bathroom tiling in Adelaide.
The short answer
A regrout is a surface fix. It rakes out the old grout lines and replaces them, so it works only when the tiles and the waterproofing beneath them are still doing their job.
A retile is a structural fix. It strips the tiles back, renews the waterproofing membrane and lays fresh tiles, so it is what you need once water has found its way behind the wall or floor.
The mistake we see most often in Adelaide bathrooms is regrouting a problem that is actually a waterproofing failure. It looks fixed for a few months, then the same staining, smell or movement comes straight back, and you have paid twice.
When a regrout buys you years
Reach for a regrout when the damage is cosmetic and the bones are still good. Signs you are in regrout territory:
- The grout is stained, discoloured or patchy, but the tiles do not move
- A few grout lines are cracked or crumbling in high-traffic spots
- The tiles sound solid when tapped, with no hollow or drummy note
- There is no soft or spongy feel underfoot and no bulging walls
- No musty smell, no bubbling paint on the other side of the wall, no water marks on the ceiling below
In those cases a regrout genuinely resets the clock. On sound tiles over an intact membrane, a quality regrout commonly lasts 8 to 12 years, and refreshing the silicone in the corners and along the bath at the same time keeps water where it belongs. It is one of the best value jobs in a bathroom, and you can see how it fits alongside larger work on our tile and grout regrouting service.
When the waterproofing is gone and you must retile
Grout is not waterproof. It never was. The waterproof membrane sits underneath the tiles, and grout is only the visible filler between them. So once that membrane fails, no amount of new grout will stop water tracking through.
Signs the waterproofing has failed and a regrout will not save you:
- Tiles that are drummy, lifting, or move when you press them
- A floor that feels soft, spongy or slightly springy underfoot
- Persistent musty smell that returns no matter how often you clean
- Water stains, bubbling paint or peeling on the wall behind the shower or the ceiling of the room below
- Efflorescence (white powdery salts) creeping out of grout lines
- Silicone and grout that fail again within months of being redone
If you tick two or more of these, the honest answer is almost always a full retile. The tiles come off, the substrate is checked and repaired, a fresh membrane goes down to Australian Standards, and new tiles are laid over the top. It is more disruptive and more expensive, but it is the only fix that actually holds. This is especially true in a fully tiled shower or wet room, where the tiling and waterproofing work as one system.
Regrout vs retile: the quick comparison
| | Regrout | Full retile | | --- | --- | --- | | Fixes | Tired, stained or cracked grout | Failed waterproofing and lifting tiles | | Touches the membrane | No | Yes, fresh waterproofing | | Typical Adelaide cost | $400 to $900 | $2,500 to $6,500+ | | Time on site | Usually 1 to 2 days | Usually 1 to 2 weeks | | Disruption | Low, bathroom back in use quickly | High, room out of action | | Lasts | 8 to 12 years on sound tiles | 15 to 20+ years done properly |
Regrouting is roughly $400 to $900 for a bathroom, while a full retile lands in the $2,500 to $6,500 or more range because it includes tile removal (about $20 to $40 per square metre), fresh waterproofing ($500 to $1,500 for a wet area) and new tiles. For a full breakdown of what a retile costs and what drives it, see our guide to bathroom tiling costs in Adelaide.
The 5-minute home test
Before you book anyone, spend 5 minutes checking your own bathroom so you walk into quotes knowing roughly what you are dealing with.
- Tap test. Gently tap across the tiles with a knuckle or the back of a spoon. A solid, dull sound is good. A hollow or drummy note means the tile has lost its bond, which points to a bigger problem.
- Press test. Push firmly on the floor tiles, especially near the shower. Any flex, movement or spongy feel is a red flag for water damage underneath.
- Smell and sight. A musty smell that will not shift, or bubbling paint and stains on the far side of the wall, means water is already getting through.
- Grout check. If the grout is simply dirty or lightly cracked but everything else is sound, you are likely a regrout candidate.
If everything checks out and the grout is your only complaint, a regrout is a smart, affordable choice. If more than one test raises a flag, budget for a retile and do not let anyone talk you into a regrout as a patch over a leak.
A word on choosing tiles if you do retile
If a retile is on the cards, it is also your chance to fix layout and light. Larger tiles mean fewer grout lines to maintain, and the right choice can make a small room feel bigger, which we cover in our guide to the best tiles for a small bathroom. Since you are already re-waterproofing, doing the tile selection well now saves regret later.
Get the right call from a vetted Adelaide tiler
The safest way to know whether you need a regrout or a full retile is to have a licensed tiler look at it in person, because a genuine waterproofing failure is not always obvious from the surface. Tell us about your bathroom and we will connect you with vetted Adelaide tilers for regrouting or a full bathroom retile, who will assess it honestly and quote for the fix you actually need, free and with no obligation. Compare free quotes now and choose with confidence.