Quick answer
Replace the bathroom when the problem is in the structure or spread across the room: failed waterproofing, a floor that moves, mould that keeps coming back, or a layout that no longer works. Repair when it is one fitting, a cracked tile or a worn seal.
The deciding question is the waterproofing. Once the seal under the tiles has failed, there is no lasting fix without lifting the floor, and at that point a full renovation is usually the better spend.
| What you are seeing | Repair or replace? |
|---|---|
| One cracked tile or a dripping tapA single, contained fault. | Repair |
| Water stains on the ceiling belowA sign the seal has failed. | Replace |
| Mould that keeps coming backOften poor sealing or no fan. | Usually replace |
| The layout does not workNo storage, tight clearances. | Replace |
| Dated look, everything worksThe room is sound. | Repair or refresh |
Not sure which you need? A free on-site measure tells you whether a repair will hold or the room needs rebuilding.
When is a repair enough?
A repair is the right call when the fault is small and contained. A cracked tile, a dripping tap, a worn silicone seal or a loose towel rail can each be fixed on their own without touching the rest of the room.
The test is simple: is the room sound apart from this one thing? If the waterproofing is holding, the floor is firm and the layout works, there is no need to rebuild. Fix the fault and the bathroom carries on.
When should you replace the bathroom?
Replace the room when the problems are spread out or sit in the structure. Failed waterproofing, a floor that flexes or moves, mould you cannot get rid of, and tiles coming away in more than one spot all point past a repair.
These faults feed each other. Damp from a failed seal rots the floor, which cracks more tiles, which lets in more water. Patching one part does not stop the cycle. Our guide to why mould keeps coming back shows how this builds up.
The waterproofing test
The clearest sign you need to replace rather than repair is water showing up where it should not: stains on the ceiling in the room below, a musty smell, or paint bubbling on the other side of a shower wall. These mean the seal under the tiles has failed.
There is no lasting surface fix for failed waterproofing. The floor has to come up so the room can be sealed again to AS 3740 and certified. Our guide to the waterproofing certificate explains what a proper reseal involves.
When the layout is the real problem
Sometimes nothing is broken and the room still does not work. There is nowhere to store things, the door hits the vanity, or two people cannot use the space at once. A repair cannot fix a layout, only a renovation can.
If the room is sound but cramped, it is worth weighing a rebuild that moves the fittings against living with it as is. Our guide to small bathrooms and when to move plumbing cover what a new layout can and cannot change.
What does it cost to replace?
A full renovation costs more up front than a repair, but it resets the whole room and its lifespan. A string of repairs on a failing bathroom often adds up to more than one rebuild would have cost, with the same problems returning in between.
Our package prices and size bases show where a full bathroom starts, and our guide to what changes the cost explains what moves the price for your room.
How we help you decide
You do not have to work this out alone. At the free on-site measure we check the waterproofing, the floor and the layout, and tell you honestly whether a repair will hold or the room needs rebuilding. We would rather you knew than spent on a fix that will not last.
If a renovation is the answer, you then get a fixed-scope written quote. If a repair will do, we will say so. Our guide to choosing a renovator covers what honest advice should look like.
Frequently asked questions
Can I just replace the tiles and keep the rest?
Only if the waterproofing under them is sound. New tiles over a failed seal will leak again, because the problem is the layer beneath, not the tiles. Lifting the tiles is also when hidden damage is usually found.
How do I know if my bathroom waterproofing has failed?
The common signs are water stains on the ceiling in the room below, a musty smell, bubbling paint on the far side of a shower wall, or tiles sounding hollow. Any of these means water is getting past the seal.
Is it cheaper to repair or replace a bathroom?
A single repair is cheaper than a renovation. But repeated repairs on a failing room often cost more over time than one rebuild, because the underlying problem keeps coming back.
How old should a bathroom be before you renovate?
There is no set age. Many bathrooms are renovated at 15 to 20 years, but the trigger is the condition, not the age. A sound older bathroom can be left, and a poorly built newer one may need replacing sooner.
Why does mould keep coming back in my bathroom?
Usually because damp is not clearing. A weak or missing exhaust fan, poor ventilation or a failed seal lets moisture sit in the room. Cleaning treats the surface, but the damp has to be fixed to stop it returning.