"Do I need to replace the whole thing or can it be fixed?" is the most common question we get on shower base damage. The answer is usually fixed. But there is a smaller set of cracks where the honest answer is replace, and confusing the two costs money.
This post walks through how to tell which one you have, based on the cracks we see weekly across Melbourne bathrooms.
What a shower base actually is
A shower base (sometimes called a shower tray or shower pan) is the moulded floor unit at the bottom of a shower. In Australian bathrooms, they come in three main materials:
- Acrylic (most common, 1990s to today). Lightweight, formed plastic, often with a reinforced bottom.
- Enamel-on-steel (older installs, 1970s to 1990s, also some current premium products).
- Stone composite or moulded resin (premium and newer installs).
Tiled shower floors are different. Those have a cement substrate with a waterproof membrane underneath and tiles laid over the top. Cracked tiles on a shower floor is a tile repair problem, not a shower base problem. We cover tile crack repair separately at /services/tile-repair.
The two kinds of damage
Most shower base damage falls into one of two categories.
Category A: Surface damage. A chip, a hairline crack, a stress crack from foot pressure on flexing acrylic, a worn-through finish in the high-traffic centre. The damage is cosmetic or shallow. Water is not getting through to the substrate. This is what we repair every day.
Category B: Through-base damage. A crack that goes through the full thickness of the base. Water is leaking into the floor cavity. The cause is usually structural (the base is sitting on uneven substrate and flexing under weight, or the cement bed has shifted, or the base was poorly installed). This is a plumbing and waterproofing problem first, with the surface as a downstream symptom.
The trap: a category A crack and a category B crack can look identical from above. A spider crack on the floor of an acrylic shower base might be 1mm deep cosmetic damage, or it might extend through the back of the base where you cannot see it.
How to tell which kind you have
Three quick checks before you start spending on quotes.
Check 1: Run water on the base for 10 minutes, then check underneath. If you can access the underside of the shower base (some installs have an access panel from a wardrobe or under-stair cupboard; many do not), look for moisture, drip marks, or visible water staining on the framing or floor below. If there is water there, you have a category B leak.
Check 2: Look at the wall behind the base. Stand outside the bathroom, against the wall that backs the shower. Run a hand along it at floor level. Damp wall plaster, paint blistering, skirting board lifting away from the wall, or a musty smell are all category B signals. The leak has been happening for a while.
Check 3: Look at the floor outside the bathroom. For ground-floor bathrooms over a slab, this rarely surfaces. For first-floor bathrooms over a timber-framed floor, ceiling damp downstairs (yellow staining, paint flaking, sagging plasterboard) directly under the shower is a category B leak going through to the floor cavity.
If all three checks come up clean and the crack only appears on the visible top surface, the damage is almost certainly category A. We can repair it.
If any check shows moisture or damp, stop and call a plumber before any surface repair. We do not fix leaks. A surface repair over an active leak hides the symptom and lets the structural damage continue underneath.
What a category A repair looks like
For surface damage on an acrylic, enamel, or stone-composite shower base, the repair is the same family of work as bath chip repair:
- Mask the surrounding area and the wall corners.
- Sand the crack edges to roughen the bond surface.
- Apply two-part epoxy filler matched to the base colour.
- Build up in layers, slightly proud of the surface, with 8 to 12 minutes between coats.
- Sand and polish back to the surrounding finish.
- For larger areas, finish with a thin coat of base-matched topcoat for uniform sheen.
For a moderately damaged shower base, this is usually a 90 minute to 2 hour job. Most repairs in Melbourne sit between $380 and $680 depending on damage area and base material.
For a full shower-base resurface (the whole base re-coated, like new), price runs $980 to $1,420. We do this when there are multiple cracks, the original surface is worn through across the centre, or a colour refresh is wanted.
Why not just replace it?
Three reasons we hear:
Reason one: replacement looks fast. A plumber and a tiler can swap an old acrylic shower base for a new one in 2 to 3 days. That sounds simple compared to "investigate the crack, decide on repair, schedule the trade." For category A damage it is not, and we will explain why.
Reason two: the plumber's first quote was for replacement. Plumbers are not in the surface repair trade. Their default for visible damage is replace, the same way a stonemason defaults to replace for a chipped benchtop. The category A vs B distinction is not their daily problem to solve.
Reason three: water damage is scary. A customer sees a crack, worries about a leak, and the safe-feeling answer is replace. The crack might be category B, in which case yes. But if the checks above show no moisture, replacement is solving a problem that does not exist.
For comparison, the typical replacement cost for a shower base in Melbourne:
- Acrylic shower base unit: $400 to $1,200
- Plumber: $600 to $1,400 (disconnect, set base, reseal, retest)
- Tiler: $1,400 to $3,200 (the surround tile lip almost always needs partial retile after a base swap)
- Waterproofing re-do: $400 to $700
- Bathroom downtime: 3 to 7 days
Total: typically $2,800 to $6,500.
A category A repair sits at $380 to $680. The price gap on the same damage profile is 5 to 10x.
The honest "replace it" cases
We will tell you to replace, not repair, if:
- Any of the three water-leak checks above came up positive (category B damage; this is a plumber's job, not ours).
- The base is fibreglass or low-grade acrylic over 25 years old with widespread flex cracks. The repair will hold; the surrounding base will keep cracking elsewhere. Replacement is more economical over a 3-year window.
- You are renovating the bathroom anyway. Repair on a base that is being ripped out next month is wasted money.
- The base material is a niche product (some imported fibre composites) where we cannot reliably colour-match. Rare, around 1 in 30 quotes.
We say so up front in the quote. We will not sell you a repair on a base that should be replaced.
When to call a plumber instead of us
Call a plumber, not Surface Fix, if:
- Water is visibly leaking from the base.
- The bathroom has unexplained damp smells.
- The plaster or paint downstairs (for first-floor showers) is damp or stained.
- The crack runs through the drain area or through the side wall of the base (those usually indicate substrate movement).
A leak is a plumbing and waterproofing problem first. Once the plumber has confirmed the base is structurally sound and waterproof, we can come in and address the cosmetic surface. About 1 in 5 customers who first reach out to us about a "cracked shower base" end up needing a plumber first. We tell them honestly and refer to a specialist.
Quote a shower base repair
Send 1 to 2 photos through the form at surfacefix.com.au/quote. Include the full base in one shot and a close-up of the crack. If you can also send a photo of underneath the base or the wall behind it, that helps us assess category quickly. We come back with a written quote within 24 hours, including an honest answer on whether it is repair or "see a plumber first".
FAQ
Will the repair last as long as a new base? The repair sets hard and holds up in normal use. The base underneath keeps its original lifespan. We have category A repairs in Melbourne homes from 2020 that still look the same as completion day.
Can you repair a shower base while the rest of the bathroom is in use? For the work itself, yes (90 minutes to 2 hours on-site). The shower needs to be left dry for 24 hours after a chip repair, 48 hours after a full resurface. The rest of the bathroom (vanity, toilet, bath) is fine to use throughout.
Why is the colour-match different on shower bases vs baths? Shower bases are usually white, almond, or biscuit. Bath colours have wider variation. The match deck is the same, the process is the same; the typical match window is narrower because shower base colours cluster around 5 to 8 standard shades.
Can you reach the back corner of an enclosed shower? Yes. We mask the doorway and work from inside the shower enclosure. For very tight glass-screen showers, we sometimes need the screen lifted off temporarily; that adds 30 minutes to the job and the customer or a plumber needs to handle the screen if it is sealed.
What if I am not sure whether it is category A or B? Send the photos. We will tell you. If we cannot tell from the photos, we recommend a 5-minute moisture-meter check on a plumber's visit before we quote.
Last reviewed 2026-05-26 by Ben, Founder of Surface Fix. We repair surfaces across Melbourne and Victoria.