How much does a tub-to-shower conversion cost?

Cost depends heavily on drain work, pan type, and enclosure choice.

Do I need a permit to convert a tub to a shower?

In most jurisdictions, yes — because drain line modifications and waterproofing changes typically require plumbing permits and inspection sign-off.

Can my existing drain line be reused?

Only if it already meets the 2-inch minimum required for shower use. Most tub drains are 1.5-inch and need to be upsized during conversion.

How long does a typical conversion take?

Timelines vary by scope — a straightforward pan swap on an existing drain moves faster than a curbless conversion requiring subfloor recessing.

Tub-to-Shower Conversion

An old tub that’s rarely used is dead weight in a bathroom. For many people, it is wasted square footage, a slip hazard, and a plumbing bottleneck if the drain isn’t sized for a shower pan. Koalaty Bath connects homeowners with vetted local contractors who handle tub-to-shower conversions as a full plumbing and waterproofing job, not just a fixture swap.

Upgrade Your Bathroom With a Professional Tub-to-Shower Conversion

Grout-Free Composite Systems and Antimicrobial Tech

Composite systems like Sentrel and cross-linked acrylic are becoming a popular choice among homeowners. If you’re looking for grout-free options for your bathroom, non-porous systems like Sentrel are the way to go. They are infused with antimicrobial silver-ion technology, eliminating the mold growth and recurring maintenance costs associated with porous grout lines.

Get a Tub-to-Shower Conversion Estimate

The Drain Mandate Most Contractors Skip

A standard tub uses a 1.5-inch trap and drain line. Converting to a shower isn’t a matter of pulling the tub and dropping in a pan. Most plumbing codes, including the IRC and UPC, require a 2-inch drain line for shower installations. This allows them to handle the higher, more consistent water flow rate of an open shower versus a tub’s batch drain.

Skipping this upsizing is one of the most common corner-cutting shortcuts in the industry, and it’s the reason “quick” tub-to-shower jobs end up with standing water or slow drains within a year.

Koalaty Bath vets bathroom remodeling contractors to ensure that they verify existing drain line diameter before quoting and include the line upsizing in the scope, not as a change order discovered mid-demo.

Subfloor and Framing Checks
When bath remodelers remove cast-iron or steel tubs, they tend to find subfloor damage that has been hidden for years. A vetted contractor hired through Koalaty Bath will take the time to inspect for soft spots, rot, or inadequate joist support before framing the new shower base or curb. A leak-free pan means nothing if it’s sitting on compromised subfloor and it is important to have a pro who will pay close attention to this damage.

Compare Tub-to-Shower Conversion Options Before You Remodel

Why Vetting Matters for This Specific Job

A tub-to-shower conversion fails for one of two reasons: bad drain sizing or bad waterproofing. Koalaty screens every contractor in its network for:

Plumbing Licensing — verified for drain relocation and line-sizing work, not just fixture installation
Waterproofing Method — bonded membrane systems with documented flood testing, not just a coat of paint-on sealant
Code Compliance — current on local drain-sizing and slope requirements
Transparent Pricing — itemized quotes covering demo, plumbing, waterproofing, and finish work separately

What Drives the Cost of a Conversion

Pricing on a tub-to-shower conversion depends on a handful of technical variables, not just square footage:

Drain relocation or upsizing — moving the drain or expanding it to 2-inch code minimum adds plumbing labor
Pan type — prefabricated acrylic pan vs. a custom mortar-bed pan with linear drain
Threshold style — standard curb, low-threshold, or fully curbless (curbless requires floor recess work)
Glass enclosure — framed, semi-frameless, or frameless glass, each with different install complexity
Wall system — tiled and waterproofed with a bonded membrane vs. a composite panel system

Because pricing swings widely based on these factors, Koalaty Bath’s vetted pros [insert links when it is live] provide itemized, line-by-line quotes rather than flat estimates — homeowners can see exactly what they’re paying for.

Design a Safer, More Accessible Bathroom With a Walk-In Shower

FAQs About Tub-to-Shower Conversion

How much does a tub-to-shower conversion cost?
Cost depends heavily on drain work, pan type, and enclosure choice.
Do I need a permit to convert a tub to a shower?
In most jurisdictions, yes — because drain line modifications and waterproofing changes typically require plumbing permits and inspection sign-off.
Can my existing drain line be reused?
Only if it already meets the 2-inch minimum required for shower use. Most tub drains are 1.5-inch and need to be upsized during conversion.
How long does a typical conversion take?
Timelines vary by scope — a straightforward pan swap on an existing drain moves faster than a curbless conversion requiring subfloor recessing.

Upgrade Your Bathroom With a Barrier-Free Shower