That builder-grade bathtub you never actually take baths in is prime real estate — and converting it into an open, curbless or low-threshold shower is one of the most requested bathroom remodels in the country. Replacing tub with walk in shower not only modernizes the look of the room and makes it feel larger, it also improves accessibility as you age in place. But it’s more involved than swapping a fixture, touching plumbing, waterproofing, and sometimes the floor and walls. Knowing what the project entails helps you budget realistically and decide whether to DIY parts of it or hire out.
Part of our Bathroom Remodeling & Flooring guide — explore the full guide →
Here’s how the conversion works, what it costs, and the decisions you’ll face along the way.
Why Homeowners Make the Switch
The appeal goes well beyond looks. The most common reasons people convert:
- Accessibility: Stepping over a high tub wall becomes harder with age or mobility issues. A low or zero-threshold shower is far safer.
- Space and openness: A glass-enclosed walk-in shower makes a small bathroom feel bigger and more spa-like than a bulky tub.
- Actual usage: Most households shower daily and rarely bathe, so the tub is wasted space.
- Resale in the right market: If the home still has another tub, buyers often value a beautiful walk-in shower in the primary bath.
One caution on resale: real estate wisdom says keep at least one bathtub in the house, since families with small children often want one. Convert a secondary or primary bath, but think twice about removing your only tub.
The Basic Steps of a Tub-to-Shower Conversion
Whether you hire a contractor or tackle it yourself, the project follows a predictable sequence:
- Demolition: Remove the old tub, surround, and any damaged backer board. Cast-iron tubs are heavy and often need to be broken up to carry out.
- Plumbing changes: The tub drain sits at one end; a shower needs a centered or repositioned drain, and the tub spout is removed. This usually means opening the floor and adjusting the drain line and valve.
- Framing and base: Install a shower pan or build a mortar base sloped to the drain. Prefab acrylic or fiberglass pans speed this up; tile showers require a proper sloped mortar bed and liner.
- Waterproofing: Apply a waterproof membrane or cement backer board with a liquid membrane on all wet walls. This step is non-negotiable — skip it and you’ll get rot and mold.
- Surface finish: Set tile, or install acrylic/solid-surface wall panels.
- Glass and fixtures: Add the shower door or a frameless glass panel, mount the showerhead, valve trim, and any niche or bench.
Shower Base Options
The base you choose drives both cost and installation difficulty:
Prefabricated Acrylic or Fiberglass Pan
A one-piece molded base that drops in and connects to the drain. Affordable ($200 to $600), quick to install, and low-maintenance with no grout lines. The trade-off is limited size and style options.
Tiled Mortar Base
A custom sloped bed you tile over, allowing any size, shape, and a curbless entry. It’s the premium look but requires skilled waterproofing and costs more in labor and time.
Curbless (Zero-Threshold)
The floor of the shower sits flush with the bathroom floor for a seamless, accessible entry. This usually requires recessing the subfloor to hide the slope, so it’s best planned during a bigger remodel.
What It Costs
Prices vary widely by materials and whether you DIY. Realistic ranges:
- Basic acrylic conversion (DIY): $1,500 to $3,000 in materials
- Mid-range with prefab pan and tile walls (contractor): $4,000 to $8,000
- Custom tiled walk-in shower with frameless glass: $8,000 to $15,000+
- Curbless/accessible conversion with subfloor work: $10,000 to $20,000
Labor typically accounts for 40 to 60 percent of a professional job. Plumbing changes, especially moving the drain, and any tile work are where costs climb.
Plumbing Considerations
The most technical part of the conversion is the plumbing. A tub drain is offset to one end and larger; a shower drain usually centers under the showerhead area and connects to a 2-inch line for good drainage (versus 1.5-inch for many tubs). You’ll typically need to:
- Reposition or extend the drain and upgrade to a 2-inch trap for a shower’s flow.
- Replace the tub/shower valve with a shower valve, or reuse a compatible valve while capping the tub spout outlet.
- Confirm the slope of the new drain line meets code (usually 1/4 inch per foot).
This is where many homeowners bring in a licensed plumber even if they DIY the tile, since a mistake here means leaks inside the wall or floor.
Design Tips for a Great Result
A few choices elevate the finished shower:
- Go frameless or use a single fixed glass panel for an open, airy feel that maximizes the sense of space.
- Add a niche for shampoo and soap so you’re not relying on hanging caddies.
- Include a bench or fold-down seat for comfort and accessibility.
- Use large-format tile to minimize grout lines and cleaning.
- Install a linear drain for a modern look and easier curbless entry.
- Choose a handheld plus fixed showerhead combo for flexibility and easier cleaning.
DIY or Hire a Pro?
An experienced DIYer can handle an acrylic pan-and-panel conversion over a long weekend, keeping the plumbing changes minimal. But a custom tiled, curbless, or drain-relocating job involves waterproofing and plumbing that, done wrong, leads to expensive water damage. For those, hiring a licensed contractor and plumber is the wiser route.
How Long the Project Takes
Timeline depends on the scope. A basic acrylic pan-and-panel conversion, with no drain relocation, can be done in two to four days. A custom tiled shower runs longer because of curing times — mortar beds, waterproofing membranes, thinset, and grout each need to set before the next step. Here’s a realistic breakdown for a mid-range tiled conversion:
- Demolition and haul-away: 1 day
- Plumbing changes and inspection: 1 to 2 days
- Base, waterproofing, and cure time: 2 to 3 days
- Tile setting and grouting: 2 to 3 days with curing between
- Glass measurement and install: Often a separate visit a week or more later, since custom glass is fabricated to order
All told, plan on one to two weeks for a professional tiled conversion, and don’t forget the glass lead time when scheduling.
Permits and Code
Because a tub-to-shower conversion involves plumbing changes and waterproofing, many jurisdictions require a permit, especially when you move a drain or alter supply lines. Pulling a permit means an inspector checks the drain slope, the waterproofing, and the venting before the walls close up — which protects you from hidden leaks and helps at resale, since undocumented work can raise questions with buyers. Skipping the permit to save time and money is a common temptation, but a failed DIY waterproofing job discovered later costs far more than the permit ever would. If you’re hiring a contractor, confirm they pull the proper permits and that the work will be inspected. For accessibility-focused conversions, also check whether local or federal programs offer any grants or tax considerations for aging-in-place modifications, which can offset part of the cost.
The Bottom Line
Replacing a tub with a walk-in shower transforms how a bathroom looks and works — opening up the space, improving safety, and matching how you actually use the room. Budget anywhere from $1,500 for a simple DIY acrylic swap to $15,000 or more for a custom tiled, curbless design, and pay close attention to waterproofing and drain plumbing, the two areas where corners cut come back to haunt you. Keep one tub somewhere in the house for resale, plan your base and glass carefully, and you’ll gain a shower you’ll enjoy every single morning.
Aging-in-Place Features Worth Adding
If part of your reason for converting is to make the bathroom safer for the years ahead, build in accessibility while the walls are open — it’s far cheaper to add these now than to retrofit later. Consider installing solid blocking behind the tile so grab bars can be mounted anywhere they’re needed, even if you don’t add the bars immediately. A built-in bench or fold-down seat lets you shower seated, and a curbless or low-threshold entry removes the tripping hazard of stepping over a lip. A handheld showerhead on a slide bar works whether you’re standing or seated, and lever-style or thermostatic valves are easier to operate than round knobs while preventing sudden temperature swings. Slip-resistant floor tile with a higher texture rating adds traction where water pools. None of these features look institutional anymore — done well, they blend seamlessly into an attractive modern shower while quietly making the space usable for decades and for family members of any age or ability.
