Replace Bathtub with Walk in Shower: Costs, Steps, and What to Know

The tub-to-shower conversion is one of the most popular bathroom remodels in America, and if you never take baths, it is an easy call. When you replace bathtub with walk in shower, you reclaim a cramped alcove, gain a bigger, more usable bathing space, and often improve accessibility for aging in place. The catch is that it is more than a swap; you are relocating a drain, extending waterproofing up the walls, and sometimes moving plumbing valves.

I have done these conversions in weekend-warrior bathrooms and in full gut remodels, and the price swing is enormous depending on how far you go. A basic prefab conversion can run $3,000 to $6,000, while a custom tiled curbless shower with a linear drain and a glass enclosure can hit $10,000 to $18,000. Let me break down exactly where the money goes, the technical steps, and how to decide which route fits your home.

Should You Keep at Least One Tub?

Before you demo anything, think about resale. Real estate agents consistently advise keeping at least one bathtub in the house, usually in a main or kids’ bathroom, because families with young children often want one. If this is your only tub, converting it can narrow your buyer pool. But if you have a second tub elsewhere, or the bath in question is a primary en suite, a walk-in shower is a strong upgrade that most buyers prefer. For aging homeowners, the accessibility gain almost always outweighs the resale concern.

The Real Cost Breakdown

Here is where the dollars actually land on a typical conversion:

• Demolition and disposal: $300 to $800 to remove the old tub, tile, and surround.
• Plumbing changes: $500 to $1,500 to relocate the drain from the tub’s end position to a shower’s center or offset, and to swap the tub valve for a shower valve.
• Waterproofing and pan: $500 to $1,500 for a membrane system and either a prefab base or a mortar-bed shower pan.
• Wall surface: $400 (acrylic panels) to $2,500+ (custom tile) for the walls.
• Glass enclosure: $700 to $2,500 for a frameless or semi-frameless door and panel.
• Fixtures: $200 to $800 for the showerhead, valve trim, and any grab bars or bench.

A prefab acrylic conversion keeps you at the low end and can be installed in two to three days. A tiled custom shower is a week or more of work and lands at the high end.

Prefab vs Tiled: Choosing Your System

Your first big decision is acrylic or tile. Each has a real case.

Acrylic or Solid-Surface Systems

Prefab bases and wall panels go in fast, cost less, and have no grout to maintain. Brands like Sterling, Swanstone, and Onyx make solid, low-maintenance kits. The trade-off is a more limited look and fewer size options. This is the smart choice for a budget conversion or a rental.

Custom Tile

Tile lets you build any size, add a bench or niche, and get exactly the look you want, but it costs more and demands flawless waterproofing. A tiled shower done right with a membrane like Schluter Kerdi or a liquid membrane will last decades; done wrong, it leaks behind the walls. Hire someone who understands shower waterproofing, not just any tile setter.

Curbed vs Curbless

A standard walk-in shower has a low curb, typically 3 to 4 inches, to contain water. A curbless (zero-threshold) shower removes that step entirely for a seamless, roll-in entry that is ideal for wheelchairs, walkers, and aging in place. Curbless looks stunning and modern, but it requires recessing the shower pan into the subfloor, which usually means cutting and reframing floor joists, adding $1,500 to $4,000 to the project. A linear trench drain along one wall is the usual pairing, since it lets you slope the floor in one direction only.

Step-by-Step: How the Conversion Goes

1. Shut off water and demo: Cap the supply lines, then remove the tub, tile, and cement board down to the studs. Inspect for hidden water damage while the walls are open.
2. Relocate the drain: A tub drain sits at one end; a shower drain usually needs to move to the center or a corner. This means opening the floor and reworking the P-trap and drain line, ideally to a 2-inch drain for good flow.
3. Move or update the valve: Swap the tub-and-shower valve for a shower-only valve set at a comfortable height, around 48 inches. Add a handheld or rainhead line if you want one.
4. Frame and block: Add blocking in the walls for grab bars and a bench even if you do not install them now; it costs almost nothing during the open-wall stage and future-proofs the room.
5. Set the pan and waterproof: Install a sloped pan (prefab or mortar), then waterproof the pan and walls with a tested membrane system. Flood-test the pan for 24 hours.
6. Surface the walls: Install acrylic panels or tile. For tile, set backer board, waterproof, then tile and grout.
7. Install glass and trim: Fit the enclosure, valve trim, showerhead, and any grab bars. Caulk all changes of plane with silicone, not grout.

Plumbing and Code Details That Matter

A few technical points separate a lasting conversion from a callback. Use a 2-inch drain line for a shower; the 1.5-inch line a tub often uses can struggle with a high-flow showerhead and lead to pooling. Slope the pan a consistent 1/4 inch per foot to the drain. Modern shower valves should be pressure-balancing or thermostatic to prevent scalding, which is code in most jurisdictions. And if you add a bench or grab bars, blocking behind the wall must support at least 250 pounds of load.

Accessibility Upgrades Worth Adding

• Grab bars: $30 to $80 each installed on blocking, not just drywall anchors.
• Built-in or fold-down bench: Handy for shaving legs or for anyone who needs to sit.
• Handheld showerhead on a slide bar: Flexible for seated bathing and easy cleaning.
• Curbless entry with a linear drain: The gold standard for roll-in access.
• Non-slip floor tile: Small-format tile with more grout lines, or a textured pan, for wet-floor traction.

Timeline and Living Through It

A prefab conversion is typically two to three working days. A custom tiled shower is one to two weeks once you account for waterproofing cure time, tile setting, grout cure, and glass, which is usually templated after tiling and takes a week to fabricate. Plan for your bathroom to be out of service for the duration and line up a backup shower.

Does It Add Value to Your Home?

A well-executed tub-to-shower conversion generally holds its value, but the return depends on context. In a primary or en suite bathroom, a modern walk-in shower is a strong selling point; buyers increasingly expect a spacious shower in the main bath and will pay for one. In an aging-in-place scenario, the accessibility of a curbless or grab-bar-equipped shower can be the feature that lets someone stay in their home longer, which is value that does not show up on an appraisal but matters enormously.

The caveat, again, is your only tub. If converting leaves the house with no bathtub at all, you can actually hurt resale with families who want one for young children. The market-smart move is to keep a tub in a secondary or kids’ bathroom and convert the primary. Do that, and you get the best of both: a luxurious shower where you want it and a bathtub preserved where buyers expect it.

Quality of execution drives value as much as the decision itself. A conversion with proper waterproofing, a frameless glass enclosure, a niche, and tasteful tile reads as a genuine remodel and commands a premium. A cheap acrylic surround with a builder-grade door reads as a patch job. If resale is a priority, invest in the finishes that photograph well and signal quality: frameless glass, large-format or well-laid tile, a linear drain, and a clean, uncluttered layout. Those details are what make a buyer stop scrolling.

The Bottom Line

Replacing a bathtub with a walk-in shower is a high-satisfaction remodel that modernizes the room and improves daily use, especially if you never soak in the tub. Keep at least one tub elsewhere in the house for resale, budget honestly for the drain relocation and waterproofing that make the job more than a simple swap, and decide early between fast, affordable acrylic and fully custom tile. Do the waterproofing right and add blocking for future grab bars while the walls are open, and your new shower will serve you well for the next 20 years.