If the tub in your bathroom mostly holds a shower curtain and a few bottles, it’s taking up space you don’t use. Stepping over that tub wall every morning gets old, and for some people it gets harder each year. A tub-to-shower conversion replaces the tub with a shower built around how you actually bathe.

What changes when the tub comes out

The tub and the wall surface around it come out down to the framing. Most built-in tubs sit in an alcove about 60 inches long and 30 to 32 inches deep, and California’s plumbing code specifically allows a shower of at least 30 by 60 inches, so the space you already have usually works.

The drain is the part that surprises people. Tubs drain through a 1-1/2-inch outlet, while the code calls for at least 2 inches on a shower, so the floor at the drain is usually opened to change the trap. On a concrete slab that means opening a small area of concrete around the drain; on a raised floor the work happens through the subfloor or from the crawlspace.

The valve often changes too. A tub valve sits low on the wall, so it’s commonly raised for a shower-only setup, and the spout opening is closed behind the new wall. If your tub still has separate hot and cold handles, the replacement will be a pressure-balancing or thermostatic valve, which California requires on showers to limit scalding. Drain and valve work is done by licensed plumbing trades we coordinate, with the details confirmed at your in-home consultation.

Choices that shape the new shower

The base

A preformed acrylic or composite base drops into the alcove, sheds water well and has no grout to clean. A tiled floor built over a waterproof pan lets you choose the tile, the drain style and the exact size. Our comparison of tile and acrylic showers goes deeper on upkeep and appearance.

The entry

Keeping a curb is the straightforward option. California’s plumbing code sets a standard curb at 2 to 9 inches above the top of the drain, and one at the low end of that range is much easier to step over than a tub wall. Going curbless means lowering the floor under the shower, a bigger job that’s evaluated during the consultation.

Walls, glass and storage

Tile walls can include a recessed niche for bottles, while solid panels have fewer seams to keep clean. A 60-inch opening takes a sliding bypass door, a hinged door beside a fixed panel, or a single fixed panel that leaves part of the entry open. A hinged door needs room to swing past the toilet and vanity, and the code requires any shower door to leave at least 22 inches of clear opening.

While the walls are open, ask for solid blocking where a grab bar or fold-down seat might go someday. It’s simple to add now and difficult once the tile is finished.

Whether to keep a tub somewhere

Before you give up a tub, consider whether it’s the only one in the house. Small children are easier to bathe in a tub, and some buyers look for at least one. Converting one bathroom while keeping a tub in another is a common middle ground.

Older bathrooms: cast iron, mortar beds and hidden damage

If your house dates from the 1950s through the 1970s, the tub may be enameled cast iron. These tubs are very heavy and are often broken into pieces in place rather than carried out whole. The tile around them may be set in a thick bed of mortar, which takes more effort to remove than modern backer board.

Removing the tub also reveals what it was hiding: the framing at the tub edge, the subfloor and the drain line. Old galvanized or cast-iron piping, or wood that has stayed wet for a long time, should be shown to you and agreed on before a new shower is built over it.

A window in the tub wall becomes a window in the shower. California’s residential code treats glass next to a tub or shower as a hazardous location when its bottom edge is less than 60 inches above the standing surface, so it needs safety glazing, and a wood window in a wet wall needs a plan for water.

How a conversion shows up in your estimate

In the bathroom estimator, choose “Tub to Walk-In Shower” on the shower or tub question. That answer adds a shower glass question: “Add Custom Glass” covers a frameless or custom enclosure, and “No Additional Glass” fits a curtain or glass that’s already part of your plan.

If the shower stays in the tub’s footprint, “Keep the Same Layout” fits. For plumbing and electrical, a conversion where the valve moves up the wall and the drain stays in place is usually “Minor Changes,” while moving the drain or valve to a different wall is “Major Changes.” Your size, tile, vanity and finish answers describe the rest of the room.

What shapes the investment

A conversion is priced as part of the whole bathroom, so there’s no separate number for the shower alone. Whole bathroom projects with All American usually begin around $15,000 and typically land near $25,000; once a project adds layout changes and premium selections, $30,000 to $40,000 is a realistic planning figure.

Where your project falls depends on tile versus panels, custom glass, how much of the room changes beyond the shower, how far the plumbing moves, and what turns up under the old tub. Our guide to tub-to-shower conversion cost walks through those factors.

How the project runs

After your estimate, the in-home consultation is where the alcove is measured, the drain and valve are checked, permit needs are confirmed and selections are settled. You get a clear plan and schedule before anything is torn out.

The work follows a set order: demolition, plumbing changes, any inspection the permit calls for, the shower base and waterproofing with a water test, then tile or panels and trim. Frameless glass is measured after the walls are finished, so it’s usually the last piece installed.

When a full remodel makes more sense

If the vanity, floor and lighting are as dated as the tub, doing them together avoids tearing into a finished room twice. The same goes for moving the toilet or enlarging the shower beyond the alcove, which involves licensed plumbing work and may need a structural evaluation. Our comparison of a tub-to-shower conversion versus a full bathroom remodel helps you decide.

You can also see everything a bathroom remodel can include. If a larger, low-threshold design appeals to you, read about walk-in showers next.