Tub-to-shower conversion cost factors

A conversion is one of the most contained bathroom projects: one wall-to-wall alcove, a known footprint, usually no change to the rest of the room. That makes it predictable, and it means the cost comes down to a handful of clear decisions.

1. Stay in the footprint, or grow it?

A standard alcove tub leaves a space roughly 60 inches wide and a little over 30 inches deep. A shower built in exactly that space is the baseline. It uses a pan made for that size, it reuses the existing walls and the rest of the bathroom stays untouched.

Making the shower deeper or wider means moving a wall, taking space from a closet or vanity area, or both. That is where a conversion turns into a partial remodel, with the framing, drywall and flooring repairs that come with it.

2. The drain

A tub drain sits at one end. A shower drain can sit at the same end, at the center, or along the back wall as a linear drain. The closer the new drain stays to the old one, the lower the cost. On a concrete slab, which covers most houses in the Tampa area, moving it means breaking out concrete around the old tub drain and re-running the line, then patching.

The drain line size can also matter: tubs and showers do not always use the same size, and older homes may have pipe that needs replacing once it is exposed.

3. Pan type

4. Walls: tile or panels

The tub surround usually comes out entirely, including the backer behind it. What goes back decides a big part of the budget:

• Solid-surface or composite wall panels: few or no grout lines, quick to install, easy to clean. Fewer design choices.
• Porcelain or ceramic tile: the most common choice. Cost depends on size, pattern and height.
• Stone or handmade tile: the most labor, the most care in sealing and setting.

Tub surrounds are often tiled only to around the showerhead height. A shower looks more finished with tile taken to the ceiling, which adds area. It also helps in a humid Florida bathroom, since there is less painted drywall close to the spray. Shower wall materials compared goes through the options in detail.

5. Glass and entry

With a tub, a curtain or a sliding door on top of the tub wall was enough. A shower needs its own containment. The lowest-cost option is a curtain on a curbed base. A framed or semi-frameless slider is a step up. Heavy frameless glass with a hinged door sits at the top. A single fixed panel with an open entry works if the alcove is deep enough to keep water in.

6. Safety and comfort add-ons

Conversions are often done for easier access, so these come up a lot:

• grab bars, which need solid blocking in the wall (easy to add while the wall is open, harder later),
• a fold-down or built-in bench,
• a handheld shower on a slide bar,
• a slip-resistant floor tile or textured base,
• a low or zero threshold.

Blocking for future grab bars costs very little during a conversion and is worth including even if you do not install the bars yet. More ideas are in our aging-in-place design guide.

7. What is behind the tub

Tubs that have been re-caulked for years sometimes hide rotted framing, a damaged subfloor under the apron, or a leaking overflow. None of that is visible until the tub is out. A small allowance for repairs keeps the project calm when it happens.

Summary: what moves the number

If the tub is only there because it came with the house, a conversion is usually one of the best-value changes you can make to a bathroom. See how we approach a tub-to-shower conversion in Tampa, or read about walk-in shower designs if you are considering enlarging the space.