The tub that never gets used
There is a familiar pattern in houses built between roughly 1960 and 2000: a standard five-foot alcove tub in the hall bath, with a shower head over it, used exclusively as a shower by everyone in the household for the last fifteen years. It is a bad shower — a high step over the tub wall, a cramped footprint, a curtain or a set of sliding doors with a track that collects grime — and a tub that is functionally storage.
Converting it is one of the highest-return projects in a bathroom, because it changes daily experience substantially while touching a contained portion of the room. You get a wider, safer entry, a genuinely usable footprint, and a surface that is far easier to clean than a tub-with-doors arrangement.
Where conversions go wrong is when they are treated as a surround swap. Pulling the tub and installing a shower correctly is a plumbing and waterproofing project. The drain moves. The floor structure gets opened. A pan gets built and sloped. A membrane goes in and gets flood tested. The tile is the last ten percent of that sequence and the only part anyone photographs.
What actually happens, step by step
- Tub and surround removal. Cast iron tubs are usually cut apart in place rather than carried out whole; steel and acrylic come out intact. The surround comes off down to the studs.
- Inspection of what is behind it. Water staining on the studs and sill, soft subfloor at the tub apron, and mold behind the old surround are common. Damaged framing gets replaced now.
- Drain relocation. The waste line is rerouted from the tub position to the new shower drain location, maintaining slope, with the trap set at the correct depth for the pan assembly.
- Floor structure work. For a curbed shower, blocking and reinforcement as needed. For curbless, the joists or slab are recessed so the finished shower floor lands flush with the bathroom floor.
- Valve and supply rough-in. New valve body at the chosen height, plus supply for a handheld or second head if specified, and the diverter if there is one.
- Blocking. Solid backing behind grab bar locations, the bench if there is one, and wherever the glass panel will anchor.
- Pan and waterproofing. Sloped mortar bed or pre-formed foam pan, then the membrane system, with corners, seams and the drain flange treated as the critical details they are.
- Flood test. The pan is plugged and filled and has to hold for twenty-four hours. This is the gate. Nothing is tiled over a pan that did not pass.
- Tile, grout and seal. Floor, walls, niche, curb or threshold, then grouting and sealing after cure.
- Glass and fixtures. Glass is measured against finished tile, fabricated, then installed with the trim and hardware.
Shower base options compared
The base is the decision that most affects both cost and longevity. All four of these are legitimate; they are not interchangeable.
| Base type | How it works | Best suited to | Trade-off |
|---|---|---|---|
| Acrylic or solid-surface pan | A pre-manufactured one-piece base set in mortar, with tiled walls above it. | Standard alcove footprints where budget and speed matter and the drain can stay near center. | Fixed sizes and drain positions. No design flexibility, but the fewest possible failure points. |
| Pre-formed foam pan | A factory-sloped foam base bonded to the subfloor and waterproofed with a bonded sheet or liquid membrane. | Most tiled shower conversions. Consistent slope without relying on a hand-floated mortar bed. | Costs more than mortar. Must be paired with the manufacturer's own membrane system to keep the warranty intact. |
| Traditional mortar bed | Deck mud floated to slope over a liner or under a topical membrane, drain set to match. | Odd-shaped footprints, oversized showers and anywhere a pre-formed pan simply will not fit. | Entirely dependent on the installer's skill. Excellent when done right, and the most common source of failed pans when not. |
| Curbless with linear drain | Recessed floor structure with a slope to a trench drain, usually along one wall, giving a flush entry. | Accessible design, primary bathrooms and anywhere a flat entry is the goal. | The most involved and most expensive option, because it requires modifying the floor structure itself. |
When we tell people to keep the tub
Not every tub should go, and we would rather say so before the demolition than after. Keep it if it is the only tub in the house and you have young children or expect to sell to families. Keep it if the bathroom is small enough that the resulting shower would be under about thirty by thirty inches, which is a worse daily experience than the tub was. Keep it if it is an original cast iron tub in sound condition, because those are genuinely better than most of what replaces them and refinishing costs a fraction of a conversion.
Convert it if the tub is used only as a shower, if stepping over the wall is becoming a mobility question, if the surround or the pan is already leaking, or if the house has another tub elsewhere.
Details worth specifying
- Bench or no bench. A built-in bench must be sloped and fully waterproofed as part of the assembly. A folding teak seat mounted to solid blocking gives you the same function without adding a failure point.
- Niche placement. Position it on a non-plumbing wall where possible, and size it around the tile module so the layout does not end in slivers. It is framed at rough-in, not chosen at tile time.
- Handheld on a slide bar. Inexpensive at rough-in and the single most useful addition for cleaning the shower and for anyone who later needs to sit while bathing.
- Glass type. Frameless looks best and needs precise tile and solid anchoring. Semi-frameless is more forgiving and cheaper. A fixed panel with no door works well on larger walk-ins and eliminates the hardware entirely.
- Floor tile texture. Small-format tile with more grout lines, or a tile with a rated slip resistance, matters more on a shower floor than anywhere else in the house.
If the reason for converting is mobility, plan the whole room rather than just the shower — entry width, turning space, grab bar blocking and fixture heights all interact. That is covered on our accessible bathroom remodeling page.
Conversions are frequently the moment homeowners realize the rest of the room is dated too. If that happens, we will scope both and let you decide — Friendswood Professional Remodelers prices a conversion and a full renovation separately so the comparison is honest.