Most shower-versus-tub advice is written in resale dollars. We are not going to do that, because no federal source publishes a resale premium for either choice, and the figures that circulate come from trade surveys rather than measurement.
There is federal data on something more consequential, and it points the decision somewhere different: this is the most dangerous room in the house, and the fixture you choose is where most of that risk sits.
What the injury data actually says
The CDC reported that in 2008 an estimated 234,094 non-fatal bathroom injuries were treated in US emergency departments among people aged 15 and over. Falls accounted for 81.1 percent of them, and 68.3 percent of injuries occurred in or around the tub or shower.
Those are 2008 figures published in 2011 and we are not updating them, because a newer national count of this kind is not available and inventing a 2026 number would be worse than citing a dated one honestly. What the data establishes is a proportion rather than a trend: the bathing fixture, not the floor generally, is where the injuries concentrate.
That reframes the decision. The question is not which fixture returns more at sale. It is which fixture the people living in this house can enter and leave safely for as long as they intend to stay.
The federal standard that does not exist
There is no mandatory federal slip-resistance rule for adult bathtubs and showers. The voluntary standard that once covered slip resistance in adult tubs, ASTM F462, was withdrawn in 2016.
So a product marketed with a slip-resistance grade is not citing a federal requirement, and any lettered traction scale presented as an official rating is not one. Texture and finish are still worth asking about; just treat the answer as a manufacturer claim rather than a certification.
What CDC does recommend is concrete: grab bars inside and outside the tub or shower, and next to the toilet. That is a specification you can hand a contractor, and it costs very little at the point of construction.
Reinforcing now, bars later
The most useful thing to take from accessible-design practice is a sequencing point rather than a dimension. HUD’s Fair Housing Design Manual, addressed to covered multifamily housing and not to single-family code, treats the reinforcing inside the wall as the item that goes in during construction. The bars themselves come later, when and if they are wanted.
That is exactly the right shape for a private remodel too. Blocking behind the tile costs almost nothing while the wall is open and is expensive and destructive to add afterwards. Ask for reinforcing at the tub or shower surround and beside the toilet whether or not anyone currently wants a bar there.
Two more points from the same HUD manual, and both are labelled covered-multifamily guidance rather than requirements for a single-family house. Where a stall is the only bathing fixture, the manual describes a minimum of 36 by 36 inches with a 30 by 48 inch clear floor space at the control wall. Those numbers are worth knowing as a sanity check on whether a proposed stall is usable, not as a code you are obliged to meet.
Which fixture, honestly
| Consideration | Tub | Curbless or low-threshold shower |
|---|---|---|
| Getting in and out | Requires stepping over a raised wall, which is the movement most associated with the fall data above. | No step or a low one. This is the main argument for it, and it is a safety argument rather than a style one. |
| Small children | Bathing a small child is materially easier in a tub, and this is a real constraint for some households for a decade. | Workable but awkward at the youngest ages. |
| Waterproofing burden | The tub contains most water; the surround still needs a proper backer. | Higher. A curbless design puts more of the room in the wet zone and depends entirely on the membrane and slope. |
| If it is the only bathing fixture | Some buyers with small children expect at least one tub in a house. | Check the stall is genuinely usable rather than minimal. |
Row three is the one that costs money quietly. A curbless shower is a waterproofing project before it is a fixture, and it is the wrong place for the paper-faced backer substitution described in our note on where budget jobs fail. What it does to a bid is covered in what drives a bathroom bid.
Questions readers actually ask
Does removing the only tub hurt resale?
No federal source measures it, so any percentage you are quoted comes from a trade survey rather than from data we would cite. What is documented is that households with small children often want a tub. Treat it as a question about your likely buyer rather than a number.
Are walk-in showers safer than tubs?
The CDC data shows falls were 81.1 percent of bathroom injuries and 68.3 percent occurred in or around the tub or shower, and stepping over a tub wall is the movement that concerns people planning to age in place. That is a reason to prefer a low or absent threshold, alongside grab bars. It is not a guarantee, and no federal slip standard exists to certify any product as safe.
Where should grab bars go?
CDC advises grab bars inside and outside the tub or shower and next to the toilet. Even if you do not want them now, have the walls reinforced during the remodel. Adding blocking behind finished tile later is a demolition job.
How small can a shower stall be?
HUD’s manual, as guidance for covered multifamily dwellings, describes a minimum 36 by 36 inch stall with a 30 by 48 inch clear floor space at the control wall where the stall is the only bathing fixture. Single-family work is governed by your local code rather than by that manual, but the dimensions are a reasonable test of whether a stall will actually be comfortable.
Sources
4
Every figure in this article traces to a government record or to a named independent, non-commercial research body. We do not cite insurance marketplaces or affiliate comparison sites for data.
- Centers for Disease Control and Prevention Nonfatal Bathroom Injuries Among Persons Aged 15 Years and Over, United States, 2008 (MMWR) Published 2011-06-10Supports: An estimated 234,094 nonfatal bathroom injuries were treated in US emergency departments in 2008 among persons aged 15 and over; falls accounted for 81.1 percent; 68.3 percent of injuries occurred in or around the tub or shower. These are 2008 data published in 2011 and are cited as such, not updated.
- Centers for Disease Control and Prevention Preventing Falls Published 2026-01-27Supports: Install grab bars inside and outside the tub or shower and next to the toilet.
- U.S. Consumer Product Safety Commission Voluntary Standards: Bath Tubs, Adult Published 2026-01-01Supports: There is no mandatory federal slip-resistance standard for adult bath tubs and showers; ASTM F462 was withdrawn in 2016.
- U.S. Department of Housing and Urban Development Fair Housing Act Design Manual, Chapter 7 Published 1998-01-01Supports: Guidance for COVERED MULTIFAMILY DWELLINGS, not single-family code: where a stall is the only bathing fixture it should be at least 36 by 36 inches with a 30 by 48 inch clear floor space at the control wall; reinforcing for grab bars, rather than the bars themselves, is installed at construction. Labelled as multifamily guidance throughout the article.
Figures last verified August 30, 2026.