Walk-in tub or shower conversion: choosing for a California home

Families usually start with the product they have heard of. The better starting point is the person. How do they move right now? Do they sit to bathe, or do they prefer to stand? Do they use a cane, a walker or a wheelchair? Will a spouse or a paid caregiver help? Once you have those answers, the choice between a walk-in tub and a shower often becomes clear.

The three options in plain terms

Walk-in tub

A deep tub with a watertight door in its front or side wall. You open the door, step over a low threshold, sit on a built-in seat, close the door, and fill the tub around you. When you are done you stay seated while it drains, then open the door and step out. Options include air or water jets, a heated seat, an in-line heater that keeps the water warm, and a fast-drain system.

Walk-in shower

A shower with a low curb, often a few inches high, that replaces a tub. You step over the small curb and shower standing or on a fold-down seat, with grab bars and a hand shower. It is the simplest and often the least costly conversion.

Roll-in shower

A shower with no curb, or a very low collapsible water dam, designed so a shower wheelchair can roll straight in. It needs a larger floor area and a floor that slopes to the drain. For a full-time wheelchair user, this is usually the right choice.

Side-by-side comparison

Who a walk-in tub tends to suit

• People who love a bath and would bathe more often if getting in were safe.
• People with arthritis, stiffness or chronic aches who find warm water helps them move.
• People who feel unsteady standing in a shower but can walk a few steps and sit.
• People who bathe independently and want privacy, with grab bars and the door close by.

The trade-off is time. You get in before the water goes in and you get out after the water drains. For most people that is a few extra minutes on each end. For someone who gets cold easily, a heated seat or a fast drain helps. For someone with significant cognitive decline, the sequence of steps may become confusing, and a shower may be simpler to supervise.

Who a walk-in shower tends to suit

• People who already prefer showers and can step over a small curb.
• Couples where one partner needs grab bars and a seat but the other still showers standing.
• Homes where the water heater is small or the budget is tight.
• People who want a quick routine with no waiting.

Who a roll-in shower tends to suit

• Full-time wheelchair users and people who use a shower commode chair.
• People whose mobility is expected to decline, for example with certain progressive conditions, where planning once is better than remodeling twice.
• Households where a caregiver helps with bathing every day and needs room to stand beside the person.

Think about the next five years, not only today

A bathroom change is a once-in-a-decade project for most families. If a parent walks with a cane today but has a condition that often progresses, it may make sense to plan for a roll-in shower now. If the person is active and simply wants to avoid the high tub wall, a walk-in tub can serve well for many years. A physical or occupational therapist can be very helpful here. Many will assess how someone transfers and suggest the right setup; ask the person's doctor for a referral.

Space and layout questions to answer

Before choosing, measure the space and look at the door into the bathroom. Our measuring guide has a step-by-step checklist. A few quick checks:

• Is the current tub in a 60-inch alcove with walls on three sides? Many walk-in tubs and showers are made for that space.
• Is there clear floor space in front of the tub for a walker, a wheelchair, or an outward-swinging tub door?
• How wide is the bathroom doorway? Narrow doors in older homes can limit wheelchair access no matter what you install.
• Is there another full bathroom in the home with a tub?

California rules that affect a shower conversion

• Showerhead flow. California's appliance efficiency standards (Title 20) limit new showerheads, including hand-held ones, to 1.8 gallons per minute. A new walk-in or roll-in shower will use compliant fittings.
• The fixture replacement rule. A tub-to-shower conversion usually needs a permit. Under California Civil Code section 1101.4, a permitted alteration to a single-family home triggers replacement of older high-flow toilets, showerheads and faucets before final approval, so an original toilet in the same bathroom may need replacing.
• Scald protection. Shower valves must meet California Plumbing Code standards for temperature control, and tub fillers are capped at 120 degrees Fahrenheit.
• Licensing. A conversion is far above California's $1,000 minor-work limit, so the person doing it should hold a CSLB license. See our contractor guide.

Funding can point toward one option

If you are a veteran, note that the VA's HISA benefit specifically lists roll-in and walk-in showers as examples of eligible work, while its published exclusions include spa, hot tub and Jacuzzi-type tubs. Whether a particular walk-in tub qualifies is a decision for your local VA Prosthetic and Sensory Aids Service, so ask before you buy. Our paying for it guide explains HISA and other options.

A simple way to decide

1. Watch a normal bath or shower day. Where is the hardest moment: stepping over, sitting down, standing up, or turning?
2. Ask the person what they want. Some people strongly prefer baths, and they will use the bathroom more if it feels like their own choice.
3. Measure. The room may rule an option in or out quickly.
4. Talk to a specialist. Describe the person and the room. A good specialist will tell you when a shower is the better fit, even if you called about a tub.