Aging-in-Place and Accessible Bathroom Design

An aging-in-place bathroom is one you can keep using safely as your balance, strength or mobility change, whether that is next year or in twenty years. Most of the work is cheap if it is planned during a remodel and expensive if it is added later, because it lives inside the walls and under the floor. This page covers what to build in, what Washington code does and does not require, and where help with the cost may be available.

What the code requires, and what it does not

For a private single-family house, Washington's residential code applies the accessibility chapter of the building code only to structures with four or more dwelling units, and we found no section of Washington's residential or plumbing code that requires grab bars or blocking in a house. Accessible design in your own home is a choice.

Two code points help. Washington's plumbing code says grab bars and paper dispensers are not obstructions when measuring fixture clearances, and it allows grab bars and, in accessible showers, fold-down seats inside the minimum shower area. The ordinary rules still apply: a shower valve that protects against scalding with water limited to 120°F, and the clearances on bathroom plumbing code.

The figures designers use come from the 2010 ADA Standards for Accessible Design, which govern public and commercial facilities, and from the NKBA's planning guidelines. Treat both as design references, not requirements for your home.

Shower entry: curbless or low threshold

Stepping over a tub wall or a high curb gets harder as balance changes. A curbless shower lets you walk, or roll, straight in, and works with a shower chair or walker. The ADA reference for both transfer and roll-in showers is a threshold of 1/2 inch or less. A curbless shower requires the floor to be dropped or built up so it can slope to the drain, and the plumbing code treats the floor space of the room as a wet location when a shower has no threshold. See curbless showers. JDI's planning range for adding a walk-in or curbless shower is $4,000-$10,000.

Grab bars and blocking

The most important aging-in-place step costs little: solid wood blocking, or a backing panel, behind the finished wall wherever a grab bar might go. With it, bars can be added at any time without breaking tile. The NKBA recommends reinforcing tub and shower walls at construction so bars can support 250 pounds, and the ADA Standards themselves let dwelling units omit grab bars if the walls are reinforced for them.

When you do install bars, the ADA reference figures are a sound starting point:

Bars must not rotate in their fittings. Towel bars and soap dishes are not grab bars and should not be used as one. Choosing bars and mounting is covered on grab bars and safety hardware.

Toilet height and position

A taller seat is easier to sit on and rise from. The ADA reference for an accessible toilet is 17 to 19 inches to the top of the seat, with 15 to 19 inches allowed in residential dwelling units, and a centerline 16 to 18 inches from the side wall so a grab bar on that wall is within reach. That centerline is closer to the wall than the NKBA's 18-inch recommendation for an ordinary layout, and well over Washington's 15-inch minimum, so decide early whether the toilet will sit next to a grab bar wall. Read toilets for height options, and remember any new toilet in Washington must use 1.28 gallons per flush or less.

Showering seated: handheld shower, seat and controls

• Handheld shower. The ADA reference calls for a hose at least 59 inches long that works as both a fixed and a handheld head. A slide bar lets each user set the height. In Washington, multiple shower outlets on one valve are limited to a combined 1.8 gpm unless only one runs at a time.
• Seat. The NKBA recommends a shower seat 17 to 19 inches high and 15 inches deep. A built-in bench or a fold-down seat, with blocking behind it, beats a loose shower chair.
• Controls. The NKBA recommends shower controls 38 to 48 inches above the floor, reachable from inside and outside the spray. An offset valve lets you turn on the water and test it without getting wet.
• Scald protection. Required on every shower valve; ask for the limit stop to be set and checked.

See shower valves and controls.

Hands, feet and light

• Lever handles on faucets, valves and doors are easier than knobs for stiff or weak hands.
• Slip-resistant floors. The NKBA recommends slip-resistant surfaces for bathroom floors, shower floors and tub bottoms. For level interior floors that get wet, ANSI A326.3 sets a wet DCOF of 0.42 or more; ask for it on the tile spec sheet.
• Lighting. Even light without glare, a light in the shower and a low night light along the path from the bed reduce trips. See bathroom lighting.

Doors and turning space

The NKBA recommends a door with at least 32 inches of clear opening (a 2-foot-10-inch door) for general use and 34 inches under its access standard. A pocket door or an outswinging door keeps the door out of the room, and lets someone reach a person who has fallen against it. If a wheelchair may be used, the ADA reference for turning space is a 60-inch circle or a T-shaped space within a 60-inch square. Many existing bathrooms lack that much floor, so it often means taking space from a closet or rearranging the room; see bathroom layouts.

Help with the cost, as of October 2026

These programs exist on their owners' own pages; eligibility is narrow, so check each directly.

• VA housing grants. For veterans with qualifying service-connected disabilities, the VA lists Specially Adapted Housing grants up to $126,526 and Special Housing Adaptation grants up to $25,350 for fiscal year 2026. FY 2027 amounts were not yet posted when we checked.
• VA HISA. A lifetime benefit for medically necessary home changes, including roll-in showers and lowered sinks and counters: $6,800 for a service-connected disability (or for veterans rated at least 50 percent service-connected), $2,000 otherwise. It needs a VA physician's prescription and does not pay for spas or jetted tubs.
• USDA Section 504. Loans up to $40,000 at a fixed 1 percent and, for very low income owners aged 62 or older, grants up to $10,000 to remove health and safety hazards, in eligible rural areas only. Check your address on USDA's eligibility map.
• Clark County Housing Preservation Program. For owners outside Vancouver city limits (and within Woodland city limits) with household income at or below 60 percent of area median income. Its listed projects include roll-in showers and grab bars, with up to $40,000 available as a grant. Its waitlist is currently closed; new applications are accepted only for emergency repairs.
• City of Vancouver Housing Rehabilitation Program. Inside city limits, 2 percent simple interest loans up to $35,000 for households at or below 80 percent of area median income, with no payments until the house is sold. Its listed priorities are structural, dry rot, weatherization and system deficiencies; the page does not mention accessibility, so ask before applying. It warns that waits may be 12 months or more.

For other ways to pay, see financing a bathroom remodel.

Planning an accessible bathroom with us

An aging-in-place bathroom works best when the shower, toilet, blocking and lighting are planned together. At JDI Construction, our designer plans these details into the layout and shows them in a 3D design layout before construction. Many owners start with a walk-in or curbless shower; for a whole room, start with bathroom remodeling in Vancouver, WA.