How to Set a Toilet for the Way the Person Transfers

Why this matters

A toilet is where falls at home happen most predictably, because every use is two transfers made at the moment a person is least steady. A "comfort height" bowl and two grab bars from the box can be exactly wrong: the bars on the side the person cannot grip with, the bowl too close to the wall for their shoulders, the seat two inches below their wheelchair so every transfer is a drop. The reference dimensions are a starting point. The person's transfer method decides the layout, and you only learn it by watching.

The reference, in brief

The 2010 ADA Standards use these for a water closet (604), and they are the best dimensional reference available for a private home, not a requirement there. See related: What the ADA Does and Does Not Cover in a Private Home.

• Centerline 16 in to 18 in from the side wall (604.2).
• Seat height 17 in to 19 in above the floor, measured to the top of the seat (604.4).
• Clear floor space 60 in measured from the side wall and 56 in from the rear wall (604.3).
• Side-wall grab bar 42 in long minimum, starting no more than 12 in from the rear wall and reaching at least 54 in from it; rear-wall bar 36 in long minimum, extending at least 12 in from the centerline toward the side wall and 24 in toward the open side (604.5).
• Bar height 33 in to 36 in to the top of the gripping surface (609.4), with 1 1/2 in between bar and wall (609.3).
• Flush control on the open side (604.6); paper dispenser 7 in to 9 in in front of the bowl to its centerline, outlet 15 in to 48 in high, never behind a grab bar (604.7).

The procedure

1. Watch the person transfer in the bathroom they use now, with the occupational therapist if one is involved. The transfer method is the input every other step depends on. The common ones: a stand-pivot (stands, turns, sits), a lateral or sliding transfer from a wheelchair (with or without a transfer board), a front approach (faces the toilet, turns while standing), a caregiver-assisted transfer, and a mechanical lift with a sling. If you skip this, you build the reference layout, which assumes a lateral transfer from a chair parked beside the bowl, for a person who may stand-pivot and needs something to push up from in front. See related: The Accessibility Walkthrough With the Person Who Lives There; Working With the Occupational Therapist.

2. Find the strong side and the transfer direction. After a stroke, people are usually taught to transfer toward their stronger side. The side-wall bar must sit under the strong hand once seated. The reference drawings show one hand of the layout; the mirror image is equally valid, and the person decides which. Skip this and the bar the person needs is on the wall their weak arm faces.

3. Measure the person's chair and body, not just the room. For a lateral transfer, measure the top of the wheelchair cushion, compressed, from the floor. A transfer is easiest when the two surfaces are level or the target is slightly lower. For a stand-pivot, watch where the person's hips sit relative to their knees when they rise easily from a chair they already use; a seat high enough that the hips start above the knees cuts the effort of standing. Skipping this is how a family buys a chair-height bowl that is still two inches below the wheelchair.

4. Set the centerline from the side wall. The 16 in to 18 in range exists for two reasons: close enough that the side bar is within reach of a seated person, far enough that their shoulder clears the wall. Most residential toilets sit 15 in from the side wall, the minimum the residential code allows (IRC R307.1 as adopted). Moving the bowl is a drain move. An offset closet flange shifts it a short distance; beyond that the closet bend moves under the floor. Skip it and the person transfers with a shoulder jammed against the wall, or cannot reach the bar.

5. Confirm the clear floor space for the actual chair position. The reference 60 in by 56 in is there so a chair can park beside the bowl and a caregiver can stand. In a home, measure where this person's chair will actually sit and whether a vanity, tub edge or door swing intrudes. A transfer that works in an empty room fails the first time a door is closed behind the chair.

6. Choose the seat height from steps 1 and 3. Achieve it through the bowl itself, a bolt-down raised seat, or a wall-hung bowl on a carrier, which can be set to any height in range. Measure the actual bowl rim and the actual seat, since seats differ in thickness. A loose clamp-on riser that shifts under a sliding transfer is a fall; anything that raises the seat must bolt through the bowl's seat holes.

7. Lay out the grab bars for the transfer, then back them. For a lateral transfer, the reference layout works: side bar under the strong hand, rear bar behind. For a stand-pivot, many people push up more effectively from a vertical bar on the side wall near the front of the bowl, or a fold-down bar on the open side, which also helps someone with weakness on both sides. A fold-down bar on the open side blocks a chair parked there, so it suits a person who walks to the toilet. Every bar is only as good as what it is fastened to; the structural rule and the load figure belong to See related: Grab Bar Backing and Load: The Structural Rule, and the installation steps to the Handyman pack's Grab Bar and Handrail Installation SOP.

8. Put the flush and paper where the strong hand is. The reference puts the flush on the open side so a person does not reach across their body. The paper dispenser goes 7 in to 9 in in front of the bowl, never behind a bar, and at least 1 1/2 in below a bar or 12 in above it (609.3), so the hand gripping the bar is not also fighting the dispenser.

9. Trial the height and position before anything is set. Never have a person transfer onto a dry-fit bowl; an unsecured bowl rocks or slides under a transfer. Use a bedside commode with adjustable legs, set to the planned seat height at the planned centerline, with the OT or caregiver spotting, and have the person transfer on and off at least twice. Skip this and the first real test is a finished, tiled install.

10. Set the toilet and return it to service. Covered under the worked example, because the return to service carries its own checks.

The worked example

A 74-year-old man has left-side weakness after a stroke. He uses a manual wheelchair whose compressed cushion measures 19 1/2 in from the floor, and he does a sitting slide transfer toward his right side, his stronger one, with his wife standing by. The existing toilet sits 15 in from the side wall, which happens to be on the correct side: seated, the wall is on his right. The seat top measures 15 3/4 in. The house has a crawlspace.

 PLAN, rear wall at top, side wall at left
 +-----------------------------------------------
 |      12 in    24 in
 |    |<--->|<--------->|  rear bar, 36 in long
 |    ======|============
 ||         |
 ||  side  (bowl)        [ chair parks here,  ]
 ||  bar   centerline    [ beside the bowl;   ]
 ||  42 in 18 in from    [ he slides toward   ]
 ||        side wall     [ his right, onto it ]
 ||
 ||  side bar from 12 in to 54 in off rear wall
 |
 | clear floor: 60 in from side wall, 56 in from rear

• Centerline: 15 in to 18 in is a 3 in move. From the crawlspace, the plumber moves the closet bend within the same joist bay without cutting a joist. The 18 in end of the range is chosen because he is broad-shouldered and his right hand reached the side wall comfortably at that distance in the commode trial.
• Seat height: his cushion is 19 1/2 in, and the reference tops out at 19 in. The OT asked for 19 in, half an inch below the cushion, so the slide runs slightly downhill. The chosen bowl measured 17 in to the rim; a 2 in bolt-down raised seat makes 17 + 2 = 19 in.
• Grab bars: side bar 42 in long, from 12 in to 54 in off the rear wall (12 + 42 = 54, the reference minimum), top at 34 in. Rear bar 36 in long, 12 in toward the side wall from the centerline and 24 in toward the open side, so it runs from 6 in (18 minus 12) to 42 in (18 plus 24) off the side wall.
• Paper dispenser: under the side bar. With the bar's top at 34 in and a 1 1/2 in bar diameter, its underside is at 32 1/2 in, so the dispenser's top must be at or below 31 in (32 1/2 minus 1 1/2). Outlet at 26 in, 8 in in front of the bowl.
• Trial: a commode set to 19 in at the 18 in centerline; he transfers on and off twice with the OT spotting. Both work.

The hazards in this job, step by step. Shut the supply stop, flush, and sponge the bowl and tank dry before lifting; a toilet is heavy and awkward, so two people lift it by the bowl, never the tank. Stuff the open flange with a test plug or a rag tied to a string the moment the bowl is off, which keeps sewer gas, mostly hydrogen sulfide and methane, out of the room while the drain is open. The old sheet vinyl dates from the 1970s, so it is sampled for asbestos before any cut, and nobody scrapes or breaks it until the result is back. In the crawlspace, the plumber checks for wiring at the bend and wears a respirator if the space shows mold or rodent droppings, under the shop's 29 CFR 1910.134 program.

Return to service. Set the bowl on a new seal and tighten the closet bolts evenly, alternating sides until the bowl stops moving; overtightening cracks the base. Open the supply stop slowly with your eyes on the supply connection, let the tank fill, then flush five times and check the base and the supply nut with a dry paper towel after each. Rock the bowl by hand; it must not move. Then pull-test each grab bar per the load card before the man transfers, and his first real transfer happens with his wife and the tech standing by.

What changes the answer

• A stand-pivot user usually wants the higher end of the seat range or above it, a bar to push up from in front of the hip, and floor space in front of the bowl for the feet, not beside it for a chair.
• A caregiver-assisted transfer needs room on both sides of the bowl, so the side wall that helps an independent user can trap the caregiver. The OT may ask for a freestanding toilet frame or fold-down bars on both sides instead of a wall bar.
• A mechanical lift needs clearance under and around the bowl for the lift's legs, and the seat height matters less than the lift's reach.
• A progressive condition can mean today's stand-pivot is next year's lift transfer. Put backing in every wall where a bar might go, even if only one bar is installed now. See related: Designing for a Progressive Condition.

How to verify

Measure the finished install against the plan: centerline from the side wall at the front and back of the bowl, seat height at the front edge of the seat, each bar's top at both ends and its distance from the rear wall. Record them on the job. Then watch the person transfer on and off at the end of the day, when they are tired, because that is when a layout's margins disappear. If the transfer works fresh and fails tired, the seat height or bar position is at the edge of what works for them.

References

• U.S. Department of Justice, 2010 ADA Standards for Accessible Design, sections 604 and 609 (dimensional reference, not a requirement in a private home)
• International Residential Code, 2021 edition, R307.1 (fixture clearances), as adopted by your jurisdiction
• 29 CFR 1910.134 (respiratory protection)
• See related: Grab Bar Backing and Load: The Structural Rule; Grab Bar and Handrail Installation (Handyman SOP)
• See related: Working With the Occupational Therapist; Bathroom Layout for a Wheelchair User