A117.1 Chapter 6
Chapter 6 of A117.1 covers the fixtures GCHS estimators run into on nearly every accessibility modification: water closets, lavatories, and the bathing fixtures covered in the next lesson. This lesson works through Section 603, the general rules for toilet and bathing rooms as a whole, Section 604, water closets, and Section 606, lavatories. A recurring theme in this chapter is that the same fixture can have more than one governing number depending on which unit type it sits in; this lesson gives the general Chapter 6 numbers and flags the one place, water closet seat height, where Type A units get their own, separate figure covered fully in Lessons 9 and 10.
Section 603.2.1 requires a turning space inside the toilet or bathing room, sized to Section 304's turning-space rules. The important detail for a GCHS floor plan review is where that space has to be: in the room itself, not tucked inside a separate toilet compartment. A bathroom laid out so the only clear turning area sits behind a partition, in a stall a wheelchair user cannot enter and turn around in, does not satisfy 603.2.1, even if the compartment itself is roomy. When GCHS reviews an existing bathroom for a rehab scope, checking where the turning space actually lands, not just whether one exists somewhere in the room, is the first thing to verify.
Section 603.3 sets the mounting height for a mirror installed above a lavatory: the bottom edge of the reflecting surface must be 40 inches maximum above the floor. A mirror hung at a standard countertop-plus-backsplash height for a standing user often lands well above that line, cutting a seated user out of their own reflection entirely. This is a low-cost item to catch at design review, since it is usually just a mounting-height change rather than a different fixture.
Section 604 sets the general water closet requirements that most GCHS bathroom retrofits are measured against. The fixture's centerline must fall 16 to 18 inches from the side wall (604.2), and the clearance around the water closet must be at least 60 inches wide, measured from the side wall, by 56 inches deep, measured from the rear wall (604.3). A water closet set dead-center in a narrow closet-sized room, or crowded against a vanity that eats into the 60-by-56 envelope, fails this section regardless of how new or well-finished the fixture itself is.
Section 604.4 sets the general seat height for a water closet at 17 to 19 inches above the floor. This is the number Accessible units use, by way of Section 1102.11.2 pointing back to this general Chapter 6 figure. Type A units, however, do not use this section at all for seat height. They have their own provision, Section 1103.11.2.4.5, which sets a 15-to-19-inch range, 2 inches lower at the minimum than the general 604.4 figure. That means a water closet installed at exactly 17 inches satisfies both an Accessible unit and a Type A unit, but one installed at 15 or 16 inches satisfies a Type A unit only, not an Accessible unit. Lessons 9 and 10 cover this distinction in full as part of each unit type's complete requirements; the point to hold onto here is that "the ADA height toilet" is not one universal number in A117.1, and GCHS specs should cite the section that actually applies to the unit type on that job.
Grab bars at the water closet are required on both the side wall and the rear wall, sized differently for each. The side-wall grab bar must run horizontally with a minimum length of 42 inches, plus a vertical grab bar with a minimum length of 18 inches. The rear-wall grab bar needs a minimum length of 36 inches, though where a recessed fixture next to the water closet leaves too little wall space for 36 inches, the bar may instead be 24 inches minimum and centered on the water closet. Getting the side-wall bar's full 42-inch run in place, not just a shorter bar that looks close enough, is one of the most common grab bar installation errors GCHS inspectors flag on punch lists.
Section 606 governs lavatories, the accessible sinks in a toilet or bathing room. The clear floor space in front of a lavatory must be at least 30 inches wide, with a depth of 52 inches in new buildings or 48 inches in existing buildings (Section 305.3), positioned for a forward approach. That space has to be positioned for someone to roll straight up to the lavatory, not just alongside it, since a side-only approach to a sink does not give the knee and toe clearance underneath it any function.
The lavatory rim or counter surface must be no higher than 34 inches above the floor, giving a seated user a surface they can actually reach across. Underneath that rim, Section 606.2 requires knee and toe space that follows Section 306's clearance figures, the same knee and toe dimensions covered in Lesson 2. A lavatory installed in a cabinet with a solid apron below the rim, instead of open knee space, blocks the forward approach even if the rim height itself is correct.
A lavatory faucet is an operable part, and Section 606.4 sends it to Section 309's general rule, which applies to it the same way it applies to any other control covered in Lesson 2: it must be operable with one hand, must not require tight grasping, pinching, or twisting of the wrist to operate, and must not need more than 5 pounds of force. A round knob faucet that has to be gripped and twisted does not meet 309, regardless of how the rest of the lavatory is installed; a lever or push-type handle generally does.
Mirror above lavatory: 40 in. max to bottom edge (603.3). Water closet centerline: 16-18 in. from side wall (604.2). Water closet clearance: 60 in. wide x 56 in. deep (604.3). Water closet seat height: 17-19 in. general Ch.6 figure used by Accessible units via 1102.11.2 (604.4); Type A units use their own 15-19 in. range under 1103.11.2.4.5 instead. Water closet grab bars: side wall 42 in. min horizontal + 18 in. min vertical, rear wall 36 in. min (24 in. min if constrained) (604.5). Lavatory clear floor space: 30 in. wide x 52 in. deep (new) or 48 in. deep (existing), forward approach (606.2, 305.3). Lavatory rim: 34 in. max above floor (606.3). Faucet: one-hand operable, no tight grasp, 5 lb max force (606.4, 309.4).
Why this matters for GCHS
GCHS estimates and inspects bathroom modifications; the actual plumbing and carpentry is done by contractors GCHS oversees, not by GCHS crews directly. That makes these clearance and mounting-height numbers the exact things a GCHS estimator has to catch on a site walk and specify correctly in the scope of work, and the exact things a GCHS inspector checks before sign-off, since a contractor who installs a water closet at the wrong centerline or a grab bar six inches short creates rework the homeowner cannot afford to absorb.
1. Under Section 603.2.1, where must the required turning space in a toilet or bathing room be located?
2. Under Section 603.3, what is the maximum height for the bottom edge of a mirror mounted above a lavatory?
3. Under Section 604.2, how far from the side wall must a water closet's centerline be located?
4. What is the minimum clearance required around a water closet under Section 604.3?
5. Under the general Section 604.4, what is the water closet seat height range, and which unit type uses this figure?
6. A GCHS crew installs a water closet at 15.5 inches seat height in a Type A dwelling unit bathroom. Does this comply?
7. Under Section 604.5, what is the minimum length for the horizontal portion of the side-wall grab bar at a water closet?
8. What is the minimum length of the rear-wall grab bar at a water closet, and what shorter length is allowed where a recessed fixture beside the water closet limits the wall space?
9. A GCHS inspector finds a side-wall grab bar installed at only 30 inches long. Is this acceptable under Section 604.5?
10. Under Section 606.2 and Section 305.3, what clear floor space must be provided in front of a lavatory for a forward approach?
11. What is the maximum height above the floor for a lavatory rim or counter surface under Section 606.3?
12. On a GCHS bathroom retrofit, the lavatory is installed with a solid cabinet apron below the rim instead of open knee space. What does this violate?
13. Under Section 309.4, what force limit applies to operating a lavatory faucet?
14. A GCHS-specified lavatory faucet has a round knob that must be gripped and twisted to turn on. Does this meet Section 309?