24 CFR Part 100—Fair Housing Accessibility Guidelines

(iv) Toilets are located within bathrooms in a manner that permit a grab bar to be installed on one side of the fixture. In locations where toilets are adjacent to walls or bathtubs, the center line of the fixture is a minimum of 1'6" from the obstacle. The other (non-grab bar) side of the toilet fixture is a minimum of 1'3" from the finished surface of adjoining walls, vanities or from the edge of a lavatory. (See Figure 7(a).)

(a) Clear Floor Space for Water Closets

Fig. 7 Clear Floor Space for Adaptable Bathrooms