24 CFR Part 100—Fair Housing Accessibility Guidelines, Preamble

(a) Single-story dwelling units.

For single-story dwelling units, the final Guidelines specify the same design specifications as presented in the proposed Option One guidelines, except that design features within the single-story dwelling unit, such as a loft or a sunken living room, are exempt from the access specifications, subject to certain requirements. Lofts are exempt provided that all other space within the unit is on an accessible route. Sunken or raised functional areas, such as a sunken living room, are also exempt from access specifications, provided that such areas do not interrupt the accessible route through the remainder of the unit. However, split-level entries or areas will need ramps or other means of providing an accessible route.