24 CFR Part 100—Fair Housing Accessibility Guidelines

(2) In single-story dwelling units, changes in level within the dwelling unit with heights between 1/4 inch and 1/2 inch are beveled with a slope no greater than 1:2. Except for design features, such as a loft or an area on a different level within a room (e.g., a sunken living room), changes in level greater than 1/2 inch are ramped or have other means of access. Where a single story dwelling unit has special design features, all portions of the single-story unit, except the loft or the sunken or raised area, are on an accessible route; and

(a) In single-story dwelling units with lofts, all spaces other than the loft are on an accessible route.

(b) Design features such as sunken or raised functional areas do not interrupt the accessible route through the remainder of the dwelling unit.