Adaptable housing refers to housing in which accessible features can easily be added or removed, based on the individual's needs. Accessibility or adaptability requirements are determined by the law that governs each housing unit, and two major laws are the Fair Housing Act as Amended (FHAA) and Section 504 of the 1973 Rehabilitation Act. The essential difference between these two classes of housing is that the FHAA requires adaptability while Section 504 of the Rehabilitation Act requires full accessibility.