Source:   U.S. Census Bureau, American Community Survey 2011-2015, and American Housing Survey 2011.  www.census.gov/programs-surveys/acs/   www.census.gov/programs-surveys/ahs.html

Source:

U.S. Census Bureau,
American Community Survey 2011-2015,
and American Housing Survey 2011.
www.census.gov/programs-surveys/acs/
www.census.gov/programs-surveys/ahs.html

See this wonderful video on what an accessible home looks like.
Credit of the AARP.
 
See how a well designed home with features of accessibility is warm, comfortable, and inviting for all.
Credit of the AARP.