2010 ADA Standards for Accessible Design Pocket Guide
809.2 Accessible Routes.
Accessible routes complying with Chapter 4 shall be provided within residential dwelling units in accordance with 809.2.
EXCEPTION: Accessible routes shall not be required to or within unfinished attics or unfinished basements.
At least one accessible route shall connect all spaces and elements which are a part of the residential dwelling unit. Where only one accessible route is provided, it shall not pass through bathrooms, closets, or similar spaces.
All rooms served by an accessible route shall provide a turning space complying with 304.
EXCEPTION: Turning space shall not be required in exterior spaces 30 inches (760 mm) maximum in depth or width.