There are many websites pertaining to accessible issues, universal design, home modification, and so on. The list below is a great start for your personal research in making your home more functioning for yourself, family, friends, and for future homeowners in the years to come.
 

Adaptive Environments Center

Provides easy access to information and guidance about the civil rights laws and codes that provide a bedrock of accessibility in the US.
www.adaptenv.org

The American Association of Retired Persons

www.aarp.org

Assistive Technology Solutions

www.atsolutions.org

Center for Rehabilitation Technology

www.arch.gatech.edu/crt/crthome.htm

The Center for Universal Design

The Center for Universal Design (CUD) is a national information, technical assistance, and research center that evaluates, develops, and promotes accessible and universal design in housing, commercial and public facilities, outdoor environments, and products.
www.design.ncsu.edu/cud

Concrete Change

Our goal is to make ALL homes visitable, not just “special” homes — to be at the party, meeting, and family reunion . . . not isolated. We narrow the emphasis from a long list of access features to the most essential: entering a home and fitting through the interior doors. So that widespread construction change is more likely to happen quickly.
www.concretechange.org

Independent Living Research Utilization

ILRU, founded in 1975, has a long history of providing research, education and consultation in the areas of independent living, the Americans with Disabilities Act, home and community based services and health issues for people with disabilities.
www.ilru.org

The NAHB Research Center

www.nahbrc.org

RESNA, Rehabilitation Engineering Society of North America

RESNA is the Rehabilitation Engineering and Assistive Technology Society of North America.

Our purpose is to improve the potential of people with disabilities to achieve their goals through the use of technology.

www.resna.org

The Trace Center

www.trace.wise.edu
Insulspan
 
NAHB
 
 
CAPS (Certified Living In Place Specialist)