When designing an ADU, plan ahead and think about how you or a family member will be able navigate their home when they are older and have mobility issues. People have already thought a lot about this and have developed some great accessible designs.
The single floor plans are a nice start for aging in place, however, if families do not design ADU’s to work for them as they age or unexpected life changes, the investment will create more barriers for them and for future residents, especially to be safe in bathrooms. Many of the floor plan examples will be a challenge for families to navigate if they need to use a walker/rollator in the future.
Designing ADUs with more accessible features is a challenge in small spaces, but there are resources out there to get families started including https://www.aarp.org/livable-communities/housing/design-competition-tool-kit/.
This sustainable housing challenge is also why AIA Maine just completed an AARP design competition to gather housing ideas which include some nice UD ADU examples, including the ones from UMA architecture students: https://aiamaine.org/aarp.