The concept of visitability has been around for over a decade. Visitability is about designing and building homes with basic features that make the main level accessible to everyone. 

Visitable Homes: How to increase uptake:

https://www.cmhc-schl.gc.ca/en/housing-observer-online/2018-housing-observer/visitable-housing-increase-uptake-canada

Why Visitable Housing Matters – Fact Sheet:

https://www.cmhc-schl.gc.ca/en/housing-observer-online/2016-housing-observer/why-visitable-housing-matters

Accessible Housing by Design – Visitability:

https://www.cmhc-schl.gc.ca/en/data-and-research/publications-and-reports/accessible-housing-by-design-visitability

Visitable homes case study:  

https://www.cmhc-schl.gc.ca/en/data-and-research/publications-and-reports/visitable-homes