Accommodations

So, what accommodations do you think should be standard for residential buildings, either new builds or renovations?

I know that my top two are: banisters, preferably on both sides, including exterior steps, and grab bars in the shower/bathtub. Raised toilets and two grab bars around the toilet would also be useful, but for some people the raised toilets are less comfortable.

But I want to know what other people feel are the most needful accommodations.