Good design should be available to everyone - and I do mean everyone. What I spent on the wheelchair I'm in could buy a small Mercedes. It's not only unfair to me; it's unfair to someone who's indigent but has the same needs. My goal is to make all objects affordable.
The cost is minimal, but one of the things that you want in a universal design is to make the plan as open as you can... and to still have walls around bedrooms and that sort of thing, and to keep the corridors wide enough so the wheelchair can do a 360 in the corridor.