Hi Val,
as you know i also have PLS (still walking, if you can call it walking) but have started planning for the future.
I guess i am lucky that i dont have any stairs home, just single steps front and back and a flat house.
With that in mind i have concentrated on making only one entrance "wheel chair" friendly, the back one and kept the front as is.
What I have done so far is.
Got a landing and ramp built at the back (ground sloped away from the house)
Replaced relevant inside doors with sliding doors for ease of opening etc. (some people just remove them all together)
started mods to the bathroom to make it easier to use. i.e. installed some hand rails in the shower, (more work to do to make it bigger in the future) and by the toilet.
Purchaced a lift chair to aid in getting up.
Arranged with my MND association for a loaner power chair etc for when i need it etc.
I hope i dont have to use any or all of the things i have done or planning to do for a long time but as many here say its better to be one step ahead of this than one step behind. (the lift chair is brilliant, should have had one years ago)
I hope this helps you
cheers
Peter