We put in a handicapped bathroom upstairs, with a chairlift for my husband to get up there. That is when he could use a walker. Then, we had an addition put on with a huge bathroom/shower. It has two huge closets too!
Things You Need: Closets for all the supplies...we have filled it up with diapers, tube feed supplies, BiPap Supplies, Wound Care, Hoyer Lift, Sip N Puff, ... on and on... The addition has entrances onto our patio with a small ramp, and an entrance to go to the driveway to get into the handicapped van. A raised toilet is a must, handlebars, and we got a moveable handlebar to go around the toilet that we needed for a very long time. Now my husband has a wheelchair/shower chair. We found he needed the back on the chair to support his back because the stool seat was enough anymore. The wheelchair/shower chair has a removable hole with a tray on the bottom that we line with a garbage bag and that is what he now uses instead of the toilet, although you can put the chair directly over the toilet. He prefers the tray. The shower has a removable shower head/spray (European Style) to use to shower him off. I now wash him myself as he just can't use his hands. We wheel that shower chair right in there.
Advice: Stay a step a head of this disease getting what you need before you need it! The best advice I got from our ALS Social Worker! And, stay with your architect! We had a speedy build because they know what measurements and entrance requirements you need. That was the best thing we did to get it done.
At this point, I would have to look up our measurements and I can do, but I will have to repost at another time.
God Bless!