It’s the little things, though. What is your access like from the street to the front door? If you are almost immobile, can you sit in the sun in your own garden?
If you have two reception rooms downstairs, then one can be turned into a bedroom seeing as you have a bathroom downstairs already. Do you have two reception rooms? Will that bathroom take a wheelchair?
Does your toilet have the space for someone to be manhandled onto it and off again, including turning them around and into a wheelchair again? If there isn’t enough space, it’s bloody hard.
If you need carers, can they park outside your front door? I don’t think carers get paid until they are inside. (Happy to stand corrected here). Are they getting paid to walk x number of minutes up and down the street having had to search for parking?
I agree that good neighbours are a blessing but they live their own lives with their own priorities.
These days, those mobility scooter thingies are so useful in maintaining one’s independence. But can you park it, charge it and get to it?
My DM planned to live a long life but died of cancer at 64. Prior to that, we had elderly, frail relatives. A lot of lessons were learnt and I will not forget them. If you are unsure, a discussion with a geriatric occupational therapist (do you have them in the uk?) will perhaps guide your thinking.