S.T.
Congrats that he is coming home soon. Make sure you are working with a social worker or discharge planner. They will know what options and resources are available to make the house functional for him. Not sure if you are on Medicare or not, but look into what that provides as well. If you have a long term care policy, many have home care benefits too. You should also check into local churches or agencies that might help you with building ramps - even a high school wood shop might be able to help.
If you want, feel free to email me (give me your email and I'll email you offline) with more details. I can share with you some natural technologies that can help with balance, discomfort (even phantom leg issues), inflammation, energy and more.
Good luck, but definitely express your concerns to the social worker at the rehab center before they send him home. Best to get it all addressed before he comes home.
S.