Install a shelf outside the front door. Install two peepholes in the front door to accommodate someone in a wheelchair as well as someone standing up. Install handrails, bath benches, grips, hand-held shower hoses and elevated toilet seats in the bathroom. Replace doorknobs with lever-style handles or buy lever adapters that can be clamped on round knobs. Purchase lift chairs and an adjustable bed.
Convert light switches to make the lever longer and easier to grasp.