Slide bolts used instead of dead bolt locks will aid people with limited dexterity. The bolt can be used with a closed fist or elbow. The cost for removal should be minimal, depending on the floor finish required. Interior Rooms Doors can be removed in areas not requiring privacy. An example is between the kitchen and the living room.
Cost is negligible.
Wireless and remote control environmental controls allow a person to operate controls from other locations within the dwelling. Currently there are many such devices that do not require rewiring. Modifying a switch may be required depending upon the system used. Visual-signaling smoke detectors have a light that flashes when smoke is detected. This will alert a person who is deaf or hard of hearing.