The door should remain open for a minimum of 5 seconds and then should close slowly. Should be 5' in width to accommodate two wheelchairs. Should be a slip resistant surface and a high lighting level. Direct glue down level loop high density carpeting, no pad. Windows should be operational from a sitting position.
Casement windows are easier to handle than sliding or double hung.
Closet doors should be bi-fold, accordion or sliding doors. Consider adjustable or pull-out shelving. Consider counters mounted on adjustable wall brackets, so that they may be modified for both the able-bodied and handicapped population. Use a single lever side mounted faucet set. Leave cupboard doors in front of the sink and use a removable shelf.