If you are thinking of adapting your home for wheelchair use it will help to know what space you will need to allow for turning and propelling in your chair. This guide can help for wet room planning, porchways......kitchens and allowing for hallway space ....
For the non-metric countries 60" x 60" is within US ADA specs. 48" is acceptable for a turn on the landing of a ramp. 60" is required for a door entry where the door swings toward the user.