When remodeling a bathroom to make it wheelchair accessible, there are a few design aspects to keep in mind:
Door width & location
Make the bathroom doorway at least 36 inches wide and positioned to open into a room.
Access to Shower
Walk-in, stand-up showers are recommended with little to no curb for easy access. A mounted bench inside of the shower is ideal as well as handlebars.
Make sure the position of the toilet allows enough room for a wheelchair both directly in front and to one side of the toilet.
Leave the area directly underneath the sink open. A pedestal sink is ideal for wheelchair accessible restrooms. This will allow enough room for the wheelchair to get close to the sink without obstacles