Stepper Homes has a wheelchair accessible floorplan if you decide to go from scratch.
http://www.stepperhomes.com/building...e-housing.html
More info:
http://www2.canada.com/calgaryherald...1-4a685a026276
Also there should be people who can help advise you and your mom at the local health care stores (Motion Specialties, Medichair, Co-op Home Health Care, etc.) . Good luck.