I am considering making our roughly 300 sq ft single car attached into a bedroom and 1/2 bath. There is no current access from the garage to the house and it sits about 2 1/2 ft lower than the house. The garage appears to sit on a concrete slab which has a few small cracks on the outside. We would most likely need to raise the floor a few inches and build a new one. Any concerns with garage converts that I would need to know before considering this further? I didn't know if anyone who was well versed in building codes could enlighten me before I go to our building inspector.