I don't know about that many adults, but I know that Canmore has a problem with unlicensed vacation rental homes and condos. You can find information on the Town of Canmore website about the local zoning regulations, including, if I recall correctly, a listing of the addresses that are licensed to be rented.
I know that Alberta Health requires B&Bs to have no more than eight guests per home (in addition to the host family); any more than this and the building standards that are in place for a residence are not enough, and the premises fall under commercial building codes,which require a commercial fire alarms, sprinklers, more emergency exits etc.