At most, it would probably be a Group B and Group R-4 mixed occupancy building, but there is support for the entire sleeping and support area to be classified as Group R-4.
A Group R-4 occupancy would encompass all the functions of a group home, much like Group R-3 occupancies typically include sleeping areas, dining areas, kitchens, living areas, storage areas, and home offices. This position has support in the
Commentary:
"Where five to 16 residents live in a supervised environment and receive custodial care, such a facility is classified as Group R-4. Ninety-eight percent of households in the U.S. that identified themselves as a single-family household have less than 16 occupants. The 16-occupant limit is also consistent with the limits of an NFPA 13D sprinkler system. Thus, the limit of 16 residents was established as an appropriate limit, considering that this facility will operate similarly to a single-family home."
Even if the B.O. does not support the single Group R-4 occupancy approach, it would be a Group B and Group R-4 mix. Since the number of residents is limited to 16, the likelihood that the dining rooms, group counseling rooms, and fitness rooms will exceed 49 occupants is nonexistent--even if you include all the staff and some guests. Thus, they would not meet the criteria for an assembly occupancy group per Section 302.1.2. If the spaces are less than 750 sq. ft., they can be considered either Group B or R-4; otherwise, they would be considered Group B.