Single Room Occupancy (SRO) housing is housing with single room dwelling units which are the occupants’ primary residences. HUD requires new construction, reconstruction of SRO units, and the conversion of non-residential space to contain either food preparation areas or bathrooms (or both). If a property is an acquisition or rehabilitation, neither of these (food preparation nor sanitary facilities) is required within each unit. However, the building itself must have shared sanitary facilities.
Source: Single Room Occupancy (SRO) Housing Definition