41 C.F.R. § 301-11.13 How does sharing a room with another person affect my per diem reimbursement?
Title 41 - Public Contracts and Property Management
Your reimbursement is limited to one-half of the double occupancy rate if the person sharing the room is another Government employee on official travel. If the person sharing the room is not a Government employee on official travel, your reimbursement is limited to the single occupancy rate.
Title 41: Public Contracts and Property Management
PART 301–11—PER DIEM EXPENSES
Subpart A—General Rules
§ 301-11.13 How does sharing a room with another person affect my per diem reimbursement?