37 Tex. Admin. Code § 260.132
All single cells, multiple occupancy cells, and dormitories shall be provided with day rooms. Separation cells, holding cells, and medical cells are exempt from this requirement. Day rooms shall be designed for no more than 48 offenders. Based on the design capacity of the cells served, the day rooms shall contain: not less than 40 square feet of clear floor space for the first offender plus 18 square feet of clear floor space for each additional offender; adequate toilets, lavatories, mirrors, showers, seating, and tables. A utility sink should be provided. Day rooms may be contiguous with offender living areas provided that space requirements for living areas and day rooms are met. Convenient electrical receptacles circuited with ground fault protection shall be provided. Power to receptacles should be individually controlled outside of the cell.
37 Tex. Admin. Code § 260.132