37 Tex. Admin. Code § 261.232
Single cells, multiple occupancy cells, and dormitories may be provided with day rooms. Day rooms shall be designed for no more than 24 inmates. Based on the design capacity of the cells served, the day rooms shall contain not less than 40 square feet of floor space for the first inmate plus 18 square feet of floor space for each additional inmate; adequate toilets, lavatories, mirrors, showers, seating, and tables. A utility sink should be provided. Day rooms may be contiguous with inmate living areas provided that space requirements for living areas and day rooms are met. Convenient electrical receptacles circuited with ground fault protection should be provided. Power to receptacles should be individually controlled outside of the cell.
37 Tex. Admin. Code § 261.232