37 Tex. Admin. Code § 261.136
All single cells, multiple occupancy cells, and dormitories shall be provided with day rooms. Separation cells, violent cells, holding cells, detoxification cells, and medical cells are exempt from this requirement. Day rooms shall be designed for no more than 24 inmates, except direct supervision day rooms may be designed for up to 48 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 § 261.136