37 Tex. Admin. Code § 259.430
All single cells, multiple occupancy cells, and dormitories shall be provided with day rooms. Separation cells, violent cells, holding cells, and medical cells are exempt from this requirement. Day rooms shall accommodate no more than 48 inmates. 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 inmate plus 18 square feet of clear floor space for each additional inmate; a sufficient number of toilets, lavatories, and showers as approved by the Commission, mirrors, 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 shall be provided.
37 Tex. Admin. Code § 259.430