No room other than a habitable room shall be used for living or sleeping, or, in a dwelling unit, for the preparation of meals or for eating, except as provided otherwise in this section.
Each habitable room shall conform to the requirements of this subtitle.
A room that is used only for the preparation of meals which is not daylighted as required by Chapter 6 (but which otherwise meets the requirements of this subtitle) may continue to be used for the preparation of meals; provided, that the floor area of that room shall not be included in calculating the total habitable area of the dwelling unit of which it is a part.
D.C. Mun. Regs. tit. 14, r. 14-403