(A) Every one-story dwelling hereafter erected in any R-2 one-family district shall have a total ground floor area of not less than 920 square feet, measured from the outside of the exterior walls, including utility rooms, but excluding cellars, basements, open porches, garages and other spaces that are not used frequently or during extended periods for living, eating or sleeping purposes, except rooms intended for the purposes which are “roughed in” and are to be completed within a reasonable time may be considered in computing the ground floor areas.
(B) Every dwelling of more than one story hereafter erected in any R-2 one-family district shall have a total floor area, measured from the outside of the exterior walls, of not less than 1,200 square feet, including utility rooms but excluding cellars, basements, open porches, garages and other spaces that are not used frequently or during extended periods for living, eating or sleeping purposes, except rooms intended for such purposes that are “roughed in” and are to be completed within a reasonable time may be considered in computing the ground floor areas.
('74 Code, Appendix A, § 6) Penalty, see § 156.999