Except for the structures and exceptions specified in this section, every part of a yard required under this title shall be open and unobstructed to the sky from the ground up.
A structure, not including a building no part of which is more than four feet (4 ft.) above the grade at any point, may occupy any yard required under the provisions of this title. Any railing required by the D.C. Construction Code, Title 12 DCMR, shall not be calculated in the measurement of this height.
A fence or retaining wall constructed in accordance with the D.C. Construction Code may occupy any yard required under the provisions of this title.
Stairs leading to the ground from a door located on the story in which the principal entrance of a building is located may occupy any yard required under provisions of this title. The stairs shall include any railing required by the provisions of the D.C. Construction Code.
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D.C. Mun. Regs. tit. 11, r. 11-2503