D.C. Mun. Regs. tit. 11, § 406
406.1 Where a court is provided in a Residence District, the court shall have the minimum dimensions set forth in the following table:
| ZONE DISTRICT AND STRUCTURE | MINIMUM WIDTH OF OPEN COURT | MINIMUM WIDTH AND AREA OF CLOSED COURT |
|---|---|---|
| R-1-A, R-1-B, R-2, R-3, R-4, R-5-A One-family dwelling | 4 in. per foot of height of court, but not less than 6 ft. | Width: 4 in. per foot of height of court, but not less than 5 ft. Area: Twice the square of the required width of court dimension based on the height of court, but not less than 350 ft.2 |
| R-1-A, R-1-B, R-2, R-3, R-4, R-5-A All other structures | 4 in. per foot of height of court, but not less than 10 ft. | Width: 4 in. per foot of height of court, but not less 15 ft. Area: Twice the square of the required width of court dimension based on the height of court, but not less than 350 ft. |
| R-5-B One-family dwelling | 4 in. per foot of height of court, but not less than 6 ft. | Width: 4 in. per foot of height of court, but not less than 15 ft. Area: Twice the square of the required width of court dimension based on the height of court, but not less than 350 ft.2 |
| R-5-B Hotel | 3 in. per foot of height of court, but not less than 10 ft. | Width: 4 in. per foot of height of court, but not less than 15 ft. Area: Twice the square of the required width of court dimension based on the height of court, but not less than 350 ft.2 |
| R-5-B All other structures | 4 in. per foot of height of court, but not less than 10 ft. | Width: 4 in. per foot of height of court, but not less than 15 ft. Area: Twice the square of the required width of court dimension based on the height of court, but not less than 350 ft.2 |
| R-5-C, R-5-D One-family dwelling | 3 in. per foot of height of court, but not less than 6 ft | Width: 4 in per foot of height of court, but not less than 15 ft. Area: Twice the square of the required width of court dimension based on the height of court, but not less than 350 ft.2 |
|---|---|---|
| R-5-C, R-5-D All other structures | 3 in. per foot of height of court, but not less than 10 ft. | Width: 4 in. per foot of height of court, but not less than 15 ft. Area: Twice the square of the required width of court dimension based on the height of court, but not less than 350 ft.2 |
| R-5-E One-family dwelling | 3 in. per foot of height of court, but not less than 6 ft. | Width: 4 in. per foot of height of court, but not less than 15 ft. Area: Twice the square of the required width of court dimension based on the height of court, but not less than 350 ft.2 |
| R-5-E Hotel | 2 1/2 in. per foot of height of court, but not less than 6 ft. | Width: 2 1/2 in. per foot of height of court, but not less than 12 ft. Area: Twice the square of the required width of court dimension based on the height of court, but not less than 250 ft.2 |
| R-5-E All other structures | 3 in. per foot of height of court, but not less than 10 ft. | Width: 4 in. per foot of court, but not less than 15 ft. Area: Twice the square of the required width of court dimension based on the height of court, but not less than 350 ft.2 |
406.2 No required opening for the admission of light and natural ventilation shall open onto a court niche where the ratio between the width of court niche and the depth of court niche is less than two to one (2/1).
406.3 No portion of a court niche shall be farther than three feet (3 ft.) from a point where the court niche is less than three feet (3 ft.) wide.
406.4 In the case of an alteration affecting the amount of light and ventilation required in an existing building in a Residence District by other municipal law or regulation, no legally required window shall be permitted to open onto a court that does not comply with the dimensions given in §
406.1.
SOURCE: § 3306 of the Zoning Regulations, effective May 12, 1958; as amended by: Final Rulemaking published at 28 DCR 4192, 4193 (September 25, 1981); Final Rulemaking published at 39 DCR 8305, 8307 (November 13, 1992); Final Rulemaking published at 47 DCR 9741 (December 8, 2000), incorporating by reference the text of Proposed Rulemaking published at 47 DCR 8335, 8369 (October 20, 2000).