Statutes, codes, and regulations
District Of Columbia Administrative Code
Title 11 - ZONING REGULATIONS OF 2016Subtitle B - DEFINITIONS, RULES OF MEASUREMENT, AND USE CATEGORIES
Chapter 3 - GENERAL RULES OF MEASUREMENT
Rule 11-B312 - RULES OF MEASUREMENT FOR LOT OCCUPANCY

D.C. Mun. Regs. tit. 11, r. 11-B312

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Current through Register Vol. 71, No. 52, December 27, 2024
Rule 11-B312 - RULES OF MEASUREMENT FOR LOT OCCUPANCY
312.1

The building area, as defined by Subtitle B § 312.3, shall be subject to the lot occupancy standard prescribed in the development standards table for the zone in which the building is located.

312.2

Lot occupancy shall be calculated by dividing the total building area, as defined by Subtitle B § 312.3, of all buildings on a lot by the total area of the lot.

312.3

For the purposes of lot occupancy calculation, building area shall be the maximum horizontal projected area of a principal building and its accessory buildings, measured at the ground level of the buildings and measured from the exterior faces of exterior walls and from the center line of walls separating two (2) buildings.

312.4

Building area shall not include:

(a) Building components or appurtenances dedicated to the environmental sustainability of the building;
(b) Cornices and eaves;
(c) Sills, leaders, belt courses, and similar ornamental or structural features;
(d) Awnings, serving a window, porch, deck, or door;
(e) Uncovered stairs, landings, and wheelchair ramps that serve the main floor;
(f) Chimneys, smokestacks, or flues; and
(g) Uncovered porches and decks that are no more than four feet (4 ft) in height above the ground level at any point.
312.5

Any railing required by the D.C. Construction Codes Supplement, Title 12 DCMR, that is required to project into the horizontal plane shall be permitted and shall not be included in the measurement of building area.

312.6

When adding a vertical addition to an existing building, each added story must comply with the required lot occupancy limitation.

312.7

In the case of a building devoted to both residential and nonresidential uses, the percentage of lot occupancy for residential uses may be calculated on a horizontal plane located at the lowest level where residential uses begin.

D.C. Mun. Regs. tit. 11, r. 11-B312

Final Rulemaking published at 63 DCR 2447 (9/6/2016); amended by Final Rulemaking published at 63 DCR 10932 (9/6/2016); amended by Final Rulemaking published at 71 DCR1527 (2/9/2024)