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D.C. Municipal Regulations (Last Updated: September 13, 2017) |
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Title 11. ZONING REGULATIONS OF 2016 |
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SubTilte 11-B. DEFINITIONS, RULES OF MEASUREMENT, AND USE CATEGORIES |
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Chapter 11-B3. GENERAL RULES OF MEASUREMENT |
Section 11-B312. RULES OF MEASUREMENT FOR LOT OCCUPANCY
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312.1 The main building and any accessory buildings 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 of all buildings on a lot by the total area of the lot.
312.3 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.
312.4Building 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; and
(f)Chimneys, smokestacks, or flues.
312.5Any 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.
312.6When adding a vertical addition to an existing building, each added story must comply with the required lot occupancy limitation.
312.7In 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.