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Interpretation ZA-006: Pergolas and Trellis Cross Member Spacing to be Excluded from Lot Occupancy

Tuesday, October 1, 2019

In order for the framing of a pergola or overhead trellis to be excluded from lot occupancy, the cross members or lattice spacing of said pergola or trellis must be spaced greater than 24 inches on-center, so as not to be treated as building area, under 11 DCMR B-312, “Rules of Measurement for Lot Occupancy”. If the distance between rafters is 24’’ or less, the structure would be considered building area, would count towards lot occupancy, and is also subject to any applicable setback requirements.