Yards and Setbacks

Yards and setbacks are the open, unbuilt strips required between a building and the lot lines. Front, side, and rear yard requirements vary by zone, by the variant within a zone (R1V, R1F, R1R), and substantially by whether the lot is in a designated Hillside Area subject to the Baseline Hillside Ordinance. The setback rule that applies to a project is determined by reading the right table, and on hillside lots the right table is rarely the base zone table.

LAMC §12.21 C.10(a) and Table 12.21 C.10-1 for hillside R1, RS, RE, RA lots, including the table-embedded plane-break rule for tall side walls. LAMC §12.08 C.5 with Tables 12.08 C.5(b), (c), and (d) for non-hillside R1 variants. LAMC §12.21 C.10(a)(7) for the Occupied Rooftop Deck Setback. LAMC §12.21 C.10(a)(8) for the basement-as-story rule applied to side and rear yard requirements.

Side and rear yard corrections citing the wrong table being used, missing plane-break offsets on tall side walls, missing additional-foot side-yard increments above 18 feet of building height, or basement habitable rooms that the design did not count as a story for setback purposes. The plane-break rule is built into Table 12.21 C.10-1 itself and may be flagged by reference to that table or to the figure on PC/STR/Corr.Lst.107A.

Defaulting to standard R1 setbacks on an R1V, R1F, or R1R lot, or applying the base zone table to a hillside lot without recognizing that the BHO table substantially overrides the base zone. Another common pattern is drawing a long, tall side elevation without the required plane break, on the assumption that the side yard alone satisfies the setback rule.

Setback rules may shape the building’s footprint more than any other layer. On hillside R1 lots specifically, where a side wall exceeds 14 feet in height with a continuous length greater than 45 feet, the code requires a plane-break offset of at least 5 feet beyond the required yard for at least 10 feet, which typically forces a step in the wall plane. Above 18 feet of building height, an additional foot of side yard could be required for each 10-foot increment of additional height. A basement with habitable rooms typically counts as a story for setback purposes, which may push the rear yard requirement upward.

Encroachment Plane (because upper-floor side setback geometry typically interacts with the encroachment plane), Maximum Envelope Height under the BHO (because building height interacts with the side-yard step above 18 feet), Slope Band Analysis (because the same hillside framework governs RFA), and Substandard Hillside Limited Street (where setback rules may be further reduced through Zoning Administrator approval under §12.24 X.28).

Verification: §12.21 C.10(a) and Table 12.21 C.10-1 confirmed at LAMC line 14919. The plane-break rule (5-foot offset, 10-foot length, side walls exceeding 14 ft height and 45 ft continuous length) is part of Table 12.21 C.10-1 itself, confirmed at LAMC line 14990. The 18-foot height trigger for the additional side-yard increment confirmed at LAMC line 14986. §12.21 C.10(a)(7) Occupied Rooftop Deck Setback confirmed at LAMC line 15077. §12.21 C.10(a)(8) basement-as-story rule confirmed at LAMC line 15081.