Alhambra, CA Building Setbacks & Zoning: Lot Coverage Limits (2026)

Alhambra controls how much of a lot may be built upon through its Zoning Code Section 23.04.030, with limits that vary by residential zone, as published by the Planning Division. In the Residential Medium Density (RM / R-2) zone, a maximum of 45% lot coverage is allowed, and in the Residential High Density (RH / R-3) zone, up to 55% lot coverage is permitted. In the Residential Low Density (RL / R-1) zone, the city's development standards emphasize a maximum floor area ratio (FAR) of 0.40 together with the 25-foot/2-story height limit and setbacks, rather than publishing a separate lot-coverage percentage; owners should confirm any applicable RL coverage figure directly with the Planning Division. Lot coverage in Alhambra generally counts the portion of a lot covered by structures, including principal and accessory buildings, garages, carports and roofed porches, but typically excludes unenclosed, unroofed decks, landings and balconies. A separate accessory-structure rule limits such structures to occupying no more than 40 percent of the required rear yard setback area. These are city-specific limits, distinct from Los Angeles County standards. Because coverage interacts with FAR, setbacks and height, owners planning additions or new construction should verify the combined limits for their zone with the Community Development Department before designing.