Rancho Cucamonga, CA Building Setbacks & Zoning: Setback Rules (2026)

010-1A even apply: required yard areas must stay free of buildings and structures, and a yard credited to one building cannot also satisfy the setback requirement for a second building on the same lot. The setback distance itself is measured at a right angle, with front and corner side yards measured from the curb face and rear and interior side yards measured from the property line, a distinction that matters because curb-to-property-line distances vary block to block. The table numbers vary sharply by zone: the large-lot Very Low (VL) zone requires a 42-foot front setback, a 27-foot corner side setback, an interior side setback totaling 10 to 15 feet, and a 60-foot rear setback, while the Low (L) zone requires only 37 feet in front, 27 feet on the corner side, 5 to 10 feet on the interior side, and 20 feet in back.

The Low Medium (LM) zone tightens further to a 32-foot front setback, 22-foot corner side, and 15-foot rear setback. 040(E): eaves and awnings up to three feet, chimneys and bay windows up to two feet, and uncovered porches or decks under 36 inches high up to six feet into a front or corner yard. Corner lots must keep both the front and street side yards clear of encroaching buildings, and additions to an existing house may use the smaller of the base zone's setback or the existing house's setback, provided the addition does not encroach further than the house already does.