Rancho Cucamonga zoning districts require typical single-family setbacks of 25 feet front, 5 feet side, and 20 feet rear per Development Code Title 17. ADU setbacks default to 4 feet per state law AB 2221.
Setback standards in Rancho Cucamonga vary by zoning district under Development Code Title 17, which establishes Very Low (VL), Low (L), Low-Medium (LM), Medium (M), Medium-High (MH), and High (H) residential classifications. Typical single-family standards in the Low and Low-Medium districts require a 25-foot front yard setback, 5-foot interior side yards, 10-foot corner side yards, and a 20-foot rear yard setback, though equestrian overlay areas in Alta Loma require larger setbacks to accommodate animal-keeping. Accessory dwelling units (ADUs) benefit from state-mandated minimums under Government Code Section 65852.2 and AB 2221, which set 4-foot side and rear setbacks regardless of underlying zoning and waive setback requirements for ADUs converted from existing structures. Setback encroachments for eaves, chimneys, and bay windows are permitted up to 2 feet into required yards. Corner lot visibility triangles must remain free of obstructions over 30 inches tall within 25 feet of the curb intersection to preserve driver sightlines.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in San Bernardino County.
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