Rancho Cucamonga limits lot coverage by all structures to 40 percent in most residential zones. Impervious surface coverage is separately regulated under MS4 stormwater permit requirements.
Lot coverage in Rancho Cucamonga is regulated by Development Code Title 17, which caps the total footprint of all buildings and covered structures at a percentage of the parcel area depending on zoning district. Low (L) and Low-Medium (LM) residential districts typically allow up to 40 percent lot coverage by primary and accessory structures, while Very Low (VL) and equestrian overlay zones cap coverage at 25 to 30 percent to preserve open space. Medium and higher density districts permit up to 50 percent coverage. Impervious surfaces including driveways, patios, pool decks, and hardscape are separately regulated under the San Bernardino County MS4 stormwater permit, which encourages permeable paving and landscaping to support infiltration. Floor area ratio (FAR) may also apply in commercial and mixed-use zones, controlling total building mass relative to lot size. Homeowners considering significant additions, ADUs, or pool houses should calculate both lot coverage and impervious surface totals before submitting plans to the Planning Department.
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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