Napa County, CA Short-Term Rentals: Occupancy Limits (2026)

Napa County has not adopted an STR occupancy schedule (no per-bedroom multiplier, no daytime-event cap, no parking-per-room formula) because Section 18.104.410 prohibits the underlying use. The threshold is binary: any commercial use of a dwelling unit for a period of less than 30 consecutive days is a violation, regardless of how many guests are inside. Long-term residential occupancy of a dwelling continues to be governed by the California Building Code occupancy standards (incorporated by Napa County under Title 15) and by health and safety occupancy ratings, which apply to the building itself rather than to a rental program. Hosts inside the incorporated cities of the county (City of Napa, St. Helena, Calistoga, Yountville, American Canyon) are subject to their own city-specific STR occupancy schedules, which typically tie maximum overnight occupancy to bedroom count plus two and impose stricter daytime-gathering caps. Those city schedules do not apply outside city limits, and a property owner cannot import a city occupancy formula to legitimize an unpermitted use in the unincorporated county.