Quick Answer: You CAN rent an ADU on Airbnb in most Bay Area cities, but with important restrictions. Under SB 897 (2022), cities cannot prohibit short-term rentals of ADUs where the property owner lives on-site (owner-occupancy). However, each Bay Area city has different STR (short-term rental) permit requirements, caps, and local laws. San Francisco allows STR of your primary or secondary unit (with $250/year permit) but caps nights; San Jose requires a Business Tax Certificate; other cities have varying rules. Detached ADUs rented short-term generate $3,000–$8,000/month vs. $2,000–$4,000 for long-term in prime Bay Area locations.
ADU Short-Term Rental Rules by Bay Area City — 2025
Helpful Resources:
| City | STR Permitted? | Key Requirement |
|---|---|---|
| San Francisco | Yes (with permit) | Owner must be primary resident, $250/year, 90-night cap (unhosted) |
| San Jose | Yes | Business Tax Certificate required; no night cap |
| Fremont | Yes | Check local HOA; city permits not required |
| Oakland | Yes (with permit) | $147/year permit, owner must occupy primary unit |
| Santa Clara | Limited | Owner-occupied only; check current ordinance |
| Berkeley | Yes (with permit) | Owner must be primary resident; registration required |
Question: Does an ADU affect my property taxes in California? Building an ADU triggers a reassessment only for the value of the new construction — not the entire property (under Proposition 13). Your existing home’s assessed value remains the same; only the ADU addition is assessed at current market value. Typical ADU property tax increase: $2,000–$5,000/year (1.1% of $180,000–$450,000 ADU value). This is a small fraction of the ADU’s rental income ($24,000–$54,000/year), making the tax impact negligible. ADUs also qualify for the California Proposition 19 inheritance provisions — heirs can receive the property with its Prop 13 assessed value intact.
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