The state-law baseline
California ADU law doesn't ban short-term rentals outright, but it explicitly authorizes local agencies to require that an ADU be rented for a term longer than 30 days. Most cities have taken that option, effectively prohibiting Airbnb-style short-term rental of an ADU even where short-term rental of the main house might be allowed. For Junior ADUs specifically, the 30-day-minimum rental restriction is written directly into state law itself, not left to local discretion.
Why this trips up rental-income planning
It's a common assumption that an ADU can generate rental income the same way a short-term vacation rental would — often at a much higher nightly rate than a long-term lease. In practice, most California cities treat ADUs as long-term housing stock, not short-term lodging, and their local ordinances reflect that. If your ADU rental income projections assume Airbnb-style rates, confirm your city's actual rule before finalizing your numbers — a long-term lease is the far more common legal path.
Examples from our service area
| City | Documented Rental Rule |
|---|---|
| Huntington Beach | 31-day minimum rental term for ADUs, enacted after a post-February 2021 short-term rental ban — see our Huntington Beach guide. |
| Fountain Valley | 30-day minimum rental term required by covenant — see our Fountain Valley guide. |
These are the two cities in our service area where we've directly documented a specific minimum rental term from official sources. Many other cities in our service area apply a similar 30-day-or-longer standard; always confirm the current rule for your specific city and property before assuming a particular rental structure will be allowed.
What changed with Senate Bill 346
Effective January 1, 2026, Senate Bill 346 gives California cities stronger tools to compel short-term rental platforms like Airbnb and VRBO to share listing and booking data. This is aimed at improving enforcement of existing local transient-occupancy tax and short-term rental rules generally — it doesn't create a new statewide ADU restriction on its own, but it does mean cities have more visibility into whether a specific listing (including an ADU) is actually complying with local rental-term rules.
This isn't legal advice
Short-term rental rules vary by city and change relatively often. This page describes the general statewide framework and two specific documented examples — not a complete list of every city's current ordinance. Confirm your specific city's rule with its planning department before building with a particular rental strategy in mind.
Frequently asked questions
Usually not. California law allows cities to require a 30-day-or-longer minimum rental term for ADUs, and most cities in our service area have adopted that requirement. Confirm your specific city's rule before assuming short-term rental will be allowed.
No — the 30-day minimum rental term for JADUs is written directly into California state law, not left up to individual cities. See our JADU vs. full ADU comparison for more on how the two unit types differ.
In many cities, yes — some jurisdictions allow short-term rental of one unit on the property (typically the primary home) while requiring the ADU itself to be rented long-term. This varies significantly by city, so confirm directly with your local planning department.