Airbnb & Short-Term Rental Rules in San Francisco (2026 Guide)

InvestingBy the Home Nexio Editorial Team2 min read

Quick Answer

San Francisco requires short-term rental hosts to register with the city, live in the unit as their permanent residence, and caps unhosted (host-away) rentals at 90 days per calendar year. Hosted rentals, where the host is present, don't face the same night cap.

San Francisco's short-term rental framework follows a similar pattern to other major California cities: registration, a primary residence requirement, and a cap on unhosted rentals. For investors, the primary residence rule is the headline constraint to understand before planning a strategy here.

Registration and Primary Residence

To legally operate a short-term rental, hosts must register with the city and demonstrate the unit is their permanent residence — generally defined as living there for the majority of the year. This single requirement is why San Francisco isn't a market for buying a separate, dedicated short-term rental investment property.

The 90-Day Unhosted Cap

Unhosted rentals — where the host is traveling and the full unit is rented out — are capped at 90 nights per calendar year. Hosted stays, where the host remains on the property, are generally not subject to the same cap. This structure incentivizes the "rent a room while I'm home" model over the "whole place while I'm away" model for the majority of the year.

Business Registration Requirement

Hosting is generally treated as a business activity in San Francisco, meaning hosts are typically expected to register for a business account with the city and remit applicable local taxes on rental income, separate from the short-term rental registration itself.

Added Complications for Renters

If you're renting (not owning) and considering subletting your unit as a short-term rental, be aware this can violate your lease terms independent of what city short-term rental law technically permits — and if the unit is rent-controlled, the stakes of a lease violation are higher given San Francisco's strong tenant protections.

What This Means for Investors

San Francisco's framework is built around resident hosts supplementing their income, not investors operating dedicated short-term rental businesses. Investors specifically targeting the STR model typically look to nearby markets with more permissive rules rather than trying to force the strategy into San Francisco's residency-based system.

Rules change. Confirm current requirements with the San Francisco Office of Short-Term Rentals before listing, since enforcement priorities and specific thresholds can shift.

Frequently Asked Questions

Can I short-term rent an investment property I don't live in, in San Francisco?

Generally no -- the registration requirement ties legal short-term rental status to the host's permanent residence, ruling out the dedicated non-owner-occupied investment model in most cases.

What's the 90-day cap exactly?

It applies to unhosted rentals -- stays where the host isn't present. Once a unit hits 90 unhosted nights in a calendar year, it must stop unhosted rentals for the remainder of the year, though hosted stays (host present) aren't subject to the same limit.

Do I need a business registration in addition to the short-term rental registration?

Typically yes -- hosts are generally expected to register as a business with the city in addition to the short-term rental-specific registration, since hosting is treated as a business activity subject to applicable local business taxes.

What if my building is a rent-controlled unit?

Subletting a rent-controlled unit as a short-term rental raises additional legal complications beyond the short-term rental ordinance itself, including potential lease violations -- check both your lease terms and rent control rules before attempting this.

Are there HOA or building restrictions beyond city law?

Often yes. Many condo and co-op buildings in San Francisco separately prohibit or restrict short-term rentals through their own governing documents, regardless of what city registration allows.