Do I Need a San Diego STRO License for a 30 Day Rental?

A 30-night minimum is the most common way San Diego owners try to stay outside the short-term rental rules, and it does not reliably work. The city does not count nights. It asks whether a stay ran for less than one month, and it measures that from the check-in date to the same date of the next month.

The City Treasurer states the test in one sentence, and then adds the part owners miss: a month is "the period of consecutive days from the first calendar day of occupancy in any month to the same calendar day in the next month following, or the last day of the next month following if no corresponding calendar day exists." Then: "This may or may not be 30 days."

So 30 nights is not the test, in either direction. A 28-night stay can clear the threshold and a 30-night stay can fall short of it, depending only on the date it starts.

The Short Answer: 30 Nights Is Not the Test

Sometimes yes, sometimes no, and the number 30 is not what decides it. The trigger is whether the occupancy ran for less than one month on the city's date-to-date measure.

Work it from the check-in date rather than from a night count. Find the same date in the following month. If that date does not exist, because the next month is shorter, use the last day of that month instead. Compare the result to the check-out date. That comparison is the whole test, and it is the only one the city describes.

Do not try to reduce this to a rule about which months are safe. The city's own examples, below, include a 30-night stay that IS a full month and a 30-night stay that is not, so any shortcut based on how many days a month contains will get some bookings wrong. If you plan to operate without a license, apply the date test to each booking. If you would rather not, review the San Diego STRO permit requirements.

The City's Own Definition of One Month

The Office of the City Treasurer defines short-term residential occupancy as the rental of a dwelling unit, or part of one, for less than one month. The definition of "one month" has two clauses, and both matter.

The first clause is date to date. A stay that begins on a given calendar day runs for one month when it reaches the same calendar day of the next month. A booking starting September 14 reaches one month on October 14.

The second clause is the fallback, and it is the one owners never account for. Where the next month has no corresponding date, the month ends on the last day of that month instead. A stay beginning on the 31st therefore reaches one month on the last day of the following month, whatever date that is.

The same measure decides the San Diego transient occupancy tax. A stay of less than one month is taxable and the owner must hold a transient occupancy tax certificate and remit the tax; a stay of one month or more is exempt. The licensing question and the tax question move together.

The City's Three Examples, and What They Actually Show

The City Treasurer publishes three examples. They are worth reading in the city's own terms rather than paraphrased, because the third one is the one that breaks the intuition.

Check in January 1, check out January 31. Not exempt. The stay would have had to reach February 1 to make a month, so this one falls short.

Check in February 3, check out March 3. Exempt. It is 28 nights, fewer than the first example, and it is a full month because it reaches the same date in the next month.

Check in August 31, check out September 30. Exempt. This is 30 nights, and it clears the threshold because September has no 31st, so the second clause applies and the month ends on the last day of September.

Put the first and third side by side. Both are 30-night stays. One needs a license and one does not, and the only difference is the date the guest arrived. That is why a rule of thumb based on the length of the month does not survive contact with the city's own worked examples.

What It Means to Be Under the Threshold

If a reservation falls under the one-month standard, the city regulates the property as an active short-term rental. The owner must secure an STRO license under one of the city's four licensing tiers before offering the property for rent.

There are four tiers. Which one applies depends on how the property is used and where it sits, and each carries its own annual limits and conditions. Those are set out in full in our guide to how many days a year you can rent a San Diego Airbnb; take your tier from that rather than assuming.

Licensed properties must comply with specific operational rules. The owner must display both the STRO license number and the transient occupancy tax certificate number on every listing and public advertisement. Complying with San Diego short term rental listing and notice requirements also requires posting an exterior notice visible from the public sidewalk that lists host details, license numbers, and local contact information.

A designated local contact must respond to a reported complaint, in person or by phone, within one hour, and then take action to resolve it. Those are two separate obligations. Hosts must also give every guest the San Diego Good Neighbor Policy, post a human trafficking awareness notice, keep proof of completing a trafficking awareness course, and comply with the California Fire Code. On enforcement, the city publishes no flat fine: a third alleged violation of host operating requirements at the same unit or by the same host within 12 months may go to a hearing officer, who can revoke the license.

How Atlia Handles This for Owners

Atlia manages San Diego short-term rentals end to end for a flat 10% of booking revenue, with repairs and supplies passed through at cost rather than marked up. That covers guest communication, turnover and cleaning coordination, maintenance coordination, dynamic pricing and owner reporting.

The obligation on this page that owners find hardest to cover themselves is the local contact, particularly from out of town. Atlia has a staffed base in San Diego, and covering that role inside the city's one-hour response window is included in the management rate rather than billed separately. Full details are on our San Diego short-term rental management page.

Conclusion

A 30-night minimum does not settle the question. The city measures from the check-in date to the same date of the next month, or to the last day of that month where the date does not exist, and its own examples include 30-night stays on both sides of the line. Apply the date test to each booking, or hold a license and meet the operating requirements that come with it.

If the second option is the one you would rather not run yourself, that is what Atlia does, at a flat 10% of booking revenue with no markup on repairs or supplies.