San Mateo Short Term Rental Regulation: A Guide For Airbnb Hosts

Do you own a place in San Mateo and you're weighing whether to put it on Airbnb or Vrbo? Well, the good news is that you can. San Mateo, the Peninsula city in San Mateo County between San Francisco and Palo Alto, allows short-term rentals, and it hasn't tried to ban them the way a handful of California beach towns have. What it has done, since February 2021, is build a real registration system with a fee, an annual renewal, and a set of standards that apply whether you're in a single-family home near Hillsdale or a condo off B Street downtown.

That's the trade-off worth understanding before you list anything. San Mateo isn't hostile to hosts, but it isn't hands-off either. You'll register the property, pay $250 a year, and collect a 14% occupancy tax on every booking, and if you're not living on-site, the city caps your unhosted nights at 120 a year. None of that is negotiable, and skipping it puts your registration, and eventually your ability to host at all, at risk.

So let's walk through what it takes to do this properly: what the city requires in 2026, what it costs, the tax layers stacked on top of a booking, how seriously the city enforces its own rules, and who to call when something doesn't match what you read here. Every figure below comes from San Mateo's own municipal code or the city's official pages, checked in July 2026. If you're weighing a San Mateo property against markets where the math might work out differently, run the numbers through BNBCalc first.

What are short term rental (Airbnb, VRBO) regulations in San Mateo,California?

Two layers of rules apply to a San Mateo listing, and separating them clears up most of the confusion.

The local layer is San Mateo Municipal Code Chapter 5.66, "Short Term Rentals," adopted by Ordinance No. 2021-6, effective February 1, 2021, and amended a few months later by Ordinance No. 2021-17. The chapter defines a short-term rental as renting a room or a whole dwelling unit for lodging purposes for fewer than 30 consecutive calendar days, and it says the goal is to "allow limited Short-term Rental uses while preventing the loss of housing stock" and to preserve residential character through operating standards. It's permitted "in any residence," subject to the whole chapter, and "all other Short-Term Rental uses shall be prohibited." There's no separate zoning map to check. If it's a legal dwelling unit in San Mateo, the ordinance applies to it.

The one carve-out worth knowing up front: accessory dwelling units don't qualify. Chapter 5.66's own definition of "Dwelling Unit" excludes ADUs, and separately, SMMC § 27.19.030 says outright that an ADU or junior ADU "shall not be rented for a period of less than 30 consecutive calendar days." That's not San Mateo being unusually strict, mind you. California's own ADU statute does the same thing statewide: Gov. Code § 66323(e) requires ADU rentals to run longer than 30 days, and AB 1154 extended the same floor to junior ADUs in 2025. So if your plan involved renting out a backyard unit by the weekend, that plan doesn't work here or anywhere else in the state.

Above the city sits California, and the state does surprisingly little of the actual regulating. There's no statewide STR permit and no statewide registry. Instead, Revenue & Taxation Code § 7280 simply authorizes any city or county to tax stays of 30 days or less, with no cap on the rate, which is exactly the authority San Mateo used to write Chapter 5.66 and its tax code. Our California statewide guide covers that framework in full, including the fine caps and the HOA rules that show up again later in this piece.

One more thing worth clearing up now, since the name causes real confusion: this guide covers the city of San Mateo, not San Mateo County as a whole. The unincorporated parts of the county, particularly the coastal towns like Half Moon Bay, Montara and El Granada, run through an entirely different permit process administered by the county Planning Department, with its own coastal-zone review. If your property sits outside city limits, our San Mateo County guide is the one you need instead.

Starting a Short Term Rental Business in San Mateo

Since the last section drew the line at what counts as San Mateo city property, the next question is still which of those properties qualify. Most residential real estate in the city does. Single-family homes, condos, multi-family units, and even a spare room inside a home you occupy are all eligible, as long as the unit isn't an ADU and you're not trying to run the whole thing as a hotel by another name.

There's no rent-control ordinance to navigate here either, which sets San Mateo apart from cities like New York. San Mateo has never adopted local rent stabilization, so the only tenant protections in play are the statewide AB 1482 caps on rent increases and just-cause eviction, and neither one blocks a registered short-term rental. That's one less hoop to jump through compared to markets where a rent-controlled unit is automatically off-limits.

Before you spend anything, though, do check a few things that will determine whether registration is even worth pursuing:

• Confirm you're not in the ADU carve-out. If the unit you're eyeing is a backyard cottage or converted garage permitted as an ADU or JADU, it can't be a short-term rental, full stop.
• Confirm you're inside city limits. The city's rules and the county's coastal rules are not interchangeable, and applying to the wrong agency wastes real time.
• Check your HOA or lease if you don't own outright. California law lets a homeowners association prohibit short-term rentals of 30 days or less even though it can't ban longer stays, under Civil Code § 4741(c), so a condo HOA can shut this down before the city ever gets involved.

Assuming your property clears all three, you're looking at a workable path: register with the city, pay the fee, collect the tax, and follow the operating standards covered in the next two sections.

Short Term Rental Licensing Requirement in San Mateo

Registration is where that workable path starts, and San Mateo runs it a little differently than a lot of California cities do. Rather than handling applications in-house, the city contracts the whole process out to HdL Companies, which runs the online portal at sanmateo.hdlgov.com. You'll apply there, pay there, and renew there, even though the underlying legal authority sits with the city's own Community Development Director.

The fee is $250 a year, non-refundable, due every July 1, according to the city's own Short-Term Rental Registration and Requirements page and its STR ordinance page. Here's the detail that catches people out: a registration always expires on July 1 of the same year it's granted, regardless of when you apply. Register in March and you're renewing again in a few months, not twelve. That's not a reason to wait, since you can't legally advertise until you're registered, but it is a reason to budget the renewal sooner than you'd expect.

Under SMMC § 5.66.050, the application itself asks for your name and contact information, the property address, and the name and contact details of your local contact person, plus a signed acknowledgment that you'll comply with zoning, the municipal code, business licensing, and health and safety standards. The Community Development Director approves it if you can demonstrate you'll meet the chapter's requirements, you have no unresolved health-or-safety code enforcement case from the past 12 months, and you haven't had a registration denied or revoked in that same window.

Getting turned down isn't a minor setback, either. A denial or revocation carries a 24-month waiting period before you can reapply, per SMMC § 5.66.120. Keep that in mind if your property has any open code enforcement issues; it's worth resolving them before you file rather than finding out the hard way.

Registration alone doesn't finish the job, though. San Mateo also requires a separate Business License (technically a Business Tax Certificate) under SMMC § 5.66.110, applied for through the city's own portal at sanmateobl.hdlgov.com. The tax itself is calculated on gross receipts rather than a flat fee, so the exact amount depends on what the property earns, and every application currently carries a $1.00 state-mandated disability access and education fee.

Required Documents for San Mateo Short Term Rentals

Since a business license runs alongside the STR registration rather than replacing it, it's worth gathering both sets of paperwork at the same time instead of discovering the gap after you've already paid the $250. Here's what San Mateo asks for:

• The STR registration form itself, with your name and contact information, the property address, and your local contact person's details.
• A signed compliance acknowledgment, certifying you'll follow zoning, municipal code, business licensing, and health and safety rules.
• A Business Tax Certificate application, filed separately through the Finance Department's online system.
• Your Transient Occupancy Tax registration, since operating a short-term rental automatically makes you an "operator" under the city's tax code, covered in the next section.

Once you're registered, the paperwork still doesn't end there. SMMC § 5.66.130 requires you to retain compliance records, including proof you've paid your occupancy tax, for three years after each rental period, and to produce them for the city on reasonable notice for inspection or audit. Keep a simple folder, digital or otherwise, with your booking dates, guest counts, and tax remittances. It's a lot less painful to build that habit from day one than to reconstruct three years of records after the city asks.

San Mateo Short Term Rental Taxes

Assuming you get through registration and are able to start hosting, there's still tax to deal with, and San Mateo stacks two layers into a single number that trips people up if they only read the headline rate. The city's Transient Occupancy Tax, under Chapter 3.56, is actually two separate taxes added together: a 12% general tax on the rent charged, plus a 2% special tax originally earmarked for police and fire facility improvements. Together that's the flat 14% figure confirmed on the city's own TOT page, and it applies to any stay of 30 consecutive days or less, which is the same threshold Chapter 5.66 uses to define a short-term rental in the first place.

Charge	Rate	Collected by
TOT general tax	12%	City of San Mateo
TOT special tax	2%	City of San Mateo
Combined TOT	14%	City of San Mateo
Business license tax	Gross receipts, varies	City of San Mateo
California Tourism Assessment	~0.195% of accommodations revenue	State (self-assessed)

Filing runs monthly. TOT is due on or before the last day of each month, and you'll need to display your Transient Occupancy Registration Certificate on the property once the Tax Collector issues it, per SMMC § 3.56.060. Miss the deadline and the penalties compound fast: a 10% penalty on the first delinquency, another 10% if you're still unpaid 30 days later, an additional 10% for every further 30-day period, plus 0.5% monthly interest on whatever's still outstanding, under § 3.56.080. Fraud pushes the penalty up another 25% on top of all of that.

Here's the part worth checking before your first guest arrives. Under SMMC § 5.66.100, you as the host are responsible for collecting and remitting TOT unless your booking platform has signed a voluntary collection agreement with the city. As of this reading, checking Airbnb's own California occupancy tax collection list directly, San Mateo the city doesn't appear on it, which means Airbnb isn't representing that it automatically collects and remits your 14% for you here. That's a useful contrast with neighboring San Francisco, which is on that list, so don't assume the two cities work the same way just because they're twenty minutes apart. Make sure you check your host dashboard's tax settings rather than assuming the platform has this handled, and if it doesn't, San Mateo hosts commonly enable manual custom tax collection so the 14% shows up as a separate line item on every booking.

Beyond the local layer, your rental income is ordinary taxable income to the Franchise Tax Board, and California also runs a statewide Tourism Assessment on accommodations revenue that platforms don't collect on your behalf; that one's a self-filed obligation through the state's own tourism office. Neither of those is unique to San Mateo, but they're real, and they're easy to forget once you've already budgeted for the 14%.

San Mateo wide Short Term Rental Rules

Once the tax math is settled, the rules that govern day-to-day operating are the ones that apply the same way everywhere in the city, whether you're near Central Park or out toward Sugarloaf Mountain. San Mateo doesn't zone short-term rentals differently by neighborhood; the operating standards in SMMC § 5.66.040 apply citywide.

Occupancy is capped at two people per bedroom or ten people per property, whichever is lower. Parking scales with bedroom count: one off-street space for properties with three or fewer bedrooms, two spaces for anything with four or more. Weddings, parties, corporate events and similar gatherings that could generate traffic, parking or noise complaints are prohibited outright, and hosts have to notify guests of the city's own noise, trash and parking ordinances before they even check in.

The rule that decides how much revenue you can realistically model, though, is the host-presence split. When you're physically on-site during a stay, there's no limit at all on the number of nights you can rent. When you're not, the city caps it at 120 days per calendar year, with the clock running from your registration date rather than the calendar year itself. That's a meaningful difference if your plan was to buy a second property and run it entirely unhosted; watch out for the 120-day ceiling when you're modeling annual revenue, because it changes the math on anything you're not personally living in.

You'll also need a local contact person named on your registration who's reachable 24 hours a day, seven days a week, and who responds within 60 minutes to complaints about noise, parking, trash or traffic, taking corrective action rather than just answering the phone. If that's not you, it needs to be someone who can genuinely be reached that fast, since the requirement is enforceable and shows up in the revocation grounds covered next.

Does San Mateo strictly enforce STR rules?" Is San Mateo Airbnb friendly?

That local-contact requirement is the clearest signal of how San Mateo enforces its rules in practice: through the registration itself rather than through roving inspectors, at least on paper. The city's primary lever is revocation. SMMC § 5.66.120 lets the Community Development Director pull a registration for fraud or misrepresentation on the application, fraudulent conduct during operation, violations of the municipal code, or breaches of other law, and the process requires 10 days' written notice and a hearing before it happens. You can appeal to the Community Relations Commission within 10 days of a denial or revocation, but if you lose, you're locked out for 24 months.

Beyond registration, San Mateo falls back on its general citywide penalty framework rather than a bespoke STR fine schedule. SMMC § 5.66.140 says the city will use "any and all enforcement options as provided for Title 1," which means infractions run $100 for a first conviction, $200 for a second within a year, and $500 for each additional conviction, or the city can pursue it as a misdemeanor carrying up to $1,000 and six months in jail. Separately, the Community Relations Commission can assess an administrative penalty of up to $1,000 per day, per violation for anything left uncorrected past the compliance deadline, plus recoverable inspection and legal costs. Even at that daily rate, San Mateo's own schedule sits comfortably under the state-law ceiling: California caps STR-ordinance fines that pose a genuine safety risk at $1,500, $3,000, and $5,000 for first, second and subsequent violations under Gov. Code §§ 25132(e) and 36900(d), so the city isn't pushing anywhere near the legal maximum it's allowed to.

Complaints route through the Code Enforcement Hotline at (650) 522-7150, and anything involving active noise or a disturbance in progress goes to the Police non-emergency line at (650) 522-7700. Neither department publishes a running count of active registrations or a compliance rate, and no city council staff report or press release from the last two years surfaced in this research turning up specific 2024 through 2026 enforcement numbers, so I'm not going to hand you a precise figure I can't back up. What the code itself tells you is that San Mateo built real teeth into this ordinance, revocation, escalating fines, a daily administrative penalty, and a 24-month lockout, even if the city hasn't been loud about deploying them publicly. Treat that as a moderately enforced market: not the payment-blocking regime a city like New York runs, but not a rubber stamp either.

How to Start a Short Term Rental Business in San Mateo

Given everything above, the order you tackle these steps in matters more than it might seem. Working through them out of sequence is how people pay the $250 twice or discover a blocking issue after they've already advertised.

1. Confirm eligibility first. Rule out ADUs and JADUs, confirm the property sits inside San Mateo city limits rather than the unincorporated county, and check any HOA or lease restrictions under Civil Code § 4741(c).
2. Register with the city. Apply through the HdL portal at sanmateo.hdlgov.com, submit your host and local-contact information, and pay the $250 annual fee, due again every July 1.
3. Apply for a Business Tax Certificate. File separately through the Finance Department's online system; it runs alongside your STR registration, not instead of it.
4. Register for Transient Occupancy Tax. Get your registration certificate from the Tax Collector and display it on the property.
5. Set up your operating standards. Line up off-street parking to match your bedroom count, confirm your occupancy cap, and line up a genuinely reachable 24/7 local contact person.
6. Decide whether you're hosting or not. If you won't be on-site, plan your calendar around the 120-day annual cap from the start rather than discovering it mid-year.
7. Collect and remit TOT monthly. Check your platform's tax settings, since San Mateo isn't on Airbnb's automatic-collection list as of this reading, and file by the last day of each month.
8. Keep three years of records. Booking dates, guest counts and tax remittances, ready to produce if the city asks.
9. Diarize your renewal. Registration always expires July 1, so don't forget to renew ahead of that date even if you only registered a few months earlier.

Who to contact in San Mateo about Short Term Rental Regulations and Zoning?

If you get stuck anywhere in that sequence, a handful of offices between them handle almost every question a host runs into.

Registration, eligibility and zoning

The Community Development Department, which includes the Planning Division, administers registration approvals and zoning questions.

• Address: 330 West 20th Avenue, San Mateo, CA 94403
• Main phone: (650) 522-7200; Planning Division direct line: (650) 522-7212
• Email: [email protected] (department-wide: [email protected])
• Walk-in hours: Planning, Monday through Friday, 8:00 a.m. to noon; Building, Monday through Friday, 9:00 a.m. to 11:30 a.m.
• The city's own STR ordinance page names Steven Peck as a direct STR contact: [email protected], (650) 522-7217.

Registration portal, renewals and TOT filing

HdL Companies, the city's third-party administrator, runs the day-to-day registration and tax portal.

• Address: 8839 N. Cedar Ave. #212, Fresno, CA 93720
• Phone: (650) 443-9056
• Email: [email protected]
• Portal: sanmateo.hdlgov.com

Business license

The Finance Department's Business Tax Division handles the separate Business Tax Certificate.

• Address: City Hall, 330 W. 20th Ave., San Mateo, CA 94403
• Phone: (650) 522-7113
• Email: [email protected]
• Hours: Monday through Friday, 8:00 a.m. to noon and 1:00 p.m. to 4:30 p.m.

Complaints and active disturbances

• Code Enforcement Hotline: (650) 522-7150, for STR complaints generally.
• Police non-emergency: (650) 522-7700, for noise or a disturbance happening right now.

What do Airbnb hosts in San Mateo on Reddit and Bigger Pockets think about local regulations?

Given how specific those contact details are, it's worth being just as specific about what hosts actually say, rather than guessing. Honestly, I went looking for a substantive San Mateo-city-specific thread on both Reddit and BiggerPockets and came up short. What does surface on BiggerPockets tends to talk about San Mateo County broadly rather than the city itself, describing a market with real regulatory "hoops to jump through" compared to looser Bay Area suburbs, which tracks with everything covered above: a registration fee, an annual renewal, a tax collection duty that isn't automated, and a 120-day cap the moment you're not living there.

The pattern that does come through, even without a dedicated forum thread to quote, is the Peninsula logic behind why people bother with San Mateo at all. It sits between San Francisco International Airport and the Silicon Valley job corridor, which means demand skews toward business travelers and relocating tech employees rather than pure vacationers, and that demand tends to hold up better through the year than a beach-town calendar would. If you're weighing that against what an entire unit might earn somewhere with fewer moving parts, our California markets page breaks the state's numbers down by market, which is a useful gut check before you commit to San Mateo specifically over a neighboring city.

I'd treat the absence of loud host complaints as a mild positive rather than a red flag. Cities with genuinely punishing STR rules tend to generate visible forum threads about hosts getting shut down, and San Mateo isn't producing that kind of noise. That's not proof of anything, just an honest read of what wasn't there to find.

Frequently Asked Questions

Can you legally run an Airbnb in San Mateo in 2026?

Yes, as long as you register the property with the city first. San Mateo Municipal Code Chapter 5.66 allows short-term rentals in any legal dwelling unit except accessory dwelling units, provided you register through the city's HdL portal, pay the $250 annual fee, and follow the operating standards: an occupancy cap, parking requirements, a 24/7 local contact person, and a 120-day annual limit if you're not staying on-site during bookings.

How much does a San Mateo short-term rental registration cost?

The registration fee is $250 a year, non-refundable, and it's always due on July 1, regardless of when during the year you first apply. That means registering mid-year buys you less than a full 12 months before the first renewal. A separate Business Tax Certificate is also required and is calculated on gross receipts rather than a flat amount, so its cost varies by how much the property earns.

What happens if you rent your San Mateo property short-term without registering?

You risk both registration-specific and general municipal penalties. The city can deny or revoke a registration for violations, which locks you out of reapplying for 24 months, and separately, general code violations run $100 to $500 for repeat infractions or up to $1,000 and six months in jail if charged as a misdemeanor. An administrative penalty of up to $1,000 per day can also apply if a violation goes uncorrected.

Do you have to collect San Mateo's transient occupancy tax on an Airbnb booking?

Yes, in almost every case. San Mateo's combined Transient Occupancy Tax runs 14%, made up of a 12% general tax and a 2% special tax, and it applies to any stay of 30 consecutive days or less. As of this reading, San Mateo doesn't appear on Airbnb's official California collection list, so the platform isn't representing that it automatically collects this for you the way it does in some neighboring cities. Check your host dashboard's tax settings before your first booking.

Can you rent an accessory dwelling unit (ADU) short-term in San Mateo?

No. San Mateo's short-term rental ordinance specifically excludes accessory dwelling units from its definition of an eligible dwelling unit, and a separate section of the zoning code requires any ADU or junior ADU rental to run 30 consecutive days or longer. That's consistent with California's own statewide ADU law, which sets the same 30-day floor, so there's no path to short-term ADU rentals anywhere in the state, not just in San Mateo.

Last verified: July 2026. Every ordinance, tax rate, state law, and contact detail in this guide links to or comes from its official source.