Thinking About Listing Your Diamond Bar Home on Airbnb? Read This First.
Short-term rentals have become one of the most compelling ways for Southern California homeowners to generate income from their properties. But before you list your Diamond Bar home on Airbnb or Vrbo, there is a critical piece of information you need to understand — one that could save you from significant fines and legal exposure.
As of this writing, the City of Diamond Bar has a citywide ban on short-term rentals. That ban is actively enforced. Understanding what it means for your property, how unincorporated LA County addresses are treated differently, and what your options are going forward is essential before you make any decisions.
Important disclaimer: Short-term rental regulations change frequently and vary by jurisdiction. The information in this post is provided for general educational purposes only and is not legal advice. Always verify current requirements directly with the City of Diamond Bar (diamondbarca.gov) or Los Angeles County before listing your property.
The Diamond Bar STR Ban: What the Ordinance Actually Says
In early 2023, the Diamond Bar City Council unanimously passed an ordinance reinforcing and clarifying the city’s ban on short-term rentals. The ordinance amended both Title 5 (Business Licensing) and Title 22 (Development Code) of the Diamond Bar Municipal Code — sections 5.08.050 and 22.080.020.
The ordinance does two things: it clarifies the definition of a short-term rental (any rental of an entire home, a room, or any portion of a home for fewer than 30 consecutive days), and it explicitly prohibits both the operation and advertising of short-term rentals within city limits. That means even listing your property on Airbnb or Vrbo without a guest ever checking in is a violation.
Penalties are serious. Violators can face fines of up to $1,000 per day of violation, as well as potential jail time. The City’s Community Development Department handles enforcement and can be reached at commdev@diamondbarca.gov or (909) 839-7030.
Is Your Address in Diamond Bar City Limits — or LA County Unincorporated?
Here is where it gets more nuanced, and it’s a distinction many homeowners miss entirely.
Not every address with a “Diamond Bar” mailing address sits within Diamond Bar city limits. Some properties in the Diamond Bar area fall within unincorporated Los Angeles County, which is governed by the County rather than the City. These two jurisdictions have very different rules for short-term rentals.
If your property is in an unincorporated area of LA County, the city’s ban does not apply to you. Instead, you fall under the LA County Short-Term Rental ordinance, which has its own registration and compliance requirements.
The only way to know for certain which jurisdiction governs your property is to verify your parcel’s status directly with the City of Diamond Bar or LA County. You can use the LA County Assessor’s parcel lookup tool or call the City’s Community Development Department to confirm before taking any action.
Short-Term Rentals in Unincorporated LA County
For properties that fall within unincorporated LA County — not the City of Diamond Bar — the LA County Treasurer and Tax Collector oversees short-term rental compliance. Here is what those hosts are generally required to do:
Short-Term Rental Registration Certificate
Hosts must obtain a Short-Term Rental Registration Certificate from the LA County Treasurer and Tax Collector before renting out their property. Operating without a valid certificate can result in noncompliance fees, administrative fines, and removal of listings from hosting platforms. Platforms like Airbnb can also be fined up to $1,000 per day for listing uncertified properties.
Primary Residence Requirement
LA County’s STR regulations apply to homeowners whose primary residence is located in unincorporated LA County and who are renting their home or room(s) for stays of 30 consecutive days or less. If the property is an investment property that is not your primary residence, different rules may apply.
Transient Occupancy Tax (TOT)
All short-term rental hosts operating in unincorporated LA County are required to collect and remit Transient Occupancy Tax from guests. TOT must generally be submitted within 30 days after the rental start date. Platforms like Airbnb often collect and remit TOT on behalf of hosts in some jurisdictions, but it is the host’s responsibility to confirm whether that applies to their specific address.
HOA Considerations
Even if your property is in an unincorporated area where county STR rules permit hosting, your Homeowners Association may have its own restrictions — or an outright prohibition — on short-term rentals. HOA CC&Rs (Covenants, Conditions, and Restrictions) are legally binding and can override your ability to list on Airbnb or Vrbo regardless of what local government allows. Review your HOA documents carefully or consult an attorney before listing.
California SB 346: What Hosts Across the State Need to Know
In 2025, California passed Senate Bill 346, known as the California Short-Term Rental Facilitator Act. It went into effect on January 1, 2026, and it changes how local governments enforce STR regulations across the state.
Under SB 346, local governments now have explicit authority to require short-term rental platforms — including Airbnb and Vrbo — to share data about listings with local authorities. Specifically, jurisdictions that adopt ordinances based on SB 346 can require platforms to submit:
- The physical address of each listed property
- The property’s listing URL
- The assessor parcel number (APN)
- Unit-specific information for multi-unit properties
In jurisdictions that have passed SB 346-based ordinances, platforms must also display the host’s local STR license number and TOT certificate number in every listing. Cities can require quarterly or monthly platform data reports and may impose administrative fines of up to $10,000 per day for platform noncompliance.
What this means in practical terms: the era of “flying under the radar” on STR compliance is ending in California. Platforms are being compelled to share host data with local enforcement agencies, making it significantly easier for cities and counties to identify unlicensed or non-compliant listings.
Insurance: A Step Most Hosts Skip
Whether you’re hosting legally under county rules or exploring your options, standard homeowners insurance policies almost universally exclude coverage for commercial rental activity. If a guest is injured on your property during a paid stay, your existing policy may deny the claim entirely.
Hosts should explore:
- Airbnb AirCover for Hosts — platform-provided coverage with limitations
- Short-term rental insurance riders — added to an existing homeowners policy
- Standalone STR insurance policies — from providers such as Proper Insurance or Slice
Speak with an insurance professional who understands vacation rental liability before your first guest checks in.
What If I Own a Property Near Diamond Bar That Might Be Eligible?
If your property is in an unincorporated LA County area near Diamond Bar and you believe you may be eligible to operate a short-term rental under county rules, working with an experienced local property manager can make the compliance process significantly smoother. The right partner knows which licenses to file, how to handle TOT registration, and how to position your listing to perform competitively in the Southern California market from day one.
Frequently Asked Questions
Can I Airbnb my home in Diamond Bar, CA?
As of 2026, short-term rentals are banned within Diamond Bar city limits, with fines up to $1,000 per day for violations. However, some addresses that carry a Diamond Bar mailing address may be located in unincorporated LA County, where different rules apply. Verify your property’s jurisdiction before listing.
Do I need a permit for Airbnb in Diamond Bar?
Within Diamond Bar city limits, no permit is available — short-term rentals are prohibited entirely. For properties in unincorporated LA County near Diamond Bar, a Short-Term Rental Registration Certificate from the LA County Treasurer and Tax Collector is required before hosting.
What is SB 346 in California?
California Senate Bill 346, in effect as of January 1, 2026, authorizes local governments to require short-term rental platforms like Airbnb and Vrbo to share host and property data with local enforcement agencies. It is designed to improve compliance with local STR regulations and transient occupancy tax requirements statewide.
Unsure Where Your Property Stands?
Navigating STR regulations in LA County and the Diamond Bar area is genuinely complex — jurisdiction lines aren’t always obvious, and the rules have evolved quickly. Stay Hello Sunshine manages properties in and around Diamond Bar and understands the local compliance landscape.
Reach out to our team — we’re happy to help you figure out your options.
