Running a food trailer in California requires permits from several different agencies, and they don’t substitute for each other. At minimum, you need county environmental health approval for the trailer itself, a commissary agreement, a state seller’s permit from the California Department of Tax and Fee Administration, food safety certifications for everyone who handles food, business registration, and a local vending permit in every city where you plan to sell. Food trailer permits in California work as layers, and skipping any one of them means you’re operating illegally even if the others are in order.
County Health Department Approval
The county environmental health department is the main gatekeeper. Most of the time, money, and paperwork sits here, and the process moves through three stages in a fixed order.
Plan Check
Before you build or buy a trailer, submit detailed plans to your county’s environmental health department. The plans typically include a scaled floor layout, a complete equipment list with make, model, and commercial certification for each piece, and plumbing diagrams showing water flow, tank volumes, and sink dimensions. The department reviews the design against the California Retail Food Code before you spend money on the build. Mistakes are cheapest to fix at this stage. A rejected plan is far better than a failed inspection on a finished trailer.
Commissary Agreement
Every mobile food facility must operate from an approved commissary unless it qualifies for a narrow community-event exception with available water and waste disposal. A commissary is a licensed, fixed-location commercial kitchen where your trailer goes when it isn’t serving customers. You use it to dump wastewater, dispose of trash, refill potable water, and store food and supplies. The trailer itself must also be stored at the commissary or another location the enforcement agency has approved.1California Legislative Information. California Health and Safety Code HSC 114295
A signed commissary agreement must be on file with the county. Monthly rental typically runs several hundred dollars depending on location and services, and finding available space in dense urban areas can be one of the harder logistical steps.
Physical Inspection and Health Permit
Once the trailer is built and the commissary agreement is in place, an environmental health specialist inspects the completed vehicle against the approved plans. They check sink function, water heater operation, refrigeration temperatures, fire suppression, and general construction. After you pass and pay the fees, the county issues your operational health permit, which must be renewed annually.2California Legislative Information. California Health and Safety Code HSC 114294 – Mobile Food Facilities
Build-Out Standards Your Trailer Must Meet
The health permit depends on the trailer passing physical inspection under the California Retail Food Code.2California Legislative Information. California Health and Safety Code HSC 114294 – Mobile Food Facilities A few requirements catch first-time operators:
- A three-compartment warewashing sink with two integral metal drainboards if you prepare non-prepackaged food. Each compartment is at least 12 by 12 by 10 inches (or 10 by 14 by 10). A separate handwashing sink at least 9 by 9 by 5 inches is also required, and if the two sinks sit within 24 inches of each other, a six-inch metal splashguard has to separate them.3Orange County Health Care Agency. California Retail Food Code – Section 114311
- A wastewater tank at least 50 percent larger than your potable water tank, and never less than 7.5 gallons. Add 15 percent more capacity if you use potable water for food or drink preparation, plus additional capacity equal to one-third of your ice cabinet volume if you display or store food on ice. Undersizing by even a few gallons will fail you at inspection.4Orange County Health Care Agency. California Retail Food Code – Section 114240
- Mechanical exhaust ventilation meeting the California Mechanical Code for any cooking equipment producing grease-laden vapors, including fryers, griddles, ranges, broilers, and woks.
- Operation within 200 feet of an approved toilet and handwashing facility whenever you stop to sell for more than an hour. The enforcement agency can approve alternatives, but plan for this when scouting spots.5California Legislative Information. California Health and Safety Code 114315
An exception exists for operations that only heat, portion, assemble, or dispense non-potentially-hazardous foods: if you wash and sanitize all utensils daily at your commissary and carry enough clean spares, you can skip the warewashing sink.6Orange County Health Care Agency. California Retail Food Code – Section 114313
Fire Safety Approval
Fire requirements scale with what you cook. Every trailer with open flames or heat-producing equipment must carry a properly charged, accessible fire extinguisher. Trailers using deep-fat fryers, griddles, or other equipment that generates grease-laden vapors face two more requirements: a Class K extinguisher within 30 feet of the cooking equipment, and an automatic fire suppression system meeting UL 300 standards.7Garden Grove Fire Department. Approved Commercial Cooking Systems and UL 300 Regulation
That suppression system must be inspected and serviced every six months, and again immediately after any activation. Skipping a service cycle puts you out of compliance. The trailer also needs a fully stocked first-aid kit, a second exit opening of at least 24 by 36 inches, proper insulation around gas appliances, and equipment secured against movement in transit.
Food Safety Certifications for Your Staff
Food Handler Cards
Every employee who handles food must get a food handler card within 30 days of hire and keep it valid the whole time they work for you. Cards last three years and are recognized statewide, so a worker who earned one at a previous job doesn’t need a new one. Training must come from an ANSI-accredited provider, runs about two and a half hours, and ends with a 40-question exam requiring 70 percent to pass.8California Legislative Information. California Health and Safety Code HSC 113948 Online courses generally cost between $7 and $24.
Certified Food Protection Manager
At least one owner or employee at each facility handling non-prepackaged, potentially hazardous food must hold a Certified Food Protection Manager certificate. That covers essentially every trailer doing real cooking. When you start operations, change ownership, or lose your only certified manager, you have 60 days to get someone certified. A CFPM certificate covers only one facility, so you can’t share a manager across multiple trailers.
Business Registration and Tax Setup
Seller’s Permit
Anyone regularly selling tangible goods in California, prepared food included, must register for a Seller’s Permit with the California Department of Tax and Fee Administration. Registration is free. You’ll need your personal ID details, business location, and an estimate of monthly sales volume. The permit authorizes you to collect and remit sales tax.9California Department of Tax and Fee Administration. Do You Need a California Sellers Permit
Business Entity and EIN
Forming an LLC or corporation through the California Secretary of State provides personal liability protection, which matters when you’re serving food to the public. An LLC limits your personal exposure if someone gets sick or injured; a corporation does the same and creates a separate tax entity.10California Secretary of State. Starting a Business – Entity Types You also need an Employer Identification Number from the IRS if you hire employees, operate as a partnership, or form a corporation or LLC.11Internal Revenue Service. Employer Identification Number
Self-Employment Tax
Sole proprietors and LLC members owe federal self-employment tax of 15.3 percent on net earnings: 12.4 percent for Social Security and 2.9 percent for Medicare.12Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) For 2026, the Social Security portion applies to the first $184,500 of combined wages and self-employment income.13Social Security Administration. Contribution and Benefit Base The Medicare portion has no cap, and an additional 0.9 percent Medicare surcharge applies once net self-employment income exceeds $200,000, or $250,000 for married filing jointly.
Local Vending Permits
County health approval makes the trailer legal to serve food. It doesn’t give you the right to park anywhere and sell. Each city or municipality where you operate requires its own permission, which can mean a local business license, a street vending permit, or an encroachment permit depending on the jurisdiction. Some cities also require proof of general liability insurance before they’ll issue a vending permit.
California’s Safe Sidewalk Vending Act (SB 946) sets statewide limits on how far cities can go. A local government cannot confine sidewalk vendors to specific neighborhoods unless the restriction ties to objective health, safety, or welfare concerns. Cities cannot cap the total number of vendors, require approval from private parties, or ban vending in public parks unless an exclusive concession agreement exists for that park. What cities can do is adopt reasonable time, place, and manner rules tied to legitimate safety concerns, such as restrictions near certified farmers’ markets during operating hours or near temporary special events.14California Legislative Information. Senate Bill 946 – Safe Sidewalk Vending Act
Penalties for violating a local vending ordinance that complies with SB 946 start at a maximum $100 administrative fine for a first offense.14California Legislative Information. Senate Bill 946 – Safe Sidewalk Vending Act Local authorities can also restrict hours and how long you stay at any single spot. Contact the planning department in every city where you plan to sell and get their specific requirements before you set up.
Accessibility and Workplace Safety
If your trailer has a customer-facing service counter, federal accessibility standards require the accessible portion to sit no higher than 36 inches above the ground. For a parallel approach, that section must be at least 36 inches long. For a forward approach with knee and toe space underneath, the minimum drops to 30 inches.15U.S. Access Board. Chapter 9 Built-In Elements
Federal OSHA rules also apply to the trailer as a workplace. If you provide portable fire extinguishers for employee use, you must train employees on their operation at hire and annually after that.16Occupational Safety and Health Administration. Food Services – Fire Safety Keep grills and ductwork free of grease buildup, empty grease traps on a regular schedule, and store flammables away from burners and ovens. These are the kinds of violations that get expensive fast after an incident.