California RV laws cover registration, licensing, insurance, size and weight limits, towing, parking, and emissions, and the exact rules that apply to you depend on your motorhome’s weight, length, fuel type, and whether you tow. Miss a step and you can face fines, a registration hold, or an order to stop driving at the roadside.
Register Your RV Within 20 Days
Every motorhome and travel trailer operated or parked on California roads must be registered with the DMV. If you buy an RV in California or move into the state with one, you have 20 days to complete registration.1State of California Department of Motor Vehicles. Vehicle Registration Requirements – Section: Out-of-State Vehicles You submit an Application for Title or Registration (Form REG 343), proof of ownership, and a smog or emissions certificate when applicable. Fees track the vehicle’s value, weight, and county.
A new RV from a California dealer comes with a Manufacturer’s Statement of Origin and dealer report of sale. A used RV bought privately needs the previous owner’s signed title, and a Bill of Sale (Form REG 135) documents the transaction.2California Department of Motor Vehicles. Vehicle Industry Registration Procedures Manual – Recreational Vehicles
An RV bought out of state and brought into California triggers a use tax at your county’s combined sales tax rate, which ranges from 7.25% to 11.25% in the highest-tax jurisdictions like Lancaster and Palmdale.3California Department of Tax and Fee Administration. California City and County Sales and Use Tax Rates You may avoid the tax if you can show the vehicle was bought for use outside California and was not brought into the state during the first 12 months of ownership. The California Department of Tax and Fee Administration evaluates documentary evidence like out-of-state registration to support the exemption.4California Department of Tax and Fee Administration. 12 Month Test – Not Purchased for Use in California
What License You Need
A standard Class C license covers most RV owners. You can drive a motorhome (called a “house car” in the Vehicle Code) of any length on a Class C as long as it’s a single vehicle and you’re not towing something heavy. License class questions start mattering when you tow or when the motorhome itself is very heavy.
- Class C (standard) covers motorhomes operated as a single unit and towing a single trailer with a GVWR of 10,000 pounds or less.
- Noncommercial Class B is required for a single vehicle over 26,000 pounds GVWR when not towing over 10,000 pounds. Some of the heaviest Class A diesel pushers cross this threshold.
- Noncommercial Class A is required when towing a trailer or fifth-wheel with a GVWR over 10,000 pounds, or when towing more than one vehicle.5Caltrans. Vehicle Lengths – Section: Vehicle Combinations – Basic Law
Upgrading to a Class A or B noncommercial license involves a written knowledge test and a behind-the-wheel driving test covering backing, turning, and vehicle control. If the RV or tow vehicle uses air brakes, you’ll also need to pass an air-brake knowledge and skills test.
Length, Weight, and Towing Rules
California’s basic vehicle length limit is 40 feet. Motorhomes can go up to 45 feet, but anything longer than 40 feet faces route restrictions. Local authorities set the access routes for motorhomes between 40 and 45 feet, and you can apply for access to additional routes. A denial must be based on a safety and engineering analysis, not arbitrary preference.6Caltrans. 45′ Motorhomes – Overview A motorhome 40 feet or shorter has no route restrictions. A combination vehicle — a motorhome towing a car or trailer — cannot exceed 65 feet total.5Caltrans. Vehicle Lengths – Section: Vehicle Combinations – Basic Law
Weight limits follow federal bridge formula standards. Single axles max out at 20,000 pounds, tandem axles at 34,000 pounds, and any combination at 80,000 pounds gross.7FHWA Operations – Department of Transportation. Bridge Formula Weights The California Highway Patrol enforces these limits at weigh stations and through roadside checks. If your RV is overweight, you may be ordered to offload cargo before continuing. Weigh your loaded rig at a certified scale before any long trip, especially if you’re towing.
Towing Rules Out-of-State Owners Miss
California’s trailer brake threshold is stricter than most states. Any trailer coach or camp trailer with a gross weight of 1,500 pounds or more must have its own brakes on at least two wheels, separate from the tow vehicle’s braking system.8California Legislative Information. California Code VEH Division 12 Chapter 3 Article 1 Section 26303 That’s half the 3,000-pound federal threshold. Safety chains or cables are required on all towed units as a backup if the hitch fails.
Triple towing — a trailer plus a vehicle behind your motorhome — is legal, but only for motor vehicles over 4,000 pounds unladen weight. Passenger vehicles cannot tow more than one unit regardless of weight.9California Legislative Information. California Vehicle Code 21715 The combination still cannot exceed 65 feet, and triple towing requires a noncommercial Class A license. Any vehicle towing a trailer must stay in the right-hand lane or lanes designated for slower traffic on highways. When no slower-traffic lanes are designated, you drive in the rightmost lane or as close to the right edge as practical.10California Legislative Information. California Vehicle Code VEH 21655 Extended side mirrors are required whenever towing.
Insurance Minimums
California requires liability insurance on every vehicle operated or parked on its roads, RVs included. The state minimums are $30,000 for injury or death to one person, $60,000 for injury or death to more than one person, and $15,000 for property damage.11State of California Department of Motor Vehicles. Auto Insurance Requirements – Section: Minimum Liability Insurance Requirements
Those minimums apply across all motor vehicles, but the math on an RV is different. A 30,000-pound motorhome in a highway accident can generate claims that blow past $60,000 in medical costs alone. Uninsured and underinsured motorist coverage fills the gap when someone else hits you and can’t pay. If your RV is your primary residence, full-time RV insurance adds personal liability coverage for incidents at your campsite, similar to a homeowner’s policy. Any RV with an outstanding loan or lease will require full coverage until the balance is paid. Letting insurance lapse can trigger registration suspension, fines, or impoundment.
Where You Can Park and Camp
RV parking in California is governed primarily at the local level, and the rules change dramatically between cities. Many prohibit oversized vehicles from parking on residential streets without a permit. San Diego, for example, offers a Temporary Overnight Recreational Vehicle Permit that allows parking on your own block for up to three consecutive 24-hour periods at a time, with a maximum of 72 days of permits per year.12City of San Diego Official Website. Temporary Overnight Recreational Vehicle Permit Other cities ban overnight RV parking in residential zones outright. Check your city’s municipal code before assuming street parking is an option.
Highway rest stops allow stays of up to eight hours in any 24-hour period, with no exceptions for RVs.13Cornell Law School. Cal. Code Regs. Tit. 21, 2205 – General Commercial parking lots like retail stores sometimes tolerate overnight RVs, but enforcement is entirely up to the property owner.
On federal public lands, both the Bureau of Land Management and the U.S. Forest Service allow dispersed camping outside developed campgrounds. BLM land generally limits dispersed camping to 14 days within any 28-day period, after which you must relocate at least 25 to 30 miles away. Exact relocation distances vary by field office, so check with the local office before planning an extended stay.14Bureau of Land Management. Camping on Public Lands BLM Long-Term Visitor Areas in the California desert allow camping for up to seven consecutive months with a seasonal permit.
National Forest rules can be considerably more restrictive. The Angeles National Forest limits camping outside developed campgrounds to seven consecutive days per calendar year through December 2026, and camping within 300 feet of a road centerline is limited to three days per calendar year. Violations carry fines up to $5,000 for individuals or six months in jail.15U.S. Department of Agriculture Forest Service. Planning to Camp? Stay Limits and Dispersed Camping Restrictions Fire restrictions can close areas to camping entirely during high-risk periods.
Emissions Testing for Diesel RVs
CARB’s Clean Truck Check program covers any non-gasoline motorhome with a GVWR over 14,000 pounds. Diesel motorhomes with engines from 2012 or earlier face a smoke opacity test and a visual inspection of emissions control equipment, with annual compliance testing and fees. Non-commercial motorhomes used only for recreation are not exempt. They follow the same compliance requirements as any other covered vehicle.16California Air Resources Board. Clean Truck Check – Motorhome Fact Sheet The DMV places registration holds on vehicles that fall behind, so a diesel RV owner who ignores the program can find themselves unable to renew registration at all.
Waste Disposal and Idling
Dumping RV sewage or gray water anywhere other than a designated dump station or approved sewer connection violates California Penal Code 374.3, which carries fines up to $10,000 and potential jail time of up to six months. Many municipalities also restrict engine idling in residential areas.
Using Your RV as a Home Office
If you use your RV as a home office, you may be able to deduct a portion of its expenses on your federal taxes. IRS Form 8829 allows deductions for business use of your home, and the IRS treats an RV the same as any other dwelling for this purpose, provided a dedicated area is used exclusively and regularly for business. The space must serve as your principal place of business, meaning you handle administrative tasks like billing, bookkeeping, and scheduling there and have no other fixed location where you do that work.17Internal Revenue Service. 2025 Instructions for Form 8829 – Expenses for Business Use of Your Home