California county business license guide
Last updated: August 1, 2026
The hardest part of starting a business in Contra Costa County is often finding the right local office. A business inside Concord, Richmond, Antioch, Walnut Creek, or another city usually starts with that city. A business in an unincorporated area usually starts with Contra Costa County.
The local license is only one layer. You may also need zoning, a fictitious business name, a seller’s permit, health approval, building or fire review, an employer account, or a professional license.
Bottom line
Contra Costa County requires a county business license tax for business activity in the unincorporated area. The county says this can apply even when the business is based outside the county or already has a license from a city.
If the business is located and works only inside an incorporated city, start with that city’s business license or business tax office. If the business also works in unincorporated Contra Costa County, it may need both the city license and the county license.
Do not apply until you have checked the exact address. A mailing address can use a city name even when the property is outside that city’s legal boundary.
Quick start: what to do first
- Write down every place where you will work. Include your home, office, store, job sites, rental property, and customer locations.
- Check each address in the county’s business license address lookup. It should point you to a city or the county.
- Ask about zoning before signing a lease. A license tax receipt does not prove that your activity is allowed at the property.
- Apply to the correct local government. Use the city if the address is inside city limits. Use Contra Costa County for unincorporated-area business activity.
- Check countywide and state steps. These may include an FBN, health permit, seller’s permit, employer account, or professional license.
- Save renewal dates and approval records. Keep the license, permit conditions, payment receipt, approval emails, and contact notes in one folder.
Contra Costa County license facts
| County license area | Business activity in unincorporated Contra Costa County |
|---|---|
| County licensing office | Contra Costa County Treasurer-Tax Collector |
| Current general county fee | $100 per year plus $10 per employee, according to the county’s current business license page |
| County renewal date | June 30 each year |
| Planning office | Contra Costa County Department of Conservation and Development for unincorporated-area zoning and land use |
| County name filing | Fictitious Business Name statement through the Contra Costa County Clerk-Recorder when required |
| State sales tax permit | California seller’s permit through CDTFA when the business sells or leases taxable tangible personal property |
First decision: is the business in a city or the unincorporated county?
This decision controls the local license, zoning, and building offices. It matters more than the city name shown in a mailing address.
The county provides a city and agency directory and address search. Use both near city boundaries.
| Your situation | Local office to start with | What to ask |
|---|---|---|
| Store, office, home, or warehouse inside a city | The city’s business license, finance, or revenue office | Business license or tax registration, zoning clearance, home occupation rules, building and fire review |
| Business location in an unincorporated area | Contra Costa County Department of Conservation and Development, then the Treasurer-Tax Collector | Property use verification, home occupation permit, land-use approval, county business license |
| Business based in a city but working at unincorporated job sites | The home city and Contra Costa County | Whether both local licenses are required for the work locations |
| Mobile, delivery, contracting, vending, or event business | Every city or unincorporated area where the activity occurs | Out-of-town business license, vendor permit, event permit, health permit, parking or route rules |
For a simple explanation of these government layers, read our guide to city licenses, county licenses, and state registrations.
Contra Costa County business license for unincorporated areas
The county calls its general license an annual business license tax for unincorporated-area activity. It shows that the tax was paid, but it does not replace zoning, building, health, fire, or professional approvals.
When the county license may apply
- Your main business location is in an unincorporated part of Contra Costa County.
- You run a home-based business from an unincorporated address.
- You are based in a city or another county but perform work in unincorporated Contra Costa County.
- You are a state-licensed contractor based in, or doing business in, the unincorporated area.
- You operate a part-time, hobby-related, temporary, or transient business in the unincorporated area.
County fee, renewal, and late-payment rules
The county’s current business license information page lists the general annual fee as $100 plus $10 per employee. New-business fees are prorated from the beginning of the quarter in which the business starts, except for outside contractors.
The license must be renewed by June 30. The county lists a 25% late penalty and 18% annual interest on late payments. Temporary or transient businesses are listed at $100 per day, paid in advance. Fee rules can change, so check the official page again before paying.
Do not treat the license as property approval
The county states that businesses must meet zoning and building requirements. Check the intended use before signing a lease, moving equipment, remodeling, or opening to customers.
County application order
- Confirm that the address or work area is unincorporated.
- Contact the Department of Conservation and Development at 925-655-2700 for zoning and planning requirements.
- Get the required property use verification, home occupation approval, short-term rental approval, or other planning document.
- Gather supporting records, such as an FBN filing, entity number, seller’s permit, professional license, contractor license, health permit, tobacco license, or alcohol license when relevant.
- Follow the county’s business license application instructions and complete the online application.
The online application must be completed in one session, so gather documents first. The county Tax Collector’s main contact number is 925-608-9500.
Changes, extra locations, and closing
The county says the license is tied to the owner, business type, and location and cannot be transferred. It also says each location needs a separate license. Contact the Tax Collector before moving, adding a site, or changing ownership or activity.
City business license rules are separate
Each Contra Costa city can set its own license name, tax method, renewal cycle, zoning process, and special permits. A county license does not cover city activity, and a city license does not cover unincorporated work.
| City example | What the official page says | Where to start |
|---|---|---|
| Concord | A business license is required for businesses conducting business in Concord, including home-based and out-of-town businesses. | City of Concord Business Licenses |
| Richmond | Businesses or persons conducting business in Richmond must have a City of Richmond business license. The business tax system uses activity and gross-receipts rules. | City of Richmond Business Licenses |
| Antioch | The city recommends checking with Planning before filing. Antioch licenses are issued for one year and must be renewed annually. | City of Antioch Business License |
| Walnut Creek | The city provides an online self-service system for business license functions. Confirm zoning and activity-based permits with the city before opening. | City of Walnut Creek Self Service |
These are examples. Use the exact city for each location. Ask whether an out-of-town contractor, mobile service, landlord, vendor, or event seller must register.
Do not confuse the license with an FBN, LLC, or seller’s permit
These filings solve different problems and do not replace one another. Our business license, LLC, DBA, and seller’s permit comparison explains the differences.
Fictitious Business Name, also called a DBA
Contra Costa County uses the term Fictitious Business Name, often shortened to FBN. The County Clerk-Recorder handles this name filing. It is separate from a city or county business license.
Start with the Clerk-Recorder’s Fictitious Business Name page. The county allows the form to be prepared online, but the filing must be signed and submitted with payment. If the owner is an LLC, corporation, or limited partnership, the county may require filed entity records from the California Secretary of State.
Publication may be required. The county’s FBN publication instructions explain the newspaper and proof steps. Missing the deadline can require a new filing and new fees.
LLC or corporation
An LLC or corporation is a legal business structure filed at the state level. It does not approve your address, give zoning permission, create a local license, or issue a seller’s permit. Use the California Secretary of State bizfile portal for entity filings and records.
Seller’s permit
A California seller’s permit is a state sales-and-use-tax permit. CDTFA says retailers and wholesalers selling or leasing taxable tangible personal property may need one.
Check the CDTFA seller’s permit rules. For more detail, see our guide to a seller’s permit versus a business license.
Zoning, home occupation, building, and fire approvals
A license tax handles registration or tax. Zoning decides whether the activity is allowed. Building and fire reviews cover the space and proposed work.
Unincorporated-area planning
Contra Costa County lists Property Use Verification as part of the county business license process. It also lists Home Occupation Permits, special-use approvals, and land-use permits for different activities. Review the county’s planning approvals for businesses.
Building, planning, and public works applications are submitted through the county’s ePermits Center. The county planning agency mainly reviews unincorporated properties. Incorporated cities have their own planning offices, even when the county provides some building services under a local agreement.
Home-based businesses
Home-based businesses in unincorporated Contra Costa County must pay the county business license tax and follow residential zoning rules. The county describes a home occupation permit as the local approval for operating a business from residential property.
Tell planning about visits, employees, deliveries, inventory, tools, noise, signs, vehicles, storage, and garage use. “Online” is not enough when products or people come to the home.
Our guides to the home occupation permit and running a business from home show what local zoning offices usually ask.
Food, mobile, rental, and regulated businesses
Restaurants, food sellers, and mobile food
Contra Costa Health Environmental Health regulates many food operations, including restaurants, markets, caterers, cottage food businesses, farmers markets, temporary food events, production kitchens, and mobile food facilities.
A new or remodeled food facility should check food service licensing and plan review before construction. Existing food businesses changing ownership may also need county evaluation. The broader Contra Costa food safety and permit page lists food-business categories and applications.
A food truck may need a county health permit, commissary papers, vehicle inspection, fire review, and local vending approval. Use our food truck permit guide, then confirm each local step.
Hazardous materials and waste
Businesses that generate any amount of hazardous waste or handle hazardous materials at or above program thresholds may need a Contra Costa County CUPA permit. This can affect auto repair, body shops, manufacturing, laboratories, pool service, fuel storage, cleaning operations, and other businesses using regulated materials. Start with the county’s Hazardous Materials permit page.
Short-term rentals
In unincorporated Contra Costa County, a short-term rental may operate only after a county short-term rental permit is issued. A county business license and transient occupancy tax registration may also apply. Check the county’s short-term rental process. A rental inside a city must follow that city’s rules instead.
Online sellers and marketplace businesses
An online business still has a physical base. The home, office, storage site, warehouse, or shipping location can trigger a city or county license and zoning review. Product sellers should also check the seller’s permit rules. Our online store business license guide explains the location, inventory, marketplace, and sales-tax questions.
California state and federal requirements
Local approval does not complete every state or federal step. Match each item to the agency that controls it.
| Requirement | Who may need it | Official starting point |
|---|---|---|
| California entity filing | LLCs, corporations, limited partnerships, and registered out-of-state entities | California Secretary of State bizfile |
| Seller’s permit | Many retailers, wholesalers, makers, online sellers, and temporary sellers of taxable goods | California Department of Tax and Fee Administration |
| Employer payroll tax account | Businesses with employees that meet California’s registration threshold | California EDD employer registration |
| Professional or occupational license | Regulated professions and services | California DCA License Search and the correct licensing board |
| Contractor license | Construction contractors and regulated trades | Contractors State License Board license check |
| EIN | Many entities and employers, plus other businesses that need a federal tax ID | IRS EIN page; the IRS issues EINs for free |
Use CalGOLD to identify possible permits by location and business type. CalGOLD points to agencies but does not issue licenses. For federally regulated activities such as alcohol manufacturing, aviation, agriculture, interstate transport, broadcasting, or firearms, use the SBA federal license and permit guide to find the correct agency.
For a full state overview, read our California business license guide.
Real-world examples
Home-based consultant at an unincorporated address
First confirm that the address is unincorporated. Ask county planning about a home occupation permit and property use verification. Then apply for the county business license. Check an FBN if using a trade name.
Contractor based in Concord
Check the Concord business license and the state contractor license. If the contractor accepts work in unincorporated Contra Costa County, ask the county whether its license is also required. A job permit is separate from the business licenses.
Restaurant planned in Richmond
Start with Richmond business licensing and zoning. Contact Contra Costa Health before building or changing ownership. Building, fire, sign, alcohol, and food approvals may all apply before opening.
Online seller shipping from home
Check whether the home is in a city or unincorporated county. Ask about home-business rules, then check the CDTFA seller’s permit and an FBN. Inventory, deliveries, and customer pickups can change the zoning answer.
A business that crosses the county line should repeat the location check. For nearby East Bay activity, our Alameda County business license guide explains that county’s city-versus-unincorporated rules.
Common mistakes
- Using the mailing city instead of checking the legal boundary. Always use the county lookup and confirm with the local office.
- Thinking an LLC is a business license. An entity filing does not give local permission to operate.
- Getting an FBN but skipping the license. An FBN is a name filing only.
- Getting a seller’s permit but skipping local rules. A state tax permit does not replace a city or county license.
- Signing a lease before zoning review. The property may not allow the use or may need expensive changes.
- Assuming one local license covers every work area. Mobile businesses, contractors, vendors, and delivery services should check each jurisdiction.
- Using old fee or renewal information. Verify the official page before paying and save proof of the date checked.
- Buying a food business without agency review. Health, building, and fire approvals may not transfer automatically.
What to ask the city or county
Have the exact address, business activity, start date, owner name, public business name, employee count, customer-visit plan, storage plan, and work locations ready.
Hello. I plan to operate a [business type] at or from [address]. Can you confirm whether this property is inside the city or in unincorporated Contra Costa County? Which office handles the local business license and zoning review?
The business will involve [customers, employees, deliveries, inventory, equipment, signs, vehicles, food, or other activity]. Is this use allowed at the address? Do I need property use verification, a home occupation permit, a land-use permit, building approval, fire review, or sign approval?
Will I need a license because the business is based here, because I perform work here, or both? What documents must I attach? What is the current fee, renewal date, and late-payment rule?
Write down the date, department, employee name if provided, exact permit names, deadlines, and any next office you were told to contact.
Official sources to check
- Contra Costa County business license information, fees, and renewals
- Contra Costa County business license address lookup
- How to apply for a Contra Costa County business license
- Contra Costa County city and agency directory
- County planning approvals for businesses
- Contra Costa County permit portal
- Contra Costa County Fictitious Business Name filing
- Contra Costa Health food safety permits
- Contra Costa County hazardous materials permits
- Unincorporated Contra Costa County short-term rentals
- California CalGOLD permit assistance tool
- California seller’s permit information
- IRS Employer Identification Number information
About BusinessLicenseGuide.com
BusinessLicenseGuide.com explains U.S. business licenses, permits, registrations, tax accounts, and zoning steps in plain English. We are not a government agency, law firm, CPA firm, or filing service. We use official sources and help readers find the right office and questions to ask.
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Frequently asked questions
Does Contra Costa County require a general business license?
Yes, for business activity in unincorporated Contra Costa County. A business located in a city usually starts with that city, but it may also need the county license if it conducts business in an unincorporated area.
How much is the Contra Costa County business license?
As of August 1, 2026, the county’s official page lists $100 per year plus $10 per employee for the general license. New-business fees may be prorated. Temporary businesses, special licenses, and other situations can have different rules, so verify the current amount before paying.
When is the county business license renewed?
The county’s current page says the license must be renewed by June 30 each year. It also lists a 25% late penalty and 18% annual interest on late payments.
Do I need a county license if my business is inside a city?
Usually not when the business is located and operates only inside that city. If it also performs work or conducts business in unincorporated Contra Costa County, the county says both the city license and county license may be required.
Is an FBN the same as a business license?
No. An FBN is a fictitious business name filing handled by the County Clerk-Recorder. A business license or business tax registration is a separate local requirement handled by the city or county licensing office.
Do home-based businesses need a county license?
A home-based business at an unincorporated Contra Costa County address must check the county business license tax and home occupation rules. A home business inside a city must check that city’s license and zoning rules.
Does a California seller’s permit replace the local license?
No. A seller’s permit is a California sales-and-use-tax permit. It does not replace a city or county business license, zoning approval, health permit, building permit, fire approval, FBN, or professional license.
What should I check before signing a business lease?
Confirm the legal jurisdiction, zoning, allowed use, building and fire needs, health permits, parking, signs, accessibility work, and special permits. Get the answer for the exact address and business activity before committing to the space.
Disclaimer
This guide is for general information only. It is not legal, tax, accounting, insurance, real estate, employment, zoning, safety, or professional licensing advice. Requirements depend on the exact address, business activity, ownership, and agency interpretation. Fees, forms, portals, phone numbers, and deadlines can change. Confirm important details with the official city, county, state, federal, or special-district agency before filing, paying, signing a lease, building, or operating.
Update notes
Accuracy review: August 1, 2026
Next scheduled review: November 1, 2026
This update checked the county license area, current county fee, June 30 renewal date, late-payment terms, planning sequence, online application, county contact numbers, FBN process, food and hazardous-material permit pages, short-term rental rules, selected city license pages, California state registrations, and federal EIN guidance.