Call the Right CSLB Number Before You Wait on Hold
The main Contractors State License Board California phone number is 800-321-CSLB (2752). California consumers, applicants, licensed contractors and home improvement salespersons use this number for license information, forms, complaint help and many general CSLB questions.
This page keeps the CSLB phone numbers, office addresses, email routes, license-check link and complaint contact path in one place, so you do not waste time calling the wrong California contractor office.
Quick Answer: The Main CSLB Phone Number Is 800-321-CSLB
Call 800-321-CSLB (2752) for CSLB’s 24-hour licensing and consumer information line. CSLB lists normal public contact hours as Monday through Friday, 8:00 a.m. to 5:00 p.m. Pacific Time, closed holidays. If you are calling from outside California, CSLB lists 916-255-3900.
Official CSLB Contact Screenshot for This Page
This image should appear near the top of the article because the search intent is contact-based. A reader wants to know they are using the real California CSLB contact page before calling or clicking a government form.
Contractors State License Board California Phone Numbers by Purpose
Use the right number for the reason you are calling. The main CSLB number works for many public information questions, but the agency also lists separate enforcement, complaint, licensing and office lines.
| Purpose | CSLB phone number | Best use |
|---|---|---|
| Main CSLB licensing and consumer information | 800-321-CSLB (2752) | General CSLB questions, license status by phone, publications, forms and routing to common services. |
| Outside California callers | 916-255-3900 | Use when the toll-free line is not practical from outside California. |
| Northern SWIFT unlicensed activity | 916-255-2924 | Report suspected unlicensed contractor activity in the Northern California enforcement area. |
| Central SWIFT unlicensed activity | 559-490-0580 | Report suspected unlicensed contractor activity in the Central California enforcement area. |
| Southern SWIFT unlicensed activity | 562-345-7600 | Report suspected unlicensed contractor activity in the Southern California enforcement area. |
| Sacramento Intake and Mediation Center | 916-843-6515 | Complaint intake or mediation routing connected with the Sacramento office. |
| Norwalk Intake and Mediation Center | 562-345-7530 | Complaint intake or mediation routing connected with the Southern California office. |
Official CSLB Links Readers Usually Need
Use these official pages after you know why you are contacting CSLB. Many California contractor questions can be handled faster online than by phone.
For phone numbers and offices
Use CSLB’s official contact page for headquarters, mailing address, Southern California office, hours, phone numbers, field offices and department emails.
For license or HIS registration lookup
Search by contractor license number, business name, personnel name, home improvement salesperson registration number or salesperson name.
For applications, renewals and forms
Use the forms page for original applications, renewals, address changes, personnel changes, classification changes and other CSLB paperwork.
For complaints or unlicensed activity
Use CSLB’s complaint pages for licensed and unlicensed project complaints, active-project complaints, solar complaints and contractor law violations.
Before You Call CSLB: Have These Details Ready
CSLB phone support can route you faster when you have the correct license, application or project information in front of you. Do not call with only a nickname, truck logo or partial company name if you can avoid it.
For consumers and homeowners
- Contractor license number, if shown on the bid, ad, truck, website or contract.
- Business name exactly as written on the contract or estimate.
- Project address, city and ZIP code.
- Signed contract, change orders, payment receipts and photos.
- Whether the contractor is licensed, unlicensed, abandoned the job, or is still active on the project.
For applicants and licensed contractors
- Application fee number or license number, if one has been issued.
- Business entity type and Secretary of State name for corporations or LLCs.
- Qualifier name and classification involved.
- Bond, workers’ compensation or renewal issue you are trying to fix.
- Email address and mailing address currently on CSLB records.
License Check by Phone vs Online License Check
CSLB says you can check license status online or by calling 800-321-CSLB (2752). Online lookup is usually better when you need to compare details because it can show more fields than a quick phone note.
Use the contractor license number first
A California contractor license number does not contain alphabetic characters and should be entered from the left without exceeding eight digits.
Try business-name search if needed
If the license number is missing, search by business name. CSLB recommends shortening the name if needed and leaving out “The” or “A” at first when those words begin the business name.
Check the exact record, not just a similar name
Compare the license name, classification, personnel, status, bond, workers’ compensation, complaint disclosure and business phone details shown in the official CSLB record.
Recheck before signing or paying
License status can change. Reopen the official record before you sign a California home improvement contract, pay a deposit or let the contractor start work.
Calling CSLB About a Complaint
CSLB investigates possible violations of California Contractors License Law involving licensed and unlicensed contractors, but the board explains that a CSLB investigation does not guarantee restitution. If your main goal is money recovery, court options may also need to be considered.
| Complaint question | What to do first | Phone or route |
|---|---|---|
| I want to file a construction complaint | Use CSLB’s online or mail complaint page and gather the contract, photos, payments and written messages. | CSLB complaint page |
| I submitted online but am not sure it went through | Do not submit a duplicate online complaint. | Call 800-321-CSLB and press 324 during normal business hours. |
| The contractor is unlicensed or advertising illegally | Use SWIFT / enforcement reporting and save the ad, photo, bid or license-claim evidence. | Northern 916-255-2924, Central 559-490-0580, Southern 562-345-7600. |
| The project is active and unsafe or abandoned | Document the jobsite, contract, permit status and contractor details. | File a Complaint Online |
| I need small-claims information | Use CSLB’s small claims guide and California court resources. | Call 800-321-CSLB or review the CSLB complaint resources. |
CSLB Payment and Phone Scam Warnings
Be careful with anyone who claims to collect CSLB fees by phone. CSLB’s forms page says fee payments are never requested or accepted over the telephone.
Do not pay CSLB fees by phone
CSLB lists mailed check or money order for many transactions, Sacramento headquarters payment options, and limited online credit-card payment for license and HIS registration renewal only. A caller demanding a CSLB fee over the phone should be treated as a red flag.
Home improvement down payment warning
For California home improvement projects, the legal down payment is generally limited to 10 percent of the contract price or $1,000, whichever is less. CSLB highlights this rule in consumer-safety guidance.
CSLB Office Addresses and Field Office Numbers
Most callers should start with the main CSLB number or the official online service. Use office addresses when a form, payment, investigation, field office or official mailing route requires it.
CSLB Headquarters
Southern California Office
| CSLB field office | Address | Phone |
|---|---|---|
| Fresno Investigative Center | 1277 East Alluvial Ave., Suite 106, Fresno, CA 93720 | 559-490-0580 |
| Norwalk Investigative Center | 12501 East Imperial Hwy., Suite 630, Norwalk, CA 90650 | 562-345-7610 |
| Orange County Investigative Center | 12501 East Imperial Hwy., Suite 640, Norwalk, CA 90650 | 562-345-7551 |
| San Bernardino Investigative Center | 1845 Business Center Dr., Suite 206, San Bernardino, CA 92408 | 909-890-2205 |
| San Diego Investigative Center | 9246 Lightwave Ave., Suite 130, San Diego, CA 92123 | 858-300-5890 |
| San Francisco Investigative Center | 301 Junipero Serra Blvd., Suite 206, San Francisco, CA 94127 | 415-469-6204 |
| Valencia Investigative Center | 25360 Magic Mountain Parkway, Suite 250, Santa Clarita, CA 91355 | 661-219-0066 |
| West Covina Investigative Center | 100 N. Barranca St., Suite 300, West Covina, CA 91791 | 626-332-1317 |
CSLB Email Routing for Licensing, Exams, Bonds and Records
If your issue is detailed, email may be cleaner than a phone call because you can attach context and keep a written record. Use the correct CSLB inbox instead of sending every issue to one general address.
| Question type | CSLB email | Use when |
|---|---|---|
| General licensing or application questions | Licensing@cslb.ca.gov | You need licensing-process direction and are not sure which specialized unit applies. |
| Exams | Exams@cslb.ca.gov | You have a general testing question. |
| Classifications | Classifications@cslb.ca.gov | You need help determining which license classification may fit the work. |
| Contractor bond questions | Bonds@cslb.ca.gov | The question involves contractor license bonds or bond records. |
| Criminal background review | CBU@cslb.ca.gov | CSLB’s Criminal Background Unit asks for information or you have a background-review question. |
| Application exams | AppExams@cslb.ca.gov | Your question is tied to a license application and exam routing. |
| Renewals | Renewals@cslb.ca.gov | You need help with a contractor license renewal question. |
| Workers’ compensation questions | WorkersCompInfo@cslb.ca.gov | The issue involves workers’ compensation information on CSLB records. |
| Public records requests | RecCert1@cslb.ca.gov | You need public record or certification information. |
| General enforcement questions | Enforcement@cslb.ca.gov | The issue involves enforcement and does not fit a specific field office phone route. |
Contractors State License Board California Phone Number FAQs
What is the main Contractors State License Board California phone number?
The main CSLB phone number is 800-321-CSLB, or 800-321-2752. CSLB lists it as the 24-hour licensing and consumer information number.
What number should I call from outside California?
CSLB lists 916-255-3900 for callers outside California.
What are CSLB’s normal phone hours?
CSLB lists hours of operation as Monday through Friday, 8:00 a.m. to 5:00 p.m. Pacific Time, closed holidays.
Can I check a California contractor license by phone?
Yes. CSLB says you can check license status online or by calling 800-321-CSLB. Online lookup is usually better when you want to review classification, status, bond, workers’ compensation and complaint-disclosure information.
What is the official CSLB license lookup page?
The official CSLB lookup is the “Check a Contractor License or Home Improvement Salesperson Registration” page on CSLB’s website.
What number do I call if my online complaint may not have submitted?
CSLB says not to submit a duplicate online complaint. Call 800-321-CSLB during normal business hours and press 324 to verify submission with a complaint-handling agent.
Does CSLB take fee payments over the phone?
No. CSLB’s forms page says fee payments are never requested or accepted over the telephone.
What is CSLB’s headquarters address?
CSLB headquarters is listed at 9821 Business Park Drive, Sacramento, CA 95827. CSLB’s mailing address is P.O. Box 26000, Sacramento, CA 95826.
Who do I contact about unlicensed contractor activity?
CSLB lists SWIFT enforcement contacts for unlicensed activity. Northern SWIFT is 916-255-2924, Central SWIFT is 559-490-0580, and Southern SWIFT is 562-345-7600.
What should I do before calling CSLB about a contractor?
Have the contractor license number, business name, project address, contract, proof of payment, photos and any written messages ready. This makes the call more useful and helps CSLB route the issue.
Final California CSLB Contact Check
For a quick answer, call 800-321-CSLB (2752). For a careful answer, also use the official CSLB license lookup, read the complaint or renewal page that fits your issue, and save every document tied to your project or license file.
The right CSLB number depends on whether you are checking a license, filing a complaint, reporting unlicensed activity, asking about exams, fixing a renewal, or contacting a field office.