California Contractor Board Complaint 2026: File Online Help explains how homeowners, seniors, subcontractors, employees, other contractors and public agencies can file a Contractors State License Board California complaint, choose the correct CSLB complaint form, prepare evidence, report unlicensed activity, check a contractor license, understand mediation, arbitration, bond claims, small claims court, complaint status, and what happens after a construction complaint is submitted.
File a California Contractor Complaint: CSLB Online Form, Evidence, Status & Next Steps
If a California contractor abandoned a project, performed poor workmanship, violated a home improvement contract, failed to pay a subcontractor or supplier, advertised without a license, skipped a building permit, used misleading ads, or took too much money up front, the California Contractors State License Board complaint route may be the correct first step.
This guide covers the online CSLB construction complaint form, mail filing, licensed contractor complaints, unlicensed contractor reports, active job-site referrals, solar complaints, building permit complaints, complaint status calls, evidence packets, mediation, arbitration, small claims court, license bond claims and senior-friendly safety warnings in plain English.
Independent guide: ContractorsBoard.org is not the California Contractors State License Board, Department of Consumer Affairs, California courts, a law firm, or the contractor’s bond company. Always verify current complaint forms, deadlines, license status, complaint status, bond information, small claims rules, arbitration limits, payment laws and addresses directly with CSLB or the appropriate court before filing.
California State Contractors License Board complaint quick answer
To file a California contractor complaint, start at CSLB’s official “File a Complaint” page and choose the correct form for your situation. The main construction complaint form can be used by homeowners, other contractors, subcontractors and employees. Public agencies may also file complaints.
CSLB says the online complaint form generates a PDF and instructions for final submission. Do not assume the online step alone finishes your complaint. Review the final instructions carefully, sign where required, and submit copies of support documents exactly as CSLB instructs.
Official CSLB complaint pages to use in 2026
California contractor complaint searches can lead to many private websites, but the final filing action should be done through CSLB or the correct court. Use CSLB for construction complaints, unlicensed activity, active job-site referrals, solar complaints, advertising complaints, building permit complaints and license lookup.
Main construction complaint
Use for poor workmanship, abandonment, contract violations, failure to pay subcontractors, code issues and similar contractor conduct problems.
Unlicensed activity report
Use for an unlicensed person contracting, active jobsite concerns, illegal advertising, or a person using someone else’s license number.
Building permit complaint
Use when the issue is that the contractor failed to pull a required building permit for active construction activity.
File a CSLB complaint online: what the California form does and does not do
The online California contractor complaint form helps you create a temporary construction complaint and generate a PDF with instructions. CSLB says online complaints can generally be submitted any time except Sunday 7:30 p.m. to Monday 6 a.m. Pacific Time. After you complete the online steps, read the final PDF instructions so your signed complaint and support documents are properly submitted.
Step 1
Open the official online construction complaint form and review the notice.
Step 2
Enter contractor, project, contract, payment, jobsite and allegation details carefully.
Step 3
Save or print the generated PDF and follow final submission instructions.
Step 4
Send copies of proof, keep originals, and save a full copy for your records.
California contractor complaint helper tools
These tools help organize your complaint before you use CSLB’s official forms. They do not file anything for you and do not replace CSLB, a court, a lawyer, a bond company, your local building department, or a county district attorney.
Tool 1: Complaint route finder
Your complaint route will appear here
Select your issue and the guide will point you toward the most useful CSLB path.
Tool 2: Evidence strength checker
Evidence result will appear here
CSLB can move faster when your documents are organized and easy to read.
Tool 3: Deadline and urgency checker
Urgency result will appear here
CSLB prioritizes serious health, safety and significant financial injury issues.
Tool 4: Complaint summary cleaner
Clean summary will appear here
Use a short factual summary. Avoid insults. Dates, money, documents and photos are stronger than emotion.
Before filing a CSLB complaint: notify the contractor and save proof
CSLB may ask whether you formally notified the contractor about your concerns. A clear written notice can help because it shows the contractor had a chance to resolve the issue before the complaint moved forward. Keep a copy of your letter, email or message and submit a copy with your complaint when relevant.
Good written notice includes
- Project address and contractor name.
- Contract date and agreed scope.
- What went wrong, with dates.
- What you want repaired or returned.
- A reasonable response deadline.
- Your phone, email and mailing address.
Do not send originals
When filing by mail, CSLB says to send the complaint form and paper copies of support documents. Keep originals, photos, permit records, invoices, payment receipts and messages in your own file.
What to attach to a California contractor complaint
Your complaint should be easy for CSLB intake staff to understand. Put your documents in order, use copies, write a short timeline, and label photos by date. If you have too many screenshots, choose the most important ones and keep the rest available.
| Document | Why CSLB may need it | Filing tip |
|---|---|---|
| Contract, estimate, proposal or invoice | Shows the agreed work, price, contractor name, license number and project scope. | Circle or highlight the license number, business name, scope and payment terms. |
| Payment proof | Shows deposit, progress payments, financing, checks, credit card charges or cash receipts. | List each payment by date, amount, method and who received it. |
| Photos and videos | Shows defective work, abandonment, damage, unsafe conditions or unfinished work. | Use dated photos and explain what each photo shows. |
| Messages and emails | Shows promises, delay excuses, change orders, refusal to repair or contractor response. | Keep the most important messages and full conversation backup. |
| Permit and inspection records | Shows whether required permits were pulled and whether work passed inspection. | Ask your city or county building department for permit history. |
| License check screenshot | Shows what you found when you checked the license, HIS registration, bond or workers’ comp. | Save the date of lookup and compare the business name to the contract. |
Complaint against a licensed California contractor: workmanship, abandonment, payment or code violation
CSLB complaint jurisdiction commonly involves a licensed contractor failing to fulfill the terms of an agreement. Examples include poor workmanship, abandonment of the project, failure to pay subcontractors, material suppliers or employees, building code violations, lack of reasonable diligence, misleading advertising and home improvement contract violations.
Poor workmanship
Use photos, inspection notes, expert estimates, project scope and code references when available.
Project abandonment
Show last work date, messages, payment records, unfinished work and attempts to contact the contractor.
Contract violations
Attach the contract, change orders, payment schedule, down payment proof and any promises made in writing.
Restitution warning: CSLB may try to help resolve complaints, but it does not guarantee you will get money back. If your main goal is financial recovery, you may also need small claims court, a bond claim, civil court or legal advice.
Report unlicensed contractor activity in California
CSLB investigates unlicensed contracting activity, but the remedy is different from a complaint against a licensed contractor. CSLB may issue a warning letter or citation, refer the matter to a local district attorney, or take other enforcement action, but it cannot always force an unlicensed person to repair your project or pay restitution.
| Unlicensed issue | Best CSLB route | What to save |
|---|---|---|
| Active unlicensed jobsite | SWIFT lead referral or active project complaint route. | Jobsite address, vehicle, photos, worker names, ad, phone and license-number claims. |
| Illegal advertising | Advertising complaint form for unlicensed contractor ads. | Current ad, screenshot, publication date, URL, phone number and business name. |
| Using someone else’s license | Report unlicensed activity and attach license misuse evidence. | Ad, contract, texts, business card and official license check screenshot. |
| Work over licensing threshold | Use CSLB complaint or unlicensed activity route. | Contract total, labor/material amount, payment proof and project scope. |
California solar, roof, ADU and home improvement complaint issues
Solar, roofing, battery, ADU and home improvement projects often involve financing, salespeople, subcontractors, permits, inspections, change orders and payment rules. Before filing, check the contractor license, Home Improvement Salesperson registration if a salesperson was involved, permit status and every payment or financing document.
Payment reminder: CSLB warns that home improvement down payments are limited to $1,000 or 10 percent of the contract price, whichever is less. Progress payments should not exceed the value of work performed or material delivered.
Solar complaint
Attach proposal, financing documents, interconnection paperwork, permit status, panel/inverter details and payment history.
ADU or remodel
Attach plans, permits, inspections, change orders, payment schedule, photos and project timeline.
Roof or disaster repair
Attach emergency photos, roof leak proof, insurance estimate, contractor estimate, permit history and payment details.
File a California contractor complaint by mail
If you prefer paper filing, CSLB says to download the Construction Complaint form or call 800-321-CSLB to request that a complaint form be mailed to you. Fill out and sign the form, print copies of support documents, and mail the complaint based on the county where the construction project is located.
| Project county | CSLB mail route | Important note |
|---|---|---|
| Imperial, Los Angeles, Orange, Riverside, San Diego, Ventura | Norwalk Intake Mediation Center, 12501 East Imperial Highway, Suite 620, Norwalk, CA 90650 | Send copies only, not originals, flash drives, CDs or DVDs. |
| All other California counties | Sacramento Intake Mediation Center, P.O. Box 269116, Sacramento, CA 95826-9116 | Use the current official instructions before mailing. |
What happens after you file a CSLB complaint?
CSLB first reviews whether the complaint is within its jurisdiction. CSLB generally has jurisdiction up to four years from the violation date, and up to ten years for some hidden structural defects. Then CSLB may send contact letters, request more documents, attempt mediation, prioritize serious cases, refer to arbitration, transfer to investigation, issue a citation or close the file depending on evidence and law.
| Stage | What CSLB may do | What you should do |
|---|---|---|
| Jurisdiction review | Check whether the complaint is within CSLB’s authority and time limits. | Provide dates, license number, project address and clear allegations. |
| Contact letters | Contact both you and the contractor and encourage resolution. | Respond quickly and keep all settlement offers in writing. |
| Mediation | Ask for more documents and attempt to mediate the dispute. | Be factual, organized and realistic about what will resolve the dispute. |
| Investigation | Refer to an investigative center if evidence suggests a violation. | Provide witness details, photos, permits, expert estimates and inspection records. |
| Citation or accusation | Issue penalties, correction orders, restitution orders, or pursue discipline. | Track notices and keep records for possible court or bond action. |
CSLB complaint vs small claims court, bond claim and civil action
A CSLB complaint can help with mediation, investigation and discipline, but it is not the same as a guaranteed refund. If your primary goal is recovering money, you may need small claims court, a contractor license bond claim, civil court, insurance claim or legal advice. CSLB may provide information about small claims or bond options in certain cases.
CSLB complaint
Best for reporting contractor law violations, mediation, investigation, discipline and correction issues.
Small claims court
Best when your main goal is money damages within small claims limits and you can prove the loss.
License bond claim
Best when you have a claim against a licensed contractor’s bond and must meet surety company deadlines.
Time-sensitive note: Surety bond claims, court filings and hidden-defect issues can have deadlines. Do not wait for months if the loss is large, safety is involved, or the contractor has disappeared.
CSLB arbitration: mandatory and voluntary dispute routes
CSLB administers arbitration programs for qualifying disputes. CSLB explains that mandatory arbitration may apply to disputes involving alleged damages of $25,000 or less, while voluntary arbitration may apply to alleged damages between $25,000 and $50,000 when both sides are willing and the complaint meets strict criteria.
Mandatory arbitration
Potential route for qualifying disputes at or below the CSLB mandatory arbitration damage threshold.
Voluntary arbitration
Potential route for qualifying higher-value disputes when both parties are willing to use arbitration.
Dealing with a CSLB complaint filed against your license
Contractors should take a CSLB complaint seriously. CSLB may send contact letters, request documents, attempt mediation, transfer the matter to investigation, refer to arbitration, issue an advisory letter, letter of admonishment, citation, accusation, criminal referral or injunction petition depending on the facts.
Respond early
Ignoring contact letters can make the complaint harder to resolve and may increase enforcement risk.
Organize records
Prepare contract, change orders, photos, permit history, payment records, subcontractor proof and messages.
Fix if appropriate
Early repair, refund, completion or settlement can be easier than late-stage investigation or discipline.
CSLB complaint status: what to do if you are not sure the online complaint submitted
If you completed the online form but are not sure whether it submitted successfully, do not submit a duplicate complaint. CSLB says duplicate complaints can delay the process. Call 800-321-CSLB during normal business hours and follow the complaint-handling prompt instructions to verify submission.
Simple phone script: “I completed a CSLB online construction complaint and want to confirm whether it was successfully received. I have the contractor name, project address, my name, filing date and generated PDF details.”
California senior, wildfire, storm, solar and door-to-door contractor scam warning
Seniors and homeowners rebuilding after fires, storms or emergency repairs are often targeted by unlicensed or dishonest operators. Be cautious with door-to-door offers, pressure to sign immediately, requests for large upfront payments, financing documents you do not understand, or a contractor who refuses to provide a license number and written contract.
Do not rush
Take a day to check the license, read the contract, verify permits and ask family or a trusted person for help.
Watch the deposit
Home improvement down payments are limited, and extra progress payments should match actual work or materials delivered.
Save everything
Keep cards, ads, text messages, calls, receipts, photos, bank proof, license search screenshots and permit notes.
CSLB complaint contact, offices and map
CSLB lists 800-321-CSLB (2752) for 24-hour licensing and consumer information and 916-255-3900 for callers outside California. Headquarters is listed at 9821 Business Park Drive, Sacramento, CA 95827, with a mailing address of P.O. Box 26000, Sacramento, CA 95826. The Southern California office is listed at 12501 East Imperial Highway, Suite 600, Norwalk, CA 90650.
CSLB video: how to file a contractor complaint
Watch the CSLB complaint video before you start if you want a visual walkthrough. After watching, prepare your evidence packet and use the official CSLB complaint form or correct unlicensed activity route.
Helpful ContractorsBoard.org guides for California complaint users
Complaint filing is only one part of contractor protection. You may also need to verify a license, compare state contractor board rules, check a different state, or understand how contractor license directories work before hiring or filing.
All 50-state contractor board directory
Use this if your contractor is from another state or the project is outside California.
Contractors State License Board guide
Compare state board names, lookup routes, application routes and complaint routing by state.
Contractor license check guide
Learn how to verify license status, match business names and avoid fake license claims.
Official California CSLB complaint links
Use these official links for final action. This page helps you understand the complaint workflow, but CSLB controls forms, deadlines, license records, complaint handling, enforcement decisions, arbitration criteria and official contact details.
Complaint center
Official hub for complaint forms, solar complaints, active project referrals and permit complaints.
Complaint by mail
Official mailing instructions and county routing for complaint packets.
After you file
Official explanation of jurisdiction, contact letters, mediation, investigation and discipline.
Report unlicensed activity
Official route for unlicensed contractors, active jobsites and illegal advertising.
Check license
Verify contractor license, Home Improvement Salesperson registration and license details.
California Contractor Board complaint FAQs
How do I file a complaint with the California Contractors State License Board?
Use CSLB’s official “File a Complaint” page or online Construction Complaint form. Complete the form carefully, save the generated PDF, sign where required, and submit copies of support documents according to CSLB’s instructions.
Can I file a CSLB complaint online?
Yes. CSLB provides an online construction complaint form process. The online form generates a PDF and instructions for final submission, so read the final instructions carefully and do not assume the complaint is complete until required signed paperwork and support documents are submitted.
Who can file a complaint against a California contractor?
Homeowners, other contractors, subcontractors, employees and public agencies may file CSLB complaints when the issue falls within CSLB’s jurisdiction.
What complaints does CSLB handle?
CSLB complaint issues may include poor workmanship, project abandonment, failure to pay subcontractors or suppliers, building code violations, lack of reasonable diligence, misleading advertising, home improvement contract violations and unlicensed contracting activity.
How long do I have to file a CSLB complaint?
CSLB explains that it generally has jurisdiction for up to four years from the date of violation and up to ten years for some hidden structural defects. Because deadlines can be fact-specific, do not delay filing or seeking legal advice when the loss is serious.
Can CSLB force an unlicensed contractor to fix my project?
CSLB has limited authority over unlicensed persons. It may cite, fine or refer a case for prosecution, but it may not be able to require an unlicensed person to repair your project or pay restitution.
Will CSLB get my money back?
CSLB may attempt mediation, investigation or disciplinary action, but it does not guarantee restitution. If your main goal is money recovery, review small claims court, bond claim and civil action options.
What happens after I file a CSLB complaint?
CSLB reviews jurisdiction, may send contact letters, request more information, attempt mediation, prioritize serious cases, refer to arbitration, send the case to investigation, issue a citation or accusation, or close the complaint depending on evidence and law.
How do I check CSLB complaint status?
If you are unsure whether an online complaint was submitted, CSLB says not to submit a duplicate. Call 800-321-CSLB during normal business hours and ask a complaint-handling agent to verify submission.
Should I send original documents to CSLB?
No. For mail filing, CSLB instructs complainants to send paper copies of support documents and not send originals, flash drives, CDs or DVDs. Keep originals in your own file.
Final recommendation for filing a California contractor complaint
Start by checking the contractor license, then choose the correct CSLB complaint route. Build a simple evidence packet with your contract, payment proof, photos, messages, permit records and timeline. Use the official online form or mail instructions, keep copies of everything, and remember that a CSLB complaint can help with enforcement and resolution, but money recovery may also require a bond claim, small claims court, civil action or legal advice.