California contractor law requires a state-issued license for nearly any construction project where labor and materials together exceed $1,000, and it wraps that licensing rule in a web of contract, insurance, payment, and worker-classification requirements that bind both the contractor and the person who hires them.1Contractors State License Board. CSLB Industry Bulletin 24-07 – License Requirement for Minor Work Increases The Contractors State License Board (CSLB) enforces the licensing side. The rest is spread across the Business and Professions Code, the Civil Code, and the Labor Code, and the penalties for getting it wrong range from criminal charges to losing the right to collect a single dollar for finished work.
When a License Is Required
Any person or business performing construction work where the combined cost of labor and materials tops $1,000 must hold a valid CSLB license.1Contractors State License Board. CSLB Industry Bulletin 24-07 – License Requirement for Minor Work Increases A narrow minor-work exemption exists below that threshold, but it applies only when the project needs no building permit of any kind and the person doing the work hires no one to help. If either condition fails, a license is required no matter how small the job.
The CSLB issues licenses in 45 classifications grouped as Class A (general engineering, for work like highways, pipelines, and utility infrastructure), Class B (general building, for structures involving at least two unrelated trades), and Class C (specialty trades such as plumbing, electrical, and roofing).2Contractors State License Board. Get Licensed to Build – A Guide to Becoming a California Licensed Contractor A Class B holder cannot take a single-trade job unless they also hold the relevant specialty license or subcontract that portion to a licensed specialist.3Contractors State License Board. B – General Building Contractor – Licensing Classifications Detail The license number must appear on every contract, advertisement, and business document.
What Unlicensed Work Costs
Working without a license when one is required is a misdemeanor. A first offense can bring up to six months in county jail, a criminal fine of up to $5,000, and an administrative civil penalty between $200 and $15,000 per violation.4Contractors State License Board. Consequences of Contracting Without a License The CSLB sets administrative fines based on the seriousness of the violation and any prior history.5California Legislative Information. California Code Business and Professions Code BPC 7028.7
A licensed contractor who takes work outside the scope of their classification faces a separate penalty scheme. A first violation carries a $1,000 to $3,000 fine and possible license suspension. A subsequent violation raises the fine to $3,000 to $5,000, adds up to one year in jail, and triggers mandatory suspension or revocation proceedings.6California Legislative Information. California Code BPC 7028.1
No License, No Lawsuit
The harshest consequence is civil. Under Business and Professions Code section 7031, a contractor who was unlicensed at any point during a project cannot sue to collect payment for any of the work. Courts apply the rule strictly, treating the deterrence of unlicensed contracting as more important than the apparent unfairness of a customer keeping finished work for free. The homeowner can go further: someone who unknowingly hired an unlicensed contractor may sue for the return of every dollar already paid, with no credit for the value of completed work.
Insurance and the License Bond
California requires every employer to carry workers’ compensation insurance, and construction businesses get no exception.7California Legislative Information. California Code LAB 3700 A contractor with even one employee must either buy coverage from an authorized insurer or hold a certificate of consent to self-insure. Going without exposes the contractor personally to injury claims, opens the door to criminal penalties, and automatically suspends the CSLB license.
The $25,000 contractor license bond the CSLB requires before issuing or renewing a license is not insurance.8Contractors State License Board. Bond Requirements The bond gives consumers a financial backstop if the contractor violates the law or abandons a project, and any amount the surety pays out must be reimbursed by the contractor.9California Legislative Information. California Code BPC 7071.6 Many contractors also carry general liability coverage for third-party property damage and injuries, though required amounts depend on the type and scale of the work.
Home Improvement Contract Requirements
Any residential home improvement project over $500 must be governed by a written contract meeting Business and Professions Code section 7159.10California Legislative Information. California Code BPC 7159 The document must be legible, use at least 10-point type, and use boldface section headings. It has to state the contractor’s license number, the agreed price in dollars and cents, approximate start and completion dates, and a detailed description of the work and materials.
Down Payments and Progress Payments
The maximum down payment a contractor can collect is $1,000 or 10 percent of the total contract price, whichever is less. After that, the contractor cannot request payment that exceeds the value of work already completed or materials already delivered. The contract must set out a schedule of progress payments tied to specific milestones so the homeowner can see what each payment covers. A contractor who furnishes a full performance and payment bond is exempt from these down payment and progress payment restrictions, because the bond itself secures completion.11California Legislative Information. California Code Business and Professions Code 7159.5
Required Notices and the Right to Cancel
Several notices are mandatory. Chief among them is the mechanics lien warning, which tells the homeowner that unpaid subcontractors and suppliers can lien the property even if the general contractor has already been paid in full. The contract must also disclose the contractor’s workers’ compensation and general liability insurance status.
Homeowners get a three-day right to cancel most home improvement contracts. The federal Cooling-Off Rule requires the contractor to hand over two copies of a cancellation form at signing, and the homeowner can cancel for any reason by mailing the form before midnight on the third business day after the contract date.12Federal Trade Commission. Buyer’s Remorse: The FTC’s Cooling-Off Rule May Help Saturdays count as business days; Sundays and federal holidays do not. The right applies when the sale happens at the homeowner’s residence or at a temporary location, not at the contractor’s permanent place of business.
Change Orders
Any addition or change to the original scope of work needs a written change order, signed by both parties, before the new work begins. The change order has to describe what is being added or removed, the dollar adjustment, and any effect on the payment schedule or completion date.10California Legislative Information. California Code BPC 7159 A verbal “just add it while you’re here” is not enforceable against the homeowner, and a contractor who skips the paperwork risks being unable to collect for the extra work.
Mechanics Liens
California’s mechanics lien system gives contractors, subcontractors, and material suppliers a way to secure a financial interest in the property they improved when they are not paid. The steps are strict, and missing one can end the right to lien.
The 20-Day Preliminary Notice
Before recording a lien, filing a stop payment notice, or making a bond claim, a claimant must serve a preliminary notice on the property owner, the direct contractor (if the claimant is a subcontractor or supplier), and any construction lender.13California Legislative Information. California Civil Code 8200 – Preliminary Notice The notice must be served within 20 days of first providing labor or materials. A late notice does not eliminate lien rights entirely, but it does limit them to work performed within the 20 days before the notice actually went out, plus anything done after. Everything earlier is lost.14California Legislative Information. California Civil Code 8204
Recording and the 90-Day Deadline
If payment does not arrive, the claimant records a mechanics lien against the property. From the date of recording, the claimant has exactly 90 days to file a lawsuit to enforce the lien. If no suit is filed inside that window, the lien expires by operation of law and becomes unenforceable.15California Legislative Information. California Civil Code 8460 The only exception is when the claimant and owner agree in writing to extend credit and record notice of those terms within the 90-day period. Property owners should know that an expired lien does not automatically vanish from county records; if the claimant does not release it, the owner may need a court order to clear title.16Contractors State License Board. What if a Mechanics Lien is Filed on Your Property
Employee or Independent Contractor
California presumes workers are employees. Under the ABC test drawn from the state Supreme Court’s Dynamex decision and codified in Assembly Bill 5, a hiring entity must prove all three of the following to treat a worker as an independent contractor: the worker is free from control and direction over how the work is performed; the worker performs tasks outside the usual course of the hiring entity’s business; and the worker is customarily engaged in an independently established trade or business of the same nature.17California Department of Industrial Relations. FAQ – Independent Contractor versus Employee Fail one prong and the worker is an employee for the Labor Code, unemployment insurance, and wage orders. Misclassification exposes the hiring entity to back wages, tax penalties, and lawsuits.
The Construction Subcontractor Exemption
Construction has a specific carve-out. When a licensed contractor hires a subcontractor who meets a defined list of criteria, the relationship is evaluated under the older Borello multi-factor test instead of the ABC test.18California Legislative Information. California Code Labor Code LAB 2781 Every one of the following must be true: the subcontract is in writing; the subcontractor holds a valid CSLB license and the work falls within its scope; the subcontractor maintains a business location separate from the contractor’s; the subcontractor has authority to hire and fire workers on the project; the subcontractor bears financial responsibility for errors through insurance, bonds, or warranties; the subcontractor is customarily engaged in an independently established business of the same type; and, where local rules require it, the subcontractor holds a business license or tax registration.
A subcontractor who works only for one general, operates out of that general’s office, or lacks their own insurance will fail the exemption and default back to the ABC test, where employee status is nearly certain.
Filing a Complaint With the CSLB
Consumers who believe a contractor violated licensing law can file a complaint with the CSLB online or by mail. The board investigates both licensed and unlicensed individuals for up to four years after the act.19Contractors State License Board. Filing a Construction Complaint Investigations can produce license suspension, revocation, or administrative penalties.
One boundary worth knowing: the CSLB exists to enforce the licensing law, not to recover money for the consumer. A successful complaint may discipline the contractor without producing a dime of restitution. To recover funds, you generally have to go through the courts, including small claims for smaller amounts.19Contractors State License Board. Filing a Construction Complaint The CSLB does have authority to suspend a contractor’s license for failing to pay a final court judgment connected to construction work, which gives a judgment real leverage once you have one in hand.