Under California contractor law, almost any construction project with combined labor and materials over $1,000 must be performed by someone holding a license from the Contractors State License Board (CSLB), and the same body of law dictates how contracts are written, how much a contractor can collect up front, how unpaid workers and suppliers secure their claims, and what happens when any of these rules are broken.1Contractors State License Board. CSLB Industry Bulletin 24-07 – License Requirement for Minor Work Increases The system puts obligations on both the contractor and the homeowner, and the penalties for ignoring it reach well beyond fines.
When a License Is Required
The $1,000 threshold combines labor and materials for the whole project, not just one portion. A narrow exemption lets a person do minor work below that amount without a license, but only if the project needs no building permit of any kind and no one is hired to help.1Contractors State License Board. CSLB Industry Bulletin 24-07 – License Requirement for Minor Work Increases If either condition fails, a license is required at any dollar amount.
Licenses come in three categories.2Contractors State License Board. Get Licensed to Build – A Guide to Becoming a California Licensed Contractor Class A covers general engineering work such as highways, pipelines, and utility infrastructure. Class B is the general building license and applies when a project involves at least two unrelated building trades; a Class B holder cannot take a single-trade job unless they also hold the matching specialty license or subcontract that part to someone who does.3Contractors State License Board. B – General Building Contractor – Licensing Classifications Detail Class C licenses are specialty trades like plumbing, electrical, and roofing.
Every licensee must display the license number on contracts, advertisements, and business documents, and must post a $25,000 surety bond with the CSLB before a license will issue or renew.4Contractors State License Board. Bond Requirements
Penalties for Unlicensed or Out-of-Scope Work
Contracting 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.5Contractors State License Board. Consequences of Contracting Without a License The CSLB sets the administrative amount based on the seriousness of the conduct and any prior history.6California Legislative Information. California Code Business and Professions Code BPC 7028.7
A licensee who works outside the scope of their classification faces a separate penalty track. A first offense carries a fine of $1,000 to $3,000 and possible suspension. A later violation runs $3,000 to $5,000, up to a year in jail, and mandatory suspension or revocation proceedings.7California Legislative Information. California Code BPC 7028.1
No License, No Payment
The harshest consequence is civil. Business and Professions Code section 7031 bars a contractor who was unlicensed at any point during a project from suing to collect payment for any of the work. Courts apply this strictly. The homeowner can also go on offense: a property owner who unknowingly hired an unlicensed contractor can sue to recover every dollar paid, with no offset for the value of work completed.
Insurance and Bond Requirements
Any contractor with employees must carry workers’ compensation insurance from an authorized insurer or hold a certificate of consent to self-insure.8California Legislative Information. California Code LAB 3700 Operating without coverage exposes the contractor to personal liability for workplace injuries, criminal penalties, and automatic suspension of the CSLB license.
The $25,000 license bond is not insurance. It guarantees a financial backstop for consumers when a contractor violates the law or abandons a job, and the contractor must reimburse the surety for any claim paid.9California Legislative Information. California Code BPC 7071.6 General liability insurance is separate; many contractors carry it to cover property damage or injuries to third parties, with minimums that vary by work type.
Rules for Home Improvement Contracts
Residential home improvement work over $500 must be documented in a written contract that complies with Business and Professions Code section 7159.10California Legislative Information. California Code BPC 7159 The contract must be legible, use at least 10-point type, and use boldface headings. It must state the contractor’s license number, the price in dollars and cents, approximate start and completion dates, and a detailed description of the work and materials.
The contract must also carry a mechanics lien warning telling the homeowner that unpaid subcontractors and suppliers can lien the property even after the homeowner pays the general contractor, and it must disclose the contractor’s workers’ compensation and general liability coverage.
Down Payments, Progress Payments, and Change Orders
The maximum down payment is $1,000 or 10 percent of the contract price, whichever is less. After that, the contractor cannot request payment that exceeds the value of work already completed or materials already delivered, and the contract must schedule progress payments tied to specific milestones. A contractor who furnishes a full performance and payment bond is not bound by these down payment and progress payment restrictions, because the bond itself guarantees completion.11California Legislative Information. California Code Business and Professions Code 7159.5
Changes to the original scope require a written change order signed by both parties before the extra work begins. It must describe what is being added or removed, the dollar adjustment, and the effect on the payment schedule or completion date.10California Legislative Information. California Code BPC 7159 A verbal “while you’re here” agreement is not enforceable, and a contractor who skips the paperwork may lose the right to collect for the added work.
Three-Day Right to Cancel
Homeowners can cancel most home improvement contracts within three business days under the federal Cooling-Off Rule. The contractor must 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; Sundays and federal holidays do not. The rule applies when the sale happens at the homeowner’s residence or a temporary location, not at the contractor’s permanent office.
Mechanics Liens
Mechanics liens let contractors, subcontractors, and material suppliers secure a financial interest in the property they improved when they are not paid. The procedure is strict, and a missed step can end the right to lien.
Preliminary Notice
Before recording a lien, filing a stop payment notice, or claiming against a payment bond, the 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 Service must happen within 20 days of first providing labor or materials.14California Legislative Information. California Civil Code 8204
A late notice does not wipe out lien rights entirely, but it limits them to work performed within 20 days before the notice was actually served and anything done after. Everything earlier is lost.14California Legislative Information. California Civil Code 8204
Recording and the 90-Day Deadline
If payment never comes, the claimant records a mechanics lien against the property, then has exactly 90 days to file a lawsuit to enforce it. Miss that window and the lien expires by operation of law.15California Legislative Information. California Civil Code 8460 The only exception is a written credit agreement between the claimant and owner, with notice of those terms recorded within the 90-day period. An expired lien does not automatically clear from county records, so an owner may have to petition the court for a release if the claimant will not remove it.16Contractors State License Board. What if a Mechanics Lien is Filed on Your Property
Classifying Workers: The ABC Test
California presumes workers are employees. Under the ABC test, codified by Assembly Bill 5 from the state Supreme Court’s Dynamex decision, a hiring entity must prove all three of the following to treat a worker as an independent contractor:17California Department of Industrial Relations. FAQ – Independent Contractor versus Employee
- Prong A: the worker is free from the hiring entity’s control and direction over how the work is performed.
- Prong B: the worker performs tasks outside the usual course of the hiring entity’s business.
- Prong C: the worker is customarily engaged in an independently established trade or business of the same nature.
Fail any prong and the worker is an employee for Labor Code, unemployment insurance, and wage order purposes. Misclassification exposes the hiring entity to back wages, tax penalties, and lawsuits.
Construction Subcontractor Exemption
Construction has its own carve-out. When a contractor hires a subcontractor who meets a list of qualifying criteria, the relationship is judged under the older Borello multi-factor test instead.18California Legislative Information. California Code Labor Code LAB 2781 All of the following must be true:
- The subcontract is in writing.
- The subcontractor holds a valid CSLB license and the work falls within that license’s scope.
- The subcontractor maintains a business location separate from the contractor’s.
- The subcontractor can hire and fire workers on the project.
- The subcontractor assumes financial responsibility for errors through insurance, bonds, or warranties.
- The subcontractor is customarily engaged in an independently established business of the same type.
- If the subcontractor’s jurisdiction requires a business license or tax registration, the subcontractor has one.
Every box must be checked. A subcontractor who works only for one general, operates out of the general’s office, or lacks their own insurance will fail the exemption and fall back under the ABC test, where employee status is almost certain.
Lead-Safe Work on Pre-1978 Buildings
Renovation, repair, or painting on buildings built before 1978 triggers extra rules. The EPA’s Renovation, Repair, and Painting (RRP) rule requires a certified renovator on site and firm certification for any project disturbing more than six square feet of interior painted surface or 20 square feet of exterior painted surface in a pre-1978 home. California goes further by presuming all painted surfaces in pre-1978 buildings contain lead-based paint; only a state-certified lead inspector or risk assessor can test to rebut that presumption. Violations of the federal RRP rule carry fines of up to $41,056 per incident.
Filing a Complaint With the CSLB
A consumer who believes a contractor broke California licensing law can file a complaint online or by mail. The CSLB investigates violations by licensees and unlicensed operators for up to four years after the act.19Contractors State License Board. Filing a Construction Complaint Outcomes include suspension, revocation, and administrative penalties.
One boundary is worth knowing before you file. The CSLB enforces the law; it does not act as a collection agency for homeowners. A successful complaint can discipline the contractor but will not by itself return the money. To recover funds, consumers use the courts, including small claims for smaller amounts.19Contractors State License Board. Filing a Construction Complaint Once a judgment is obtained, the CSLB can suspend the contractor’s license for failure to pay it, which often becomes the practical leverage that moves a settlement.