The California Contractor License Exam

You cannot book until CSLB accepts your application. At that point CSLB mails a Notice to Schedule an Examination, and you schedule and pay for each test yourself through PSI, either online at PSI's CSLB page or by phone at (877) 392-6422. PSI's current record for both the Law and Business test and the A General Engineering test lists an exam fee of $51.43, charged again for every retake. PSI calls the fee non-refundable and non-transferable.

You can cancel or move an appointment without losing the fee if PSI receives the request two days ahead; for a 9:00 a.m. Monday exam that means before 9:00 a.m. the previous Saturday. A voicemail or email does not count. Missing the appointment, arriving after the start time, or lacking proper ID forfeits the fee.

PSI asks candidates to arrive 30 minutes early with one valid, unexpired government photo ID, such as a U.S. driver's license, state ID card, passport, permanent resident card, military ID or employment authorization card. The name has to match your CSLB application. Candidates are thumbprinted at check-in and again after any break.

Personal calculators, phones, notes, books, watches and bags stay out of the room. CSLB says pencils, scratch paper, calculators and scale rulers are provided on request. A short computer tutorial of up to 15 minutes runs before the clock starts and does not count against your time. One question appears per screen, with the minutes remaining shown at the top.

CSLB allows 3 1/2 hours for each exam, and PSI's record lists 210 minutes. Every study guide describes the test the same way: closed book with no reference materials allowed, multiple choice with four options and one best answer, some questions requiring arithmetic, and a calculator supplied. There is no penalty for guessing, so leave nothing blank. Most trade exams also include questions tied to blueprints or drawing booklets.

CSLB does not publish the number of questions or a fixed passing percentage. Its applicant page says you are told the required percentage at the test site. If you pass, the report says only that you passed. If you fail, you get your overall score and a breakdown by section, which lines up with the section headings in the study guide so you know what to work on.

After a failed attempt you wait 21 calendar days before you can test again, paying PSI a new fee each time. The whole process has a clock: if you have not passed within 18 months after CSLB accepts the application, the application is void and you must reapply with new fees. A test taken within three weeks of the void date is your last chance on that application. CSLB can extend a void date up to 90 days for a documented medical emergency or similar circumstance outside your control.

A passing result holds for five years. If you pass one exam and fail the other, you retake only the one you failed, as long as it is within that window.

Each classification has its own study guide, free on CSLB's site in English and Spanish, listing the sections, their approximate weights and the references the questions are written from. The mix varies a great deal by trade. The B General Building guide splits the test into Planning and Estimating 15 percent, Framing and Structural Components 20 percent, Core Trades 30 percent, Finish Trades 20 percent and Safety 15 percent. The B-2 Residential Remodeling guide has six sections, including Job Site Preparation at 13 percent and Exterior Remodeling at 13 percent.

Safety carries real weight almost everywhere: 18 percent of the A General Engineering exam, 20 percent of C-20 HVAC and 22 percent of C-39 Roofing. Those safety sections draw on Cal/OSHA's Title 8 safety orders, which is why California-specific rules such as roofing fall-protection triggers show up alongside general trade knowledge.

The Law and Business exam is identical for every classification. It covers business organization and licensing, finances, employment, insurance and liens, contracts, public works and safety, with employment and contracts carrying the most weight. It cannot be waived through reciprocity, and even C-61 Limited Specialty applicants, who have no trade exam, must pass it. Our separate California Law and Business guide walks through its seven sections.

The trade exam, by contrast, tests the craft of one classification and can be waived in some cases, including for five-year licensees from California's reciprocal states. In practice many candidates find the two tests call for different study: the trade test rewards field experience, while Law and Business rewards reading the license law and employer guides closely.

Start with the study guide for your classification and rank its sections by weight. Read the listed references for the heaviest sections first, then work timed practice so a 3 1/2-hour closed-book sitting feels routine. ContractorPrepHQ offers practice built for this: original questions written from the CSLB outlines, a diagnostic, drills by topic with explanations, and timed exams with a readiness score, at $99 for Law and Business or $149 for a trade, with California Law and Business included in the trade price.

Keep the security rules in mind. Under Business and Professions Code section 123, copying, sharing or buying exam content is a misdemeanor, and CSLB warns that offenders face automatic failure and a one-year bar from applying.