The CSLB Law and Business exam, explained
Seven sections, four answer choices, three and a half hours, and no book to look anything up in. Here is exactly what you are walking into.
Almost everyone applying for a California contractor licence has to pass two exams: the Law and Business exam and a trade exam for the classification they applied for. The only exception CSLB names is the C‑61 Limited Specialty classification, which has no trade exam.
The Law and Business exam is the one that catches people out. The trade knowledge you already have — that is why you qualified in the first place. This exam asks about lien deadlines, payroll deposits, contract clauses and depreciation, and it asks with the book closed.
The format, in plain terms
| Delivery | On a computer at a PSI test centre, with an on-screen tutorial first |
|---|---|
| Question type | Multiple choice, four choices, one BEST answer |
| Time | 3½ hours for each exam |
| Books | Closed book. No reference materials allowed |
| Maths | Some questions need calculation. A calculator is provided — you may not bring your own |
| Guessing | No penalty. Never leave a question blank |
| Languages | English or Spanish |
Sources: CSLB Law and Business Examination Study Guide; CSLB Examinations FAQ.
The calculator detail matters more than it sounds. Personal calculators are on PSI's list of prohibited items, along with phones, notes, food and drink. You get the one on screen. If you have been practising markup and payroll maths on paper, practise them the way you will actually do them on the day.
The seven sections and what they weigh
CSLB publishes the content outline and roughly how much of the exam each section is worth. The percentages are approximate, but they tell you where your study hours belong.
| Section | Weight |
|---|---|
| Contract Requirements and Execution Bidding, cost control, project organisation, contracts, payments | 21% |
| Employment Requirements Hiring, supervising and training, evaluation and record-keeping, payroll | 20% |
| Business Finances Cash management, budget and planning, taxes, financial reporting | 15% |
| Safety Training and reporting, general safety, hazardous and unknown materials | 14% |
| Business Organization and Licensing Company organisation, licensing requirements, advertising and subcontracting | 13% |
| Insurance and Liens Workers' compensation, business insurance, liens and other remedies | 12% |
| Public Works Prevailing wage, bonding requirements, insurance requirements | 5% |
Weights from the CSLB Law and Business Examination Study Guide (for exams scheduled on or after 1 December 2021). CSLB notes the percentages are approximate.
Read that table as a budget. Contracts and Employment together are 41% of the exam — nearly half of it. Public Works is 5%: worth knowing, not worth a weekend. Most people who fail have spread their time evenly instead of proportionally.
What score do you need?
This is the most-asked question about the exam, and the honest answer is that nobody outside CSLB knows. CSLB's own licensing booklet says the applicant can ask CSLB about the percentage needed to pass, because it varies for each exam. Any site quoting you a firm pass mark is guessing.
What CSLB does tell you about results:
- You get a printed report before you leave the test centre.
- A passing report tells you that you passed — it does not show your score.
- A failing report shows your overall score and how many questions you answered correctly in each section.
- Results go only to you and CSLB, and never over the phone.
That failing report is more useful than it feels at the time. Its sections line up exactly with the seven above, so it tells you precisely what to fix before you rebook. See what to do after a failed exam.
Taking it in Spanish
CSLB offers Spanish versions of ten commonly taken exams, including Law and Business, B – General Building, C‑8 Concrete, C‑9 Drywall, C‑15 Flooring, C‑27 Landscaping, C‑33 Painting, C‑36 Plumbing, C‑39 Roofing and C‑54 Tile. If you ask for a translator for one of those exams, you are required to take the Spanish version rather than bring someone in with you.
One practical warning: the law itself is written in English, and the terms on the exam are translations of English legal terms. You can know a rule perfectly in Spanish and still not recognise it under its English name. Learn both labels for the same rule. That is why our questions show the English term beside the Spanish one the first time it appears. Full detail on the process in taking the exam in Spanish.
How to prepare for it
CSLB's advice is to read the current California Contractors License Law & Reference Book, which is free on its website, and to use the official study guide for the topic list. That is the right source material. It is also several hundred pages, and the exam is closed book, so reading is not the same thing as being ready.
What actually moves the needle:
- Find your weak sections first. Do not start at page one. Take a scored practice test, see which of the seven sections you are worst at, and start there.
- Practise the maths by hand. Markup versus margin, payroll deposits, lien deadlines counted in calendar days. People lose these points for being slow, not for not knowing.
- Learn the numbers as numbers. Down payment caps, notice deadlines, dollar thresholds. Flashcards beat re-reading.
- Sit at least one full timed mock. Three and a half hours of concentration is its own skill.
About anyone selling you "the real exam questions". CSLB does not release test questions or answer keys, and they are not available for review after the exam. Anything sold as the actual bank is either invented or obtained in a way that will not end well for the buyer. What legitimate preparation does is teach the same rules the exam is built from.
Common questions
How long is the exam?
Three and a half hours for each exam. If you sit the Law and Business exam and a trade exam on the same day, each one gets its own 3½ hours.
How many questions are on it?
CSLB publishes the section weights but not a fixed question count, and exams are revised over time. Plan around the weights and the time limit rather than around a number.
Can I take it outside California?
The Law exam is offered at PSI centres in a number of other states, including Texas, New York, Illinois and Oregon. Trade exams can only be taken in California or Oregon.
What do I bring?
One valid, non-expired government photo ID, and the name on it has to match the name on your application. Arrive 30 minutes early. Leave your phone, notes, calculator, food and drink outside.
Is this the same as a licence in another state?
No. This is California's own exam, administered for CSLB by PSI. Other states use their own exams or the NASCLA exam.
Last reviewed 16 September 2026 against the CSLB Law and Business Examination Study Guide, the CSLB Examinations FAQ and Get Licensed to Build. Rules change; check cslb.ca.gov before acting on anything here. This page is study guidance, not legal advice, and we are not affiliated with CSLB or PSI.