Administered by Contractors State License Board (CSLB)
The one exam every original applicant sits, whatever the classification. It covers the Contractors State License Law and CSLB's rules, business finances and taxes, employment and payroll law, insurance and the Civil Code lien and payment remedies, home improvement and other contract requirements, public works rules, and Cal/OSHA safety duties.
For the owner, responsible managing officer or responsible managing employee who qualifies a California contractor license through the Contractors State License Board, covering the shared Law and Business exam and the three trade classifications a water, sewer or pipeline contractor most often holds: Class A general engineering, C-34 pipeline and C-42 sanitation system.
A qualifying individual (the owner, a responsible managing officer, member, manager or a responsible managing employee) with at least four years of experience at the journey level, or as a foreman, supervising employee or contractor, in the classification applied for, within the ten years immediately before the application (Business and Professions Code 7068 and 16 CCR 825).
Up to three of the four years may be credited for technical training, apprenticeship training or education, documented as CSLB's regulations require; at least one year must be practical experience.
The experience must be certified by someone in a position to know it firsthand, such as an employer, a licensed contractor the applicant worked under, or a union representative.
The applicant must be at least 18 years old, pass a criminal background check by fingerprint, and, before the license issues, file the contractor's bond and proof of workers' compensation insurance or a valid exemption.
Which exams you sit
An original license applicant sits two exams: Law and Business, which is the same for every classification, and the trade exam for the classification applied for. The Registrar may waive the exams for an applicant who is, or within the past five years was, the qualifying individual on a license in good standing in the same classification, or who passed both exams for that classification within the past five years; CSLB also considers waivers in some family-business cases. A qualifier for a classification added to an existing license must also have passed both exams, so one who has already passed Law and Business normally needs only the new trade exam.
CSLB's Law and Business study guide is effective for exams scheduled on or after December 1, 2021.
How the Law and Business exam is weighted
Content area
% of the exam, approximate
Business Organization and Licensing
13
Business Finances
15
Employment Requirements
20
Insurance and Liens
12
Contract Requirements and Execution
21
Public Works
5
Safety
14
Law and Business exam format
Format: computer-based, closed-book multiple choice with four choices per question at a PSI test center, calculator provided
Time: 3.5 hours per exam
Questions: not published by CSLB; the mock exam in this app uses the app's own practice length and says so
Results: a passing score report shows no score; a failing report shows the overall score, the number answered correctly and a breakdown by section
Pass score: not published; a passing score report does not show the score
Fees: see CSLB's own pages; this site does not print them
Law and Business sample question
Business finances: trade discounts · an original practice item, not a real exam question
A supplier invoices $12,000 of pipe and fittings on terms of 2/10, net 30. The contractor pays on day 8. How much does the early payment save?
$24
$120
$240
$1,200
Answer and working
C. $240
Terms of 2/10, net 30 mean a 2 percent discount if the invoice is paid within 10 days, with the full amount due at 30 days. Paying on day 8 earns the discount: $12,000 × 0.02 = $240. $1,200 reads the 10 in the terms as the discount rate; $120 applies 1 percent; $24 drops a decimal place and applies 0.2 percent.
Law and Business questions answered
What do I need to qualify for the Law and Business exam?
A qualifying individual (the owner, a responsible managing officer, member, manager or a responsible managing employee) with at least four years of experience at the journey level, or as a foreman, supervising employee or contractor, in the classification applied for, within the ten years immediately before the application (Business and Professions Code 7068 and 16 CCR 825). Up to three of the four years may be credited for technical training, apprenticeship training or education, documented as CSLB's regulations require; at least one year must be practical experience. The experience must be certified by someone in a position to know it firsthand, such as an employer, a licensed contractor the applicant worked under, or a union representative. The applicant must be at least 18 years old, pass a criminal background check by fingerprint, and, before the license issues, file the contractor's bond and proof of workers' compensation insurance or a valid exemption.
Do I also have to take the Law and Business exam?
An original license applicant sits two exams: Law and Business, which is the same for every classification, and the trade exam for the classification applied for. The Registrar may waive the exams for an applicant who is, or within the past five years was, the qualifying individual on a license in good standing in the same classification, or who passed both exams for that classification within the past five years; CSLB also considers waivers in some family-business cases. A qualifier for a classification added to an existing license must also have passed both exams, so one who has already passed Law and Business normally needs only the new trade exam.
How is the Law and Business exam weighted?
Business Organization and Licensing 13%; Business Finances 15%; Employment Requirements 20%; Insurance and Liens 12%; Contract Requirements and Execution 21%; Public Works 5%; Safety 14%, per the CSLB study guide effective December 1, 2021. The largest section is Contract Requirements and Execution.
What this exam covers
Law & Business: Business Organization & Licensing
Law & Business: Business Finances
Law & Business: Employment Requirements
Law & Business: Insurance & Liens
Law & Business: Contract Requirements & Execution
Law & Business: Public Works
Law & Business: Safety
How to study for it here
Practice quizzes — filter to any topic above and work through it with explanations.
Flashcards — spaced repetition over terms, formulas and regulations.
Mock exam — a timed run at this grade.
Official formula sheet — a link to the sheet the certifying body publishes for this exam, where it publishes one, so you study from the real thing.
Free, no account, and progress stays in your browser.
Topic coverage follows CSLB examination study guides: Law and Business (effective 1 December 2021), A General Engineering (1 February 2025), C-34 Pipeline (1 November 2023) and C-42 Sanitation System (1 June 2023) (Contractors State License Board).
Practice questions are written to that outline and checked against
the regulations and references it cites;
they are not real exam questions, which are confidential.
Check current application requirements, fees and exam dates on the
certifying body's own page: official certification page.
Questions, flashcards, and explanations are AI-written under a sourcing policy that builds on the exam content outlines and candidate materials each certifying body publishes without restriction and the regulations and technical references they cite, and that excludes actual exam questions, recollections of any exam sat by the author, other study products, and any handbook or document released under a confidentiality agreement. Any item found outside that policy is rewritten from primary sources or removed. Content is then put through repeated review — regulatory values checked against primary sources, every calculation recomputed, and errors corrected — plus spot checks by the author, who holds California water operator certifications and a California civil engineering license. Those spot checks are sampling, not a professional review: nothing here is stamped, sealed, or offered as engineering advice, and not every item has been individually verified, so mistakes can still slip through.
Not affiliated with or endorsed by the State Water Resources Control Board (SWRCB), its Division of Drinking Water (DDW) or Wastewater Operator Certification Program (WWOCP), the California-Nevada American Water Works Association (CA-NV AWWA), the California Water Environment Association (CWEA), the National Council of Examiners for Engineering and Surveying (NCEES), the California Board for Professional Engineers, Land Surveyors, and Geologists (BPELSG), the Contractors State License Board (CSLB), or the American Public Works Association (APWA). All questions, flashcards, and references are independent study aids; verify against the official exam materials.