A study plan for the B exam, in two weeks or four
CSLB tells you what each part of the B exam is worth. Core Trades alone is 30%. This plan spends your hours the same way.
CSLB has no official study schedule. It does publish the five sections of the B exam and roughly what share of it each one carries. Those shares are the plan. The hours below are ours: about 24 hours over two weeks or 40 hours over four, for someone who works days and studies evenings plus a longer weekend block. More time? Scale everything up; the proportions are the point.
Step 1: turn the weights into hours
| Section (weight) | 2 weeks | 4 weeks |
|---|---|---|
| Core Trades · 30% | 4½ h | 7½ h |
| Framing and Structural Components · 20% | 3 h | 5 h |
| Finish Trades · 20% | 3 h | 5 h |
| Planning and Estimating · 15% | 2½ h | 4 h |
| Safety · 15% | 2½ h | 4 h |
| Estimating math drills | 2 h | 3½ h |
| Full timed practice exams (3½ h each) | 1 · 3½ h | 2 · 7 h |
| Reviewing mistakes and numbers | 3 h | 4 h |
| Total | 24 h | 40 h |
Weights from the CSLB General Building (B) study guide, 13E-B (03-2026). CSLB notes the percentages are approximate. Hours are ours.
Math gets its own line because it cuts across sections: estimating is in Planning and Estimating, but concrete yards, rafter lengths, grades and traffic tapers turn up in Core Trades, Framing and Safety too. The study guide says some questions require computation and a calculator is provided.
Step 2: find out where you stand
Take a scored test before anything else. Our free B test is 25 questions, about 15 minutes, with a score for each of the five sections. Then move hours: take an hour from any section you are clearly strong in and give it to your weakest heavy one. Weak in Safety costs you less than weak in Core Trades. Five questions a section is a hint, not a verdict, so do not drop a section entirely on the strength of it.
Step 3: know where the answers live
The study guide lists the references the exam is built from. Here is roughly which one answers which section — our reading of the list, not CSLB's:
| Section | Where the rules come from |
|---|---|
| Planning and Estimating | California Building and Residential Codes (permits, plans, inspections), the construction textbooks for estimating |
| Framing and Structural | California Residential Code (wood framing, foundation anchorage, stairs, guards, exterior coverings), Modern Carpentry |
| Core Trades | California Plumbing, Electrical, Mechanical and Energy Codes, the Residential Code for foundations and roofing, the textbooks for concrete and earthwork |
| Finish Trades | California Residential Code (drywall, glazing, egress windows), North American Architectural Woodwork Standards, the textbooks |
| Safety | Cal/OSHA Construction Safety Orders (Title 8), the California MUTCD for traffic control, the Vehicle Code |
California's code books can be read free online through the Building Standards Commission (the study guide points to dgs.ca.gov/bsc). Do not read them cover to cover. Use them to check the answers you get wrong.
The four-week plan
- Week 1 — Core Trades. Day 1: the baseline test. Then Core Trades by trade: concrete and earthwork, then plumbing, electrical and HVAC, then insulation, energy and roofing. Questions first, explanations second, reading only for what you missed.
- Week 2 — the structure. Framing and Structural Components, then Planning and Estimating. Start a handwritten numbers sheet: every dimension, spacing, slope and clearance you meet. Two short math sessions.
- Week 3 — finishes and safety. Finish Trades, then Safety. End the week with your first full timed practice exam: 3½ hours, phone in another room, no notes, one sitting.
- Week 4 — fix, don't add. Sort the mistakes by section and work the two weakest. Drill the numbers sheet and the math. Sit the second full exam at least three days before the real one. Last two days: light review and exam day logistics.
The two-week plan
- Day 1. Baseline test. Adjust the hours table.
- Days 2–4. Core Trades. It is 30% of the exam; keep it to questions and explanations.
- Days 5–6. Framing and Structural Components, plus one math drill.
- Days 7–8. Finish Trades.
- Days 9–10. Planning and Estimating, Safety, and a second math drill.
- Day 11. One full timed practice exam in one sitting.
- Days 12–13. Only what the practice exam got wrong, plus the numbers sheet.
- Day 14. Nothing heavy. Check your ID. Sleep.
Two weeks works for someone who has run whole jobs and dealt with every trade on them. If you have spent your career in one trade, take four.
Studying for both exams
Most B applicants also have to pass Law and Business, inside the same 18 months. Two ways to do it: one exam at a time, with its own plan and date, or both in parallel over six to eight weeks. One at a time is easier to keep honest. If you sit them on the same day, do both full practice exams back to back at least once; seven hours of testing is a long day. The Law and Business version of this plan is here.
What one study session looks like
- Twenty or thirty questions from one section, without looking anything up.
- Read the explanation for every one you missed and every one you guessed.
- Add each new number to your sheet, with its condition: “42 in — deck guard”, not “42 in”.
- Stop while you can still concentrate.
If you use our full course, the 180-day pass builds a plan like this from your exam date and adds a printable key numbers sheet for B. The free guide and the free test work without it.
Common questions
How long should I study for the B General Building exam?
CSLB does not set one. About 24 hours over two weeks or 40 over four works for many people if the hours follow the section weights and include a full timed practice exam.
Which section of the B exam matters most?
Core Trades, at about 30%. Framing and Finish Trades are about 20% each; Planning and Estimating and Safety about 15% each.
Should I take Law and Business and B on the same day?
You can: separate appointments, 3½ hours each. Do it only if you have sat two full practice exams back to back at least once.
Last reviewed 29 September 2026 against the CSLB License Examination Study Guide for General Building (B), 13E-B (03-2026) and the CSLB Examinations FAQ. The study hours are our recommendation. Not legal advice. We are not affiliated with CSLB or PSI.