How to Pass the California C-21 Building Moving and Demolition Contractor Exam
To prepare for the California C-21 Building Moving and Demolition exam, study the current CSLB outline by section, not just by job experience. Begin with a baseline, give extra attention to Planning and Estimating (25% of the outline) and other weak high-weight areas, then practice mixed scenarios until you can explain the method behind each answer.
Independent-provider notice: Peerless Institute is not affiliated with, endorsed by, or sponsored by CSLB. Practice examples here are original study material.
Current CSLB C-21 Building Moving and Demolition exam outline
The official CSLB C-21 Building Moving and Demolition study guide applies to examinations scheduled on or after July 1, 2024. CSLB describes these percentages as approximate. The trade exam is closed book; check the current PDF and your exam notice before testing.
| Official section | Approximate weight | What to practice |
|---|---|---|
| Planning and Estimating | 25% | Evaluating plans and specifications; Evaluating hazardous materials surveys; Evaluating job site readiness |
| Project Preparation | 20% | Permitting and notification; Mobilizing labor, equipment, and materials; Developing recycling plans |
| Building Moving | 13% | Moving preparation; Determining weight and structural integrity; Building raising and lowering |
| Structure Demolition | 21% | Pre-demolition site preparation; Demolition of single- and multi-story structures; Separating demolished materials |
| Safety | 21% | Job site safety; Personnel safety; Implementing traffic controls |
Section-by-section study guide
Use the outline as a checklist, not a promise that every bullet gets an equal number of questions. After a diagnostic, spend extra time on weak high-weight sections.
Planning and Estimating (25%)
CSLB lists evaluating plans and specifications, evaluating hazardous materials surveys, evaluating job site readiness, determining job methods and equipment, among other topics. Work from a plan or scope sheet: mark assumptions, units, quantities, dependencies, and any information that must be confirmed before estimating.
Project Preparation (20%)
CSLB lists permitting and notification, mobilizing labor, equipment, and materials, developing recycling plans, removing hazardous materials. Turn each listed topic into one plan-reading, material-selection, or field-sequence question; review why the incorrect choices would fail.
Building Moving (13%)
CSLB lists moving preparation, determining weight and structural integrity, building raising and lowering, building support and transportation. Turn each listed topic into one plan-reading, material-selection, or field-sequence question; review why the incorrect choices would fail.
Structure Demolition (21%)
CSLB lists pre-demolition site preparation, demolition of single- and multi-story structures, separating demolished materials, transporting materials and debris, among other topics. Sketch the sequence from preparation through inspection or closeout. For each step, name the prerequisite, a common failure point, and a check before proceeding.
Safety (21%)
CSLB lists job site safety, personnel safety, implementing traffic controls, personal protective equipment (ppe). For each scenario, identify the hazard, the first safe action, and which fact in the prompt changes the response. Verify technical requirements in the current applicable rules, not memory alone.
Two-, four-, and six-week study paths
Two weeks: Use this only if you already have broad recent experience and can practice daily. Diagnose on day one; spend the next several days on Planning and Estimating (25%) and Structure Demolition (21%); rotate through remaining sections; finish with a timed mixed set and a review of every miss or guess.
Four weeks: Week 1: read the official guide, take a baseline, and build an error log. Week 2: work the highest-weight weak sections using drawings, calculations, or installation sequences. Week 3: cover remaining trade sections and safety. Week 4: take timed mixed sets and revisit weak topics with fresh questions.
Six weeks: Add more depth to each field section and retest a week after first reviewing it. Reserve the last week for mixed practice, the error log, and test-day instructions. These are Peerless example schedules, not CSLB requirements.
Original worked C-21 Building Moving and Demolition example
Question: A concrete pad measures 20 ft by 30 ft by 6 in. thick. What is its in-place volume, ignoring expansion or debris bulking?
Answer: About 11.1 cubic yards.
Why: 20 × 30 × 0.5 = 300 cubic ft; 300 ÷ 27 ≈ 11.1 cubic yd. Hauling estimates must separately account for actual material and bulking.
This is an original study exercise, not a recalled CSLB question.
Choose your next practice step
- Free C-21 Building Moving and Demolition practice test — use it as a short baseline, then sort missed questions by official section.
- C-21 Building Moving and Demolition printed study guide — structured reading and review.
- C-21 Building Moving and Demolition online practice exam — repeat mixed and targeted practice.
- Law and Business exam guide — study this separate required examination too.
Frequently asked questions
What should I study first for C-21 Building Moving and Demolition?
Start with a diagnostic, then prioritize weak sections with larger approximate weights. Planning and Estimating is the largest section at 25%, but your own weak areas determine the order.
Is the C-21 Building Moving and Demolition trade exam open book?
No. The current CSLB study guide says no reference materials may be used during the exam.
Are these Peerless questions actual state-exam questions?
No. Peerless uses original study questions; this page is based on the public CSLB content outline.
Do I also need Law and Business?
CSLB describes a separate Law and Business exam for contractor-license applicants. Check the official requirements that apply to your application.
Source: CSLB C-21 Building Moving and Demolition Examination Study Guide; reviewed October 13, 2026. The official guide and examination notice control if information changes.