CSLB Building Moving and Demolition (C-21): Online Practice Exam

What this exam covers

Practice questions for the California CSLB Building Moving / Demolition (C-21) license exam, delivered online and graded instantly. Per the state's classification, a C-21 contractor raises, lowers, cribs, underpins, demolishes and moves or removes structures, including their foundations. Works on any device, including iPad. See the official CSLB C21 classification.

Updated July 2026 · 2022 CA Codes · 313 Questions · Topic Practice

• Content Last Updated: July 24, 2026
• Code Basis: 2022 California Codes
• Question Count: 313 practice questions
• Organized By: CSLB study-guide topic categories
• Includes: This practice exam has been updated using Peerless’s vetted usable question set. Questions are organized by CSLB study-guide topic categories and include answer explanations to support full-exam review and focused topic practice. Each topic has a mini-exam to help you develop mastery.

Sample questions — Try our free practice test

1. For explosive blast, which can't be used as the source of current?
   A. a blasting machine · B. light circuit · C. power circuit · ✓ D. storage batteries
2. Pedestrian protection must be in place prior to demolishing a building. What protection is required, if the height of construction being required, if the height of construction being removed is more than 8' high?
   A. a distance of more than half o the construction fence height · B. a distance of less than 6' canopy and fence · ✓ C. a distance of not more than a quarter the height of the construction fence · D. a safe walkway around the structure of 4 feet in width
3. All glazed openings shall be removed a minimum of ___ the working level, when a hazard occurs from glass fragmentation.
   ✓ A. 1 floor below · B. 1 floor above · C. a floor equal to · D. none of the above
4. Where should the demolition of exterior walls and floor construction begin with the exception of holes used to drop materials, holes cut in floors for chutes or preparing storage space?
   A. the bottom of the structure going outward · B. the bottom of the structure going upward · ✓ C. the top of the structure going downward · D. none of the above
5. During work, a way of preventing dust from rising is by using:
   A. blowers · ✓ B. water · C. a vacuum · D. the use of filters