Colorado Contractor License Exam Guide (2026)

How Colorado licenses contractors

Colorado regulates electricians and plumbers at the state level through the State Electrical Board and State Plumbing Board, both housed in DORA. PSI (test-takers.psiexams.com/co) delivers those exams. General contractors remain locally licensed, so Denver, Aurora, and Colorado Springs still require municipal tests and ICC credentials.

The state swings from -20°F blizzards to 100°F dry heat, so you'll see test items on freeze protection, expansion tank sizing, wildfire defensible space, and hail-rated assemblies. Mountain counties enforce higher snow, wind, and seismic categories than the plains.

Official source: Colorado Division of Professions and Occupations

Colorado contractor license types

State electrical/plumbing licenses renew every three years with CE. Local GC licenses may renew annually and often require ICC pass letters, so track each jurisdiction separately.

What's on the Colorado contractor exam

PSI operates centers in Denver, Colorado Springs, Fort Collins, Grand Junction, Pueblo, and Durango. Seats book quickly in spring before permit season, so reserve slots early and bring original approval letters.

What Colorado exam questions emphasize

• Altitude adjustments for combustion air, boiler derates, and conductor ampacity.
• Snow and ice management—heat trace sizing, roof anchors, and drainage protection.
• Wildfire and hail mitigation, including Class 4 roofing materials and defensible space.
• Colorado-specific permitting, CE, and supervision ratios for apprentices.

Exam-day logistics

• Arrive 30 minutes early; bring two IDs and your eligibility letter from DORA or the local jurisdiction.
• Closed-book for most trade exams—only code books listed in the bulletin are allowed, and some portions are no-reference.
• Failed portions can be retaken after a 7-day waiting period; scores remain valid for one year.

Trade-specific exam guides

If you're licensing in a single trade rather than the Colorado general contractor classification, the dedicated trade hub will get you to the right code book and exam structure faster.

• General contractor exam guide — IBC/IRC, NASCLA acceptance, and Business & Law.
• Electrical contractor exam guide — NEC (NFPA 70) calculations and grounding/bonding.
• Plumbing contractor exam guide — IPC/UPC drainage sizing, venting, and backflow.
• HVAC contractor exam guide — IMC ventilation, refrigerant management, and load calcs.

Colorado code books & approved references (2026)

Always confirm the exact editions and tab rules in your candidate bulletin before exam day. Editions can change between license cycles.

• 2023 National Electrical Code with Colorado amendments.
• 2021 Uniform Plumbing Code with Colorado amendments (or IPC where locally adopted).
• 2021 International Building Code and International Residential Code for municipal GC exams.
• Colorado Revised Statutes Title 12, Article 155 (electricians and plumbers).
• OSHA 29 CFR 1926 Subpart K and safety references for confined spaces and fall protection.

Fees & timeline for the Colorado contractor license

• PSI sets exam fees per classification; confirm pricing inside your authorization email.
• State license application and renewal fees are collected by DORA and differ for masters, journeymen, and residential licenses.
• Local GC licenses require separate fees, bonds, and insurance filed with each city or county.
• Continuing education providers charge per contact hour—budget those costs alongside renewal fees.
• Fingerprint/background check fees apply to electrical applicants who have not been previously licensed in Colorado.

Use the All States page to see which nearby jurisdictions share exams, then confirm Colorado's official fee schedule before paying.

Colorado Business & Law focus

Colorado's electrical and plumbing exams include business, law, and safety domains that cover permitting, supervision ratios, workers' compensation, and lien procedures. Municipal GC exams add contract and code administration questions.

• Know supervision ratios (1 journeyman per 3 apprentices for electrical; 1:3 for plumbing) and the penalties for violations.
• Understand Colorado's trust fund statute for construction payments and how it affects retainage.
• Memorize permitting responsibilities when working across home-rule cities.
• Review CE tracking and renewal timelines so you do not let a state license lapse.

Practice with our national Business & Law exam hub for cross-state baseline rules.

A focused 4-week study plan for the Colorado exam

Because the state swings from -20°F blizzards to 100°F dry heat, so you'll see test items on freeze protection, expansion tank sizing, wildfire defensible space, and hail-rated assemblies, this four-week outline targets what Colorado field inspectors and your licensing board exam items actually test—not generic national prep.

1. Week 1 — Map the exam. Pull your current candidate bulletin, list every reference, and confirm the modules you have to pass. Start a one-page error log. Spend extra time on: Altitude adjustments for combustion air, boiler derates, and conductor ampacity..
2. Week 2 — Code book navigation. Drill open-book lookups (or memorisation drills if your module is closed-book) until you can find any answer in under 60 seconds. Anchor practice around: Snow and ice management—heat trace sizing, roof anchors, and drainage protection..
3. Week 3 — Business & Law. Colorado's electrical and plumbing exams include business, law, and safety domains that cover permitting, supervision ratios, workers' compensation, and lien procedures. Municipal GC exams add contract and code administration questions. Layer in scenario-based questions on contracts, lien notice, payroll, and insurance.
4. Week 4 — Full simulations. PSI operates centers in Denver, Colorado Springs, Fort Collins, Grand Junction, Pueblo, and Durango. Seats book quickly in spring before permit season, so reserve slots early and bring original approval letters. Run two full-length timed simulations. Review every miss with a one-sentence rule statement.