Colorado HVAC License Requirements (2026) | Denver Mechanical and EPA 608 Guide

Colorado does not issue a state-level HVAC or mechanical contractor license at the journey or master level. HVAC contracting is regulated city by city, and the Denver Department of Community Planning and Development runs the dominant program through its Mechanical Contractor license tied to a Denver Supervisor Certificate. Colorado Springs (Pikes Peak Regional Building Department), Aurora, and Fort Collins each operate parallel programs with their own examinations. At the federal level, every HVAC technician who opens a refrigerant circuit must hold an EPA Section 608 certification under 40 CFR Part 82. Commercial boiler and pressure vessel work is separately overseen by the Colorado Department of Labor and Employment Boiler Inspection Program.

Regulatory Body Profile

Authority over this credential rests with City and County of Denver — Department of Community Planning and Development, Building Division (Denver DSD) (DSD), which issues and polices it under Denver Revised Municipal Code Chapter 10 (Building Code); Denver Building and Fire Code. Denver DSD licenses building contractors (Class A, B, C, and D) inside the City and County of Denver, issues permits, performs inspections, and enforces the Denver Building and Fire Code. Colorado does not issue a state general contractor license; municipal authority is the only path.

Official portal: https://www.denvergov.org/Government/Agencies-Departments-Offices/Agencies-Departments-Offices-Directory/Community-Planning-and-Development/Building
Address: 201 W Colfax Avenue, Department 205, Denver, CO 80202
Phone: (720) 865-2705

The Eligibility Audit

The threshold requirements are straightforward: age 18 or above, plus a valid Social Security Number. No Colorado residency requirement; the qualifying supervisor must be a full-time employee, owner, or officer of the licensed business.

Good moral character

Denver DSD reviews fitness for every mechanical supervisor certificate applicant. Felony convictions and prior license discipline are reviewed individually.

Background investigation

Mandatory criminal history disclosure on the Denver supervisor certificate application.

Experience and Education Standards

The experience bar is four years of verifiable mechanical HVAC experience for the Denver Supervisor Certificate at the mechanical classification. The qualifying supervisor must demonstrate hands-on responsibility for installation, service, and code-compliance decisions on projects matching the Denver scope., and it must be backed by verifiable records — typically payroll, tax, project, or supervisor documentation covering the claimed period.

Accepted proof of experience or eligibility

Denver Supervisor Certificate experience verification form signed by each prior employer
Project list with addresses, permit numbers, and roles
W-2 statements, 1099 records, or notarized affidavits covering the qualifying period
EPA Section 608 certification card (Type I, II, III, or Universal)

Education substitution

Accredited HVAC technology or mechanical engineering technology coursework substitutes for portions of the experience requirement. Denver allows up to two years of substitution for an accredited HVAC associate degree.

The Exam Syllabus

ICC (International Code Council) under contract to Denver DSD; computer-based testing at PSI test centers administers the required examination. Each part below must be passed before the license will issue:

Denver Mechanical Supervisor Examination — International Mechanical Code, International Fuel Gas Code, and Denver amendments — 80 questions, 240 minutes, passing score 75%
Denver Business and Law Examination — Colorado business law, mechanics liens, and Denver licensing rules — 50 questions, 120 minutes, passing score 75%

Examination fee: $129 per ICC examination part paid at the PSI test center.

Retake policy: Failed parts may be re-taken individually after a 30-day wait by paying a new $129 fee. Application records remain valid for one year.

Bonding, Insurance & Financial Security

No license surety bond is mandated statewide here under the cited sources, though project-specific or public-works bonding obligations can still attach to a given job.

General liability

Denver requires the mechanical contractor business to carry general liability insurance with minimums of $500,000 per occurrence and $1,000,000 aggregate. Colorado Springs and Aurora impose comparable minimums.

Workers' compensation

Workers' compensation insurance is mandatory in Colorado under CRS 8-44-101 et seq. for any business with one or more employees including part-time.

Additional financial requirements

No state or Denver net-worth requirement. Denver requires proof of insurance and an active Colorado business registration at issuance and every renewal.

Schedule of Fees

Fee	Amount
Application (non-refundable)	$250
Examination	$258
Initial license	$350
Renewal (every 2 years)	$250

Renewal and Continuing Obligations

The Denver Mechanical Contractor License (Municipal) + EPA Section 608 (Federal) runs on a 2 years renewal cycle. The current renewal fee is $250. Denver Mechanical Contractor licenses renew every two years. EPA Section 608 is a one-time certification that does not expire, though individual refrigerant types may require re-certification if the federal rules change.

Continuing education: Continuing education is required for the Denver Mechanical Supervisor Certificate at each two-year renewal cycle. Denver publishes the approved provider list and hour requirement.

Downloadable Asset

2026 Colorado HVAC License Roadmap (PDF) — a printable step-by-step checklist for the application process.

Download the PDF roadmap →

Out-of-State Reciprocity

For this classification, Colorado does not recognize the NASCLA Accredited Examination.

Reciprocal State	Accepted Exam	Conditions
Colorado Springs	—	Pikes Peak Regional Building Department accepts Denver Mechanical Supervisor Certificates after a Colorado Springs business and law exam.
Aurora	—	Aurora Building Division accepts the Denver mechanical ICC examination; a separate Aurora business license is still required.
Fort Collins	—	Fort Collins Building Services accepts the ICC mechanical examination at the Denver pass score; a separate Fort Collins license application is still required.

There is no statewide Colorado HVAC license, so reciprocity is municipal and inconsistent. Work in Denver, Colorado Springs, Aurora, and Fort Collins typically requires four separate licenses. EPA Section 608 certification is federal and is honored in every state.

Weighing more than one jurisdiction? The national hub compares HVAC license requirements in every state — exam, bond, fee, and experience thresholds side by side.

The Application Roadmap

Earn EPA Section 608 certification. Type I (small appliances), II (high-pressure), III (low-pressure), or Universal. Required federally the first time a technician opens a refrigerant circuit.
Confirm the city or jurisdiction. Identify every Colorado municipality you intend to work in. Each runs its own program. Denver is the dominant authority for the metro area.
Document four years of mechanical HVAC experience. Experience must match the Denver mechanical classification scope and be verifiable through prior employers.
Pass the ICC Denver Mechanical Supervisor exam at 75%. Schedule the trade exam and the business and law exam through PSI. Both are required.
Register the business with Colorado and Denver. File a Colorado Secretary of State business registration and a Denver business license application before submitting the contractor license application.
Submit proof of insurance and workers compensation. Upload general liability and Colorado workers compensation certificates naming Denver as a certificate holder.
File the Denver Mechanical Contractor License application. Submit the license application with all documentation, exam pass certificates, and the fee. Denver issues the license after review.

Pre-Application Checklist

Have each of the following squared away before the packet goes to DSD:

☐ EPA Section 608 certification card (Type I, II, III, or Universal)
☐ Four years of mechanical HVAC experience documented on the Denver verification form
☐ Denver Supervisor Certificate application with fee
☐ ICC Denver Mechanical Supervisor exam pass certificate at 75%+
☐ ICC Denver Business and Law exam pass certificate at 75%+
☐ Denver Mechanical Contractor License application with insurance certificate
☐ Colorado workers compensation certificate (any business with one or more employees)

Where Applications Stall

The following pitfalls summarize the issues most likely to delay, return, or derail a Colorado HVAC application based on the published board instructions and source materials cited on this page.

Assuming Colorado has a state HVAC license

There is no state HVAC license. Contractors who try to work in Denver on a Colorado Springs license get red-tagged at mechanical permit pull.

Skipping EPA 608

EPA Section 608 is federal. Any technician who opens a refrigerant circuit without it is in violation of 40 CFR Part 82 regardless of state or municipal licensing.

Missing the workers compensation threshold

Colorado requires workers compensation for any business with one or more employees. The threshold is stricter than most neighboring states and catches new HVAC companies off guard.

Borrowing a qualifying supervisor

The Denver Supervisor Certificate holder must be a full-time employee, owner, or officer of the licensed business. Denver audits W-2 records.

Ignoring the boiler inspection program

The Colorado Department of Labor and Employment separately regulates commercial boilers and pressure vessels. HVAC contractors working on commercial boilers must coordinate with the state boiler inspection program in addition to the municipal license.

Recommended Study Materials

These materials are drawn from the regulator's own citations and the references applicants commonly use to prepare. CLR receives no compensation for listing them.

International Mechanical Code (current Denver-adopted edition) — International Code Council. Primary technical reference. Open-book at the PSI test center.
International Fuel Gas Code (current Denver-adopted edition) — International Code Council. Required reference for fuel gas piping and venting calculations.
ESCO Institute EPA 608 Certification Manual — ESCO Institute. Standard preparation material for the EPA Section 608 federal certification exam.

Other Colorado Trade Licenses

For a different Colorado credential, see these companion guides published by CLR:

Common Questions

Does Colorado issue a state HVAC license?

No. Colorado does not license HVAC or mechanical contractors at the state level. HVAC is regulated city by city. Denver, Colorado Springs, Aurora, and Fort Collins each run their own program with separate exams, fees, and qualifying-party rules.

What is EPA Section 608 certification?

A federal certification under 40 CFR Part 82 that every technician must hold before opening a refrigerant circuit. Type I covers small appliances, Type II high-pressure systems, Type III low-pressure systems, and Universal all three.

Do I need EPA 608 in Colorado?

Yes. EPA 608 is federal and applies in every state to any technician who services, maintains, repairs, or disposes of equipment containing regulated refrigerants.

Do I need a separate license for every Colorado city I work in?

Usually yes. There is limited municipal reciprocity, but most Front Range cities require their own license application even when they accept the same ICC mechanical examination.

How often does the Denver Mechanical Contractor license renew?

Every two years. Renewal requires current insurance, an active business registration, and continuing education for some classifications.

Primary Sources

Regulatory requirements on this page are drawn from the official board, statute, and exam-provider materials listed below.

Verified 2026-06-18 · Next scheduled review 2026-09-16