Contractor licensing

Colorado contractor license requirements

Colorado does not issue a statewide general contractor license. General, building, and residential contractors are licensed by the city or county where the work is, while electrical and plumbing contractors need a state license from the Division of Professions and Occupations.

A contractor and plan reviewer discuss drawings and permit paperwork across an office desk.
Keep plans, permit requirements and approvals together when preparing construction work. AI-generated illustration.

If you are a general contractor in Colorado, your license comes from the local building department, not the state. Colorado has no statewide general contractor license. Cities, counties, and regional building departments each decide whether to license GCs, what classes they offer, and what proof of competence they accept, which is usually an ICC contractor exam or a license from a city they reciprocate with. The state steps in for two trades: electrical and plumbing contractors are licensed by the State Electrical Board and State Plumbing Board within the Division of Professions and Occupations (DPO) at the Department of Regulatory Agencies.

Colorado contractor licensing at a glance
ItemRule
Statewide general contractor licenseNone; licensing is local
Who licenses GCsCity, county, or regional building department where the job is
Typical local classesClass A General, Class B Building, Class C Residential, Class D Specialty
Typical proof of competenceICC National Standard contractor exam or a reciprocal local license
Electrical contractorsState license through the State Electrical Board, plus local registration
Plumbing contractorsState license through the State Plumbing Board, plus local registration
Plumber continuing education8 hours each license year for residential, journeyworker, and master plumbers
State license lookupDPO Verify a License (apps2.colorado.gov)
Local license lookupThe issuing city or county building department

How local contractor licensing works

The details change from one jurisdiction to the next, but the structure in the Front Range is similar. The City of Thornton is a good example of a typical setup. Thornton requires anyone who builds, alters, remodels, repairs, or equips buildings, installs underground utilities, or builds roads in the city to hold a city contractor license. Homeowners working on their own residence are not considered contractors.

Example: City of Thornton contractor license classes and fees
ClassFeeScope
Class A General Contractor$200Unlimited construction
Class B Building Contractor$150Unlimited except Type I construction, up to three stories
Class C Residential Contractor$100Residential
Class D Specialty (roofing, framing, drywall, mechanical, and others)$75The listed specialty trade
Electrical (state and master licenses required)No feeElectrical

To qualify for Class A, B, or C, Thornton accepts an ICC contractor certification for the adopted code, such as the National Standard General Building Contractor (A), Building Contractor (B), or Residential Building Contractor (C) exams, or a current license from a reciprocating jurisdiction. Its reciprocity table lists Arvada, Aurora, Boulder, Centennial, Commerce City, Denver, Englewood, Fort Collins, Jefferson County, Littleton, Longmont, Louisville, Loveland, Grand Junction, Park County, Pikes Peak Regional, Sterling, and Wheat Ridge for at least the A, B, and C classes. Thornton licenses last one year, cost the same to renew as to obtain, and are applied for online. Since February 13, 2023, Thornton no longer collects insurance information at application or renewal, though other cities may.

Colorado Springs and much of El Paso County fall under the Pikes Peak Regional Building Department. Its Licensing Committee reviews the testing, experience, and licensing of applicants and hears complaints against contractors. Electrical and plumbing contractors licensed by the state must also register with Pikes Peak Regional to work in that jurisdiction.

What this means for a GC working several cities

Say a residential remodeler based in Westminster takes a $220,000 basement and kitchen job in Thornton, then a deck job in Colorado Springs. It needs a license or registration in each place it pulls a building permit. Pass one ICC exam and you can often use the resulting license to get others through reciprocity, but each city decides what it accepts and on which classes. Keep a spreadsheet of every jurisdiction, license class, number, and expiration date. Missing one renewal can hold up a permit on a job that is ready to start.

State licenses: electrical and plumbing

Electrical and plumbing work is the exception to local control. The DPO runs the State Electrical Board and State Plumbing Board, both at 1560 Broadway, Suite 1350, in Denver. Cities expect proof of the state license: Thornton, for example, asks plumbing and electrical contractors for a current State of Colorado contractor license and the master's license. Thornton's electrical contractor registration runs two years.

  • Plumbers: residential, journeyworker, and master plumbers with an active license must complete at least 8 hours of continuing education in each license year (March 1 through February 28) of the two-year license period. Plumbers licensed by exam during the current period start CE after their first renewal.
  • Electricians: the State Electrical Board adopts the National Electrical Code by rule, and DPO keeps a separate contact for state electrical and plumbing permit questions.
  • GCs: if your crews do any electrical or plumbing work beyond the scope the city allows, that work needs a state-licensed contractor, usually as your sub.

Lookups and what to check before you hire

For electricians and plumbers, use the DPO Verify a License search at apps2.colorado.gov/dora/licensing/Lookup/LicenseLookup.aspx. For general, building, residential, and specialty licenses, check with the city or county that issued them; there is no single statewide list. On a commercial job, collect the sub's local license number, the state license for MEP trades, and a certificate of insurance even where the city does not require insurance to license. Getting paid in Colorado also depends on your lien and payment rights; read the Colorado mechanics lien guide and the Colorado prompt payment and retainage rules.

Because licensing is local, tracking is the hard part. Smart Business Automator keeps each subcontractor's licenses by jurisdiction, along with insurance and expiration dates, so you see what is about to lapse. See subcontractor compliance automation.

Frequently asked questions

Does Colorado have a state general contractor license?

No. Colorado does not license general contractors at the state level. Cities, counties, and regional building departments license them, often in Class A, B, C, and D categories, and most accept an ICC contractor exam or a reciprocal local license as proof of competence.

Which contractors does the State of Colorado license?

Electrical and plumbing contractors and the individual electricians and plumbers who work for them. Those licenses come from the State Electrical Board and State Plumbing Board in the Division of Professions and Occupations. Local jurisdictions may still require them to register.

Does a Denver or Aurora license work in other Colorado cities?

Sometimes. Many Front Range jurisdictions reciprocate. Thornton, for example, accepts A, B, and C licenses from Denver, Aurora, Boulder, Fort Collins, Jefferson County, Pikes Peak Regional, and others. Each city sets its own list, so check before you bid.

How do I look up a Colorado contractor license?

Electricians and plumbers can be checked on the DPO Verify a License search. General and specialty contractor licenses are issued locally, so check with the city or county building department that issued the license.

Sources

  1. Colorado Division of Professions and Occupations: Colorado Electrical Homepage (State Electrical Board)
  2. Colorado Division of Professions and Occupations: Colorado Plumbing Homepage (State Plumbing Board)
  3. Colorado DORA: Verify a License
  4. City of Thornton: Contractor License Information and Forms (updated January 25, 2024)
  5. El Paso County: Pikes Peak Regional Building Department Licensing Committee

Laws and rates change. Confirm current requirements with the state agency before you bid, file, or pay. This page is general information, not legal advice.

Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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