Client consulting a Licensed Contractor about home construction project 

Contractor Licensing in Unincorporated Boulder County

The Colorado State Legislature granted counties the authority to establish contractor licensing programs. Boulder County licenses contractors for work in the unincorporated county. An overview of the program and its major elements are highlighted below. See Boulder County Contractor Licensing Program for further details, or view Licensed Contractors Serving Boulder County.

Building Contractors

A contractor is anyone who engages in any type of work for compensation for which a building permit is required or who directs or supervises such work.

People not considered to be contractors in unincorporated Boulder County are:

  • The property owner
  • A laborer working under the supervision of a contractor
  • A person who is performing labor or repair work on their own property
  • An employee of the property owner who performs full-time maintenance or repair work on the property owners property

Plumbers and electricians are licensed by the State of Colorado.

The Chief Building Official administers the contractor licensing program and is responsible for:

  • Reviewing license applications
  • Issuing licenses or provisional licenses
  • Denying a license
  • Suspending or revoking a license

The Building Official may issue the license, issue a provisional license, or deny the license application. The Official will also conduct hearings for the appeal of a revoked or suspended license.

Types of Licenses

  • Class A: Commercial construction
  • Class B: Commercial remodeling or tenant finish
  • Class C: One & two-family residential
  • Commercial Mechanical: Commercial mechanical installations and repair
  • Residential Mechanical: Residential mechanical installations and repair
  • Roofing: new roofing, re-roofing
  • Class M: includes but not be limited to: deconstruction, masonry, grading and excavations, repair and installation of signs, solar photo-voltaic equipment installation and repair, residential elevator repair and installation, window replacements, re-siding, installation of listed wood-burning appliances, 1-story pre-engineered agricultural buildings that do not contain habitable space, electrical, hvac, or plumbing.

Your business will be added to the Licensed Contractor List once you have received your contractor’s license. A Boulder County Contractor License is good for 3 years from the date of issuance.

License Requirements and Conditions

The requirements and conditions for issuance of a contractor’s license include:

  • The submission of a completed Contractor License Application. The Chief Building Official will review the application within 7 days.
  • Showing proof of having passed the applicable ICC exam or providing a license from another Colorado municipality or county that uses the ICC contractor's examination as a basis for licensing
  • Providing proof of lawful presence
  • Providing proof of contractor's liability and workman's compensation insurance
  • Paying the licensing fee:
    • Class A: $350
    • Class B: $300
    • Class C: $250
    • Roofing: $150
    • Class M: $150
    • Commercial Mechanical: $200
    • Residential Mechanical: $175

Suspending or Revoking Licenses

If the Building Official finds that there is cause to suspect danger to public health and safety he may order the immediate suspension of the license and may order work stopped on the project or may refuse to issue a Certificate of Occupancy.

The Building Official may suspend or revoke an issued license if it is determined that the license was issued based on:

  • False or incomplete information
  • Failure to maintain insurance
  • Failure to maintain lawful presence
  • Failure to obtain a building permit
  • Failure to comply with the code
  • Working outside the scope of the license
  • Lack of competence
  • Other reasons

If a license is revoked or suspended by the Building Official he shall notify the licensee in writing. The licensee shall have two weeks to request a hearing before the Building Official. The Building Official shall schedule the hearing time and date within 7 business days of receipt of the hearing request. Upon completion of the hearing the Building Official shall notify the licensee within 10 days after the hearing of his findings.

Appeals to a Suspended or Revoked License

If a contractor is aggrieved by a decision of the Building Official's related to a suspended or revoked license or the inability to obtain a license, the contractor may make a written appeal to the Boulder County Board of Review within 14 days of the decision being appealed.

A hearing date shall be made no earlier than 15 days and no later than 45 days after the receipt of the appeal. The secretary of the BOR shall analyze the appeal and notify the appellant of the hearing date at least 7 days prior to the hearing. Results of the hearing shall be issued to the appellant in writing within 14 days of the hearing.

The application fee for appealing to the BOR is $500. The contractor may re-apply for a denied or revoked license after waiting 90 days.


    Land Use Building Safety and Inspection Services

    Email: Ask a Building Official
    Main: 303-441-3926
    Fax: 303-441-4856

    Courthouse Annex Building

    2045 13th Street
    Boulder, CO 80302
    8 a.m. - 4:30 p.m. M, W, TH, F
    10 a.m. - 4:30 p.m. Tuesday
    Plan review services for building permits are not available on Tuesdays.
    Building permits can be applied for and issued until 4 p.m.
    Map & Directions

    Mailing Address

    PO Box 471
    Boulder, CO 80306