Colorado to Montana: general contractor license reciprocity

How local licensing works. Each Colorado jurisdiction licenses building contractors under its own ordinance and building code, and there is no state board above them. Class letters and size thresholds differ from place to place, so a Class B in Fort Collins is not a Class B in Colorado Springs. What is consistent is the exam: most jurisdictions require an ICC National Standard contractor examination, open book and multiple choice through Pearson VUE, and the Pikes Peak notice explains why that matters - "with successful passage of an ICC contractor exam, contractors can be secure in the knowledge that their results may be honored by many jurisdictions in Colorado and throughout the United States. However, each jurisdiction has the right to determine if this exam is acceptable." The same exam appears as W11, F11 or G11 for the unlimited (A) tier and W12, F12 or G12 for the limited (B) tier, depending on which code edition the jurisdiction has adopted, and departments generally require results from the current or a recent code year. The notice also warns that "passing an ICC contractor exam is NOT a license to practice and does not guarantee licensing in any jurisdiction."

Denver. The individual first earns a supervisor certificate. Class A covers "to erect, add to, alter, demolish, or repair any building or structure" and needs seven years of notarized commercial experience including ground-up high-rise work over 75 feet plus ICC exam #F11. Class B covers any building classified as less than a high rise and needs four years of notarized commercial experience on ground-up builds of 55 to 75 feet plus ICC exam #F12; Class B-2 caps the highest floor level or occupiable roof at 30 feet, with four years of experience including ground-up projects up to 40 feet, also on ICC #F12. Certificates cost $60 and renew every three years. The company then buys the General Contractor Class A or Building Contractor Class B license at $250 for three years. Denver states it "does not accept or reciprocate contractor licenses and/or certificates from other counties or states."

Colorado Springs, El Paso County and nearby towns (Pikes Peak Regional Building Department). Building Contractor A-1 covers "the construction, alteration and repair of any type or size of structure permitted by the Regional Building Code"; A-2 is the same except Group A, E and I occupancies over 30,000 square feet and any building requiring Type I construction; B-1 covers all occupancies except Groups A, E, I and H and Type I construction; B-2 covers nonstructural remodeling plus Group B, F, M or S buildings up to one storey and 7,500 square feet and Group R buildings up to 16 units and two storeys. License fees are $200 for A-1 and A-2, $175 for B-1 and B-2, on top of a $50 non-refundable application fee, and each of these classes requires an exam. Applicants supply three reference forms documenting experience, copies of all licenses held inside or outside Colorado, liability insurance naming PPRBD, workers' compensation, a Colorado certificate of good standing and a name-based judicial record check. Files close three weeks before the monthly Licensing Committee meeting, the Board of Review approves the following week, and the license must be claimed within 60 days. PPRBD accepts ICC National Standardized or ICC Colorado Standard exams passed on or after January 1, 2016 and states that "no out-of-state exams will be accepted."

Aurora. A single Commercial Building Contractor license "Requires ICC General Building Contractor 'A' OR 'B' Certification"; the supervisor license fee is $131 and the license fee is $392, plus registration and three job references. Limited Building Commercial and Demolition contractors register with three years of documented experience instead.

Fort Collins. Class A and A(DR) cover any building or structure; Class B and B(DR) cover new builds up to and including five storeys; Class C1 and C2 cover new builds up to three storeys and multi-family housing projects; E(C) covers nonstructural commercial alterations. Classes A and B require ICC exam G11 over the 2018 IBC plus the concrete manual, and Classes C1, C2 and E(C) require ICC exam G12, with G11 also accepted in place of G12. Every general contractor class also needs three project verifications with permits and final inspection records signed by someone unconnected to the applicant, and general liability of $1,000,000 per person with $2,000,000 per accident, property damage and aggregate. A new license with supervisor certificate is $300 for a two-year term including a $75 non-refundable application fee; renewals are $225. The city adopted the 2024 ICC codes with amendments in December 2025 and requires exam results from a current code year.

Boulder. Class A covers "the construction, alteration, wrecking, or repair of any type or size of building or structure permitted in the City of Boulder" and requires the ICC A Contractors certificate; Class B covers commercial and residential buildings of construction types V, IV, III-B and II-B and requires the ICC B certificate. New Class A and Class B applicants must also document education, training or years of experience in non-residential construction. Boulder states that it "does not accept reciprocal licenses from other jurisdictions," and its license covers work inside city limits only.

Jefferson County. Class A (labeled 2018 G11) covers "the construction, alteration, tenant finish or repair of any type of structure permitted by the Building Code" and Class B (2018 G12) covers commercial buildings and single- or multi-dwelling buildings up to three storeys. The county accepts "proof that you have passed an appropriate ICC exam within the last 3 years or ... a copy of a valid license issued from an ICC participating jurisdiction." The fee is $50 and licenses renew annually.

Arapahoe County. Building Contractor Class A (commercial) and Class B (commercial/residential) each cost $360 and require the matching ICC certification "or equivalent" certification by a recognized state or national certification entity; Class D specialty is $84. Insurance must carry a $2,000,000 general aggregate and $1,000,000 each occurrence, with the county as an additional holder.

Lakewood. Class A-1 Unlimited Commercial is "only issued to contractors with experience in building high-rise construction"; A-2 Limited Commercial is limited to two-storey commercial or four-storey R occupancies; A-4 covers commercial and residential remodeling not exceeding 30 percent of the original structure. A-1 and A-2 applicants attach any ICC certifications they or their employees hold. Fees are $150 for the first probationary year and $400 for each subsequent three-year renewal.

Douglas County. Unincorporated Douglas County registers general contractors rather than licensing them and states that it "has no testing requirements." Registration needs the application, workers' compensation proof or an exemption statement and business liability insurance naming the Building Division; fees are currently waived.

Out-of-state holders. None of the jurisdictions reviewed will convert another state's general contractor license into a Colorado one. Denver and Boulder rule it out in writing, and PPRBD will not accept exam results earned out of state. What does carry across is the ICC National Standard contractor certification: pass the (A) or (B) exam on a code edition the jurisdiction currently accepts and it will usually satisfy the testing requirement in Denver, Colorado Springs, Aurora, Fort Collins, Boulder, Jefferson County and Arapahoe County, though each department still verifies experience, references or project history separately and charges its own fee. Jefferson County goes further and accepts a current license from another ICC participating jurisdiction in place of the exam. Check the required class, exam code year and fee with each building department before applying, and expect to hold a license in every jurisdiction where you pull permits.