The City of Longmont requires a contractor license for the trades/type of construction listed below.  Please contact Building Inspection for more information about the requirements to obtain a contractor license at (303) 651-8332 or building.inspection@longmontcolorado.gov

Class A
Class B
Class C
Class D Specialties
Class M Mechanical
Class E Electrical
Class P Plumbing

Class A. The Class A license entitles the licensee to contract for the construction, alteration or repair of any type or size of building or structure permitted by the International Building Code except electrical, plumbing, mechanical, fire extinguishing, and elevators. The holder of a Class A can demolish any building or structure (or portion thereof) when rebuilding on site.

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Class B. The Class B license entitles the licensee to contract for the construction, alteration or repair of any type or size of building or structure permitted by the International Building Code except those classified as Type IA or Type IIA construction or electrical, plumbing, mechanical, fire extinguishing, and elevators. The holder of a Class B can demolish any building or structure (or portion thereof) when rebuilding on site.

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Class C. The Class C license entitles the licensee to contract for the construction, alteration or repair of single family dwellings, or multi-family dwellings with a maximum of four dwelling units and three stories or less in height, including accessory buildings. The holder of a Class C can demolish buildings or structures (or portion thereof) when rebuilding on site.

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Class D Specialty. The Class D license entitles the licensee to contract for labor or for labor and materials involving only one trade. A Class D licensee may be licensed to perform more than one specialty. These include:

• D01 - Lathing, Plastering and Drywall
• D02 - Roof Covering and Waterproofing
• D03 - Masonry and Fireplaces
• D04 - Concrete Foundations and Caissons
• D05 - Wood Framing
• D06 - Swimming Pools and Spas
• D07 - Structural Metals
• D08 - Precast Concrete Building Units
• D09 - Prefabricated Metal Patios, Carports and Awnings
• D10 - Siding
• D11 - Elevators
• D12 - Demolition
• D13 - Moving
• D14 - Fire Sprinklers
• D15 - Low-Voltage
• D16 - Lawn Sprinkler
• D17 - Signs
• D18 - Manufactured Home Installation
• D19 - Replacement Windows Including Glass and Glazing
• D20 - Other Specialty Trade not Listed Above
• D21 - Fence
• D22 - Insulation
• D23 - Gas Fireplaces Including Gas Piping
• D24 - Commercial Kitchen Hood Cleaning

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Class M Mechanical. The Class M Mechanical license entitles the licensee to install, add to, alter, or repair warm air heating, venting, evaporative and refrigeration cooling, exhaust systems and their appurtenances, process piping, refrigeration systems, and related appurtenances.

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Class E Electrical. No person shall receive a permit to engage in the electrical installation wiring, appliance, or electrical apparatus of any nature, kind or description (except central stations, power houses, or substations) for the purpose of transmitting or utilizing electric current for light, heat, power, or electrical signal systems or other purposes inside of or in connection with any building or buildings without an electrical contractor's license from the State of Colorado.

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Class P Plumbing. In order to contract for the installation, altering, or repairing of plumbing fixtures and apparatus of any kind or nature a person must register with the State of Colorado as well as with the Division of Building Inspection. This registration shall include: applicant name, place of business, the Master Plumber's name and license number.