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<br />The demolition of any one- and two-dwelling unit buildings or one-story building or <br />structure is permitted. The contractor may install nonbearing partitions or do interior <br />finish work in any type of building or structure. All work shall be performed under <br />the supervision of the holder of a Class A or B Construction Supervisor Certificate. <br />C. Building Contractor Class C (Residential Contractor ICC <br />Classification). To erect, add to, alter, or repair one and two family dwellings, U <br />Occupancy buildings, or tenant improvements in townhouses. The demolition of any <br />one- and two-dwelling unit building or U Occupancy building or structure is <br />permitted. All work shall be performed under the supervision ofthe holder of a Class <br />A, B, or C Construction Supervisor Certificate. <br />D. Building Contractor Class D. To perform building construction <br />work that is covered by the building codes as adopted by the City in Title 15 of this <br />Code, but not assigned to any other license listed in this Section. <br />E. Plumbing Contractor Class A. To install, add to, alter, or repair <br />sanitary plumbing, potable water supply piping, and appliances connected thereto, <br />storm sewer, gas piping, water heaters, gas ranges, domestic gas incinerators, <br />swimming pool and spa piping, solar plumbing utilized for potable water, and all <br />medical gas and vacuum systems in health care facilities. All work shall be <br />performed under the supervision of the holder of a State of Colorado Master <br />Plumbers License. <br />F. Plumbing Contractor Class B. To install, add to, alter, or repair, in <br />one- or two- family dwellings, townhomes, and Group U Occupancies only, sanitary <br />plumbing, potable water supply piping and appliances connected thereto, storm <br />sewer, gas piping, water heaters not exceeding 100 Mbtu input, gas ranges, domestic <br />gas incinerators and gas dryers, swimming pool and spa piping. All work shall be <br />performed under the supervision of the holder of a State of Colorado Master <br />Plumbers License. <br />G. Heating and Ventilating Contractor Class A. To install, add to, <br />alter, or repair warm air heating, venting, ventilation, evaporative cooling, exhaust <br />systems and their appurtenances, ductwork, dust collection systems, domestic and <br />commercial range hoods, water heaters not exceeding 100 Mbtu input, gas piping; <br />burners, controls and venting, trash and laundry chutes; exterior sheet metal, duct <br />insulation, low voltage wiring that does not exceed 48 volts and is not enclosed in a <br />conduit or raceway and maximum of 10 tons of refrigeration when it is utilized for <br />comfort cooling and the refrigerating system is self-contained. This refrigeration <br />shall not include systems with precharged lines or separate air-cooled condenser or <br />chilled water systems. <br />H. Heating and Ventilating Contractor Class B. To install, add to, <br />alter, or repair, in one or two-family dwellings, townhomes, or U Occupancies only, <br /> 5 <br />