C-4 · HVAC & mechanical

Boiler, Hot-Water Heating and Steam Fitting Contractor

705 contractors hold a California C-4 Boiler, Hot-Water Heating and Steam Fitting Contractor license

What Does a C-4 License Cover?

Installs, services, and repairs power boiler installations, hot-water heating systems and steam fitting, including fire-tube and water-tube boilers, piping, fittings, valves, gauges, pumps, radiators, fuel oil tanks, chimneys, flues, and associated solar heating equipment.

Does not cover

Does not include warm-air heating or air conditioning systems (see C-20).

Hiring tip

Boiler and process piping work requires strict adherence to pressure vessel codes. Confirm the contractor is familiar with local jurisdiction requirements and that all work will be inspected by a certified inspector.

A California contractor license is generally required when a project costs $1,000 or more in combined labor and materials, requires a building permit, or uses additional workers. Small jobs cannot be split from a larger project to qualify for the exemption. Read the CSLB requirements.

Also in HVAC & mechanical

C-20: Warm-Air Heating, Ventilating and Air-Conditioning (HVAC) Contractor C-38: Refrigeration Contractor C-2: Insulation and Acoustical Contractor

Related Classifications

C-20: Warm-Air Heating, Ventilating and Air-Conditioning (HVAC) Contractor C-36: Plumbing Contractor

Licensing Resources

Deposit and payment rules for California contracts
Home improvement contract requirements
How to verify a contractor license

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