HVAC licenses and permits in Columbia
Heating and cooling work inside Columbia city limits requires a city license under the mechanical code, and only a licensed master mechanic may apply for the permit. Missouri issues no statewide HVAC license, so in Ashland, Centralia or the county the answer depends on the town.
On this page
The city's rules
Columbia builds on the International Mechanical Code and adds its own amendments in Chapter 6, Article V of the city code. Among them:
- Heating and air conditioning installation or repair in the city requires a certificate of competency, which is how the code refers to the license.
- There are four HVACR license levels, master (Type A) at the top and apprentice (Type C) at the bottom. A master needs 12,000 hours of experience and an exam; a journeyman needs 8,000 hours and an exam.
- Contracting for the work is reserved to masters. Journeymen work under a master, and apprentices under the direct supervision of a master or a journeyman.
- A licensed master mechanic files the permit application and may not lend the license to anyone else for that purpose.
- The owner of a single-family house who lives there can get a permit for their own home, provided they buy the materials and do the work personally.
Source: City of Columbia Code of Ordinances, Chapter 6, Article V (file dated December 2, 2025), and the city's Board of Mechanical Examiners page. Licensing now sits with the community development director under the code, and the board is shown as inactive.
What the permit does for you
A permit brings a city inspection, and City of Columbia Utilities won't pay its rebate without the final mechanical permit. Ask whether the permit is in the quoted price and who books the inspection.
Beyond city limits
Missouri has no statewide license for HVAC contractors. SB 957, a 2026 bill that would have created a statewide mechanical contractor license, went to committee and had not become law when we last checked. In Ashland, Hallsville, Sturgeon, Boonville, Fayette or unincorporated Boone County, ask the company whether a local permit applies, and ask to see its insurance.
One federal rule that applies everywhere
Under Section 608 of the Clean Air Act, EPA requires certification for any technician servicing equipment that could release refrigerant. City or county makes no difference. Asking to see the certification card is reasonable.
What Boone County homeowners ask us
Does an HVAC contractor need a license to work in Columbia, MO?
Inside city limits, yes. The city's mechanical code requires a City of Columbia license for heating and cooling installation and repair, and only a licensed master mechanic may contract for the work and file the permit.
Is there a Missouri state HVAC license?
No. Licensing in Missouri is local. Proposals for a statewide license, such as SB 957 in 2026, have not passed.
Am I allowed to replace my own AC in Columbia?
The city will permit an owner-occupant to do the work on their own single-family home if they buy the materials and do the labor. Anyone handling refrigerant still needs EPA Section 608 certification.
Sources
- City of Columbia Code of Ordinances, Chapter 6, Article V, Mechanical Code, Sec. 6-60 and 6-61 (file dated December 2, 2025)
- City of Columbia: Board of Mechanical Examiners page (accessed October 29, 2026)
- Missouri SB 957 (2026), Missouri Statewide Mechanical Contractors Licensing Act, bill status
- US EPA: Section 608 Technician Certification (updated March 3, 2026)
- City of Columbia Utilities: Air Conditioner and Heat Pump Rebates (accessed October 29, 2026)