Replacing a furnace, air conditioner or heat pump in Boone County means dealing with one of two very different systems. The City of Columbia enforces the 2018 International Mechanical Code and requires that mechanical work be performed by a mechanic it licenses. Unincorporated Boone County requires a building permit for HVAC work but, by state statute, cannot license contractors. And Missouri has no statewide HVAC license at all — this is entirely a municipal matter.
What code does Columbia enforce?
Columbia has adopted the 2018 International Mechanical Code, incorporated into the city code as Chapter 6, Article V. The ordinance language on who may do the work is direct:
"All mechanical work must be performed by a mechanic licensed by the City of Columbia, or as allowed by ordinance."
That is a requirement placed on the person doing the work, not merely on the paperwork. It is also the reason a company operating legitimately in one Missouri city may have nothing on file in another — there is no state credential that carries across.
Who can pull a mechanical permit in Columbia?
A permit applicant needs two things: a City Contractor License and a Master Trade License. Permits themselves are filed online through the city's EnerGov Citizen Self Service portal.
| License class | Type | What it covers |
|---|---|---|
| Master Mechanic | Type A | Carries contracting authority — the class a company needs behind a permit application |
| Journeyman | Type B | Trade-level mechanical work |
| Chimney Sweep | Type D | Chimney work |
One detail worth knowing if you go looking for the old process: the city's page states plainly that the Board of Mechanical Examiners is no longer active. Licensing and permit questions now go to Building & Site Development — 573-874-7474, Building@CoMo.gov, 701 E. Broadway. That office is the authority on your specific job, and it is the right place to verify anything a contractor tells you about a permit.
What about unincorporated Boone County?
Here is the contrast almost nobody explains. Outside the municipalities, a permit is still required — the county lists "HVAC installation or upgrade" among the work that needs a building permit. But the county has no authority to license the person doing it:
"According to State Statute, Boone County is not allowed to license General Contractors."
So in the county the permit exists without a county contractor license behind it — not because standards are lower, but because the statute withholds that power from county government (more on how this plays out). Boone County adopted the 2015 I-codes, effective April 1, 2017. Questions go to Resource Management at (573) 886-4330, and inspections to (573) 886-4339.
| City of Columbia | Unincorporated Boone County | |
|---|---|---|
| Permit required? | Yes | Yes — HVAC installation or upgrade is listed |
| Licenses the contractor? | Yes — City Contractor License + Master Trade License | No — barred by state statute |
| Code adopted | 2018 International Mechanical Code (Ch. 6, Art. V) | 2015 I-codes (effective 4/1/2017) |
| Who to call | Building & Site Development, 573-874-7474 | Resource Management, (573) 886-4330 |
This matters most for homes just outside the line and for the county's towns. If you are in Hartsburg, Harrisburg or on acreage between Ashland and Columbia, a call to Resource Management before the work starts takes two minutes and settles the question for good.
Why the permit is worth real money
A final mechanical permit is one of the four documents required to claim the Columbia Water & Light rebate. Skip the permit and there is no final permit to submit — and the rebate, worth up to $1,200 on a qualifying heat pump, air conditioner or geothermal system, is simply gone. The city's own rebate guidance notes that these permits are "usually obtained by the contractor."
That single sentence is the practical argument for caring who you hire. Full detail on the amounts and deadlines is on our Columbia rebate page; out in co-op territory, the Boone Electric programs work differently. Either way, permitted work is what a future buyer's inspector, and your own insurer, expect to find.
What certification does the technician need to touch refrigerant?
Separately from any city license, handling refrigerant requires federal EPA Section 608 certification. There are four categories:
| Type | Covers |
|---|---|
| Type I | Small appliances |
| Type II | High-pressure equipment — residential split systems and heat pumps |
| Type III | Low-pressure equipment |
| Universal | All types; requires a proctored core exam |
Type II is the one that matters for a typical Columbia home — the split system behind an A/C repair or a heat pump installation. Section 608 certifications do not expire.
What this page deliberately doesn't tell you
Permit fees, the exact list of jobs that trigger a permit, whether a given repair is exempt, which inspections are required and how they are scheduled — all of it is set by the jurisdiction and revised over time. Publishing a number that later changes helps nobody, so we don't. Call the office instead:
- Inside Columbia: Building & Site Development, 573-874-7474 · Building@CoMo.gov · 701 E. Broadway
- Unincorporated Boone County: Resource Management, (573) 886-4330 · Inspections (573) 886-4339
- Rebate questions: Columbia Water & Light efficiency staff, 573-441-5528
We handle permitting as part of the job on replacements — furnace installations, A/C installations and heat pump changeouts alike — from East Campus to Vanderveen Crossing and out across the county.
Frequently asked questions about HVAC permits in Columbia
Who is allowed to do mechanical work inside Columbia city limits?
The city ordinance states that all mechanical work must be performed by a mechanic licensed by the City of Columbia, or as allowed by ordinance. To apply for a permit, a company needs a City Contractor License together with a Master Trade License. Questions about a specific job or a specific company's standing go to Building and Site Development at 573-874-7474.
Does unincorporated Boone County require an HVAC permit?
Yes. The county lists HVAC installation or upgrade among the work that requires a building permit. What the county cannot do is license the contractor: its own guidance states that according to State Statute, Boone County is not allowed to license General Contractors. Permit questions go to Boone County Resource Management at (573) 886-4330, and inspections at (573) 886-4339.
Does Missouri have a statewide HVAC license?
No. Missouri does not issue a statewide HVAC or mechanical contractor license. Regulation is entirely municipal, which is why requirements change at a city limit line and why a company's standing in one jurisdiction says nothing about another.
How are Columbia mechanical permits filed?
Permits are filed online through the city's EnerGov Citizen Self Service portal. The Board of Mechanical Examiners is no longer active, and license applications are handled by Building and Site Development, 701 E. Broadway, reachable at 573-874-7474 or Building@CoMo.gov.
Can skipping the permit cost me money?
Yes, directly. A final mechanical permit is one of the documents required to claim the Columbia Water and Light rebate on a new system. No permit means no final permit to submit, which means no rebate — a loss of up to $1,200 on a qualifying heat pump, air conditioner or geothermal installation.
What is EPA Section 608 certification?
It is the federal certification required to handle refrigerants. Type I covers small appliances, Type II covers high-pressure equipment such as residential split systems and heat pumps, and Type III covers low-pressure equipment. Universal certification covers all types and requires a proctored core exam. Section 608 certifications do not expire.
What does a permit cost and which jobs need one?
Fee schedules and the specific list of work that triggers a permit are set by the jurisdiction and change over time, so the reliable answer comes from the office itself rather than from a contractor's website. For work inside Columbia, call Building and Site Development at 573-874-7474. For unincorporated Boone County, call Resource Management at (573) 886-4330.