STATE LICENSE
RequiredIowa Plumbing and Mechanical Systems Boar…
Iowa Code § 105.10 covers 'mechanical, HVAC, refrigeration, sheet metal, or hydronic systems' alongside plumbing: no one may install or repair them, or operate as a contractor, without a Plumbing and Mechanical Systems Board license. A mechanical license covers HVAC, refrigeration, sheet metal, and hydronic work; an HVAC-refrigeration license covers HVAC and refrigeration; separate hydronic and sheet-metal licenses exist (§ 105.18(2)).
The contractor license requires a master (or employing one), a permanent place of business, workers' comp and unemployment insurance compliance, liability insurance and a surety bond (DIAL lists $500,000 and $5,000), and it doubles as chapter 91C registration. Master and journeyperson mechanical or HVAC-refrigeration licensees don't need a special electrician license to disconnect and reconnect existing air-conditioning and refrigeration systems (§ 105.18(3)(d)). Technicians handling refrigerants also need federal EPA Section 608 certification.
The state sets the license floor; the county or city permit office controls filing, inspections, and local rules wherever the job site sits.
State licensing is exclusive: § 105.17 voided local mechanical licensing in 2009 and bars local governments from blocking state licensees. Mechanical permits and inspections stay with cities and counties.
The local offices section below names the exact permit desk for every Iowa county on file.
Each row names the issuing authority, cost, timeline, citation, and status behind the requirement — verified against the official source.
Published fees from the issuing authorities, as of October 2026. Local permit fees vary by project and jurisdiction — the basis is stated where a flat number does not exist.
A master or journeyperson mechanical licensee needs no separate HVAC-refrigeration, sheet metal, or hydronic license, nor any restricted sublicense of those (§ 105.10(3)).
Mechanical and HVAC-refrigeration licensees may disconnect and reconnect existing AC and refrigeration systems without a special electrician license (§ 105.18(3)(d)). New circuits still need an electrician.
All PMSB licenses share the July 1, 2026–June 30, 2029 term and the same late-fee ladder.
A practical sequence for a new HVAC contractor in Iowa. Actual agency processing times are noted in the ledger above.
Each item names the issuing authority, cycle, and citation.
Statutory consequences with their citations — not estimates, not “commonly cited” guesses.
Board civil penalty for violating chapter 105; each day of continued violation is a separate offense.
Fraudulently claiming licensure or misusing a license number in advertising.
Inside city limits, the city office listed here issues the permit; the county office serves unincorporated areas. Every office links to its official page.
Every fact in this file was checked against these official sources on October 2026.
Pending verification: The $500,000 liability and $5,000 bond minimums come from DIAL's PMSB page; § 105.19 delegates the amounts to board rule, which we did not retrieve as text · Whether the PMSB rules require more than the statutory minimum of 8 CE hours per term for mechanical licensees
General information, not legal advice. Always confirm requirements, deadlines, and forms with the issuing authority before filing or contracting.
Store licenses, permits, policies, and renewal dates in one place.