STATE LICENSE
RequiredConnecticut Department of Consumer Protec…
Heating, piping and cooling work, including sheet metal ductwork, is licensed under CGS chapter 393 by DCP with the Heating, Piping, Cooling and Sheet Metal Work Board (§ 20-330(5), (13)). The S-1 contractor may do all such work; limited contractor licenses include D-1 (warm air, air conditioning and refrigeration, including gas piping), D-3 (cooling only), S-3 (heating, boilers and steam), B-1/B-3 (gas and oil burners), and G-1 (gas piping and appliances). Contractor licenses require two years as a licensed journeyperson or equivalent experience.
HVAC licenses expire every August 31. Fees match the other trades: $150 contractor and $120 journeyperson, with $150 and $90 application fees. Technicians who handle refrigerants also need federal EPA Section 608 certification. Chapter 393's continuing-education mandate (§ 20-334d) covers electricians and plumbers, not heating and cooling licensees.
The state sets the license floor; the county or city permit office controls filing, inspections, and local rules wherever the job site sits.
Licensing is exclusively state (DCP); towns and cities issue mechanical permits and inspect. A licensed contractor signs the permit application (§ 20-338b).
The local offices section below names the exact permit desk for every Connecticut 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 D-1 covers AC, refrigeration, and warm air with gas piping but not oil burners; a D-3 covers cooling only with no gas; burner work needs a B license.
Sheet metal ductwork is licensed work; DCP limited sheet metal licenses SM-2, SM-4, and SM-6 cover it for journeypersons.
Registered home improvement and new home contractors may do kitchen/bath exhaust, dryer vents, radon vents, chimneys, and stand-alone stoves in buildings of six units or fewer without a sheet metal license (§ 20-340(16)).
A practical sequence for a new HVAC contractor in Connecticut. 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.
Wilfully performing, advertising, or employing others for licensed trade work without the license is a crime once DCP determines in writing that the work requires a license.
The examining board or the DCP commissioner may fine each violation after a hearing; half goes to the town when its building official reported it.
Since P.A. 25-111, DCP may issue a notice of violation after an inspection and then a stop-work order; ignoring it draws a daily fine.
Inside city limits, the city office listed here issues the permit; the county office serves unincorporated areas. Every office links to its official page.
| County · City | Permit office | Portal |
|---|---|---|
| Fairfield County Bridgeport (consolidated gov.) | City of Bridgeport Building Department ↗ | Park City Portal ↗ |
| Hartford County Hartford (consolidated gov.) | City of Hartford Department of Development Services — Licenses and Inspections ↗ | Accela Citizen Access (Hartford) ↗ |
| New Haven County New Haven (consolidated gov.) | City of New Haven Office of Building Inspection & Enforcement ↗ | City Squared Electronic Permitting ↗ |
Every fact in this file was checked against these official sources on October 2026.
Pending verification: Exam vendor and exam fee for ch. 393 trade exams (DCP says separate fees are due to the exam vendor at registration but does not state them) · Whether DCP regulation imposes continuing education on heating, piping, and cooling licensees (none in § 20-334d; regulations not retrieved) · Whether any 2026 regular-session public act changed these fees, thresholds, or insurance minimums — the newest statutory text retrieved is the 2026 Supplement, which reflects only the 2025 session
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.