Connecticut renewal guide
Solar Thermal Contractor (ST-1)
If this license is up for renewal, this page gives you the fee, the timeline, and the items that usually hold the filing up.
Start here
What matters before you file.
Check the fee, the renewal window, and the documents or insurance records that can slow approval down.
Issuing authority
Renewal period
Every 12 months
Renewal fee
$150.00
Bond requirement
No
Insurance requirement
Yes — General Liability, Workers' Compensation
Before you renew
Get the filing straight.
- 1
Check the insurance certificates
Make sure the required policies are current and match what the board or agency expects before you file.
- 2
File with the board
File through Connecticut Department of Consumer Protection (DCP) and pay the $150.00 renewal fee once the supporting proof is ready.
Renew online
Detailed notes
The fine print is here.
Connecticut Solar Thermal Contractor License (ST-1)
The Connecticut Department of Consumer Protection (DCP) issues the ST-1 Solar Thermal Contractor license, which authorizes the holder to install, repair, replace, and maintain solar thermal systems. This license is administered by the Heating, Piping, Cooling, Sheet Metal and Solar Work Examining Board.
What This License Authorizes
ST-1 license holders may perform, supervise, and contract for solar thermal system installations, including solar hot water heaters, solar pool heating systems, and other solar thermal collectors and associated piping and storage systems.
Examination and Experience Requirements
Applicants must pass written examinations administered by the DCP covering solar thermal system design, installation, and Connecticut regulations. Applicants must have at least two years of experience as a licensed solar journeyperson or equivalent experience and training in solar thermal systems.
Continuing Education
Connecticut does not currently require continuing education for Solar Thermal license holders.
Renewal Process
- Renewal Period: Annually
- Renewal Fee: $150
- Renew Online: Through the eLicense portal at elicense.ct.gov
Consequences of Operating Without a License
Performing solar thermal work without a valid DCP license is a Class B misdemeanor in Connecticut, punishable by up to six months in prison, a fine of up to $1,000, or both.
*Disclaimer: This information is provided for general reference only and does not constitute legal advice. Always verify current requirements directly with the Connecticut Department of Consumer Protection.*
Official links
Check the board or agency directly.
Required documents
- Proof of Insurance
- exam_results
- experience_verification
Source notes
Connecticut Department of Consumer Protection . Verified March 2026. https://portal.ct.gov/dcp/license-services-division/all-license-applications/solar-energy-work
Rules move. Check Connecticut Department of Consumer Protection (DCP) again before you pay, renew, or schedule work around this requirement.
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Next steps
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Printable checklist
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