How to Start an HVAC Business in Connecticut: S-1 Contractor License

If you plan to run a heating and cooling company in Connecticut, the license that matters most is the DCP S-1 unlimited heating, piping and cooling contractor license. This guide covers what the S-1 requires, what it costs, and how the business entity, tax registrations and local approvals fit around it. If you searched for a connecticut hvac license or hvac license connecticut, this is the order in which the paperwork usually has to happen.

Connecticut has no general state business license. The state licenses trades one at a time. Your HVAC license comes from the Department of Consumer Protection (DCP). Your business registration comes from the Secretary of the State through Business.CT.gov. A registration is not a license, and a sales tax permit is a tax registration. Keeping those three things separate makes the process much easier to follow.

What You Need Before You Start

Gather these items before you file anything. Most delays come from missing paperwork, not from the exam itself.

• Proof of experience. Employer verification letters, dated job logs, and any journeyperson license records that show your hours and trade classification.
• Training records. If you use the equivalent-experience route, documentation of classroom hours from your training program.
• Identification and contact details. A government-issued photo ID, plus a current mailing address and email address for the DCP application.
• Application and exam fees. The DCP application fee is $150 for a contractor and $90 for a journeyperson. Exam vendor fees are separate, so budget for them on top of the application fee.
• EPA refrigerant certification. This is a separate federal requirement, not part of the state license. Check the EPA's current certification options before you schedule your exam.
• Entity formation documents. If you form an LLC, you need a Certificate of Organization, a registered agent with a Connecticut business address, and a federal EIN from the IRS.
• Trade name paperwork. Only if you will operate under a name other than your legal name.

Step 1: Match Your Experience to the Right License Class

Start by deciding which class fits the work you want to sell. The S-1 is the unlimited heating, piping and cooling contractor license. The S-2 is the unlimited journeyperson license. Narrower classes exist for specific work:

• S-3 and S-4: limited heating, cooling and piping, including boilers and steam.
• B-1 to B-4: gas and oil burner work.
• D-1 to D-3: warm air systems.
• Air conditioning and refrigeration and SM sheet metal licenses.

The S-1 covers the broadest scope. A limited class can be a better fit if your experience is narrow, but confirm with DCP that the class covers every type of job you plan to bid.

Step 2: Confirm You Meet the Experience Requirement

For the S-1, DCP requires two years as a licensed journeyperson or equivalent experience. The S-2 journeyperson license is based on a registered apprenticeship or equivalent training.

If you are not a licensed journeyperson, DCP's equivalent-experience route for the S-1 is 576 classroom hours plus 12,000 on-the-job hours. DCP's equivalent-experience chart also lists an alternative of 8,000 on-the-job hours plus two years of experience. Confirm the exact combination you need with DCP before you count on either path.

Keep a dated log of hours from the first day you start counting. A log with clear dates, employer names and job types is far easier to verify than a summary written from memory months later.

Step 3: Submit Your DCP Application

DCP licenses individuals, not companies. The person who passes the exam and holds the license is the licensed individual, even if the business uses a different name. Your application goes to DCP, and you pay the $150 contractor fee (or $90 if you are applying as a journeyperson). Ask DCP for its current processing time before you plan an opening date.

Step 4: Schedule and Pass the Exam

After DCP accepts your application, schedule your exam through the exam vendor and pay the vendor fee separately. Ask DCP for the current exam content outline and study from it, not from older practice material. Exam content and vendors can change, so confirm both before you book.

Complete your EPA refrigerant certification as well. You need it to handle refrigerant on the job, so plan to finish it before you start servicing refrigeration or air conditioning systems.

Step 5: Form Your Business Entity

Your business entity is a registration with the Secretary of the State, separate from your DCP license. For an LLC, file a Certificate of Organization through Business.CT.gov at business.ct.gov. The filing fee is $120.

Your LLC name must include "Limited Liability Company" or an abbreviation such as "LLC" or "L.L.C." It must also be distinguishable from names already on the record. Check availability free with the Business.CT.gov business search before you file. If you need time to file, a name reservation costs $60 and lasts 120 days.

Expedited service costs $50 per transaction and is completed within 24 hours, but it is available only for online filings. The state says most online filings are accepted automatically, so expedited service is usually unnecessary. It does not publish a standard turnaround for ordinary online or paper filings.

Every Connecticut LLC must appoint a registered agent. The agent must be either a Connecticut resident at least 18 years old or a business entity registered with the Secretary of the State. The agent's address must be a usual place of business in Connecticut that is open during normal business hours with an authorized person present. A post office box or commercial mailbox does not qualify.

The LLC also owes an Annual Report of $80 every year. Business.CT.gov shows each entity its own due date in its account. For LLCs, the widely reported practice is a January 1 to March 31 window, but check your account for the date that applies to you.

If you form a corporation instead, the Certificate of Incorporation fee is $250 and the Annual Report is $150. Most small HVAC owners choose an LLC, but ask a CPA which structure fits your situation.

Step 6: Register for Taxes

Connecticut has no franchise tax or annual privilege tax on LLCs. An LLC taxed as a partnership or S corporation may elect the optional Pass-Through Entity Tax with the Department of Revenue Services (DRS). The election is annual and irrevocable for that year. An LLC treated as a corporation pays the Corporation Business Tax, which is 7.5% of apportioned net income with a $250 minimum, plus a capital base tax that is being phased out. Ask a CPA which of these applies to you.

If you sell taxable goods or services, you must obtain a Sales and Use Tax Permit from DRS. The permit carries a $100 registration fee, and you must display it at each location. Ask DRS whether your specific HVAC services and parts sales are taxable. The state sales tax rate is 6.35%. Apply through the Department of Revenue Services site.

Step 7: Clear Local Approvals

Connecticut does not have county government, so your local approvals come from your town or city. Check these before you advertise or open for business:

• Zoning. If you run the business from home or a shop, confirm the rules with your town's planning and zoning office. Home occupation rules vary by town.
• Trade name certificate. If you operate under a trade name, file the certificate with the town clerk in the town where the business is primarily transacted, not with the state. The fee is $20.
• Local permits. Zoning, health and occupancy permits may apply. Check with your town building department and your local health department or district about any requirements for your work.

Step 8: Arrange Insurance and Records

Insurance costs and minimums vary, so speak with an insurance agent before you take your first job. Ask about general liability coverage and, if you will have employees, workers' compensation. Requirements and premiums vary by business. Keep your license, entity filings, permit and insurance documents in one place so you can produce them quickly when a customer or inspector asks.

Step 9: Calendar Your Renewals

Heating, cooling and sheet metal licenses expire annually on August 31. Renewal costs $150 for a contractor and $120 for a journeyperson, based on DCP's 2026 figures. Before you renew, ask DCP whether any continuing education applies to your license, because this guide does not cover that requirement. Put the August 31 deadline on your calendar, then add your LLC Annual Report date from Business.CT.gov and your DRS filing dates.

Tips for Getting It Right the First Time

• Verify your hours with former employers before you apply, while they still have the records.
• Check name availability and reserve it before you spend money on signs, trucks or a website.
• Pay your exam vendor and EPA certification costs in the same budget as the DCP fee so none of them surprise you.
• Keep one folder, digital or paper, with every confirmation number, receipt and filed document.

Common Mistakes to Avoid

• Treating the LLC as the license. The state registration does not authorize HVAC work. Only the individual DCP license does.
• Filing the trade name with the state. Trade name certificates go to the town clerk.
• Using a post office box as the registered agent address. It does not qualify.
• Forgetting the August 31 renewal. A lapsed license means you are no longer licensed for covered work.
• Assuming an expedited filing is faster for every case. Expedited service is for online filings only and is usually unnecessary.
• Counting hours you cannot prove. Undocumented experience is hard to verify and can delay your application.

What to Expect

If you follow these steps in order and keep clean records, you may be able to move from application to exam to a licensed business without major rework. Timelines depend on how quickly your documents are verified, how soon exam dates open and how fast your town reviews local approvals, so build in extra time. Ask DCP and your town office for their current timing before you set a launch date.

Disclaimer

This article is general information, not legal or tax advice. Connecticut license rules, fees, deadlines and filing requirements change. Confirm the current requirements with the Department of Consumer Protection, the Secretary of the State through Business.CT.gov, the Department of Revenue Services, and your town clerk and planning office before you act. For complex situations, including choosing an entity structure, handling payroll, or planning for multiple licenses, consult a qualified Connecticut attorney or CPA.