Quick answer: Connecticut regulates trades through the Department of Consumer Protection (DCP). The mechanical trades – plumbing (P-1), electrical (E-1) and heating/cooling/HVAC (S-1) – require a true state occupational license earned through apprenticeship and a state exam. Most other residential work – roofing, siding, painting, carpentry and general handyman remodeling – does not require a competency license but does require a Home Improvement Contractor (HIC) registration with DCP. Building new homes requires a separate New Home Construction Contractor registration. Landscapers and cleaners need no state trade license, though tree/arborist work is licensed separately by DEEP.
The table below shows which of the common trades need a Connecticut state license or registration and which do not.
Which trades need a license in Connecticut?
| Trade | State license required? | Licensing body |
|---|---|---|
| Plumber | Yes | State occupational license required – DCP issues the P-1 unlimited plumbing contractor and P-2 journeyperson licenses under the mechanical-trades statute (Conn. Gen. Stat. Ch. 393). |
| Electrician | Yes | State occupational license required – DCP issues the E-1 unlimited electrical contractor and E-2 journeyperson licenses. Only contractors may contract with consumers and pull permits. |
| HVAC | Yes | State occupational license required – DCP issues Heating, Piping & Cooling licenses (S-1 unlimited contractor, S-2 journeyperson, plus limited B, D and G gas/oil/refrigeration classes) and sheet metal (SM) licenses. |
| General Contractor | Registration | No single "GC license." Residential remodeling requires a Home Improvement Contractor registration; building new homes requires a New Home Construction Contractor registration – both through DCP. |
| Roofer | Registration | No competency license, but a DCP Home Improvement Contractor (HIC) registration is required to contract for residential roofing work. |
| Painter | Registration | No competency license, but residential painting is home improvement – a DCP Home Improvement Contractor (HIC) registration is required to contract with homeowners. |
| Carpenter | Registration | No competency license, but residential carpentry, remodeling, decks, doors and windows are home improvement – a DCP Home Improvement Contractor (HIC) registration is required. |
| Landscaper | Registration | No state landscaping trade license. Residential landscaping is home improvement and needs a DCP HIC registration. Tree/arborist work requires a separate DEEP arborist license. |
| Handyman | Registration | No competency license, but a handyman doing residential home-improvement work must hold a DCP Home Improvement Contractor (HIC) registration. Individual contracts under $200 are excluded. |
| Cleaner | No | No state occupational license or registration required for residential or commercial cleaning. |
"Yes" means a DCP occupational license (state exam) is required; "Registration" means a DCP Home Improvement Contractor or New Home Construction registration is required but no competency exam; "No" means no state credential. All trades may still need local permits and insurance.
How Connecticut licenses trades
Connecticut regulates the building trades primarily through the Department of Consumer Protection (DCP). Unlike some states, Connecticut draws a sharp line between two very different credentials. A handful of mechanical trades – plumbing, electrical, and heating/piping/cooling (HVAC), along with sheet metal, fire protection and a few others – require a true occupational license. These are earned through a documented apprenticeship, then a state examination, and are issued in tiers: an unlimited contractor license (E-1, P-1, S-1) that can contract with the public and pull permits, and a journeyperson license (E-2, P-2, S-2) that works under a contractor.
Nearly everything else in residential construction – roofing, siding, painting, carpentry, remodeling, decks, flooring and general handyman work – is not tied to a competency exam. Instead, anyone who contracts with a homeowner for that work must hold a Home Improvement Contractor (HIC) registration. Registration is a consumer-protection credential, not a skills test.
The state-licensed mechanical trades
The trades that require a genuine DCP occupational license are the mechanical trades defined in Connecticut's licensing statute. Plumbers hold P-class licenses (P-1 unlimited contractor, P-2 journeyperson, plus limited J, PP and SP classes for water, process piping and pools). Electricians hold E-class licenses (E-1 unlimited contractor, E-2 journeyperson, plus limited low-voltage, solar and telecom classes). HVAC falls under "Heating, Piping & Cooling": S-1 is the unlimited contractor and S-2 the journeyperson, while limited classes cover specific scopes – B for gas and oil burners, D for warm-air and refrigeration, and G for gas piping; sheet-metal ductwork is licensed separately under SM classes.
For these trades, hiring an unlicensed person for reserved work is illegal and can void permits and insurance. A Home Improvement registration does not authorize plumbing, electrical or HVAC work – that always requires the matching occupational license.
Home Improvement Contractor registration
Most residential trades fall under the Home Improvement Contractor (HIC) program. Connecticut defines "home improvement" broadly to include any permanent change to residential property – roofs, siding, painting, driveways, porches, garages, insulation, flooring, patios, landscaping, fences, doors and windows, and waterproofing. If you contract with a homeowner for that work, you must be registered with DCP before advertising or starting the job.
HIC registration is a registration, not a competency license: there is no trade exam. Applicants apply online, carry general liability insurance of at least $20,000, and pay a registration fee (about $220), renewing annually. Very small jobs – individual contracts under $200 – and work performed on the contractor's or homeowner's own property fall outside the definition, and licensed mechanical trade work is covered by its own occupational license instead.
New home construction and general contracting
Connecticut has no single "general contractor" license. Which credential a GC needs depends on the work. To remodel or improve existing homes, a contractor registers as a Home Improvement Contractor. To build new single-family homes for sale, a contractor must instead hold a separate New Home Construction Contractor registration with DCP, and can designate home-improvement work as part of that registration.
Neither registration lets the GC self-perform licensed mechanical work – the plumbing, electrical and HVAC scopes on a job must be handled by appropriately licensed P-1, E-1 or S-1 contractors and their journeypersons.
Trades with no state credential (and the arborist exception)
A few common services need no state trade license at all. Cleaning – residential or commercial – is unregulated at the state level. General landscaping and lawn care has no dedicated state trade license, though residential landscaping still counts as home improvement and therefore needs an HIC registration.
The important exception is tree work. Anyone who advertises, solicits or contracts to do arboriculture – pruning, treating or removing trees and shrubs – must hold a Connecticut Arborist License issued by the Department of Energy & Environmental Protection (DEEP), not DCP. That license requires passing a written and oral examination. Being unlicensed never means unregulated: these businesses still need appropriate insurance and cannot cross into a licensed mechanical trade.
How to get licensed in Connecticut
- Identify whether your work is a licensed mechanical trade (plumbing, electrical, HVAC/sheet metal) or general residential home improvement (roofing, siding, painting, carpentry, etc.).
- For a mechanical trade, complete a registered apprenticeship and log the required hours, then apply to DCP to sit for the state exam and earn a journeyperson (E-2, P-2, S-2) and later an unlimited contractor (E-1, P-1, S-1) license.
- For residential remodeling, apply online to DCP for a Home Improvement Contractor registration – or a New Home Construction Contractor registration if you build new homes – and carry at least $20,000 general liability insurance.
- Submit your DCP application through the state eLicense portal (elicense.ct.gov) with the required fees, insurance certificate and any exam results, and wait for approval before advertising or starting work.
- Keep your license or registration current by renewing on schedule (HIC registrations renew annually) and completing any continuing-education required for your trade, plus any local permits for each job.
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Frequently asked questions
Does a handyman need a license in Connecticut?
A handyman does not need a competency license, but if they contract with homeowners for residential home-improvement work they must hold a Home Improvement Contractor (HIC) registration with the Department of Consumer Protection. Only very small jobs – individual contracts under $200 – fall outside the definition. A handyman still cannot perform licensed plumbing, electrical or HVAC work, which requires the matching occupational license.
What is the difference between a license and a registration in Connecticut?
An occupational license (plumbing P-1, electrical E-1, HVAC S-1) is earned through an apprenticeship and a state exam and certifies competency in a mechanical trade. A Home Improvement Contractor registration is a consumer-protection registration with no trade exam – it requires insurance and a fee, and covers residential work like roofing, siding, painting and carpentry.
Do roofers and painters need a state license in Connecticut?
Not a competency license, but yes to a registration. Residential roofing and painting are "home improvement" under Connecticut law, so contractors must hold a Home Improvement Contractor registration with DCP before contracting with homeowners. There is no separate skills exam for these trades.
Do landscapers and cleaners need a license in Connecticut?
Cleaners need no state trade license or registration. Landscapers have no dedicated state trade license either, but residential landscaping counts as home improvement and needs a DCP Home Improvement Contractor registration. Tree and shrub care (arboriculture) is different – it requires a Connecticut Arborist License from DEEP.
Sources: CT DCP – Careers in the Trades: License Types, CT DCP – Heating, Piping and Cooling License Types and Scope of Work, CT DCP – Home Improvement, CT DCP – Home Improvement Applications, CT DCP – Home Improvement for Consumers, 2025. Licensing rules change — always confirm current requirements with the relevant state board and your local city before you work.