Connecticut licenses contractors through the Department of Consumer Protection (DCP), which maintains one of the broadest licensing datasets of any state this site covers — a single dataset spanning essentially every credential DCP regulates. Electrical, plumbing, and HVAC/mechanical work are all real, exam-backed, business-level licenses in Connecticut: 'Electrical Unlimited/Limited Contractor,' 'Plumbing & Piping Unlimited/Limited Contractor,' and 'Heating, Piping & Cooling Unlimited/Limited Contractor' or 'Mechanical Contractor' respectively.
Roofing works differently in Connecticut: there's no separate, trade-tested roofing license at all. Roofing and general contracting work falls under the broad 'Home Improvement Contractor' registration, which covers a wide range of home improvement work without a roofing-specific exam behind it. This is why Connecticut roofing/general listings on this site are tagged 'Registered' rather than 'Licensed' — an accurate reflection of what the state actually tests for that category, not a lesser credential in some general sense.
The 'Unlimited' versus 'Limited' distinction within Connecticut's electrical, plumbing, and HVAC licenses is also worth knowing: it typically reflects the scope or complexity of work a contractor is licensed to perform, not just a naming quirk. Both are real tested credentials — the difference is scope, similar in spirit to Virginia's Class A/B/C system, just structured differently.
DCP's data is fully live and covers all four trade categories this site tracks for Connecticut, refreshed on a recurring schedule. Status categories — active, expired, revoked, pending — reflect DCP's own current records at the time of the last refresh.
To verify any Connecticut contractor directly, DCP runs its own eLicense lookup tool searchable by name or license number — worth using directly before a larger project, and especially useful for confirming whether a contractor's Unlimited or Limited designation actually covers the scope of work you need.
For home improvement/roofing work specifically in Connecticut, since the registration alone doesn't reflect a trade-specific exam, it's worth applying the same extra diligence recommended elsewhere on this site for 'Registered' listings: ask for references and photos from comparable projects, and confirm current insurance directly rather than assuming the registration alone covers it.