Tree service license in Connecticut

Connecticut requires a state license for at least some tree work. Under Connecticut General Statutes section 23-61b, no person may advertise, solicit or contract to do arboriculture (tree care for hire, such as pruning, treating and caring for trees) in the state without an arborist license. People working on trees on their own or their employer's property are exempt, as long as they follow pesticide rules. A license lasts five years. A company that offers tree care for hire must also hold an arborist business registration (section 23-61h), and each place of business must employ at least one licensed arborist (section 23-61j). The license is handled by the Department of Energy and Environmental Protection (DEEP) Pesticide Management Program. Our source quotes the statutes as current through the 2014 session, so confirm current rules and fees with DEEP. Checked 25 October 2026. Short explanation, not legal advice.

A licensed Connecticut arborist is treated as a certified pesticide applicator under section 23-61b(h). A registered arborist business does not need a separate pesticide business registration under section 22a-66c (section 23-61h(d)). Confirm current pesticide rules with DEEP. Confirm the exact license category with the Connecticut pesticide program before you spray or inject trees for pay.

We could not confirm whether any other state contractor registration applies to tree work in Connecticut. Check with the state and your city before you start. Check with the licensing board if a job is large or includes other construction work.

Towns may have their own tree wardens, permits for trees on public land or roadsides, and tree ordinances, so check with the town before working near streets or public trees. Check with the city or county where each job is, not only where your shop is.

Clients and towns often ask for proof of general liability insurance, and employers generally need workers' compensation; talk to a licensed insurance agent about what fits your company. Talk with a licensed insurance agent who knows tree work. General information, not insurance advice.

We checked them on 25 October 2026 and linked 1 official source on this page. Rules, fees and websites change, so confirm with the agency before you bid or work.