How to Start a Tree Service Business in Connecticut: DEEP Arborist License
How to Start a Tree Service Business in Connecticut: DEEP Arborist License
If you want to start a tree service business in Connecticut, the first license you need does not come from the Secretary of the State or your town. It comes from the Department of Energy and Environmental Protection (DEEP). Under Connecticut General Statutes 23-61 to 23-61b, you need a DEEP arborist license before you advertise, solicit or contract for tree care for hire. This guide covers the steps in the order that keeps you from paying for filings you cannot yet use: form the business, pass the DEEP exams, register the business with DEEP, then put insurance, tax registrations and local approvals in place before your first bid.
This is informational content, not legal or tax advice. Fees, exam dates and rules change. Confirm every figure below with the agency named in that step before you pay or book anything. For decisions about your entity structure, taxes, contracts or liability, consult a qualified attorney or CPA.
Know which agency issues what
Connecticut has no general state business license. A tree service needs paperwork from several places, and mixing them up is the most common early mistake:
- Entity filing with the Connecticut Secretary of the State, Business Services Division, through Business.CT.gov. This registers your business. It is not a license.
- Trade licensing by DEEP for tree care. Other trades answer to agencies such as the Department of Consumer Protection and the Department of Public Health.
- Tax registration with the Connecticut Department of Revenue Services (DRS).
- Local approvals from your town or city, such as zoning and permits for work on public property. Connecticut has no county government, so there is no county license, county clerk or county health department to deal with.
Materials and checklist before you start
You do not need much equipment to begin the paperwork, but gather these items first so the filings and exam preparation do not stall:
- A business name you have checked against the free Business.CT.gov business records search
- A Connecticut registered agent who meets the address rules described in Step 1
- A federal Employer Identification Number (EIN) from the IRS for the business bank account and tax filings
- DEEP exam study materials and a calendar of the published exam dates
- A business checking account and a payment method for state fees
- Insurance quotes for general liability, commercial auto and, if you will have employees, workers' compensation
- Your equipment list (saws, rigging gear, chipper, trailer, truck) so you can price insurance and budget accurately
- Draft client contract and estimate templates, reviewed by an attorney
Fee worksheet
Use this table to budget. The amounts below were checked in October 2026. Where a fee is not listed here, confirm it on the agency page.
| Item | Amount | Agency or source | Notes |
|---|---|---|---|
| LLC Certificate of Organization | $120 | Secretary of the State | Online filings are usually accepted automatically |
| Expedited review | $50 per transaction | Secretary of the State | 24 hours, online filings only, not by mail |
| Name reservation | $60 | Secretary of the State | Holds the name for 120 days |
| LLC Annual Report | $80 each year | Secretary of the State | Required every year |
| Trade name certificate | $20 | Town clerk | Only if you operate under a name other than your legal name |
| DEEP exam fee | $200 | DEEP | A failed written exam needs a $200 retest |
| Arborist application | $200 | DEEP | Confirm with DEEP whether this is paid with the exam fee or separately |
| Arborist license fee | $285 per license or renewal | DEEP | Licenses run up to 5 years |
| DEEP certificate of registration for an arborist business | $240 | DEEP | Expires August 31; confirm the renewal process |
| Sales and use tax permit | $100 registration fee | DRS | Needed only if you make taxable sales; confirm with DRS |
Step 1: Form your business entity
Most small tree services organize as a limited liability company (LLC). The LLC formation document is a Certificate of Organization, filed with the Secretary of the State for $120. File online at Business.CT.gov, where most filings are accepted automatically, so the state says expedited service is usually unnecessary. If you need speed, expedited review is $50 per transaction, completed within 24 hours, and only available for online filings.
Your name must contain Limited Liability Company or an abbreviation such as LLC or L.L.C. It also has to be distinguishable on the record from names already registered or reserved. Words that suggest a regulated activity, such as bank or insurance, require authorization, so avoid them. Reserve the name for $60 if you need time, which holds it for 120 days.
A corporation is possible, but it costs more to form and maintain. A Certificate of Incorporation for a domestic stock corporation is $250, followed by an Organization and First Report at $150. Annual Reports for corporations are $150 each year. Ask your CPA whether the corporate tax treatment makes sense for a small crew before you choose.
Registered agent. Every LLC and corporation formed in Connecticut must keep a registered agent who receives legal papers for the business. 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 business address must be a usual place of business in Connecticut, customarily open during normal business hours with an authorized person present. A post office box or commercial mailbox does not qualify. Many home-based owners assume their home address works. It may not, so confirm the requirement before you file, and update the agent information when you file your Annual Report.
Step 2: Get a trade name certificate if you need one
If your tree service will operate under a name such as Ridgeline Tree Care when your legal name is Ridgeline Tree Care LLC, you still need the name registered at the local level. Trade name certificates are filed with the town clerk of the Connecticut town where the business is primarily transacted, not with the Secretary of the State. The fee is $20. The state's trade name guidance is at https://business.ct.gov/knowledge-base/articles/trade-names.
Step 3: Pass the DEEP arborist exams
This is the license that makes your business legal to operate. Under Connecticut law, you must hold a DEEP arborist license to advertise, solicit or contract for tree care for hire. In pesticide terms, the arborist license is category 3D under the pesticide supervisor certification.
The exam has three parts, taken in this sequence:
- Written exam. A failed written exam requires a $200 retest fee.
- Tree identification test. You must score 80% or higher to pass.
- Practical oral exam. Confirm the format and what to bring with DEEP.
DEEP offers the exams quarterly in 2026 and 2027. The June 10 and September 9, 2026 oral dates have passed. As of October 22, 2026, the next listed oral dates are December 9, 2026 and March 10, 2027. Schedules shift, so confirm current dates with DEEP before you book travel or time off.
Plan your study around the dates, not the other way around. Pick the oral date first, then work backward. If you fail a part, you still have to repeat it on a later schedule, so the $200 retest fee and the lost quarter can add up.
What the license covers
The arborist license covers pesticides only on fruit, shade and ornamental trees. It does not authorize general lawn treatment, structural pest work or other pesticide applications. If your business plan includes those services, ask DEEP which additional certifications you need before you offer them. Do not assume the arborist license extends to them.
Once issued, the license covers the holder for up to 5 years, and each license or renewal carries the $285 license fee set by CGS 23-61b, along with the application fee listed in the table above.
Step 4: Register the business with DEEP
An individual arborist license is not enough by itself. Arborist businesses must also hold a DEEP certificate of registration under CGS 23-61h. The fee is $240, and the registration expires each August 31. Put that date on your calendar the day you receive it. Ask DEEP how the certificate is issued in your business name and how renewal works, so a missed renewal does not stop a job you have already booked.
Step 5: Set up insurance before the first job
Insurance is where small tree services get hurt. A fallen limb can damage a house, a car or a utility line, and the client may not care whose fault it was. This guide does not set minimum coverage amounts, so get quotes from a commercial insurance agent and review the limits against your client contracts.
- General liability covers property damage and injury claims from your work.
- Commercial auto covers your trucks and trailers, which are part of the job, not just transportation.
- Workers' compensation is required in Connecticut once you have employees. Confirm your obligations with the Workers' Compensation Commission and your insurer.
Tell your agent about the arborist and pesticide work. Some policies exclude certain operations unless you disclose them.
Step 6: Register with DRS and handle your taxes
The Connecticut Department of Revenue Services (portal.ct.gov/drs) handles state tax registration. Whether your tree service needs a sales and use tax permit depends on what you sell. A business selling taxable goods or services must hold a permit, which carries a $100 registration fee, and display it at each location. Tree removal and pruning billing may or may not be taxable in your situation, so confirm the treatment of each service you plan to sell with DRS, or ask a CPA. If you sell mulch, firewood or other goods, plan for the permit. The DRS sales tax information page is at https://portal.ct.gov/drs/sales-tax/tax-information.
Your entity type drives the tax picture:
- LLC taxed as a partnership or S corporation: Connecticut has no franchise tax or annual privilege tax on LLCs. You may elect the optional Pass-Through Entity Tax with DRS each year. The election is annual and irrevocable for that year.
- LLC treated as a corporation or a corporation: the Corporation Business Tax is 7.5% of apportioned net income with a $250 minimum, plus a capital base tax being phased out (0.16% for 2026, 0.11% for 2027, none from 2028, CGS 12-219). A 10% surtax applies to companies with total income of $100 million or more or that file in a combined unitary group. A small tree service will not usually reach the surtax threshold, but confirm your numbers.
- Personal income tax: Connecticut's personal income tax is progressive, with seven brackets from 2% to 6.99%. Set aside money for it from every payment you receive.
If you hire employees, you will also need to set up withholding and employer accounts with DRS. Confirm those steps on the DRS site.
Step 7: Clear local approvals in your town
Local rules are where tree businesses most often run into trouble after they are licensed. There is no county layer in Connecticut, so your approvals come from your town or city. Check these before you park a chipper in your driveway:
- Zoning: Many towns regulate home occupations, including commercial vehicles, equipment storage and outdoor work in residential zones. Ask the planning and zoning office what applies to your address.
- Public trees and rights of way: Many towns have a tree warden with authority over trees on town property and in the public right of way. Ask whether you need a permit before cutting or pruning trees along a town road.
- Utility lines: Work near power lines has its own rules and safety obligations. Confirm the utility's requirements before you start that work.
Rules differ from town to town, so do not assume that a neighboring town's answer applies to yours.
Step 8: Keep your advertising and contracts in line with your license
Since the DEEP license is required before you advertise or solicit, hold off on the truck lettering, website, flyers, online directory listings and door hangers until your license is issued. Mentioning tree work in a bid before you hold the license can put you on the wrong side of the statute, even if you have not yet done a job.
Tree and shrub cutting is exempt from Connecticut home improvement contractor registration. That exemption is specific to tree and shrub cutting. If you also plan fencing, decking, grading or other home improvement work, check with the Department of Consumer Protection before you offer it.
Step 9: Build a renewal calendar
Missed renewals are the most avoidable problem in this business. Set reminders for each of these:
| Obligation | Timing | Agency |
|---|---|---|
| LLC Annual Report ($80) | Every year; LLCs generally file between January 1 and March 31 under the state's common practice, but confirm your due date in your Business.CT.gov account | Secretary of the State |
| Corporation Annual Report ($150) | Every year; confirm your due date in your Business.CT.gov account | Secretary of the State |
| Registered agent information | Confirmed and updated each year with the Annual Report | Secretary of the State |
| Arborist license ($285 renewal fee) | Before the license expires; licenses run up to 5 years | DEEP |
| Business certificate of registration ($240) | Expires August 31 each year | DEEP |
| Trade name certificate ($20) | Filed with the town clerk when you adopt the name | Town clerk |
Common mistakes to avoid
- Advertising before the license. The license comes first. Calling yourself a tree service online or on a truck before you hold it creates a violation.
- Looking for a county license. Connecticut has no county government. Your local approvals come from your town or city.
- Treating the Secretary of the State filing as the whole process. An LLC registration does not give you the DEEP license, a DEEP business registration or tax permits.
- Filing a trade name with the state. Trade name certificates go to the town clerk, for $20.
- Assuming the arborist license covers all pesticide work. It covers pesticides only on fruit, shade and ornamental trees.
- Using a PO box as the registered agent address. A post office box or commercial mailbox does not qualify.
- Booking the wrong exam date. The published oral dates pass quickly, and a missed date can cost you a full quarter.
- Working without insurance you can prove. Clients and property managers often ask for certificates, and an uninsured job can wipe out a small business.
- Letting the DEEP registration lapse on August 31. Put it on your calendar the day you receive it.
What to expect when the steps are done
Once the entity, DEEP license, DEEP business registration, insurance, tax registrations and local approvals are in place, you may be able to bid and perform tree care for hire in Connecticut under the rules described here. Many owners find that the exam schedule, not the paperwork, sets their launch date, so the earlier you plan around the exam calendar, the sooner you can start. Outcomes depend on your town, your services and your market, and nothing in this guide promises a particular number of clients or revenue.
Next steps
- Check your business name in the Business.CT.gov records search and reserve it if you need time.
- File your Certificate of Organization and confirm your registered agent address.
- Choose your exam date from the published DEEP schedule and start studying.
- Get insurance quotes and set up a business bank account.
- Register with DRS, then confirm your local zoning and tree rules with your town.
The Connecticut Small Business Development Center (CTSBDC) at https://ctsbdc.uconn.edu/ offers free advising for new owners and can help you organize the order of these steps. For the legal structure, tax treatment and liability questions in your specific situation, consult a qualified attorney and a CPA before you sign contracts or make your first hire.