How to Start a General Contracting Business in Connecticut: Major Contractor and Trade Requirements

If you want to start a general contracting business in Connecticut, the first thing to know is that the state does not issue a general contractor license. There is no statewide GC license to apply for. Connecticut regulates contracting by the type of work and the trade involved. Most general contractors put together three pieces: an entity registered with the Connecticut Secretary of the State, a home improvement or new home construction registration where that applies, and trade licenses for the electrical, plumbing, HVAC and similar work their crews perform. A narrow category of large commercial work falls under a separate Department of Consumer Protection (DCP) major contractor registration.

This guide walks through the order we recommend. It covers what to have ready, the filings in sequence, the fees confirmed from official sources, and the points you need to verify directly with the agency. Fees and rules change, so treat this as a roadmap and check each step before you file or pay.

How Connecticut Regulates General Contractors

Before you file anything, sort your planned work into one of three categories, because each one has different requirements.

• Major contracting. A DCP major contractor registration under CGS 20-341gg applies only to work affecting the structural integrity of threshold buildings. A building meets that threshold if it has 4 stories, is 60 feet in height, has a 150 foot clear span, has 150,000 square feet of gross floor area, or is designed for occupancy of 1,000 people. Some use groups carry extra limits. Major contracting excludes small commercial buildings, new homes, residential work, and work performed under a trade license.
• Home improvement or new home construction. Residential remodeling, additions, and new houses are covered by a DCP home improvement or new home construction registration rather than the major contractor rules.
• Trade work. Electrical, plumbing, HVAC and similar work is licensed by trade. The people doing that work must hold the right license. Check with DCP whether your business needs its own registration as well. Confirm which trade licenses apply to your crews with DCP.

Most small contractors in Connecticut never need the major contractor registration. A kitchen remodel, a deck, or a single-family addition falls under home improvement and trade licensing. Make sure the threshold question is settled before you pay for a major contractor application you do not need.

What You Need Before You Start

• A business name that includes "Limited Liability Company" or an abbreviation such as "LLC" (or the corporate equivalent), and that is distinguishable on the state record. Check availability free in the Business.CT.gov business records search.
• A Connecticut registered agent. This must be a Connecticut resident age 18 or older, 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 that is open during normal business hours with an authorized person present. A post office box or commercial mailbox does not qualify.
• A federal employer identification number (EIN) from the IRS for your entity, bank account, and payroll.
• Two credit references if you will apply for major contractor registration: one from a supplier or subcontractor, and one from a financial institution.
• Licensed personnel for each trade you will perform, or a plan to subcontract that work to properly licensed firms.
• Insurance quotes for general liability and workers' compensation. Your insurer can tell you what your projects and your local customers will require.
• A Business.CT.gov account for online filings.

Connecticut Filing Fees at a Glance

The table below lists the state fees confirmed from official sources. Items marked "confirm with DCP" are not settled figures in this guide.

Item	Agency	Fee
Certificate of Organization (LLC)	Secretary of the State	$120
Certificate of Incorporation (stock corporation)	Secretary of the State	$250
Organization and First Report (corporation)	Secretary of the State	$150
Annual Report (LLC)	Secretary of the State	$80 per year
Annual Report (corporation)	Secretary of the State	$150 per year
Name reservation (valid 120 days)	Secretary of the State	$60
Expedited online processing	Secretary of the State	$50 per transaction, 24 hours, online only
Trade name certificate (DBA)	Town clerk	$20
Sales and Use Tax Permit (if required)	Department of Revenue Services	$100 registration fee
Home improvement registration	DCP	$120 application plus $100 Home Improvement Guaranty Fund per CGS 20-421 and 20-432; confirm with DCP
New home construction registration	DCP	$120 application plus $240 New Home Construction Guaranty Fund per CGS 20-417b and 20-417i; confirm with DCP
Major contractor registration (initial)	DCP	Confirm with DCP; no fee while the contractor is state prequalified (CGS 20-341gg)
Major contractor renewal	DCP	$500 per year
Trade licenses	DCP	Confirm with DCP

Step 1: Choose Your Scope of Work

Write down the project types you expect to bid in the first two years: residential remodels, new home builds, small commercial tenant fit-outs, or large commercial structures. Your answers decide which DCP registrations you need. If you plan to take on threshold buildings, the major contractor path is required for that work, so you need the credit references and the annual renewal in your budget. If you plan only residential and small commercial work, start with home improvement or new home construction registration and trade licensing. You can add the major contractor registration later if your work changes.

Step 2: Form Your Entity With the Secretary of the State

Most contractors form an LLC because it separates personal assets from business liabilities and has simpler governance than a corporation. File the Certificate of Organization (Domestic Limited Liability Company) through Business.CT.gov at business.ct.gov. The LLC filing fee is $120. Expect the Secretary of the State to accept most online filings automatically. The state says expedited service is usually unnecessary, though it is available for $50 per transaction with a 24 hour review for online filings only.

Major contractor applicants must register the entity with the Secretary of the State before applying to DCP. Do this first, because DCP requires legal entities to register with the Secretary of the State before applying. Corporations file a Certificate of Incorporation for $250 and then an Organization and First Report for $150. The Secretary of the State office is at portal.ct.gov/sots/business-services/bsd.

Use the business records search at service.ct.gov to confirm your name is available. If you need time to file, a name reservation costs $60 and lasts 120 days.

Step 3: Appoint a Compliant Registered Agent

Every LLC and corporation formed in Connecticut must maintain a registered agent who receives legal and official correspondence. Many new contractors make the mistake of listing a home mailbox or a post office box. Connecticut does not accept a PO box or commercial mailbox for this purpose. The agent's address must be a usual place of business in Connecticut. Agent information is confirmed each year with your Annual Report, so update it immediately if you change agents or move your office.

Step 4: Register a Trade Name if You Will Operate Under It

If you will do business under a name different from your registered entity name, such as a shorter brand name, file a trade name certificate with the town clerk. The trade name certificate is not filed with the state. It costs $20 and goes to the town where the business is primarily transacted. Check the state guidance at business.ct.gov for details.

Step 5: Register for Home Improvement or New Home Construction Work

If your projects involve residential remodeling, additions, or new homes, you need the DCP home improvement or new home construction registration. This is the core registration for most general contractors in Connecticut. By statute the application fee is $120 plus a $100 payment to the Home Improvement Guaranty Fund (CGS 20-421 and 20-432), the registration expires every March 31 and renews at the same fee, and the applicant must show general liability insurance of at least $20,000. A new home construction registration is separate: $120 plus $240 for the New Home Construction Guaranty Fund (CGS 20-417b and 20-417i), also expiring March 31. Confirm the current amounts, forms and documentation with DCP before you bid work. Keep in mind that the registration covers the business. It does not replace the trade licenses your technicians need.

Step 6: Secure Trade Licenses for Your Crews

Electrical, plumbing, HVAC and similar work is licensed by trade through DCP. Each person performing that work must hold the license that matches the job, and the license categories and requirements differ by trade. Build a staffing plan that shows which licensed person will supervise each trade on each job. If you do not employ licensed tradespeople, subcontract that work to licensed firms and check their licenses before you sign. Confirm the license types and experience requirements directly with DCP, since rules and fees can change.

Step 7: Apply for Major Contractor Registration if Your Work Requires It

Apply for the major contractor registration only if you will perform structural work on threshold buildings. Your application will require:

• A registered Connecticut entity on the Secretary of the State record (complete Step 2 first).
• Two credit references: one from a supplier or subcontractor, and one from a financial institution.
• Any other documents DCP lists on the application. Confirm the current list with DCP.

Major contractor registrations expire annually on June 30 and cost $500 to renew. If your registration lapses, you may reinstate it within three years. Do not assume a reinstatement is simple, though, and confirm the reinstatement process with DCP before you let a registration lapse. Ask DCP to confirm the initial application fee. By statute (CGS 20-341gg), a contractor prequalified with the state under CGS 4a-100 pays no registration fee while that prequalification stays valid.

Step 8: Handle Tax Registration With the Department of Revenue Services

Your tax status depends on how your entity is classified. An LLC taxed as a partnership or S corporation may elect the optional Pass-Through Entity Tax with the Department of Revenue Services (DRS) at portal.ct.gov/drs. The election is annual and irrevocable for that year. An LLC treated as a corporation pays the Corporation Business Tax of 7.5 percent of apportioned net income, with a $250 minimum, plus a capital base tax that is being phased out. Companies with total income of $100 million or more, or that file in a combined unitary group, also pay a 10 percent surtax. Connecticut has no franchise tax or annual privilege tax on LLCs as such.

Ask whether you need a Sales and Use Tax Permit. A business selling taxable goods or services must hold one, and the registration fee is $100. Whether your contracting work is taxable is a question for DRS, so confirm before you assume you are exempt. Read more at the DRS sales tax information page.

Step 9: Get Local Approvals for Each Job

Connecticut has no county government, so your local approvals come from the town or city where the work happens. Permits, zoning, and health approvals are issued by town and city offices and by local health departments or districts. Each town sets its own rules for building permits, contractor registration, and home occupations, so check the town building department before you start work in a new municipality. Connecticut's largest cities, including Hartford, Bridgeport, New Haven, Stamford, and Waterbury, each run their own permitting process.

Step 10: Insure the Business and Set Up Your Records

Before you bid your first job, get general liability and workers' compensation coverage in writing. Many property owners, general contractors, and public bodies ask for certificates of insurance before awarding work. Open a separate business bank account, set up accounting that tracks job costs, and keep signed contracts and change orders for every project. Your insurer and an accountant can help you set this up correctly.

Tips to Keep the Process Moving

• Check the entity record first. DCP requires a major contractor entity to be registered with the Secretary of the State before it applies, so keep that filing current.
• Calendar your deadlines. Business.CT.gov shows each entity its own next Annual Report due date. Major contractor registrations expire June 30.
• Verify subcontractor licenses. Check each subcontractor's license or registration with DCP before you sign.
• Use the free help. The Connecticut Small Business Development Center at ctsbdc.uconn.edu and the SBA's Connecticut district page at sba.gov offer guidance on planning and financing.

Common Mistakes to Avoid

• Looking for a general contractor license. Connecticut does not issue one. Searching for it wastes time. Focus on the registrations and trade licenses that apply to your work.
• Applying for major contractor registration for every job. It applies only to threshold buildings. Residential and small commercial work falls outside it.
• Using a PO box as the registered agent address. Connecticut requires a usual place of business in the state.
• Missing the Annual Report. The LLC Annual Report costs $80 and the corporate Annual Report costs $150. Missing it can put your good standing at risk.
• Letting a registration lapse. Major contractor registrations expire June 30, and the reinstatement window is three years. Waiting until a bid deadline is a costly approach.
• Assuming a trade license covers everyone. Each person doing licensed work needs the right license, and each trade is licensed separately.
• Skipping the town trade name filing. If you bill under a name other than your registered entity, file the $20 trade name certificate with the town clerk.

What Results to Expect

A well-prepared filing package can often move through the Secretary of the State's online system quickly, and most online filings are accepted automatically. Timing for DCP registrations and trade licenses varies, so plan for approval time before you bid work that depends on it. Many contractors find that the paperwork is the easy part and that insurance, staffing licensed trades, and getting local permits take the most planning. Results depend on your scope, your staff, and the towns you serve, so treat these timelines as estimates and confirm each one with the agency.

Next Steps

Start by deciding whether your work is residential, small commercial, or threshold major contracting. Form your entity and appoint a Connecticut registered agent. Then confirm the DCP registrations and trade licenses your crews need, and get your insurance quotes in hand before your first bid. Keep a calendar of renewal and Annual Report dates from day one.

Disclaimer: This article is informational content about forming a business in Connecticut. It is not legal or tax advice. Fees, thresholds, and rules can change, so confirm every figure with the Connecticut Secretary of the State, the Department of Consumer Protection, the Department of Revenue Services, and your local town office before you act. Because contracting involves licensing, liability, and tax questions, consult a qualified Connecticut attorney and a certified public accountant before you form your business or take on complex projects.