Plumbing Contractor Permit Requirements in New Haven, CT

Complete permit and license guide for starting a plumbing contractor in New Haven, New Haven County, Connecticut.

Updated 2026-03-15 5 stops $400–$1,200 est. 4–10 weeks to obtain all licenses
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Not legal advice. Requirements may change — always verify with your local government authority before applying. This guide was compiled from public and official sources (last updated ) and has not yet been independently source-verified — confirm each requirement before acting on it.

Federal — start here

1 stop

  1. EIN (Employer Identification Number)

    Required if you have employees or operate as an LLC or corporation. Free from the IRS.

    Official government source

    FreeImmediate (online application)

State of Connecticut

1 stop

  1. Connecticut Department of Revenue Services — Sales Tax Permit

    Required for all businesses selling tangible personal property or taxable services in Connecticut. Connecticut charges a 6.35% state sales tax. Certain services are also taxable in Connecticut, which has a broader sales tax base than many states. Register with the Connecticut Department of Revenue Services.

    Official government source

    FreeImmediate (online via myconneCT)

City of New Haven / New Haven County

3 stops

  1. Connecticut Department of Consumer Protection — Plumbing and Piping Work License

    Plumbing contractors in Connecticut must hold a P-1 (unlimited) or P-2 (limited) contractor license from CT DCP. A licensed journeyman plumber must be on staff. Requires passing a state licensing exam.

    Official government source

    $200 (initial)4–8 weeks

  2. City of New Haven Department of Licenses and Inspections — Business License

    New Haven requires a Certificate of Zoning Compliance and business-specific licenses for regulated industries. The Department of Licenses and Inspections issues permits for businesses operating within city limits. This license must be renewed annually and displayed at your place of business.

    Official government source

    $50–$500/year depending on business type and gross revenues1–3 weeks

  3. New Haven County / New Haven Plumbing Permit (per project)

    A separate permit must be pulled with the local building/plumbing department for each job. Inspections are required upon job completion.

    Official government source

    $50–$300 per project1–5 business days

Terminus

Open for business — est. $400–$1,200 · 4–10 weeks to obtain all licenses

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Official Sources

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