Plumbing Contractor Permit Requirements in Portland, ME

Complete permit and license guide for starting a plumbing contractor in Portland, Cumberland County, Maine.

Updated 2026-03-15 5 stops $400–$1,200 est. 4–10 weeks to obtain all licenses
Get my personalized route — $14.99

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 Maine

1 stop

  1. Maine Revenue Services — Sales Tax Registration

    Required for all businesses selling tangible personal property or taxable services in Maine. Maine charges a 5.5% state sales tax (food and lodging have different rates). Register with Maine Revenue Services online.

    Official government source

    FreeImmediate (online)

City of Portland / Cumberland County

3 stops

  1. Maine Plumbers Examining Board — Master Plumber License

    Plumbing contractors in Maine must hold a Master Plumber License from the Maine Plumbers Examining Board. Requires apprenticeship experience and passing a state exam.

    Official government source

    $100–$200 (initial)4–8 weeks

  2. City of Portland City Clerk / Licensing Division — Business License

    Portland requires a Business License for most businesses operating within city limits. The City Clerk's office issues licenses for regulated business types including food service and personal care. 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. Cumberland County / Portland 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

Want this mapped to your exact business and structure, in filing order?

Get my personalized route — $14.99

Official Sources

Related Guides