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How do you check a plumber’s license for plumbing work in Maryland?

Use the Maryland board’s public query to choose a name, location or registration-number search. Start with the plumber’s last name and add a city to narrow the search. Treat complaint history and the work location as separate questions when deciding which agency to consult.

Source: Maryland board licensing FAQ, read 1 November 2026.
Source: Maryland Department of Labor public query, read 1 November 2026.
Source: Maryland board complaint FAQ, read 1 November 2026.

The license lookup is yours to run on the state's site.

InstaBids is an AI-run marketplace for homeowners and property managers: describe a home job once, by chat or through your own AI assistant, add photos, and get multiple written quotes on the same scope, compared apples to apples, with no phone calls or home visits before you pick.

By InstaBids editorial team with AI research agents. Sources last read: 1 November 2026

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Key facts

How do I check a plumbers license?

Open Maryland’s official plumber lookup. The public-query page labels its name route "By Name (Last Name, and optionally, City Name)".

Source: Maryland Department of Labor public query, read 1 November 2026.

For that route, the Maryland form instructs: "Enter a whole or partial name. Optionally, add a city name to refine your search." The form labels the last name as required and the city as optional.

Source: Maryland Department of Labor public query, read 1 November 2026.

The other geographic route is labelled "By Location (City Name or Zip Code)".

Source: Maryland Department of Labor public query, read 1 November 2026.

The agency describes the query with this sentence: "You may search for active licensees practicing in the State of Maryland as follows:". Read any status wording exactly as the record presents it.

Source: Maryland Department of Labor public query, read 1 November 2026.

Source: Maryland public query and search choices, read 1 November 2026; name-search instructions, read 1 November 2026.

Source: Maryland Department of Labor public query, read 1 November 2026.
Source: Maryland Department of Labor public query, read 1 November 2026.

For the legal starting point, the Maryland General Assembly publishes Business Occupations and Professions §12–301(a)(1): "(a) (1) Except as otherwise provided in this title, an individual shall be licensed by the Board to provide plumbing services before the individual may provide plumbing services in the State."

Source: Maryland General Assembly, section 12–301, read 1 November 2026.

For the separate question of assisting with the work, the same official text, §12–301(a)(2), reads: "(2) Except as otherwise provided in this title, an individual shall be licensed by the Board to provide or to assist in providing plumbing services before the individual may assist in providing plumbing services in the State."

Source: Maryland General Assembly, section 12–301, read 1 November 2026.

Source: Maryland §12–301, read 1 November 2026.

Source: Maryland General Assembly, section 12–301, read 1 November 2026.

Who can file a complaint?

The Maryland board’s complaint FAQ states: "Any person can file a complaint against an unlicensed or licensed individual offering, providing, or assisting in providing plumbing and gas services in Maryland."

Source: Maryland board complaint FAQ, read 1 November 2026.

Source: Maryland board complaint FAQ, question 3, read 1 November 2026.

Source: Maryland board complaint FAQ, read 1 November 2026.

What is the certificate of insurance requirements?

The Maryland General Assembly’s text supplies the precise contracting context in Business Occupations and Professions §12–501(a):

Source: Maryland General Assembly, section 12–501, read 1 November 2026.

"(a) A master plumber or holder of a limited master plumber license may not contract to provide plumbing services on behalf of the master plumber, holder of a limited master plumber license, or another person who engages in the business of providing plumbing services unless the plumbing work of the master plumber or holder of a limited master plumber license is covered by liability insurance, including completed operations:"

Source: Maryland General Assembly, section 12–501, read 1 November 2026.

Bodily-injury amount, §12–501(a)(1): "(1) for bodily injury in the amount of at least $300,000; and"

Source: Maryland General Assembly, section 12–501, read 1 November 2026.

Property-damage amount, §12–501(a)(2): "(2) for property damage in the amount of at least $100,000."

Source: Maryland General Assembly, section 12–501, read 1 November 2026.

Source: Maryland §12–501(a), insurance for contracting, read 1 November 2026.

Source: Maryland General Assembly, section 12–501, read 1 November 2026.

How do I check a plumber’s complaint history?

The Maryland public query gives a separate direction for discipline: "Note: Please contact us if you need information regarding disciplinary actions against a licensee."

Source: Maryland Department of Labor public query, read 1 November 2026.

On public complaint records, the board’s complaint FAQ, question 12, answers: "Yes, the existence of a complaint may be disclosed to a member of the public. Complaints remain part of the plumber’s public record for three fiscal years."

Source: Maryland board complaint FAQ, read 1 November 2026.

The work location matters. The board’s complaint FAQ states: "For complaints involving plumbing work done in either Baltimore County or the area served by the Washington Suburban Sanitary Commission (WSSC), including Prince George’s and portions of Montgomery Counties, the complaint should be directed to one of those agencies."

Source: Maryland board complaint FAQ, read 1 November 2026.

Source: Maryland query’s discipline direction, read 1 November 2026; board complaint FAQ, questions 2, 3 and 12, read 1 November 2026.

Source: Maryland Department of Labor public query, read 1 November 2026.
Source: Maryland board complaint FAQ, read 1 November 2026.

How do I file a complaint?

For a new complaint, the board’s FAQ begins: "Please complete and sign a written complaint form."

Source: Maryland board complaint FAQ, read 1 November 2026.

The Maryland board’s complaint FAQ, question 8, answers: "No. The Board has no authority to order a plumber to reimburse or return funds to an individual. However, an individual may file a private civil case with the appropriate court for relief."

Source: Maryland board complaint FAQ, read 1 November 2026.

Its answer to the separate question about ordering repairs is also limited: "No, the Board does not have the authority to order a plumber to return to a particular property or to otherwise provide services to an individual to correct, repair, or provide specific services."

Source: Maryland board complaint FAQ, read 1 November 2026.

Source: Maryland complaint FAQ, questions 2, 8 and 13, read 1 November 2026.

Source: Maryland board complaint FAQ, read 1 November 2026.

Related pages: All states · Maryland contractor lookup · Home inspector lookup in Maryland · Virginia contractor license check · Pennsylvania contractor registration check · Delaware contractor license check.

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