# Business Occupations and Professions (GBO)

## Title 12. Plumbers

### Subtitle 4. Engaging in the Business of Providing Plumbing Services

#### Section 12-401

(a) A person may engage in the business of providing plumbing services if:

  (1) the person is a master plumber or holder of a limited master plumber license; or

  (2) the person:

    (i) designates a master plumber or holder of a limited master plumber license who actively directs, controls, and is responsible for all plumbing services; and

    (ii) otherwise provides the plumbing services in accordance with this title.

(b) A person may engage in the business of providing propane gas services if:

  (1) the person is the holder of a propane gas fitter certificate; or

  (2) the person:

    (i) designates a holder of a propane gas fitter certificate who actively directs, controls, and is responsible for all propane gas services; and

    (ii) otherwise provides the propane gas services in accordance with this title.

(c) A person may engage in the business of providing natural gas services if:

  (1) the person is the holder of a master natural gas fitters license; or

  (2) the person:

    (i) designates a holder of a master natural gas fitters license who actively directs, controls, and is responsible for all natural gas services; and

    (ii) otherwise provides natural gas services in accordance with this title.

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Md. Code Ann., Bus. Occ. & Prof. (as displayed at mgaleg.maryland.gov, October 16, 2026)