Maryland Code, BUSINESS OCCUPATIONS AND PROFESSIONS 12-303
(1) submit to the Board an application on the form that the Board provides; and
(2) except as otherwise provided in this subtitle, pay to the Board or the Board’s designee an examination fee set by the Board for:
(i) a master plumber license, a journey plumber license, or a master natural gas fitters license, in an amount not to exceed the cost of the required examination;
(ii) an apprentice plumber license or apprentice natural gas fitters license;
(iii) a propane gas fitter certificate;
(iv) a journeyman natural gas fitters license; or
(v) a master natural gas fitters license without examination.