Md. Code, Business Regulation § 17–601

(a) In this subtitle the following words have the meanings indicated.

(b) “Construction license” means a license issued by the clerk to do construction business.

(c) (1) “Do construction business” means to agree to:

(i) pave or curb a sidewalk, street, or other public or private property;

(ii) excavate earth, rock, or other material for a foundation or other purpose; or

(iii) do work on or in a building or other structure that requires the use of a building material, including:

1. paint;

2. stone;

3. brick;

4. mortar;

5. wood;

6. cement;

7. structural iron;

8. structural steel;

9. sheet iron;

10. galvanized iron;

11. metallic piping;

12. tin;

13. lead;

14. electric wiring; or

15. any other metal.

(2) “Do construction business” does not include home improvement as defined in § 8–101 of this article.

(d) “Nonresident construction license” means a construction license issued by the clerk to a person who is incorporated or has its principal office in another state.