Md. Code, Public Safety § 12-504

(a) (1) A local jurisdiction may adopt local amendments to the Standards if the local amendments do not:

(i) prohibit the minimum implementation and enforcement activities set forth in § 12–505 of this subtitle;

(ii) weaken energy conservation and efficiency provisions contained in the Standards;

(iii) except as provided in paragraph (3) of this subsection, weaken the automatic fire sprinkler systems provisions for townhouses and one– and two–family dwellings contained in the Standards; or

(iv) weaken wind design and wind–borne debris provisions contained in the Standards.

(2) (i) Regardless of whether the International Green Construction Code is adopted by the Department under § 12–503(d) of this subtitle, a local jurisdiction may adopt the International Green Construction Code.

(ii) A local jurisdiction may make local amendments to the International Green Construction Code.

(3) Paragraph (1)(iii) of this subsection does not apply to:

(i) standards governing issuance of a building permit for a property not connected to an electrical utility; or

(ii) until January 1, 2016, standards governing issuance of a building permit for a new one– or two–family dwelling constructed on:

1. a lot subject to a valid unexpired public works utility agreement that was executed before March 1, 2011; or

2. a lot served by an existing water service line from a water main to the property line that:

A. is less than a nominal 1–inch size;

B. is approved and owned by the public or private water system that owns the mains;

C. was installed before March 1, 2011; and

D. is fully operational from the public or private main to a curb stop or meter pit located at the property line.

(b) If a local jurisdiction adopts a local amendment to the Standards, the Standards as amended by the local jurisdiction apply in the local jurisdiction.

(c) If a local amendment conflicts with the Standards, the local amendment prevails in the local jurisdiction.

(d) A local jurisdiction that adopts a local amendment to the Standards shall ensure that the local amendment is adopted in accordance with applicable local law.

(e) To keep the database established under this subtitle current, a local jurisdiction that adopts a local amendment to the Standards shall provide a copy of the local amendment to the Department:

(1) at least 15 days before the effective date of the amendment; or

(2) within 5 days after the adoption of an emergency local amendment.