Md. Code, Pub. 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.