Maryland Code, Insurance § 19-213

(a) Each policy of homeowner's, farmowner's, or dwelling insurance issued, sold, or delivered in the State that provides property coverage for a dwelling or personal property on a replacement cost basis shall contain a provision that allows an insured to file a claim for the difference between the actual cash value and the replacement cost for the completed repairs or replacement for not less than 2 years after the date of loss.

(b) An insurer may require an insured seeking additional payments on a replacement cost basis to notify the insurer, within 180 days after the date of loss, of the insured's intent to repair or replace the dwelling or personal property.