It is the policy of the State to promote and encourage the creation of accessory dwelling units on land with a single–family detached dwelling unit as the primary dwelling unit in order to meet the housing needs of the citizens of Maryland. Except as provided in this subtitle and subject to paragraph (2) of this subsection, this subtitle does not alter or abrogate any zoning power or related authority granted to a local jurisdiction under this title. Local jurisdictions shall establish policies that further the intent of this subtitle.