Del. Code tit. 9 § 2611
Whenever any regulation made under authority of this subchapter requires a greater width or size of yards, courts or other open spaces, or requires a lower height of buildings or smaller number of stories, or requires a greater percentage of lot to be left unoccupied, or imposes other higher standards than are required in or under any other statute or local regulation, the regulations made under authority of this subchapter shall govern. Whenever any other statute or local regulation requires a greater width or size of yards, courts or other open spaces, or requires a lower height of buildings or a lesser number of stories, or requires a greater percentage of lot to be left unoccupied, or imposes other higher standards than are required by any regulations made under authority of this subchapter, such statute shall govern.
9 Del. C. § 2611