Del. Code tit. 9, § 2505

The County Council shall adopt rules and regulations providing for the charge of reasonable fees for the administration and enforcement of the New Castle County Building Code including fees for the issuance of permits, inspections and registration. The basis for establishing building permit costs shall be limited to the building or structure and its functional parts including its mechanical system, fuel gas system, plumbing system, building sewer system or any other similar system within or about such building or structure.