It is not intended by this chapter to repeal, or change the existing provisions of other laws or ordinances, except those specifically repealed by this chapter.

Where this chapter imposes a greater restriction upon the use of buildings or premises or upon the height of buildings or lot coverage, or requires greater lot area, or larger yards, or other open spaces than are imposed or required by such rules, regulations or permits or by such private restrictions, the provisions of this chapter shall prevail.