It is not intended by this chapter to repeal, abrogate, annul or interfere with any existing ordinances or enactment, or with any rule, regulation or permit adopted or issued thereunder, except insofar as the same may be inconsistent or in conflict with any of the provisions of this chapter, provided that, where this chapter imposes greater restrictions upon the use of buildings of land or upon the height and bulk of buildings or prescribes larger open spaces than are required by the provisions of such ordinance, enactment, rule, regulation or permit, then the provisions of the chapter shall control.