It is not intended by this chapter to repeal, abrogate, annul or interfere with any existing ordinance 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 restriction upon the use of buildings or land, or upon the height and bulk of buildings, or prescribes larger open spaces than one required by the provisions of such ordinance enactment, rule, regulation or permit, then the provisions of this chapter shall control.