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