It is not intended for this chapter to repeal, abrogate, annul, or interfere with any existing ordinance or enactment, or with any rule, regulation, or permit adoption 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, regulation, or permit, then the provisions of this chapter shall control.