In the interpretation and the application of the provisions of this chapter, they shall be held to be the minimum requirements for the promotion of the health, safety, morals and general welfare. It is not intended to interfere with or abrogate or annul other rules, regulations or ordinances, provided that where this chapter imposes greater restrictions upon the use of buildings or premises or upon the height or bulk of a building, or requires larger open spaces, the provisions of this chapter shall apply.