The interpretation and the application of the provisions of this chapter shall be held to be the minimum requirements for the promotion of the health, safety, morals, and general welfare and shall be considered liberally to affect the purposes thereof. This chapter is not intended to interfere with, 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.