In interpreting and applying the provisions of this chapter, the provisions shall be held to be the minimum requirements for the promotion of the environmental quality, public health, safety and general welfare; therefore, when this chapter imposes a greater restriction upon the use of buildings or premises, or requires larger open spaces than are imposed or required by other laws, resolutions, rules or regulations, the provisions of this chapter shall control. This chapter shall supersede any conflicting section of any regulation adopted prior to April 14, 1975.