In their interpretation and application, the provisions of this chapter shall be held to be minimum requirements, adopted for the promotion of the public health, morals, safety or the general welfare. It is not intended to interfere with, abrogate or annul other rules, regulations or ordinances, provided that, whenever the requirements of this chapter are at variance with the requirements of any other lawfully adopted regulations, rules or ordinances, the most restrictive or those which impose the highest standards, shall govern.