In their interpretation and application, the provisions of this chapter shall be deemed minimum requirements, adopted for the promotion of the public health, morals, safety, or the general welfare. Whenever the requirements of this chapter are at variance with the requirements of any other lawfully adopted rules, regulations, or ordinances, the most restrictive, or that imposing the higher standards, shall govern.

If any provision of this chapter or the application thereof to any person, property, or circumstances is held to be invalid, the remainder of this chapter and the application of each provision to other persons, property, or circumstances shall not be affected thereby.

This chapter shall not repeal, abrogate, annul, or in any way impair or interfere with any existing provisions of law or of any rules or regulations previously adopted or issued relating to the use of buildings or premises, provided that where this chapter imposes a greater restriction upon the use of buildings or premises or requires larger lots or yards than are imposed or required by such existing provisions or regulation, the provisions of this chapter shall control.

This chapter shall take effect on January 1, 1990.