In interpreting and applying the provisions of this chapter, they shall be held to be the minimum requirements for the promotion of the public safety, health, convenience, comfort, morals, prosperity, and general welfare. It is not intended by this chapter to interfere with or abrogate or annul any ordinance, rules, regulations, or permits previously adopted or issued, and not in conflict with any of the provisions of this chapter or which shall be adopted or issued pursuant to law relating to the use of buildings or premises, and, likewise, not in conflict with this chapter; nor is it intended by this chapter to interfere with or abrogate or annul any easements, covenants, or other agreements between parties, except that if this chapter imposes a greater restriction, this chapter shall control.