In their interpretation and application, the provisions of this chapter shall be held to be the minimum requirements adopted for the promotion of the public health, safety, comfort, convenience and general welfare. Except where specifically provided to the contrary, it is not intended by this chapter to repeal, abrogate, annul or in any way to impair or interfere with any rules, regulations or permits previously adopted or issued pursuant to law relating to the use or building structures, shelter or premises; nor is it intended by this chapter to interfere with or abrogate or annul any easements, covenants, or other agreements between parties; provided, however, that where this chapter imposes a greater restriction upon the use of a building or premises, or requires larger open spaces that are imposed or required by any other statue, ordinance, law, rule, regulation or permit, or by any easement or agreement, the provisions of this shall control.