In its 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. It is not intended by this chapter to repeal, abrogate, annul or in any way to impair or interfere with any existing provisions of laws or ordinances or any rules or regulations or permits previously adopted or issued or which shall be adopted or issued pursuant to law relating to the use of buildings 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 the requirements of this chapter with respect to the use of buildings or premises, the height of buildings, yards, courts, or other open spaces are at variance with those required by such existing provisions of law or ordinance, or by such rules, regulations or permits, or by such easements, covenants or agreements, the more restrictive shall control.

Wherever the requirements of this chapter are at variance with the requirements or any other lawfully adopted rules, regulations or ordinances, the most restrictive of those imposing the higher standards shall govern.