Whenever the requirements of this chapter conflict with the requirements of any other laws, rules, regulations, codes or ordinances, the most restrictive of such laws, rules, regulations, codes or ordinances or those imposing the higher standards shall govern. In their interpretation and application, the provisions of this chapter shall be held to be the minimum requirements adopted for the promotion of public health, safety, comfort, convenience, and general welfare. It is not intended by this chapter to repeal, abrogate, annul or in any way impair or interfere with the existing provisions of law or with any permits previously adopted or issued; nor is it intended by this chapter to interfere or abrogate or annul any easements, covenants or other agreements between the parties; provided, however, that where this chapter imposes a greater restriction upon the use of buildings or premises or upon the height of buildings or requires larger yards, courts or other open spaces than are imposed or required by such existing provisions of law or ordinance or by such rules, regulations or permits, or by such easement, covenant or agreement, the provisions of this chapter shall control.