In interpreting and applying the provisions of this chapter, they shall be held to be the minimum requirements for necessary promotion of the public health, safety, convenience, comfort, prosperity or general welfare. It is not the intent of 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 and dimensions of buildings or premises or requires larger open spaces than are imposed or required by other ordinances, rules, regulations, or by easements, covenants, or agreements, the provisions of this chapter shall govern, except where expressly qualified by this chapter.