Conflicting provisions. The provisions of this chapter shall be held to be the minimum requirements for the promotion of public health, safety and general welfare. When this chapter imposes a greater restriction on the use of buildings or land or the height of buildings or requires larger open spaces or makes any other greater requirement than is imposed or required by any other ordinance, rule or regulation or by easements, covenants or agreements, the provisions of this chapter shall govern. Should any section or provision of this chapter be declared null, void, voidable, or invalid, such finding of invalidity shall not affect the validity of the remaining portions of this chapter.