Statement of purpose. The requirements contained in this section are designed to promote and protect the public health, to prevent overcrowded living conditions, to guard against the development of substandard neighborhoods, to conserve established property values, and to contribute to the general welfare.

Minimum schedule for floor area. Every dwelling or other building devoted in whole or in part to a residential use which is hereafter erected or converted to accommodate additional families shall provide a minimum floor area per family on finished floors with clear ceiling height of not less than seven feet and six inches in conformity with the following schedule and with other provisions of this section. The minimum stipulated herein shall be deemed to be exclusive of unenclosed porches, breezeways, garage areas and basement and cellar rooms or areas.

First floor area of a dwelling. The minimum first floor enclosed area of a dwelling, exclusive of garage or other accessory building, shall be 750 square feet and its least overall dimension shall be 20 feet.