1.   Except as provided in Section 165.20, no dwelling shall be located in a zoning district in which such a dwelling is not a permitted use.

2.   The conversion of any building into a dwelling, or the conversion of any dwelling so as to accommodate an increased number of dwelling units or families, shall be permitted only within a district in which a new building for similar occupancy would be permitted under the regulations, and only when the resulting occupancy will comply with the requirements governing new construction in such district with respect to minimum lot size, lot area per dwelling unit, dimensions of yards and other open spaces, and off-street parking.

3.   For the purpose of this chapter, modular homes or mobile homes shall be subject to the same minimum standards as residences of conventional structure.

4.   For the purposes of this chapter, one-family attached dwellings shall be considered the same as dwelling units which are part of two-family dwellings and multiple-family dwellings. One-family attached dwellings shall be permitted in any zone in which two-family dwellings or multiple-family dwellings are allowed, provided the total number of dwelling units per structure does not exceed the number per structure allowed.

5.   For one-family attached dwellings, minimum lot area, lot width, side yard width, front yard depth and rear yard depth requirements, shall not apply to individual attached dwelling units; provided, any structure containing two or more one-family attached dwellings shall comply with the minimum lot area, lot width, side yard width, front yard depth and rear yard depth requirements, as a whole, as if the structure and individual lots were a two-family or multiple-family dwelling on a single lot.

6.   All single-family dwelling units shall meet the following minimum standards:

   A.   The minimum width of a dwelling structure or principal building shall be twenty-two (22) feet at the exterior walls, exclusive of attached garages, porches or other accessory structures.

   B.   All dwelling units including attached garages shall be placed on a permanent frost-free foundation.

   C.   All dwelling units shall provide for a minimum of nine hundred (900) square feet of floor space.