The gross residential density shall not exceed 4.0 dwelling units per acre in residential cluster developments in accordance with the provisions set forth in Subsection 20-4.15 of this chapter.

The maximum dwelling net density for attached dwellings shall be six units per acre and the maximum dwelling net density for multifamily residential shall be ten units per acre. On those larger tracts where these housing types are permitted, there shall be no more units allowed than provided for under paragraph a above.

See the Schedule of District Regulations of this chapter.

Semi-detached dwellings shall not be permitted to increase improvement coverage by more than 15% over original construction subject to an overall site limitation of 40%, as set forth in the Schedule of District Regulations.

No building or deck expansion shall be permitted beyond the side yard established for each semi-detached dwelling at original construction.

Decks shall be permitted to extend into the required rear yard of semi-detached dwellings by up to 12 feet. Decks which extend into the required rear yard shall not be permitted to have a roof, and no impervious materials shall be permitted under a deck which extends into the required rear yard. A roofed deck shall be considered to be a part of the principal building and it shall be subject to all the building coverage, improvement coverage, floor area ratio and yard controls as set forth in the Schedule of District Regulations.

Additions to semi-detached dwellings shall be permitted only if the addition occurs in such a way that no front, side or rear yard setback is diminished, such as in an alcove. If an alcove is proposed for an addition, permission of the adjoining semi-detached dwelling is required.