A. The area covered must be measured from the outside of external walls of enclosed spaces, from the outer edge of the floor of open decks and porches and from the supporting members of structures such as a carport which are not enclosed by walls.

B. The roof overhang must not be included in the lot coverage unless it exceeds three feet, in which case the portion of the roof overhang extending beyond three feet must count as part of the lot coverage.

C. Open beams and lattice work without a roof are not considered part of the lot coverage.

D. Minor appurtenances such as bay windows, chimneys and trim not extending more than two feet from the primary wall, and not extending the enclosed floor area, must not count in lot coverage.

E. Decks or patios on grade within an average height of 18 inches above grade must not count in lot coverage.

F. For unusual structures, for example, communication towers, the Director must determine the extent of lot coverage.

G. Modification for All Residential Zones, Except for R1. One detached accessory structure not exceeding 144 square feet is permitted without counting as part of the lot coverage. The lot coverage of any additional accessory structures or of any accessory structure exceeding 144 square feet shall count as part of the percentage of lot coverage permitted in these zones.

H. Modifications for Townhouse and Multifamily Development in the R4 Zone .