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(A) Generally. No two single-family dwellings of similar front elevation or facade shall be constructed or located on adjacent lots; nor shall there be constructed or located single-family dwellings of similar front elevation or facade constituting more than 20% of the single-family dwellings in any streetscape. Front elevations or facades shall be deemed to be similar when there is no substantial difference in roof lines; and no substantial change in windows of either size, location or type; and either no change in the color of materials used (rather than a change in shade), or no substantial change in the kind of materials.
(B) Roof lines.
(1) For the purpose of this section, the following differences in the roof lines of single-family dwellings as seen from the front of the dwelling shall be deemed sufficient to render buildings containing such changes and built on adjacent lots to be dissimilar:
(a) Changing gable roofs to hip roofs;
(b) Changing hip roofs to gable roofs;
(c) Providing an intersecting gable roof on the main gable roof, provided that the height of the intersection roof is at least 50% of the height of the main roof;
(d) Providing an intersecting hip roof on the main hip roof; provided that, the height of the intersecting hip roof is at least 50% of the height of the main roof;
(e) Subject to review by the Building Official, a shed roof, when used as a front porch roof for a minimum of 50% of the entire width of the house, excluding area of garage;
(f) Subject to review by the Building Official, a substantial difference in roof line shall be deemed to exist if the front soffit is increased significantly and is combined with columns at least six inches in width or other architectural features of a similar magnitude which reach the roof line of the highest story;
(g) Rotating gable roofs 90 degrees on the building; and
(h) On a tri-level residence or other building type which has three independent major roof areas, the changing of two out of three roof lines shall be acceptable as a substantial change. Acknowledging certain design elements may prevent the changing of all three roof lines, it is desired that the roofs with the greatest impact on the streetscape be changed.
(2) The following changes shall not be deemed sufficient to make adjacent structures dissimilar:
(a) Gable roof atop hip roof;
(b) Hip roof atop gable roof;
(c) Small gable or hip projections above windows;
(d) Window dormers;
(e) Change in soffit overhang or minor variation in eave height; and
(f) Skylight and cupola.
(1) For the purpose of this section, the following differences in the size, location or type of windows shall be deemed sufficient to render buildings containing such changes and built on adjacent lots to be dissimilar:
(a) Changing from single windows to a multiple window arrangement (ganged units);
(b) Changing from multiple window arrangement to single window;
(c) Changing the type of windows (e.g., casement to double hung); and
(d) Providing a bay or bow window in the area of the predominant window.
(2) The following change shall not be deemed sufficient to constitute a substantial change in windows: the addition or subtraction of muntin bars (dividing lights).
(3) Where, because of its size, location or design, one window is the predominant window on the front elevation or facade, if the size, location or type of that window is changed to render the dwelling dissimilar, then no other window need be changed.
(D) Construction material or color.
(1) For the purpose of this section, the following differences in construction material between adjacent single-family dwellings as seen from the front of the dwellings shall be deemed sufficient to render buildings containing such changes and built on adjacent lots to be dissimilar.
(a) Four-inch exposure horizontal siding;
(b) Eight-inch exposure horizontal siding;
(c) Brick facing;
(d) Vertical siding;
(e) Stone facing; and
(f) Stucco/staccato board and trim.
(2) When materials are changed, the change must occur throughout the front facade or elevation for a minimum of one story in height.
(3) Color change shall be made by significant changes in adjacent colors. The change must be one of color rather than merely of the shade.