A. Purpose and definition.
(1) Purpose: The overall size of a Principal Building in relation to lot size affects the impact of the Principal Building's scale and mass on adjacent buildings and the Island as a whole. Improving the relationship between lot size and the Principal Building by limiting the Principal Building's maximum size promotes greater compatibility of new construction with existing development and contributes to overall neighborhood compatibility.
(2) Principal Building Square Footage: The entire square footage of the Principal Building or Buildings measured from the outside of the exterior walls, specifically including more than one dwelling on the same lot and historic structures used as accessory dwelling units, but not including (5-15-07) (12-17-13)
(a) interior space not readily useable as living space (attic used only for storage or parking area beneath dwelling);
(b) structures that are not used as living space;
(c) exterior porches and decks; and,
(d) exterior stairs.
B. Permitted principal building square footage.
(1) Lot Area of five thousand (5,000) square feet or less: Principal Building Square Footage limited to twenty four hundred (2400) square feet.
(2) Lot Area exceeding five thousand (5,000) square feet: maximum Principal Building Square Footage of twenty four hundred (2400) square feet may be increased 10 sf for every additional 100 square feet of Lot Area.
(3) Equation: [(Lot Area - 5000 sf) / 100 sf] x (10) + 2400 = Principal Building Square Footage.
Examples:
(a) 1/2 acre Lot 21,780 sf= 4078 Principal Building Square Footage.
(b) 1/3 acre Lot 14,505 sf= 3351 Principal Building Square Footage.
(c) 1/4 acre Lot 10890 sf= 2989 Principal Building Square Footage.
(d) Lot 5,000 sf= 2400 Principal Building Square Footage.
(4) The maximum permitted Principal Building Square Footage is fifty six hundred (5600) square feet for any newly constructed single-family home. Existing buildings shall be exempt from the 5600 square foot requirement and able to utilize their total principal building square footage for single-family use. (12-17-13)
C. Design Review Board.
(1) The Design Review Board may increase by no more than fifteen percent (15%) and not to exceed five hundred (500) square feet added to the maximum permitted Principal Building Square Footage if this or other modifications achieve greater Neighborhood Compatibility as described in ARTICLE XII except:
(i) In cases of the special exception, Section 21-20C.(2), allowing a second residential structure on a lot with the historic structure used as an accessory dwelling unit, wherein the Design Review Board may permit increases in the Principal Building Square Footage by no more than twenty-five percent (25%), or
(ii) In cases where the subject property has been designated historic, per Section 21-94, wherein the Design Review Board may permit increases in the Principal Building Square Footage by no more than twenty percent (20%). (5-15-07) (2-20-24)
(2) However, in no case shall any Principal Building Square Footage exceed 5,600 square feet or, when applicable, the principal square footage permitted in Sec. 21-27B.(4). (5-15-07) (12-17-13)
D. Notwithstanding any of the requirements in Sec. Sec. 21-27A.-C. above, single family residential structures in the CCOD 1 District may be permitted only if the principal building coverage area shall not exceed 80% of the maximum principal building square footage otherwise permitted in Sec. Sec. 21-27A.-C. The Design Review Board shall not have the authority to increase the principal building square footage as set forth in Sec. 21-27C. for single family residential structures on CCOD 1 or 2 Overlay District lots; provided, however, the Design Review Board may exercise the discretion described in Sec. 21-49. (6/19/07) (3/20/12)
(Ord. 2023-07, passed 2-20-2024)