All districts
Detached garages, sheds, and other accessory buildings may not stand in any required front or exterior side yard (Section 4.19.1.B). A detached accessory building must sit at least 6 feet from any interior side or rear lot line and at least 10 feet from the main building (Section 4.19.1.G), and all accessory buildings together may cover at most 25 percent of the required rear yard (Section 4.19.1.C).
Aggregate floor area caps by district (Section 4.19.1.E): 850 square feet in R-3, R-4, and RT; 1,000 square feet in R-2; 1,500 square feet in RA and R-1, though an undersized R-1 lot is held to 1,000. In no instance may the aggregate of all accessory buildings exceed the ground floor area of the principal building on the lot; this cap applies in every residential district (Section 4.19.1.E.v). The sole exception: in RA and R-1 the total may exceed the house's footprint, up to 2,500 square feet, only on a deed-restricted lot of at least 1 acre (Section 4.19.1.E.v). One detached accessory building is allowed on lots under 21,780 square feet, two on larger lots (Section 4.19.1.J).
Height: in R-1 through R-4, RT, RM-1, MH, OS-1, B-1, P-1, and NCC, a detached accessory building is capped at 1 story or 14 feet; in other districts, including RA, it may reach the district height limit with 1 extra foot of setback per foot over 14 feet (Section 4.19.1.I). Buildings over 200 square feet must use materials and architecture compatible with the house, with a minimum 3/12 roof pitch (Section 4.19.1.L). Using a detached accessory building for anything besides parking and storage of vehicles, tools, recreation equipment, or dog houses requires Zoning Board of Appeals approval (Section 4.19.1.K).