Can you build an ADU in Sidney, NY?

Sidney Center Hamlet - The minimum lot size shown applies to lots served by sewers: 7,200 sq ft, and not less than 3,500 sq ft per dwelling unit. Without sewer service the minimum is 20,000 sq ft, and not less than 10,000 sq ft per dwelling unit.

• Side and rear yards of 25 ft govern a primary structure such as a house. An accessory structure such as a garage or shed keeps 10 ft.
• Above one dwelling the per unit land figure binds: a two-family fits a 7,200 sq ft sewered lot but needs the full 20,000 sq ft without sewers.
• Height is measured from the lowest ground elevation, a stricter measure than average grade on a sloping lot.
• The 75 ft lot width is measured at the building line.
• No maximum lot coverage is set in this district. The only lot coverage figure in the Town's zoning laws sits in CPD (Common Plan of Development Overlay).

Residential - The minimum lot size turns on sewer service: 7,200 sq ft where the lot is served by sewers, 20,000 sq ft where it is not. Settle which tier applies before relying on the figure shown.

• Anything above one dwelling is governed by the per-unit land requirement: not less than 3,500 sq ft per dwelling unit on a sewered lot, and not less than 10,000 sq ft per dwelling unit without sewers.
• The 25 ft side and rear yards apply to a primary structure. An accessory structure such as a garage or shed keeps 10 ft.
• The 100 ft lot width is measured at the building line.
• Height is measured from the lowest ground elevation.
• No lot coverage maximum is set in this district.
• Uses are those of the SC-R (Sidney Center Hamlet) district, any use permitted and as regulated there, under § 602-C.

Residential-Agricultural - Beyond the 100 ft width at the building line, § 702 also requires 250 ft of minimum road frontage. A five-acre parcel that is 100 ft wide at the building line but has less than 250 ft on the road does not conform, so size any subdivision against the 250 ft.

• The 25 ft side and rear yards govern a primary structure such as a house; an accessory structure like a garage or shed keeps 10 ft.
• Farm structures are expressly exempt from any height limit under § 703(2); the 36 ft and 2.5 storey limits apply to a residential building.
• No lot coverage maximum is set in this district. The only lot coverage figure in the town's zoning laws sits in CPD (Common Plan of Development Overlay).

Maywood - Every use in MD requires a special use permit, so nothing is available as of right. There is no fixed minimum lot size: under § 601-B(4) the lot must be large enough to accommodate the proposed use as determined by the Planning Board during site plan review.

• Accessory structures such as a garage or shed keep 10 ft side and rear yards rather than the 25 ft that applies to a primary structure.
• The 36 ft height limit is measured from the lowest ground elevation.
• No lot coverage maximum is set in this district.
• No lot width or road frontage figure is stated for this district.
• § 600-B takes in the Sidney Center Hamlet district use list, and § 600-B-A adds small retail, personal service shops, galleries, large wind turbines and commercial solar arrays.

Commercial - Minimum lot area is whatever the Planning Board determines is needed to accommodate the proposed use during site plan review (§ 801(8)). Lot width and lot coverage are not set either, so the buildable envelope is fixed case by case rather than by right.

• The 25 ft side and rear yards govern a primary structure; an accessory structure such as a garage or shed keeps 10 ft.
• Height is measured from the lowest ground elevation.
• The CPD (Common Plan of Development Overlay) carries the only lot coverage figure in the town's zoning laws.

Common Plan of Development Overlay - The 30% coverage cap is defined in § 300 to count paved parking and other impervious surfaces along with principal and accessory buildings, so on a large site it works as an impervious cap rather than a building footprint cap.

• This is an overlay applied on top of a base district; height, front setback and side and rear setbacks are the same as the underlying district.
• Where adjacent lots are developed, no new building line may cross the front plane of the closest buildings on those lots, which can bind harder than the underlying district's front setback.
• The 250 ft figure is the frontage requirement; § 507-B sets no separate width at the building line.
• A maximum lot depth-to-width ratio of 4:1 also applies.
• Applications for subdivision, site plan approval or a special use permit must notify every property within 1,000 ft of the parcel's outside border by certified mail, with proof of mailing.