What it costs to build an ADU in Washingtonville, NY

Residential-Agricultural - On a corner lot, the side yard on the street side must be 45 ft. The lot and yard figures for R-A apply whether or not a community sanitary or water plant reaches the lot, so a single schedule governs either way.

• Farm animals and odour- or dust-producing materials may not be kept within 200 ft of any lot line.

Residential - The figures shown apply to land served by a community sanitary plant or water plant. Without both, the minimum lot is 40,000 square feet (0.9183 acre) on 150 ft of width, with a 45 ft front yard, 20 ft to one side and 50 ft for the pair, and 15% building coverage.

• On a corner lot, the side yard on the street side is 40 ft.
• Lot and yard requirements for the R-100 district are set out at § 315-15.

Residential - The figures shown apply to land served by a community sanitary or water plant. Land without both plants faces larger minimums: 40,000 square feet (0.9183 acre) of lot area on 150 ft of width.

• Without both a community sanitary plant and a water plant, the front yard is 45 ft, side yards are 20 ft on one side and 50 ft for the pair, and building coverage drops to 15%.
• On a corner lot, the side yard on the street side is 40 ft.

Multifamily Residential - The 10,000 square feet of land per dwelling unit is per unit, not per lot, so a four-unit building needs 40,000 square feet and an eight-unit building 80,000. The figures shown are the multiple-dwelling row where a community sanitary or water plant serves the lot.

• Where neither a community sanitary plant nor a water plant serves the lot, a multiple dwelling needs 150 ft of width, side yards of 50 ft on one side and 100 ft combined, and 10% coverage.
• Without both plants, a lot of at least 40,000 square feet is required for any building over 35 ft.
• A single-family house is a different row: 20,000 square feet where a community sanitary or water plant serves it, with a 40 ft front yard, 15 ft to one side and 40 ft combined.
• A single-family house with neither plant needs 40,000 square feet on 150 ft of width, with a 45 ft front yard, 20 ft to one side and 50 ft combined, and 15% coverage.
• No per-unit land figure applies to a single-family house.
• On a corner lot, the yard on the street side is 50 ft.

Mobile Home Court Residential - The figures shown apply to land served by a community sanitary or water plant. Without both, the minimum lot is 40,000 square feet (0.9183 acre) on 150 ft of width and building coverage falls to 15%.

• A mobile home court is not sized by this schedule: § 315-31 requires a court permit, issued only on a favourable recommendation from a majority of the Planning Board.
• That court permit rests on a site plan showing the court's lot layout, roads, walkways, parking, water lines, sanitary sewer and stormwater drainage.
• Without both plants, the front yard is 45 ft, the side yards are 20 ft to one side and 50 ft for the pair, and the rear yard is 50 ft.
• On a corner lot, the side yard on the street side is 40 ft.

Multiple Residence District - Two buildings on adjoining lots may be attached at a party wall on their common boundary. Each must then keep at least 10 ft on the side away from that wall, and the two outer side yards must total at least 25 ft, rather than the 5 ft and 12 ft a detached pair needs.

• The Planning Board may reduce the 35 ft front yard to 30 ft for any lot or group of lots where it finds the reduction necessary or desirable for site conditions.
• On a corner lot, the side yard on the street side is 30 ft.
• No maximum lot coverage is published for this district.

Office-Residential - Each dwelling unit takes 14,000 square feet of land, nearly the whole minimum lot, so a second unit needs 28,000 square feet whatever the lot minimum says.

• Site plan approval is required for any construction, reconstruction or alteration, and for any change in use or in intensity of use.
• On a corner lot, the side yard on the street side is 20 ft.

Neighborhood Business - The figures shown apply to a business center development. Any other permitted use falls under a far looser row: a minimum lot area of 0 acres, a lot width of 0 ft, a 20 ft front yard, side yards of 0 ft, a 20 ft rear yard, and building coverage up to 60%.

• A side yard on the street side of a corner lot is 60 ft.
• For a use other than a business center development, the Planning Board may approve a side yard of less than 12 ft where one is provided.
• Lot and yard requirements for the N-B district are set out in § 315-57.

General Business - The figures shown apply to a business center development. Any other permitted use falls under a much looser row: a minimum lot area of 0 acres, a lot width of 0 ft, a 20 ft front yard, a 20 ft rear yard and coverage up to 60%.

• For a use other than a business center development, the side yard is 0 ft on either side, and 0 ft for the two combined.
• Where a side yard is provided for one of these other uses, the Planning Board may approve a side yard of less than 12 ft.
• On a corner lot, the yard on the street side is 60 ft.
• Standards for the district appear at § 315-62.

Planned Adult Community - R-PAC is a floating district for an age-restricted community, sized as a whole site rather than as a single lot, and everything here runs through a site development plan approved by the Planning Board.

• The 30 ft setback is a perimeter one: no building or structure may stand within 30 ft of any exterior boundary line, other than garages, entrance gatehouses, walls or fences.
• The 20% building coverage cap counts principal and accessory buildings together against the gross area.
• Density is capped at seven dwelling units per gross acre.
• Height is limited to 35 ft or 2 1/2 stories, whichever is less.
• Flagpoles, domes, spires, chimneys, skylights and antennas are exempt from the height limit so long as they rise no higher than they must.
• The 20 acre minimum area applies to the community as a site, not to an individual lot.