Can you build an ADU in Beacon, NY?

One-Family Residence 120,000 Square Feet, One-Family Residence 80,000 Square Feet, One-Family Residence 40,000 Square Feet, One-Family Residence 20,000 Square Feet, One-Family Residence 10,000 Square Feet, One-Family Residence 7,500 Square Feet - No building may contain more than 1 dwelling unit. On a development proposal covering more than three acres, lot area per dwelling unit is calculated on net acreage (§ 223-63).

• Surface water, federal regulatory floodway, state or federally regulated wetland, and predevelopment slopes of 25% or steeper come off the lot area first.
• The overall lot minimum and the land per dwelling unit both bind.
• Height is also capped at 2 1/2 stories.

One-Family Residence 5,000 Square Feet - The minimum lot is 5,000 sq ft but the area per unit is 2,500 sq ft, so two dwelling units are allowed on it, and no building may contain more than 2 dwelling units.

• On a development proposal covering more than three acres, lot area per dwelling unit is calculated on net acreage (§ 223-63).
• Surface water, federal regulatory floodway, state or federally regulated wetland, and predevelopment slopes of 25% or steeper come off the lot area first.
• Height is also capped at 2 1/2 stories.

Residence District 7,500 Square Feet per Unit - A multifamily building may cover only 15% of the lot, and no building may contain more than 12 dwelling units. The front yard is a range of 20 to 35 ft rather than a plain minimum.

• The Planning Board may allow lots as small as 1,800 sq ft for attached or semi-attached single-family homes if gross tract density stays within what the district allows for multiple dwellings.
• For such a subdivision side yards may be cut to zero, but an end unit keeps at least half the side yard of the least restrictive adjoining residential district.
• A multifamily development needs 2,000 sq ft of landscaped recreation or usable open space for the first 20 dwelling units and 100 sq ft for each unit beyond that.
• Buildings on the same lot must stand at least 30 ft apart, and height is also capped at 3 stories.
• On proposals over three acres, lot area per dwelling unit is calculated on net acreage (§ 223-63).
• Surface water, federal regulatory floodway, state or federally regulated wetland, and predevelopment slopes of 25% or steeper come off the lot area first.

Residence District 6,000 Square Feet per Unit - A multifamily building may cover only 15% of the lot, and no building may contain more than 16 dwelling units.

• The Planning Board may allow lots as small as 1,800 sq ft for attached or semi-attached single-family homes if gross tract density stays within what the district allows for multiple dwellings.
• For such a subdivision side yards may be cut to zero, but an end unit keeps at least half the side yard of the least restrictive adjoining residential district.
• A multifamily development needs 2,000 sq ft of landscaped recreation or usable open space for the first 20 dwelling units and 100 sq ft for each unit beyond that.
• Buildings on the same lot must stand at least 30 ft apart, and height is also capped at 2 1/2 stories.
• On proposals over three acres, lot area per dwelling unit is calculated on net acreage (§ 223-63).
• Surface water, federal regulatory floodway, state or federally regulated wetland, and predevelopment slopes of 25% or steeper come off the lot area first.

Residence District 5,000 Square Feet per Unit - A multifamily building may cover only 20% of the lot, and no building may contain more than 16 dwelling units.

• The Planning Board may allow lots as small as 1,800 sq ft for attached or semi-attached single-family homes if gross tract density stays within what the district allows for multiple dwellings.
• For such a subdivision side yards may be cut to zero, but an end unit keeps at least half the side yard of the least restrictive adjoining residential district.
• A multifamily development needs 2,000 sq ft of landscaped recreation or usable open space for the first 20 dwelling units and 100 sq ft for each unit beyond that.
• Buildings on the same lot must stand at least 30 ft apart, and height is also capped at 3 stories.
• On proposals over three acres, lot area per dwelling unit is calculated on net acreage (§ 223-63).
• Surface water, federal regulatory floodway, state or federally regulated wetland, and predevelopment slopes of 25% or steeper come off the lot area first.

Residence District 4,000 Square Feet per Unit - A multifamily building may cover only 20% of the lot, and no building may contain more than 20 dwelling units.

• The Planning Board may allow lots as small as 1,800 sq ft for attached or semi-attached single-family homes if gross tract density stays within what the district allows for multiple dwellings.
• For such a subdivision side yards may be cut to zero, but an end unit keeps at least half the side yard of the least restrictive adjoining residential district.
• A multifamily development needs 2,000 sq ft of landscaped recreation or usable open space for the first 20 dwelling units and 100 sq ft for each unit beyond that.
• Buildings on the same lot must stand at least 30 ft apart, and height is also capped at 2 1/2 stories.
• On proposals over three acres, lot area per dwelling unit is calculated on net acreage (§ 223-63).
• Surface water, federal regulatory floodway, state or federally regulated wetland, and predevelopment slopes of 25% or steeper come off the lot area first.

Residence District 3,000 Square Feet per Unit - A multifamily building may cover only 20% of the lot, and no building may contain more than 24 dwelling units.

• The Planning Board may allow lots as small as 1,800 sq ft for attached or semi-attached single-family homes if gross tract density stays within what the district allows for multiple dwellings.
• For such a subdivision side yards may be cut to zero, but an end unit keeps at least half the side yard of the least restrictive adjoining residential district.
• A multifamily development needs 2,000 sq ft of landscaped recreation or usable open space for the first 20 dwelling units and 100 sq ft for each unit beyond that.
• Buildings on the same lot must stand at least 30 ft apart, and height is also capped at 3 1/2 stories.
• On proposals over three acres, lot area per dwelling unit is calculated on net acreage (§ 223-63).
• Surface water, federal regulatory floodway, state or federally regulated wetland, and predevelopment slopes of 25% or steeper come off the lot area first.

Residence District 1,800 Square Feet per Unit - No more than 65% of the dwelling units in a development may be in buildings over 3 1/2 stories, and no building of 3 1/2 stories or less may hold more than 24 units. A multifamily building may cover only 25% of the lot.

• Height is also capped at 10 stories.
• The Planning Board may allow lots as small as 1,800 sq ft for attached or semi-attached single-family homes if gross tract density stays within what the district allows for multiple dwellings.
• For such a subdivision side yards may be cut to zero, but an end unit keeps at least half the side yard of the least restrictive adjoining residential district.
• A multifamily development needs 2,000 sq ft of landscaped recreation or usable open space for the first 20 dwelling units and 100 sq ft for each unit beyond that.
• Buildings on the same lot must stand at least 30 ft apart.
• On proposals over three acres, lot area per unit is net of surface water, federal regulatory floodway, state or federally regulated wetland and predevelopment slopes of 25% or steeper (§ 223-63).

Residence District 1,700 Square Feet per Unit - One story of parking underneath a building does not count toward the story or height limit, and no building may exceed 150 ft in length. A multifamily building may cover only 25% of the lot, and no building may contain more than 36 dwelling units.

• Height is also capped at 4 1/2 stories.
• The Planning Board may allow lots as small as 1,800 sq ft for attached or semi-attached single-family homes if gross tract density stays within what the district allows for multiple dwellings.
• For such a subdivision side yards may be cut to zero, but an end unit keeps at least half the side yard of the least restrictive adjoining residential district.
• A multifamily development needs 2,000 sq ft of landscaped recreation or usable open space for the first 20 dwelling units and 100 sq ft for each unit beyond that.
• Buildings on the same lot must stand at least 30 ft apart.
• On proposals over three acres, lot area per unit is net of surface water, federal regulatory floodway, state or federally regulated wetland and predevelopment slopes of 25% or steeper (§ 223-63).

Transitional - Lot area per dwelling unit is half the minimum lot size per dwelling unit of the least restrictive adjoining residential district, so it depends on what the parcel adjoins.

• The Planning Board may allow lots as small as 1,800 sq ft for attached or semi-attached single-family homes if gross tract density stays within what the district allows for multiple dwellings.
• For such a subdivision side yards may be cut to zero, but an end unit keeps at least half the side yard of the least restrictive adjoining residential district.
• A multifamily development needs 2,000 sq ft of landscaped recreation or usable open space for the first 20 dwelling units and 100 sq ft for each unit beyond that.
• Height is also capped at 2 1/2 stories.

General Business - General Business sets no overall minimum lot area, no lot width and no coverage limit. Where dwellings are built it takes 1,500 sq ft of lot area per dwelling unit, and lot depth must be at least 100 ft.

Corridor Mixed-Use Service - The front yard is a range of 0 to 10 ft rather than a plain minimum, and at least 10% of the lot must be open space.

• Height is also capped at 3 stories.

Linkage - The front yard is a range of 0 to 20 ft and the side yard a range of 0 to 30 ft, rather than plain minimums. At least 15% of the lot must be open space.

• Height is also capped at 4 stories.

Fishkill Creek Development - At least 30% of the lot must be open space, and the overall lot minimum and 3,960 sq ft per dwelling unit both bind. On a development proposal covering more than three acres, lot area per dwelling unit is calculated on net acreage (§ 223-63).

• Surface water, federal regulatory floodway, state or federally regulated wetland, and predevelopment slopes of 25% or steeper come off the lot area first.
• Height is also capped at 3 stories.

Waterfront Park - Height is capped at 2 1/2 stories as well as 35 ft.

Transit Station - Height by location: north of West Main Street an average of four stories over parking and no more than an average of 75 ft above the existing Metro-North parking grade; south of the LI district an average of three stories, 32 ft at Beekman Street and 70 ft above that grade.

• At least 15% of the site must be open space, of which 10% must be publicly accessible.
• Yards and the rest of the dimensional rules come from Article IVA.

Light Industrial - At least 20% of the lot must be open space.

• The overall lot minimum and 1,500 sq ft of lot area per dwelling unit both bind.

Heavy Industrial - At least 20% of the lot must be open space.