Westchester County
Town of New Castle, NY: zoning for new construction
Residential lots in the Town of New Castle run from a 0.26-acre minimum in One-Family Residence District up to 2 acres in One-Family Residence District, across 17 zoning districts in all. No local short-term-rental law on record - which is not the same as permission. Power here is Con Edison territory. The district table below has the setbacks, height limits and coverage - confirm the specifics with the building department at (914) 238-4723 before you rely on a figure.
Looking specifically at an accessory dwelling unit? See ADU rules for New Castle →
Zoning districts
| District | Min lot | Setbacks F / S / R | Max height | ADU |
|---|---|---|---|---|
| Multifamily Planned Development District | 5 ac | 50 / 20 / 20 ft | 35 ft | No |
| One-Family Residence District | 2 ac | 75 / 45 / 60 ft | 35 ft | Occupancy restricted |
| One-Family Residence District | 2 ac | 75 / 45 / 60 ft | 35 ft | Occupancy restricted |
| Multifamily Residence District - Chappaqua | 1 ac | 50 / - / - ft | 35 ft | No |
| Multifamily Residence District - Millwood | 1 ac | 50 / 15 / 15 ft | 35 ft | No |
| One-Family Residence District | 0.5 ac | 50 / 20 / 40 ft | 35 ft | Occupancy restricted |
| One-Family Residence District | 0.5 ac | 50 / 20 / 40 ft | 35 ft | Occupancy restricted |
| One-Family Residence District | 1 ac | 60 / 35 / 50 ft | 35 ft | Occupancy restricted |
| One-Family Residence District | 1 ac | 60 / 35 / 50 ft | 35 ft | Occupancy restricted |
| One-Family Residence District | 1 ac | 60 / 35 / 50 ft | 35 ft | Occupancy restricted |
| One-Family Residence District | 0.26 ac | 40 / 10 / 35 ft | 35 ft | Occupancy restricted |
| Research and Office Business | 20 ac | 150 / 300 / 300 ft | 40 ft | No |
| Designed Business | — | 10 / 0 / 20 ft | 30 ft | No |
| Retail Business | — | 10 / 0 / 0 ft | 35 ft | No |
| Retail Business and Parking | — | 10 / 0 / 0 ft | 35 ft | No |
| General Industrial | 0.17 ac | 25 / 8 / 20 ft | 30 ft | No |
| Planned Industrial | 15 ac | 100 / 100 / 100 ft | 30 ft | No |
Multifamily Planned Development District - Density is set by land per dwelling unit: at least 4,400 sq ft for an efficiency, 6,600 for one bedroom, 8,800 for two, 11,000 for three, and 13,200 for four bedrooms or a one-family detached dwelling.
- The five acres is the whole development, and lots inside a development subdivided on a Planning Board plan have no minimum.
- Where the lot adjoins a one-family residence district, the side and rear yards must be at least 30 ft or one and one-half times the height of the building, whichever is greater.
- Coverage counts nonwetland area plus 33% of wetland area and excludes parking wholly underground, and wetland area counts at one third toward density.
- The board approving the concept plan may grant an incentive increase above that density.
- Each dwelling unit needs at least 450 sq ft of floor area for an efficiency, 650 for one bedroom, 750 for two, 1,000 for three and 1,200 for four.
- Three- and four-bedroom units must have at least one and one-half baths.
One-Family Residence District - Building coverage, development coverage and floor area are capped in square feet on a sliding scale by lot area. On a lot of 87,120 sq ft or more, buildings may cover 5,739 sq ft plus 2% of the area above 87,120 sq ft.
- Development coverage on such a lot is 13,098 sq ft plus 7% of the area above 87,120 sq ft, counting all buildings and structures, including driveways, parking areas, walks, decks and terraces.
- Floor area, counting half of garage and basement floors, is capped at 7,841 sq ft on a lot of 87,120 to 98,010 sq ft, rising in steps to 10,193 sq ft below 196,020 sq ft.
- A lot holding a single-family affordable AFFH unit needs 75% of the lot area, and one holding a two-family affordable AFFH unit needs the one-family lot area.
- No more than 10% of the minimum lot area may be under water, floodway or wetland.
- A yard equal to the front yard is required along every lot line that abuts a street, and no accessory building, deck, porch or terrace may stand in a required yard.
- A multifamily designed residential development needs a Planning Board special permit and a site at least 100 times the one-family lot minimum, at 10% building and 20% development coverage.
One-Family Residence District - A lot lying in both R-2A and R-1A must meet the most stringent lot area, setbacks, building coverage and development coverage of either (§ 60-330), and R-2A ranks as the more restrictive, so its figures apply.
- On a lot of 87,120 sq ft or more, building coverage is capped at 5,739 sq ft plus 2% of the area above 87,120 sq ft.
- Development coverage on such a lot is 13,098 sq ft plus 7% of the area above 87,120 sq ft, counting all buildings and structures, including driveways, parking areas, walks, decks and terraces.
- Floor area, counting half of garage and basement floors, is capped at 7,841 sq ft on a lot of 87,120 to 98,010 sq ft, rising in steps to 10,193 sq ft below 196,020 sq ft.
- No more than 10% of the minimum lot area may be under water, floodway or wetland.
- A yard equal to the front yard is required along every lot line that abuts a street, and no accessory building, deck, porch or terrace may stand in a required yard.
- A multifamily designed residential development needs a Planning Board special permit and a site at least 100 times the one-family lot minimum, at 10% building and 20% development coverage.
Multifamily Residence District - Chappaqua - Basic density, by right with site plan approval, is set by land per dwelling unit: at least 2,200 sq ft for an efficiency, 3,300 for one bedroom, 4,400 for two, 5,500 for three, and 6,600 for four bedrooms or a one-family detached dwelling.
- A Planning Board special permit may raise that density by up to 100% for incentive features such as affordable, senior, handicapped or rental units, underground parking or recreation facilities.
- A development of five to nine units must include one affordable AFFH unit, and one of 10 or more units at least 10%.
- Every unit must connect to public water and sewer.
- The one acre is the whole development, and lots inside a development subdivided on a Planning Board plan have no minimum.
- Coverage counts nonwetland area plus 33% of wetland area and excludes parking wholly underground, and wetland area counts at one third toward density.
Multifamily Residence District - Millwood - Where the lot adjoins a one-family residence district, the side and rear yards must be at least 25 ft or the height of the building, whichever is greater.
- Density is set by land per dwelling unit, at least 3,300 sq ft for an efficiency, 4,950 for one bedroom and 6,600 for two, by right with site plan approval.
- It is at least 8,250 sq ft for a three-bedroom unit and 9,900 for four bedrooms or a one-family detached dwelling.
- A Planning Board special permit may raise that density by up to 100% for incentive features such as affordable, senior, handicapped or rental units, underground parking or recreation facilities.
- A development of five to nine units must include one affordable AFFH unit, and one of 10 or more units at least 10%.
- Sites are to be served by public or community water and sewer.
- The one acre is the whole development, and lots inside a development subdivided on a Planning Board plan have no minimum.
One-Family Residence District - Where there is no municipal water main within 200 feet of the existing or proposed building, the minimum lot reverts to the R-1A requirement of one acre.
- On a lot of 21,780 to 43,560 sq ft, building coverage is capped at 3,343 sq ft plus 5% of the area above 21,780 sq ft.
- Development coverage on such a lot is 5,475 sq ft plus 15% of the area above 21,780 sq ft, counting all buildings and structures, including driveways, parking areas, walks, decks and terraces.
- Floor area, counting half of garage and basement floors, is capped at 4,792 sq ft on a lot of 21,780 to 24,200 sq ft, rising in steps to 5,770 sq ft at 38,720 sq ft or more.
- No more than 10% of the minimum lot area may be under water, floodway or wetland.
- A yard equal to the front yard is required along every lot line that abuts a street, and no accessory building, deck, porch or terrace may stand in a required yard.
- A multifamily designed residential development needs a Planning Board special permit and a site at least 100 times the one-family lot minimum, at 10% building and 20% development coverage.
One-Family Residence District - A lot lying in both R-1/2A and R-1/4A must meet the most stringent lot area, setbacks and coverage of either (§ 60-330), and R-1/2A is the more restrictive. Where no municipal water main lies within 200 ft of the existing or proposed building, the lot must be at least one acre.
- On a lot of 21,780 to 43,560 sq ft, building coverage is capped at 3,343 sq ft plus 5% of the area above 21,780 sq ft.
- Development coverage on such a lot is 5,475 sq ft plus 15% of the area above 21,780 sq ft, counting all buildings and structures, including driveways, parking areas, walks, decks and terraces.
- Floor area, counting half of garage and basement floors, is capped at 4,792 sq ft on a lot of 21,780 to 24,200 sq ft, rising in steps to 5,770 sq ft at 38,720 sq ft or more.
- No more than 10% of the minimum lot area may be under water, floodway or wetland.
- A yard equal to the front yard is required along every lot line that abuts a street, and no accessory building, deck, porch or terrace may stand in a required yard.
- A multifamily designed residential development needs a Planning Board special permit and a site at least 100 times the one-family lot minimum, at 10% building and 20% development coverage.
One-Family Residence District - Building coverage, development coverage and floor area are capped in square feet on a sliding scale by lot area. On a lot of 43,560 to 87,120 sq ft, buildings may cover 4,432 sq ft plus 3% of the area above 43,560 sq ft.
- Development coverage on such a lot is 8,742 sq ft plus 10% of the area above 43,560 sq ft, counting all buildings and structures, including driveways, parking areas, walks, decks and terraces.
- Floor area, counting half of garage and basement floors, is capped at 6,098 sq ft on a lot of 43,560 to 48,400 sq ft, rising in steps to 7,320 sq ft at 77,440 sq ft or more.
- A lot holding a single-family affordable AFFH unit needs 75% of the lot area, and one holding a two-family affordable AFFH unit needs the one-family lot area.
- No more than 10% of the minimum lot area may be under water, floodway or wetland.
- A yard equal to the front yard is required along every lot line that abuts a street, and no accessory building, deck, porch or terrace may stand in a required yard.
- A multifamily designed residential development needs a Planning Board special permit and a site at least 100 times the one-family lot minimum, at 10% building and 20% development coverage.
One-Family Residence District - A lot lying in both R-1A and R-1/2A must meet the most stringent lot area, setbacks, building coverage and development coverage of either (§ 60-330), and R-1A ranks as the more restrictive, so its figures apply.
- On a lot of 43,560 to 87,120 sq ft, building coverage is capped at 4,432 sq ft plus 3% of the area above 43,560 sq ft.
- Development coverage on such a lot is 8,742 sq ft plus 10% of the area above 43,560 sq ft, counting all buildings and structures, including driveways, parking areas, walks, decks and terraces.
- Floor area, counting half of garage and basement floors, is capped at 6,098 sq ft on a lot of 43,560 to 48,400 sq ft, rising in steps to 7,320 sq ft at 77,440 sq ft or more.
- No more than 10% of the minimum lot area may be under water, floodway or wetland.
- A yard equal to the front yard is required along every lot line that abuts a street, and no accessory building, deck, porch or terrace may stand in a required yard.
- A multifamily designed residential development needs a Planning Board special permit and a site at least 100 times the one-family lot minimum, at 10% building and 20% development coverage.
One-Family Residence District - A lot lying in both R-1A and R-1/4A must meet the most stringent lot area, setbacks, building coverage and development coverage of either (§ 60-330), and R-1A ranks as the more restrictive, so its figures apply.
- On a lot of 43,560 to 87,120 sq ft, building coverage is capped at 4,432 sq ft plus 3% of the area above 43,560 sq ft.
- Development coverage on such a lot is 8,742 sq ft plus 10% of the area above 43,560 sq ft, counting all buildings and structures, including driveways, parking areas, walks, decks and terraces.
- Floor area, counting half of garage and basement floors, is capped at 6,098 sq ft on a lot of 43,560 to 48,400 sq ft, rising in steps to 7,320 sq ft at 77,440 sq ft or more.
- No more than 10% of the minimum lot area may be under water, floodway or wetland.
- A yard equal to the front yard is required along every lot line that abuts a street, and no accessory building, deck, porch or terrace may stand in a required yard.
- A multifamily designed residential development needs a Planning Board special permit and a site at least 100 times the one-family lot minimum, at 10% building and 20% development coverage.
One-Family Residence District - Where there is no municipal water main within 200 feet of the existing or proposed building, the minimum lot reverts to the R-1A requirement of one acre.
- On a lot of 11,250 to 21,780 sq ft, building coverage is capped at 2,500 sq ft plus 8% of the area above 11,250 sq ft, and at 22% on a smaller lot.
- Development coverage on such a lot is 4,000 sq ft plus 14% of the area above 11,250 sq ft, and 35% on a smaller lot.
- Floor area, counting half of garage and basement floors, is capped at 3,158 sq ft on a lot of 10,890 to 12,100 sq ft, rising in steps to 4,100 sq ft at 18,150 sq ft or more.
- No more than 10% of the minimum lot area may be under water, floodway or wetland.
- A yard equal to the front yard is required along every lot line that abuts a street, and no accessory building, deck, porch or terrace may stand in a required yard.
- A multifamily designed residential development needs a Planning Board special permit and a site at least 100 times the one-family lot minimum, at 10% building and 20% development coverage.
Research and Office Business - The front yard may be reduced to 50 ft for a one-story gatehouse or security office, which must still sit at least 150 ft from a residence district.
- On a development plan the Planning Board may cut that 150 ft to no less than 60 ft for equivalent screening, or where the lot abuts a utility or railroad right-of-way or a limited-access highway.
- The side and rear yards may be reduced to 100 ft where the lot adjoins a lot in a business or industrial district, and to 50 ft for a one-story gatehouse or security office.
- Parking and loading areas must be at least 100 ft from the front, side and rear lot lines.
- A driveway must be at least 100 ft from a side or rear lot line abutting a residence district unless the Planning Board approves less.
- The bulk and dimensional regulations do not apply to a property on which an existing building is adaptively reused for residential use.
- A buffer screening strip at least 10 ft wide is required along any lot line abutting a residence district (§ 60-420D(2)).
Designed Business - The front yard rises to 75 ft where off-street parking sits in it. Any side yard that is provided must be at least 6 ft, and at least 75 ft if parking sits in it.
- Multifamily dwellings follow the standards of the MFR-C district, including its land per dwelling unit density ladder, at 20% building and 35% development coverage.
- A side yard must be at least 10 ft where it adjoins a street and at least 25 ft where it is used as access to off-street parking.
- The rear yard must be at least 25 ft where it is used as access to off-street parking and at least 50 ft where the lot adjoins a residence district.
- No rear yard is required where the lot abuts the side line of a business lot.
- Parking and loading areas must be at least 15 ft from the lot lines, or less between adjoining business parking areas with Planning Board approval.
- A buffer screening strip at least 10 ft wide is required along any lot line abutting a residence district (§ 60-420D(2)).
Retail Business - The front yard rises to 75 ft where off-street parking sits in it. No side yard is required where the lot abuts a business lot, but any side yard that is provided must be at least 6 ft.
- Multifamily dwellings follow the standards of the MFR-C district, including its land per dwelling unit density ladder, at 20% building and 35% development coverage.
- A side yard must be at least 10 ft where it adjoins a street and at least 25 ft where it is used as access to off-street parking.
- A building must be at least 2 stories and 30 ft high unless its use is exempt from that rule, and any story above the street level floor must be fitted for later residential use (§ 60-410C).
- Apartments are allowed above or below the street level floor of a nonresidential building (§ 60-410H(6)).
- Workforce housing by Town Board special permit, on lots within 1500 ft of the Chappaqua railroad station, uses the B-R lot and bulk figures (§ 60-430O(15)).
- A buffer screening strip at least 10 ft wide is required along any lot line abutting a residence district (§ 60-420D(2)).
Retail Business and Parking - Buildings must sit within the building areas shown on the adopted B-RP Zoning District Map, and floor area may not exceed 2.0 times the designated building area.
- By North Greeley Net Zero Carbon special permit a mixed-use building may reach 50 ft and four stories, free of that floor area limit, though the Town Board may set a lower height.
- That permit needs a lot of at least 33,000 sq ft on the west side of North Greeley Avenue, not a corner lot, with ground floor retail or commercial use.
- A building must be at least 2 stories and 30 ft high unless its use is exempt from that rule, and any story above the street level floor must be fitted for later residential use (§ 60-410C).
- No side or rear yard is required where the lot abuts a business lot; one that is provided must be at least 6 ft, 10 ft where it adjoins a street and 25 ft where used for access to off-street parking.
- Under that permit, land per dwelling unit is at least 375 sq ft for an efficiency, 500 for one bedroom and 750 for two.
- A buffer screening strip at least 10 ft wide is required along any lot line abutting a residence district (§ 60-420D(2)).
General Industrial - The side yard and the rear yard must each be at least 25 ft along any street.
- The minimum average lot width is 60 ft.
- Workforce housing by Town Board special permit, on lots within 500 ft of the Chappaqua railroad station, uses the B-R lot and bulk figures (§ 60-430O(15)).
- Parking and loading areas need no setback.
- A buffer screening strip at least 10 ft wide is required along any lot line abutting a residence district (§ 60-420D(2)).
Planned Industrial - The yard from a residence district must be at least 150 ft, which the Planning Board may cut on a development plan to no less than 60 ft for equivalent screening, or where the lot abuts a utility or railroad right-of-way or a limited-access highway.
- The lot need only be at least 7.5 acres where it abuts a railroad or limited-access highway right-of-way.
- The 100 ft yard applies to the front, side and rear lot lines alike.
- Parking and loading areas must be at least 25 ft from the front, side and rear lot lines, and a driveway at least 50 ft from a side or rear lot line abutting a residence district.
- A buffer screening strip at least 10 ft wide is required along any lot line abutting a residence district (§ 60-420D(2)).
Short-term rentals
No local short-term-rental law on record - which is not the same as permission. The Town of New Castle has no local short-term rental law, and that is not the same as permission. Confirm with the building department before counting on the use.
Conditions the code attaches:
- Standard town zoning and building codes apply.
- The Westchester County hotel occupancy tax of 3% applies to short-term stays.
- Building department: (914) 238-4723.
Good to know
- UtilityCon Edison territory.
- Zoning codeTown of New Castle Code, Chapter 60 Zoning, adopted 6-21-1971, current through 6-23-2026
- Building dept(914) 238-4723
- Last reviewed2026-09-21
Working out a budget? A standard-finish build here runs $242–$318/sq ft , and a conforming lot adds about $3,035 on top - see the full cost to build a house in New Castle, or what an ADU costs here.
Sizing up a specific parcel in New Castle?
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Zoning figures for Town of New Castle are compiled from the municipal code (last reviewed 2026-09-21) and provided for decision-support only - not legal, engineering, or architectural advice. Setback and dimensional standards often carry conditions and exceptions; verify with the building department at (914) 238-4723 before relying on any number. Source: the Offsite / Aldo zoning dataset.