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Croton-on-Hudson · ADU cost

What it costs to build an ADU in Croton-on-Hudson, NY

800 sq ft ≈ $235k–310k $296–388/sq ft 19 districts Con Edison

An 800 sq ft accessory dwelling unit in Croton-on-Hudson runs roughly $235k–310k, or about $296–388/sq ft, and that per-square-foot figure sits deliberately above the $242–318/sq ft a full house costs here. An ADU still needs one whole kitchen, one whole bath, its own service panel and its own heating plant no matter how small you draw it, and those costs do not shrink with the floor plan, so they land on half the square footage and push the rate up. Whether the village will let you build one is a separate question from what it costs, and it gets answered parcel by parcel rather than townwide, since the Village of Croton-on-Hudson maps 19 districts that treat accessory units differently from one another, so read the table below as a starting point rather than a verdict.

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ADU cost by size in Croton-on-Hudson

Standard finish, slab on grade, on a flat and clear part of the lot, general-contractor margin included. These are structure costs at Westchester County pricing, before the service and septic work a second dwelling can trigger.

SizeType$ / sq ftEstimated total
400 sq ft Studio $392–$514 $155k–205k
600 sq ft One bedroom $328–$430 $195k–260k
800 sq ft One bedroom, larger $296–$388 $235k–310k
1,000 sq ft Two bedroom $277–$362 $275k–360k

400 sq ft — One room plus a bath. Garage conversions and small backyard cottages land here.

600 sq ft — The most common detached build - a real bedroom, full kitchen, one bath.

800 sq ft — Room for a proper living area. Still a single bath and one kitchen.

1,000 sq ft — About as large as most codes allow an accessory unit to go.

Why the rate is higher than a house

The systems below are priced for an 800 sq ft unit. The middle column is what each system would cost if it simply shrank with the floor plan; the left column is what it actually costs once you account for the equipment a dwelling needs one of regardless of size. The gap between the two columns is the whole reason small builds price the way they do.

System$ / sq ft in an ADUIf it scaled with floor areaFixed per unit
Site work $9–$13 $9 —
Foundation $19–$27 $19 —
Framing $30–$38 $30 —
Envelope - roof, siding, windows $38–$49 $38 —
Plumbing $33–$40 $19 55%
Electrical $22–$28 $15 35%
HVAC $27–$34 $17 45%
Insulation $9–$11 $9 —
Interior finishes $38–$51 $32 15%
Millwork & cabinetry $22–$33 $13 55%

The fixed-per-unit share is a modeling assumption, not a figure from the code: it is our estimate of how much of each system's budget buys equipment a dwelling needs exactly one of - a kitchen rough-in, a bath group, a service panel, a heating plant - and therefore does not shrink when the unit does. Site work, foundation, framing, envelope and insulation are treated as scaling straight with floor area, which understates the premium slightly, because a small building carries more envelope per square foot of floor than a large one.

What the Croton-on-Hudson code says about accessory units

Whether you can build one, and how large, is decided by the district your parcel sits in rather than by the town as a whole. The table shows how each mapped district treats ADUs alongside the lot and setback standards a second unit still has to fit inside. District boundaries and conditions vary, so treat it as a starting point and confirm the district that applies to your parcel.

District Min lot Setbacks F / S / R Max height ADU
One-Family Residence 0.57 ac 40 / 20 / 30 ft 35 ft Occupancy restricted
One-Family Residence 0.92 ac 50 / 30 / 40 ft 35 ft Occupancy restricted
One-Family Residence 1.38 ac 50 / 30 / 45 ft 35 ft Occupancy restricted
One-Family Residence 0.11 ac 15 / 8 / 25 ft 35 ft Occupancy restricted
One-Family Residence 0.22 ac 25 / 12 / 30 ft 35 ft Occupancy restricted
Waterfront Development 10 ac 20 / 20 / 20 ft 37 ft —
Multiple Residence 0.22 ac 25 / 12 / 30 ft 35 ft Occupancy restricted
Two-Family Residence 0.11 ac 20 / 8 / 25 ft 35 ft Occupancy restricted
Central Commercial — - / 0 / 0 ft 35 ft No
Riverside Commercial — - / 0 / 0 ft 35 ft No
Riverside Transition — 15 / 0 / 0 ft 35 ft No
General Commercial — 10 / 0 / 0 ft 35 ft No
Limited Office — 20 / 10 / 20 ft 35 ft Occupancy restricted
Limited Office 1 ac 25 / 25 / 25 ft 25 ft No
Light Industrial 3 ac 50 / 30 / 35 ft 40 ft No
Park, Recreation and Education (educational buildings) — 50 / 25 / 50 ft 35 ft No
Waterfront Commercial 1 ac 25 / 30 / 20 ft 20 ft No
Park, Recreation and Education (passive open space) — 50 / 25 / 50 ft 12 ft No
Unzoned — — — —

One-Family Residence - A lot held individually and separately since January 22, 1962 that falls short of the area or width minimum may still take a one-family house, with reduced side yards from the table in § 230-40G(1).

  • A lot short of the depth minimum may take one if the rear yard is at least 25% of the lot depth (§ 230-40G(2)).
  • A dwelling unit needs at least 1,200 square feet of habitable floor area, of which at least 880 square feet must be on the main floor.
  • Every permitted nonresidential use must instead meet the RA-60 standards, not the figures shown.
  • Several nonresidential uses need a special permit and a larger lot minimum, three acres for a school and five acres for an institution, hospital, nursing home or membership club (§ 230-9.1).
  • A one or two-family dwelling's front yard need not exceed the average setback of two or more existing dwellings within 300 feet on each side, on the same side of the street, block and district.
  • On a corner lot a front yard is required on both street frontages (§ 230-40C(2)).

One-Family Residence - A lot held individually and separately since January 22, 1962 that falls short of the area or width minimum may still take a one-family house, with reduced side yards from the table in § 230-40G(1).

  • A lot short of the depth minimum may take one if the rear yard is at least 25% of the lot depth (§ 230-40G(2)).
  • A dwelling unit needs at least 1,400 square feet of habitable floor area, of which at least 880 square feet must be on the main floor.
  • Every permitted nonresidential use must instead meet the RA-60 standards, not the figures shown.
  • Several nonresidential uses need a special permit and a larger lot minimum, three acres for a school and five acres for an institution, hospital, nursing home or membership club (§ 230-9.1).
  • A one or two-family dwelling's front yard need not exceed the average setback of two or more existing dwellings within 300 feet on each side, on the same side of the street, block and district.
  • On a corner lot a front yard is required on both street frontages (§ 230-40C(2)).

One-Family Residence - A lot held individually and separately since January 22, 1962 that falls short of the area or width minimum may still take a one-family house, with reduced side yards from the table in § 230-40G(1).

  • A lot short of the depth minimum may take one if the rear yard is at least 25% of the lot depth (§ 230-40G(2)).
  • A dwelling unit needs at least 1,400 square feet of habitable floor area, of which at least 880 square feet must be on the main floor.
  • By special permit: at least three acres for a school, five for a philanthropic or eleemosynary institution, hospital, sanitarium, nursing or convalescent home, home for the aged or membership club.
  • An accessory building may stand in a required side or rear yard if no more than 15 feet high and at least five feet from any lot line, and all of them together cover at most 30% of those yards.
  • A one or two-family dwelling's front yard need not exceed the average setback of two or more existing dwellings within 300 feet on each side, on the same side of the street, block and district.
  • On a corner lot a front yard is required on both street frontages (§ 230-40C(2)).

One-Family Residence - A lot held individually and separately since January 22, 1962 that falls short of the area or width minimum may still take a one-family house, with reduced side yards from the table in § 230-40G(1).

  • A lot short of the depth minimum may take one if the rear yard is at least 25% of the lot depth (§ 230-40G(2)).
  • Every permitted nonresidential use must instead meet the RA-60 standards, not the figures shown.
  • Several nonresidential uses need a special permit and a larger lot minimum, three acres for a school and five acres for an institution, hospital, nursing home or membership club (§ 230-9.1).
  • A one or two-family dwelling's front yard need not exceed the average setback of two or more existing dwellings within 300 feet on each side, on the same side of the street, block and district.
  • On a corner lot a front yard is required on both street frontages (§ 230-40C(2)).

One-Family Residence - A lot held individually and separately since January 22, 1962 that falls short of the area or width minimum may still take a one-family house, with reduced side yards from the table in § 230-40G(1).

  • A lot short of the depth minimum may take one if the rear yard is at least 25% of the lot depth (§ 230-40G(2)).
  • A dwelling unit needs at least 1,000 square feet of habitable floor area, of which at least 880 square feet must be on the main floor.
  • Every permitted nonresidential use must instead meet the RA-60 standards, not the figures shown.
  • Several nonresidential uses need a special permit and a larger lot minimum, three acres for a school and five acres for an institution, hospital, nursing home or membership club (§ 230-9.1).
  • A one or two-family dwelling's front yard need not exceed the average setback of two or more existing dwellings within 300 feet on each side, on the same side of the street, block and district.
  • On a corner lot a front yard is required on both street frontages (§ 230-40C(2)).

Waterfront Development - The district must be 10 or more contiguous acres of dry land in single ownership with at least 1,000 feet of Hudson River shoreline, and the whole tract is developed under one site development plan approved by the Planning Board.

  • Building coverage and floor area ratio are measured against the dry land area of the tract.
  • No building within 75 feet of the mean high-water line may exceed two stories and 25 feet, and no structure other than the special permit uses of § 230-22D(3) may stand within 25 feet of that line.
  • At least 20% of the tract must be open space and 10% must be developed as public recreational or cultural facilities, with at least half an acre in facilities of that kind.
  • The Planning Board may allow up to 5% more units if they are affordable, and those units need only 600 square feet of habitable floor area rather than 750.
  • No building may be longer than 250 feet, and buildings must stand at least 40 feet apart.
  • The Planning Board may allow a reduced setback from a street or lot line on a finding that adjacent land uses are still adequately separated.

Multiple Residence - The figures shown are for a one-family house (§ 230-34). A multiple residence in RC needs at least 4 acres, a lot at least 200 ft wide and 200 ft deep, and at least 3,000 sq ft of lot per dwelling unit.

  • A multiple residence's yards are 40 ft front, 25 ft on one side and 50 ft for both sides combined, and 30 ft rear.
  • A multiple residence is held to two stories and 30 feet, 30% building coverage and a floor area ratio of 0.55.
  • Each of its units needs 600 square feet of habitable floor area with at least 880 square feet on the main floor, and 400 square feet of usable open space.
  • No building may be longer than 160 feet, and the whole lot must stay in single ownership for the life of the building.
  • A two-family house is also allowed and follows the RB two-family standards (§ 230-14A(1)).
  • All permitted nonresidential uses follow the RA-40 standards, and one professional office or studio is allowed for each 20 dwelling units on the lot.

Two-Family Residence - The figures shown are for a one-family house (§ 230-34). A two-family residence in RB needs a lot at least 75 ft wide, with at least 2,500 sq ft of lot per dwelling unit.

  • A two-family residence's yards are 20 ft front, 12 ft on one side and 30 ft for both sides combined, and 30 ft rear.
  • A two-family house may rise to three stories, and each unit needs 600 square feet of habitable floor area and 400 square feet of usable open space.
  • The 2,500 square feet per dwelling unit takes the place of a total lot minimum.
  • All permitted nonresidential uses follow the RA-40 standards instead.
  • A lot held individually and separately since January 22, 1962 that is short of the area or width minimum may still take a one-family or two-family house, with reduced side yards (§ 230-40G(1)).
  • A one or two-family dwelling's front yard need not exceed the average setback of two or more existing dwellings within 300 feet on each side, on the same side of the street, block and district.

Central Commercial - No side or rear yard is required, but one that is provided must be at least 10 ft. A lot within 25 ft of a residence district boundary must keep a side yard of at least 10 ft and a rear yard of at least 30 ft (§ 230-35).

  • In the Municipal Place and Harmon gateway areas the Gateway Overlay caps floor area ratio at 0.35 for a single-use property and 0.40 for a multi-use one where that is more restrictive (§ 230-20.4).
  • That overlay also caps a single building at 20,000 square feet and a single commercial use at 8,000 square feet.
  • The code publishes no lot area, lot depth or front yard figure for this district, and no coverage cap.
  • Dwelling units may go above a street-level nonresidential use by Planning Board special permit, with that use held to the street level and 5,000 square feet, and two parking spaces per unit.

Riverside Commercial - No side or rear yard is required, but one that is provided must be at least 10 ft. A lot within 25 ft of a residence district boundary must keep a side yard of at least 10 ft and a rear yard of at least 30 ft (§ 230-35).

  • In the Harmon and South Riverside gateway area the Gateway Overlay caps floor area ratio at 0.35 for a single-use property and 0.40 for a multi-use one where that is more restrictive (§ 230-20.4).
  • That overlay also caps a single building at 20,000 square feet and a single commercial use at 8,000 square feet.
  • The code publishes no lot area, lot depth or front yard figure for this district, and no coverage cap.
  • Dwelling units may go above a street-level nonresidential use by Planning Board special permit, with that use held to the street level and 5,000 square feet, and two parking spaces per unit.

Riverside Transition - The 15 ft front yard is measured from the sidewalk. No side or rear yard is required, but one that is provided must be at least 10 ft.

  • A lot within 25 ft of a residence district boundary must keep a side yard of at least 10 ft and a rear yard of at least 30 ft (§ 230-35).
  • In the Harmon and South Riverside gateway area the Gateway Overlay caps floor area ratio at 0.35 for a single-use property and 0.40 for a multi-use one where that is more restrictive (§ 230-20.4).
  • That overlay also caps a single building at 20,000 square feet and a single commercial use at 8,000 square feet.
  • The code publishes no lot area or lot depth figure for this district, and no building coverage cap.
  • Dwelling units may go above a street-level nonresidential use by Planning Board special permit, with that use held to the street level and 5,000 square feet, and two parking spaces per unit.

General Commercial - No side or rear yard is required, but one that is provided must be at least 10 ft. A lot within 25 ft of a residence district boundary must keep a side yard of at least 10 ft and a rear yard of at least 30 ft (§ 230-35).

  • In the Municipal Place and Harmon gateway areas the Gateway Overlay caps floor area ratio at 0.35 for a single-use property and 0.40 for a multi-use one where that is more restrictive (§ 230-20.4).
  • That overlay also caps a single building at 20,000 square feet and a single commercial use at 8,000 square feet, except on lots in the Municipal Place gateway area fronting Municipal Place.
  • On those Municipal Place lots height rises to three stories and 35 feet.
  • A building housing an automobile sales agency must stand at least 30 feet from a residential district line at the side or rear (§ 230-17).
  • The code publishes no lot area or lot depth figure for this district, and no building coverage cap.
  • Dwelling units may go above a street-level nonresidential use by Planning Board special permit, with that use held to the street level and 5,000 square feet, and two parking spaces per unit.

Limited Office - The rear yard rises to 30 ft for a lot within 25 ft of a residence district boundary (§ 230-35).

  • Any use permitted in an RB district is also allowed here and follows the RB regulations, so a house on an O-1 lot takes the RB figures rather than the ones shown (§ 230-15A(1)).
  • A day-care center needs a lot of at least 25,000 square feet and a special permit from the Planning Board (§ 230-15A(3)).
  • The code publishes no lot area minimum and no building coverage cap for this district.
  • Parking may be waived by the Planning Board on certain named streets where an improved site cannot fit the required spaces.

Limited Office - Where the Village or the state owns unusable right-of-way land alongside the highway, the Board of Trustees may by special permit treat the edge of the highway or sidewalk as the street line for the front yard, but no building may stand less than 15 feet from the front line.

  • No parking or other paved area may be less than 25 feet from any street line, except for ingress and egress (§ 230-36B).
  • Height is published only in feet, with no story limit, and the code sets no building coverage cap.

Light Industrial - Only business and professional offices with related showrooms, railroad lines and stations, and parking structures and lots are allowed by right; light manufacturing and the other uses of § 230-18C need a special permit.

  • On that special permit the Planning Board may allow a lot of less than three acres, but not less than one acre (§ 230-18D).
  • Any yard within 25 feet of a residence district boundary is 50 feet, and a use on land fronting the Hudson River owes a 100 foot setback from the mean high-water line, separate from the yards.
  • Height is limited by both the story count and the foot figure, and additionally to half the distance to the nearest lot line.
  • Transit-oriented development of mixed-use or multifamily housing needs a special permit and only on lots fronting Croton Point Avenue west of Route 9 within 1,500 feet of the Croton-Harmon station.
  • It needs a lot of at least 10,000 square feet and takes five stories and a floor area ratio of 1.20, with studio, one-bedroom and two-bedroom units only and yards set by the Planning Board.
  • A lot of less than three acres whose boundaries were established before the chapter took effect is exempt from the lot area minimum but must still meet the waterfront setback (§ 230-18).

Park, Recreation and Education (educational buildings) - Land qualifies for the district only if it is owned by the Village, owned by another public body and dedicated to a district purpose, or privately held in trust or restricted by deed to such a purpose (§ 230-20B).

  • The code publishes only a height and three yards here, and no lot area, lot width, coverage or floor area ratio.
  • The designation covers public schools and other public educational buildings, zoos, aquariums, botanical gardens, theatres for the performing arts, band shells, museums, galleries and libraries.
  • Everything allowed in PRE-1 and PRE-2 is allowed here as well (§ 230-20C(3)).
  • A building existing when the district was established may continue.
  • A public utility installation needed to serve properties in the Village may be allowed by special permit from the Planning Board, and site plan approval is required (§ 230-20F).

Waterfront Commercial - A use on land fronting a watercourse owes a 25 foot setback from the mean high-water line, or, where the Planning Board judges the use needs to be close to the water, a strip elsewhere on the site adequate for pedestrian passage to the next adjoining lands.

  • That waterfront access figure is separate from the yards.
  • On site plan approval the Planning Board normally requires a dry-land right-of-way or easement at least 15 feet wide to be deeded to the Village for public access, which it may waive (§ 230-19F).
  • Height is limited by both the one story count and the 20 foot figure, and is measured from the curb level of the higher street where a lot fronts on two or more streets (§ 230-43A).
  • The code publishes no building coverage cap for this district.

Park, Recreation and Education (passive open space) - Land qualifies for the district only if it is owned by the Village, owned by another public body and dedicated to a district purpose, or privately held in trust or restricted by deed to such a purpose (§ 230-20B).

  • The code publishes only a height and three yards here, and no lot area, lot width, coverage or floor area ratio.
  • The designation covers natural open space, bird and wildlife sanctuaries, parks and passive use, woodland preserving vistas and view corridors, and paths, boardwalks or bridges for those uses.
  • A building existing when the district was established may continue.
  • A public utility installation needed to serve properties in the Village may be allowed by special permit from the Planning Board, and site plan approval is required (§ 230-20F).

Unzoned - This is not a zoning district. It covers land outside the mapped zoning districts, such as rights-of-way and water bodies, including the unzoned U.S. Route 9 corridor.

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Size limits on record in Croton-on-Hudson

Where the code states a size cap, it decides which row of the cost table above actually applies to you. These are the caps recorded for Croton-on-Hudson:

Costs an ADU adds that a house does not

Sizing up a specific parcel in Croton-on-Hudson?

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Building a full house instead?

A standard-finish house in Croton-on-Hudson runs $242–318/sq ft, about $435k–570k at 1,800 sq ft , plus roughly $9,471 for a conforming lot. See what it costs to build a house in Croton-on-Hudson.

ADU cost in nearby towns

Mount Vernon (City)
800 sq ft ≈ $235k–310k
New Rochelle (City)
800 sq ft ≈ $235k–310k
Peekskill (City)
800 sq ft ≈ $235k–310k
Rye (City)
800 sq ft ≈ $235k–310k
White Plains (City)
800 sq ft ≈ $235k–310k
Yonkers (City)
800 sq ft ≈ $235k–310k

All Westchester County towns: Mount Vernon (City) · New Rochelle (City) · Peekskill (City) · Rye (City) · White Plains (City) · Yonkers (City) · Bedford · Cortlandt · Eastchester · Greenburgh · Lewisboro · Mamaroneck · Mount Pleasant · New Castle · North Castle · North Salem · Ossining · Pound Ridge · Somers · Yorktown · Harrison (Village) · Ardsley (Village) · Briarcliff Manor (Village) · Bronxville (Village) · Buchanan (Village) · Dobbs Ferry (Village) · Elmsford (Village) · Hastings-on-Hudson (Village) · Irvington (Village) · Larchmont (Village) · Mamaroneck (Village) · Mount Kisco (Village) · Ossining (Village) · Pelham (Village) · Pelham Manor (Village) · Pleasantville (Village) · Port Chester (Village) · Rye Brook (Village) · Scarsdale (Village) · Sleepy Hollow (Village) · Tarrytown (Village) · Tuckahoe (Village)

More on Croton-on-Hudson: Can you build an ADU here? · Zoning for new construction · Westchester County build cost

ADU cost in Croton-on-Hudson: common questions

How much does it cost to build an ADU in Croton-on-Hudson, NY?

An 800 sq ft accessory dwelling unit in Village of Croton-on-Hudson runs roughly $235k–310k at a standard finish, general-contractor margin included. A 400 sq ft studio runs about $155k–205k. Those are structure costs on an easy site and do not include the septic, water or electrical service work a second unit often triggers.

Why does an ADU cost more per square foot than a house in Croton-on-Hudson?

Because a lot of a dwelling's cost is per dwelling, not per square foot. One kitchen, one bath group, one service panel and one heating plant cost about the same in an 800 sq ft cottage as in a 1,800 sq ft house, so on the smaller unit they get spread over less than half the floor area. That is why an ADU here prices at $296–388/sq ft against $242–318/sq ft for a full house, even though it is the same trades doing the same work.

Are ADUs allowed in Croton-on-Hudson?

Village of Croton-on-Hudson has 19 districts. 9 districts prohibit ADUs, 8 allow them with occupancy restrictions. 2 districts have incomplete data - verify with the building department at (914) 271-4783. Check the specific address with the free ADU checker before you spend money on design.

Can I rent an ADU in Croton-on-Hudson short term?

Short-term rentals allowed with registration for Village of Croton-on-Hudson. ADU rules and short-term-rental rules are set separately, so a unit you are allowed to build is not automatically one you are allowed to rent nightly. Confirm both before you underwrite the build on short-term-rental income.

ADU costs are modeled estimates in current 2026 dollars at the Westchester County regional index, general-contractor margin included, derived from Offsite's cost engine with a stated adjustment for the equipment a dwelling needs one of regardless of size. They are planning numbers for decision-support only - not a bid, quote, or guarantee, and not legal, architectural or engineering advice. They cover the structure and exclude septic expansion, utility service runs, site work beyond a flat and clear pad, and permit fees. ADU eligibility, size, owner-occupancy and permit conditions in the Village of Croton-on-Hudson vary by district and often carry exceptions this page does not show; zoning last reviewed 2026-09-26; verify with the building department at (914) 271-4783 before relying on any answer. Sources: the Offsite / Aldo cost engine and zoning dataset.

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