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Dobbs Ferry · ADU cost

What it costs to build an ADU in Dobbs Ferry, NY

800 sq ft ≈ $235k–310k $296–388/sq ft 22 districts Con Edison

An 800 sq ft accessory dwelling unit in Dobbs Ferry 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 Dobbs Ferry maps 22 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 Dobbs Ferry

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 Dobbs Ferry 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 Residential 1 0.92 ac 40 / 20 / 40 ft 35 ft Occupancy restricted
One-Family Residential 2 0.46 ac 30 / 20 / 25 ft 35 ft Occupancy restricted
Multifamily 1 0.46 ac 25 / 25 / 30 ft 40 ft No
One-Family Residential 3 0.34 ac 30 / 15 / 25 ft 35 ft Occupancy restricted
One-Family Residential 4 0.23 ac 25 / 12 / 25 ft 35 ft Occupancy restricted
One-Family Residential 5 0.17 ac 25 / 10 / 25 ft 35 ft Occupancy restricted
Multifamily 2 0.46 ac 25 / 25 / 30 ft 40 ft No
One-Family Residential 6 0.11 ac 20 / 10 / 25 ft 35 ft Occupancy restricted
Mixed Density Residential 1 0.11 ac 20 / 10 / 25 ft 35 ft Occupancy restricted
Mixed Density Residential - Historic 0.23 ac 20 / 10 / 25 ft — Occupancy restricted
Multifamily 3 0.46 ac 50 / 25 / 30 ft 40 ft No
Multifamily 4 0.46 ac 10 / 10 / 30 ft 42 ft No
Broadway 0.11 ac - / 10 / 25 ft 45 ft No
Mixed Density Residential 2 0.11 ac 15 / 10 / 25 ft 42 ft Occupancy restricted
Downtown Business — 0 / 0 / 0 ft 40 ft No
Downtown Gateway — 0 / 5 / 0 ft 40 ft No
Downtown Transition — 0 / 5 / 25 ft 35 ft No
Educational/Institutional — 25 / 10 / 25 ft 50 ft No
Waterfront District A — 150 / - / - ft 30 ft No
Waterfront District B — 15 / 10 / 25 ft 35 ft No
Chauncey Park — 0 / 10 / 20 ft 65 ft No
Open Space — — — —

One-Family Residential 1, One-Family Residential 2, One-Family Residential 3 - The minimum lot area is measured net, after the deductions in § 300-34A(2).

  • Net lot area is the gross area less half of any area with slopes of 25 percent or more and a quarter of any area sloping over 15 percent but under 25 percent (§ 300-34A(2)).
  • The minimum lot area is the greater of the figure shown and the average lot area of the existing lots within 400 feet of the property, leaving out land in the OS-3 District (§ 300-35D(1)).
  • On a lot of 7,500 square feet or more the building and impervious caps are multiplied by 0.82 up to 10,000 square feet, 0.75 up to 20,000, 0.67 up to 40,000 and 0.56 at 40,000 or more.
  • Lot width and depth, the side yards and the front and rear yards are each the greater of the figure shown and a sliding scale, running on lot width for the sides and on lot depth for front and rear.
  • The front yard is the lesser of the prevailing setback of the block face plus or minus 10 percent and the figure shown, and no building need stand more than 50 feet back from a street line.
  • Height runs on roof pitch: 30 feet at a pitch of 0.25 or less, 33 feet above 0.25 up to 0.30, 35 feet above 0.30, and 28 feet to the eave, measured from the grade plane to the ridge.

Multifamily 1 - Each dwelling unit needs at least 6,000 sq ft of net lot area.

  • No lot may be subdivided unless every resulting lot meets that figure (§ 300-35D(2)).
  • Net lot area is the gross area less half of any area with slopes of 25 percent or more and a quarter of any area sloping over 15 percent but under 25 percent (§ 300-34A(2)).
  • The minimum lot area is the greater of the figure shown and the average lot area of the existing lots within 400 feet of the property, leaving out land in the OS-3 District (§ 300-35D(1)).
  • On a lot of 7,500 square feet or more the building and impervious caps are multiplied by 0.82 up to 10,000 square feet, 0.75 up to 20,000, 0.67 up to 40,000 and 0.56 at 40,000 or more.
  • Lot width and depth, the side yards and the front and rear yards are each the greater of the figure shown and a sliding scale, running on lot width for the sides and on lot depth for front and rear.
  • Height runs on roof pitch: 30 feet at a pitch of 0.25 or less, 35 feet above 0.25 up to 0.30, 40 feet above 0.30, and 28 feet to the eave.

One-Family Residential 4, One-Family Residential 5, One-Family Residential 6 - The front yard is also capped at the prevailing setback, so it has a maximum as well as a minimum.

  • The minimum lot area is measured net, after the deductions in § 300-34A(2).
  • Net lot area is the gross area less half of any area with slopes of 25 percent or more and a quarter of any area sloping over 15 percent but under 25 percent (§ 300-34A(2)).
  • The minimum lot area is the greater of the figure shown and the average lot area of the existing lots within 400 feet of the property, leaving out land in the OS-3 District (§ 300-35D(1)).
  • On a lot of 7,500 square feet or more the building and impervious caps are multiplied by 0.82 up to 10,000 square feet, 0.75 up to 20,000, 0.67 up to 40,000 and 0.56 at 40,000 or more.
  • Lot width and depth, the side yards and the front and rear yards are each the greater of the figure shown and a sliding scale, running on lot width for the sides and on lot depth for front and rear.
  • Height runs on roof pitch: 30 feet at a pitch of 0.25 or less, 33 feet above 0.25 up to 0.30, 35 feet above 0.30, and 28 feet to the eave, measured from the grade plane to the ridge.

Multifamily 2 - Each dwelling unit needs at least 3,500 sq ft of net lot area.

  • No lot may be subdivided unless every resulting lot meets that figure (§ 300-35D(2)).
  • Net lot area is the gross area less half of any area with slopes of 25 percent or more and a quarter of any area sloping over 15 percent but under 25 percent (§ 300-34A(2)).
  • The minimum lot area is the greater of the figure shown and the average lot area of the existing lots within 400 feet of the property, leaving out land in the OS-3 District (§ 300-35D(1)).
  • On a lot of 7,500 square feet or more the building and impervious caps are multiplied by 0.82 up to 10,000 square feet, 0.75 up to 20,000, 0.67 up to 40,000 and 0.56 at 40,000 or more.
  • Lot width and depth, the side yards and the front and rear yards are each the greater of the figure shown and a sliding scale, running on lot width for the sides and on lot depth for front and rear.
  • Height runs on roof pitch: 30 feet at a pitch of 0.25 or less, 35 feet above 0.25 up to 0.30, 40 feet above 0.30, and 28 feet to the eave.

Mixed Density Residential 1 - Each dwelling unit needs at least 2,500 sq ft of net lot area.

  • No lot may be subdivided unless every resulting lot meets that figure (§ 300-35D(2)).
  • Net lot area is the gross area less half of any area with slopes of 25 percent or more and a quarter of any area sloping over 15 percent but under 25 percent (§ 300-34A(2)).
  • The minimum lot area is the greater of the figure shown and the average lot area of the existing lots within 400 feet of the property, leaving out land in the OS-3 District (§ 300-35D(1)).
  • On a lot of 7,500 square feet or more the building and impervious caps are multiplied by 0.82 up to 10,000 square feet, 0.75 up to 20,000, 0.67 up to 40,000 and 0.56 at 40,000 or more.
  • Lot width and depth, the side yards and the front and rear yards are each the greater of the figure shown and a sliding scale, running on lot width for the sides and on lot depth for front and rear.
  • Height runs on roof pitch: 30 feet at a pitch of 0.25 or less, 33 feet above 0.25 up to 0.30, 35 feet above 0.30, and 28 feet to the eave, measured from the grade plane to the ridge.

Mixed Density Residential - Historic - Each dwelling unit needs at least 2,500 sq ft of net lot area.

  • The code states no height in feet here, only the three-story limit.
  • No lot may be subdivided unless every resulting lot meets that figure (§ 300-35D(2)).
  • Net lot area is the gross area less half of any area with slopes of 25 percent or more and a quarter of any area sloping over 15 percent but under 25 percent (§ 300-34A(2)).
  • The minimum lot area is the greater of the figure shown and the average lot area of the existing lots within 400 feet of the property, leaving out land in the OS-3 District (§ 300-35D(1)).
  • On a lot of 7,500 square feet or more the building and impervious caps are multiplied by 0.82 up to 10,000 square feet, 0.75 up to 20,000, 0.67 up to 40,000 and 0.56 at 40,000 or more.
  • Lot width and depth, the side yards and the front and rear yards are each the greater of the figure shown and a sliding scale, running on lot width for the sides and on lot depth for front and rear.

Multifamily 3 - Each dwelling unit needs at least 2,500 sq ft of net lot area.

  • The 40 foot height is set at a roof pitch of 0.25 or less, and no figure is stated for the steeper pitch bands.
  • No lot may be subdivided unless every resulting lot meets that figure (§ 300-35D(2)).
  • Net lot area is the gross area less half of any area with slopes of 25 percent or more and a quarter of any area sloping over 15 percent but under 25 percent (§ 300-34A(2)).
  • The minimum lot area is the greater of the figure shown and the average lot area of the existing lots within 400 feet of the property, leaving out land in the OS-3 District (§ 300-35D(1)).
  • On a lot of 7,500 square feet or more the building and impervious caps are multiplied by 0.82 up to 10,000 square feet, 0.75 up to 20,000, 0.67 up to 40,000 and 0.56 at 40,000 or more.
  • Lot width and depth, the side yards and the front and rear yards are each the greater of the figure shown and a sliding scale, running on lot width for the sides and on lot depth for front and rear.

Multifamily 4 - Each dwelling unit needs at least 1,750 sq ft of net lot area.

  • Height runs on roof pitch: 35 feet at a pitch of 0.25 or less, 40 feet above 0.25 up to 0.30 and 42 feet above 0.30.
  • No lot may be subdivided unless every resulting lot meets that figure (§ 300-35D(2)).
  • Net lot area is the gross area less half of any area with slopes of 25 percent or more and a quarter of any area sloping over 15 percent but under 25 percent (§ 300-34A(2)).
  • The minimum lot area is the greater of the figure shown and the average lot area of the existing lots within 400 feet of the property, leaving out land in the OS-3 District (§ 300-35D(1)).
  • On a lot of 7,500 square feet or more the building and impervious caps are multiplied by 0.82 up to 10,000 square feet, 0.75 up to 20,000, 0.67 up to 40,000 and 0.56 at 40,000 or more.
  • Lot width and depth, the side yards and the front and rear yards are each the greater of the figure shown and a sliding scale, running on lot width for the sides and on lot depth for front and rear.

Broadway - The front yard is the prevailing setback, the setback of the neighbouring buildings, rather than a fixed figure.

  • Each dwelling unit needs at least 800 sq ft of net lot area.
  • Height runs on roof pitch, measured from the curb: 40 feet at a pitch of 0.25 or less, 43 feet above 0.25 up to 0.30 and 45 feet above 0.30.
  • Net lot area is the gross area less half of any area with slopes of 25 percent or more and a quarter of any area sloping over 15 percent but under 25 percent (§ 300-34A(2)).
  • The minimum lot area is the greater of the figure shown and the average lot area of the existing lots within 400 feet of the property, leaving out land in the OS-3 District (§ 300-35D(1)).
  • On a lot of 7,500 square feet or more the building and impervious caps are multiplied by 0.82 up to 10,000 square feet, 0.75 up to 20,000, 0.67 up to 40,000 and 0.56 at 40,000 or more.
  • Lot width and depth, the side yards and the front and rear yards are each the greater of the figure shown and a sliding scale, running on lot width for the sides and on lot depth for front and rear.

Mixed Density Residential 2 - A third story must be set back 5 ft from the front of the building at ground level, measured within the first 40 ft of building width on a building wider than 40 ft.

  • Each dwelling unit needs at least 800 sq ft of net lot area.
  • On a building wider than 40 feet measured parallel to Palisade Street, the width beyond 40 feet takes another five feet of front yard (§ 300-35D(5)(c)).
  • Net lot area is the gross area less half of any area with slopes of 25 percent or more and a quarter of any area sloping over 15 percent but under 25 percent (§ 300-34A(2)).
  • The minimum lot area is the greater of the figure shown and the average lot area of the existing lots within 400 feet of the property, leaving out land in the OS-3 District (§ 300-35D(1)).
  • On a lot of 7,500 square feet or more the building and impervious caps are multiplied by 0.82 up to 10,000 square feet, 0.75 up to 20,000, 0.67 up to 40,000 and 0.56 at 40,000 or more.
  • Lot width and depth, the side yards and the front and rear yards are each the greater of the figure shown and a sliding scale, running on lot width for the sides and on lot depth for front and rear.

Downtown Business - A structure next to a residentially zoned property or the Old Croton Aqueduct must be set back at least 10 ft from that shared line, whatever the district minimum.

  • The front yard also has a maximum, the prevailing setback.
  • The side yard also has a maximum of 0 ft, which the Board of Trustees may waive to preserve light and air access or an existing driveway.
  • The code sets no minimum lot area here and leaves the number of units to the developer, subject to the approval of the Board of Trustees.
  • Residential use is prohibited along the whole ground floor of the principal building facing a public street, and that nonresidential space must be at least 25 feet deep (§ 300-36C(2)).
  • A fourth story and height up to 45 feet may be granted only by the Board of Trustees through site plan review on a finding of public benefit, and its living area may not exceed half the story below.
  • The district also sets a minimum of two stories and 24 feet.

Downtown Gateway - A structure next to a residentially zoned property or the Old Croton Aqueduct must be set back at least 10 ft from that shared line, whatever the district minimum.

  • The code sets no minimum lot area here and leaves the number of units to the developer, subject to the approval of the Board of Trustees.
  • Residential use is prohibited along the whole ground floor of the principal building facing a public street, and that nonresidential space must be at least 25 feet deep (§ 300-36C(2)).
  • No maximum front yard is set for this district.
  • No rear yard is required for a through lot in a downtown district where a court on a side lot line of at least the area of the required rear yard is provided instead (§ 300-34B(6)(b)).
  • The district also sets a minimum of two stories and 24 feet.
  • A fourth story and height up to 45 feet may be granted only by the Board of Trustees through site plan review on a finding of public benefit, and its living area may not exceed half the story below.

Downtown Transition - A structure next to a residentially zoned property or the Old Croton Aqueduct must be set back at least 10 ft from that shared line, whatever the district minimum.

  • The front yard also has a maximum, the prevailing setback.
  • The code sets no minimum lot area here and leaves the number of units to the developer, subject to the approval of the Board of Trustees.
  • No rear yard is required for a through lot in a downtown district where a court on a side lot line of at least the area of the required rear yard is provided instead (§ 300-34B(6)(b)).
  • The district also sets a minimum of two stories and 24 feet.
  • A fourth story and height up to 40 feet may be granted only by the Board of Trustees through site plan review on a finding of public benefit, and its living area may not exceed half the story below.
  • Cluster development is not permitted in the downtown districts.

Educational/Institutional - Residential use here requires rezoning to the underlying OF1 district, on Planning Board recommendation and Village Board of Trustees approval. Once converted, each dwelling unit needs at least 40,000 sq ft of lot.

  • Coverage is calculated on net lot area, after open-space deductions.
  • Density may be increased under the cluster development standards and the findings of site plan review (§ 300-37D(6)).
  • The code publishes no minimum lot size for the district.
  • Any redevelopment that subdivides property or puts up new structures must meet the cluster development standards of § 300-54F, and must carry a long-term plan for the site (§ 300-37D(2)).
  • A 100,000 square foot lot with 60,000 square feet of open space may cover 20,000 square feet in buildings and 32,000 square feet in all.
  • The footprint of an open parking deck counts against the impervious cap rather than the building cap.

Waterfront District A - The 150 ft front setback is measured from the mean high-water line of the Hudson River, and a variance can reduce it to no less than 100 ft.

  • Side and rear yards are set at the Planning Board's discretion.
  • No building may be longer than 150 ft in any one direction.
  • The district permits no dwellings, and every use needs a special permit and site plan review.
  • The exceptions to that permit requirement are restaurants, sales-oriented retail, artists and craftspersons studios and named educational enterprises in structures that existed on 23 September 2003.
  • No part of a lot lying below the mean high water mark may be counted in working out yield, density, bulk, lot coverage or site coverage (§ 300-37A(5)).
  • The setback does not bar a public walkway or esplanade, a seasonal kiosk or concession stand, a pier, dock, benches, picnic facilities, open recreational space or a footbridge.

Waterfront District B - Before bulk or density is worked out, an area equal to 140 percent of the footprint of any existing building or structure that is to remain is subtracted from the lot area, § 300-37B(3).

  • Height is 45 ft or four stories, but no building may exceed 35 ft in height from the curbline on Palisade Street.
  • Each dwelling unit needs at least 2,500 sq ft of gross lot area.
  • The building and impervious caps are figured on gross lot area, not on the net area after open space deductions.
  • The front, side and rear yards follow the MDR2 district's standards rather than figures of their own.

Chauncey Park - Each dwelling unit needs at least 1,800 sq ft of gross site area, and the Board of Trustees may raise the density by up to 20 percent in exchange for benefits such as open space, trails or traffic and transit improvements, § 300-37C.

  • New construction must meet the cluster development standards of § 300-54F.
  • Where clustering is proposed no front or side yard is required, but any front or side yard that is provided must be at least 10 ft.
  • A yard of at least 10 ft must be left along any lot line bordering a residential district.
  • The building and impervious caps are figured on gross lot area, not on the net area after open space deductions.

Open Space - The code establishes three open space districts, OS-1 Dedicated, OS-2 Reserved and OS-3 Reserved, § 300-30.

  • Land in the OS-3 District is left out of the average lot area that sets a minimum lot area in the residential districts, § 300-35D(1).
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Size limits on record in Dobbs Ferry

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 Dobbs Ferry:

Costs an ADU adds that a house does not

Sizing up a specific parcel in Dobbs Ferry?

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Building a full house instead?

A standard-finish house in Dobbs Ferry runs $242–318/sq ft, about $435k–570k at 1,800 sq ft . See what it costs to build a house in Dobbs Ferry.

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

ADU cost in Dobbs Ferry: common questions

How much does it cost to build an ADU in Dobbs Ferry, NY?

An 800 sq ft accessory dwelling unit in Village of Dobbs Ferry 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 Dobbs Ferry?

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 Dobbs Ferry?

Village of Dobbs Ferry has 22 districts. 12 districts prohibit ADUs, 9 allow them with occupancy restrictions. 1 district has incomplete data - verify with the building department at (914) 231-8513. Check the specific address with the free ADU checker before you spend money on design.

Can I rent an ADU in Dobbs Ferry short term?

No local short-term-rental law on record - which is not the same as permission for Village of Dobbs Ferry. 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 Dobbs Ferry 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) 231-8513 before relying on any answer. Sources: the Offsite / Aldo cost engine and zoning dataset.

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