Tuckahoe · ADU cost
What it costs to build an ADU in Tuckahoe, NY
An 800 sq ft accessory dwelling unit in Tuckahoe 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 Tuckahoe maps 9 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 Tuckahoe
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.
| Size | Type | $ / sq ft | Estimated 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 ADU | If it scaled with floor area | Fixed 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 Tuckahoe 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 |
|---|---|---|---|---|
| Residence A-10 | 0.28 ac | 35 / 20 / 40 ft | 35 ft | No |
| Residence A-5 | 0.23 ac | 35 / 20 / 35 ft | 35 ft | No |
| Apartment 3 | 0.28 ac | 20 / 12 / 30 ft | 42 ft | No |
| Residence B | 0.23 ac | 35 / 15 / 35 ft | 35 ft | No |
| Business | — | 0 / 0 / 0 ft | 42 ft | No |
| Business/Residential | — | 0 / 0 / 0 ft | 42 ft | No |
| General Commercial | 0.11 ac | 10 / 10 / 20 ft | 50 ft | No |
| Industry | — | 20 / 20 / 20 ft | 50 ft | No |
| Unzoned | — | — | — | — |
Residence A-10 - The figures shown apply to a lot created after July 1, 1999. A lot that existed on or before that date keeps the older standards: 10,000 square feet of lot area, 80 ft of lot width, a 25 ft front yard, a 15 ft side yard and a 30 ft rear yard.
- On every lot the length of the street line must be at least 80% of the lot width (§ 4-1.3).
- On a corner lot both side yards must be at least 25 ft, though the Planning Board may adopt less restrictive side yard rules based on the build-to line along the street (§ 4-1.4.2).
- A place of worship or a school may reach 42 ft and three stories, but must stand 50 ft from any street line and 50 ft, or twice its height if that is greater, from any property line (§ 4-1.1.3).
- An accessory building may come no closer than 5 1/2 ft to a side or rear line and must stand at least 10 ft from the principal building.
- Cornices and cantilevered roofs may project 2 ft into a required yard, and paved terraces, steps and walks may come no closer than 15 ft to a street line or 4 ft to a property line (§ 4-1.4.4).
- Where a lot falls in two districts the more restrictive district governs, unless the Zoning Board of Appeals grants a special permit to average the area and bulk restrictions (§ 5-1.5).
Residence A-5 - The figures shown apply to a lot created after July 1, 1999. A lot that existed on or before that date keeps the older standards: 5,000 square feet of lot area, 50 ft of lot width, a 25 ft front yard, a 9 ft side yard and a 25 ft rear yard.
- The district's own sections set coverage at 40% and the floor area ratio at 0.5, and those govern over the 35% and 0.45 the bulk schedule prints (§ 4-2.5, § 4-2.6).
- On every lot the length of the street line must be at least 80% of the lot width (§ 4-2.3).
- On a corner lot both side yards must be at least 25 ft, though the Planning Board may adopt less restrictive side yard rules based on the build-to line along the street (§ 4-2.4.2).
- A place of worship or a school may reach 42 ft and three stories, but must stand 50 ft from any street line and 50 ft, or twice its height if that is greater, from any property line (§ 4-1.1.3).
- An accessory building may come no closer than 5 1/2 ft to a side or rear line and must stand at least 10 ft from the principal building.
- Where a lot falls in two districts the more restrictive district governs, unless the Zoning Board of Appeals grants a special permit to average the area and bulk restrictions (§ 5-1.5).
Apartment 3 - A side yard must meet the more restrictive of 12 ft or half the height of the wall facing the side lot line, so a taller building needs more.
- A townhouse, individual or clustered, instead needs a flat 15 ft side yard.
- Senior citizen housing takes a 15 ft rear yard and 40% principal building coverage (§ 4-4.4.3).
- Senior citizen housing must be designed for people 55 years of age or older (§ 4-4.6).
- An existing nonresidential building reused as apartments or as senior citizen housing may keep a height of up to 100 ft and six stories, as long as its height and bulk are not increased (§ 4-4.2.1).
- A place of worship or a school may reach 42 ft and three stories, but must stand 50 ft from any street line and 50 ft, or twice its height if that is greater, from any property line (§ 4-1.1.3).
- Accessory buildings may cover a further 10% of the lot, and the Zoning Board of Appeals may allow another 10% for garages where parking under the principal building is impractical.
Residence B - The figures shown apply to a lot created after July 1, 1999 and are the same for a one-family and a two-family house. A lot that existed on or before that date keeps the older standards, which split by use.
- Under the older standards a one-family house needs 5,000 square feet and 50 ft of width and a two-family house 7,500 square feet and 80 ft, both with a 25 ft front, 9 ft side and 25 ft rear yard.
- A landscaped buffer 5 ft wide is required inside the side and rear yards where they abut a property line, and it may hold no impervious surface for parking or driveways (§ 4-3.4.6).
- On every lot the length of the street line must be at least 80% of the lot width (§ 4-3.3).
- The district's own section sets coverage at 40%, and that governs over the 35% the bulk schedule prints (§ 4-3.5).
- A place of worship or a school may reach 42 ft and three stories, but must stand 50 ft from any street line and 50 ft, or twice its height if that is greater, from any property line (§ 4-1.1.3).
- An accessory building may come no closer than 5 1/2 ft to a side or rear line, must stand at least 10 ft from the principal building, and may hold no living quarters (§ 4-3.1.3).
Business - No front, side or rear yard is required, but a side or rear yard that is provided must be at least 6 ft.
- Height is capped at 3 stories plus a basement, and at 42 ft above curb level.
Business/Residential - No front, side or rear yard is required, but any side or rear yard that is provided must be at least 6 ft, and a yard of at least 10 ft is required along any lot line that borders a residential district.
- Residential units come only at or above the second story, by special permit, with their own entrance from the street, and may not share a story with a business use.
- Where the uses wholly within the district are at least half residential by gross floor area, the floor area ratio rises to 1.2 (§ 4-5.3.4).
- No vehicle may be parked or stored in that 10 ft yard unless a buffer of trees or plants approved by the Planning Board is provided (§ 4-5.3.2).
- A building constructed or occupied only for business use follows the Business District's use and yard requirements instead (§ 4-5.2).
- The 42 ft height is measured above the average grade of the street line at the front of the property (§ 4-5.3.3).
- A screen of shrubbery at least 5 ft wide and 3 ft high at planting, half of it evergreen, is required in a rear or side yard that adjoins property zoned for residence purposes (§ 5-1.4).
General Commercial - Side and rear yards rise to 50 ft wherever the site is within 50 ft of a residential district boundary.
- The front yard is measured from the curbline, sidewalk included, and grows by an additional 10 ft for any building over 40 ft tall.
- Neither the side nor the rear yard rule applies to a site fully separated from other districts by a street, river or rail line.
Industry - Buildings must sit an average of at least 20 ft, and never closer than 10 ft, from every site boundary, and at least 100 ft from a residential district boundary (§ 4-7.5(d)).
- The Planning Board may reduce the 100 ft to 50 ft on an environmental or character finding.
- Neither figure applies to a site fully separated from other districts by a street, river or main rail line.
Unzoned - This is not one of the village's zoning districts. It covers parcels outside the mapped districts.
Costs an ADU adds that a house does not
- Septic and water A second dwelling adds bedrooms to the design flow, which on an unsewered parcel often means expanding or replacing the existing system rather than tapping it. This is the single most common reason an ADU budget moves after design, and it is site-specific enough that no model should quote it - get it evaluated early.
- Utility service Con Edison territory. A detached unit needs power run to it, and whether it goes on its own meter or subfeeds the main house changes both the cost and the permit path.
- Access and parking Many codes require an added parking space for the accessory unit, and a detached unit usually needs a driveway extension or a path, both of which count against a lot-coverage or impervious-surface cap.
- Short-term rentalsNo local short-term-rental law on record - which is not the same as permission. The Village of Tuckahoe 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. Separate question from whether you can build the unit.
- Zoning codeecode360.com/TU1441
- Building dept(914) 961-8148
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Building a full house instead?
A standard-finish house in Tuckahoe runs $242–318/sq ft, about $435k–570k at 1,800 sq ft , plus roughly $2,296 for a conforming lot. See what it costs to build a house in Tuckahoe.
ADU cost in nearby towns
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More on Tuckahoe: Can you build an ADU here? · Zoning for new construction · Westchester County build cost
ADU cost in Tuckahoe: common questions
How much does it cost to build an ADU in Tuckahoe, NY?
An 800 sq ft accessory dwelling unit in Village of Tuckahoe 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 Tuckahoe?
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 Tuckahoe?
Village of Tuckahoe has 9 districts. 8 of 9 districts prohibit ADUs. 1 district has incomplete data - verify with the building department at (914) 961-8148. Check the specific address with the free ADU checker before you spend money on design.
Can I rent an ADU in Tuckahoe short term?
No local short-term-rental law on record - which is not the same as permission for Village of Tuckahoe. 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 Tuckahoe vary by district and often carry exceptions this page does not show; zoning last reviewed 2026-09-28; verify with the building department at (914) 961-8148 before relying on any answer. Sources: the Offsite / Aldo cost engine and zoning dataset.