Cochecton · ADU cost
What it costs to build an ADU in Cochecton, NY
An 800 sq ft accessory dwelling unit in Cochecton runs roughly $190k–250k, or about $238–312/sq ft, and that per-square-foot figure sits deliberately above the $195–256/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 town 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 Town of Cochecton maps 6 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 Cochecton
Standard finish, slab on grade, on a flat and clear part of the lot, general-contractor margin included. These are structure costs at Sullivan County pricing, before the service and septic work a second dwelling can trigger.
| Size | Type | $ / sq ft | Estimated total |
|---|---|---|---|
| 400 sq ft | Studio | $316–$414 | $125k–165k |
| 600 sq ft | One bedroom | $264–$346 | $160k–210k |
| 800 sq ft | One bedroom, larger | $238–$312 | $190k–250k |
| 1,000 sq ft | Two bedroom | $223–$292 | $225k–290k |
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 | $7–$10 | $7 | — |
| Foundation | $16–$22 | $16 | — |
| Framing | $24–$30 | $24 | — |
| Envelope - roof, siding, windows | $30–$39 | $30 | — |
| Plumbing | $26–$32 | $16 | 55% |
| Electrical | $18–$23 | $12 | 35% |
| HVAC | $22–$27 | $14 | 45% |
| Insulation | $7–$9 | $7 | — |
| Interior finishes | $31–$41 | $26 | 15% |
| Millwork & cabinetry | $18–$26 | $10 | 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 Cochecton 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 |
|---|---|---|---|---|
| Agricultural Conservation District | 2 ac | 50 / 25 / 50 ft | 35 ft | No |
| Rural Development District | 2 ac | 50 / 25 / 50 ft | 35 ft | No |
| Hamlet District | 2 ac | 35 / 10 / 40 ft | 35 ft | No |
| Neighborhood Development District | 2 ac | 35 / 20 / 40 ft | 35 ft | No |
| Neighborhood Development - Residential Overlay District | 2 ac | 35 / 20 / 40 ft | 35 ft | No |
| Planned Unit Development | — | 40 / 30 / 30 ft | 35 ft | No |
Agricultural Conservation District - Minimum lot area is 2 acres on 150 feet of average lot width, with a 50 foot front yard, 25 foot side yards and a 50 foot rear yard, and a 35 foot height limit. Buildings may cover 20% of the lot, to a maximum of 200,000 square feet, and all surfaces together 40%.
- A conservation subdivision may shrink lots to 1 acre (43,560 square feet) on site sewer and water, or 0.5 acre (21,780 square feet) on central, with yards of 40 feet front and 30 feet side and rear.
- The minimum setback for an accessory use is 10 feet, and a conservation subdivision needs at least five lots and 10 acres.
- An intensive agricultural, forestry or livestock operation is a special permit use, needs 10 acres, and keeps nonresidential structures, pens and manure storage 200 feet from every lot line.
- A campground or RV park is a special permit use and needs a gross area of at least 10 contiguous acres in single ownership or under unified control.
- A manufactured home must be at least 12 feet wide with 850 square feet of living area, not counting living area added later.
- A yard bordering a lake, stream or body of water must be at least 100 feet deep, boathouses and docks excepted.
Rural Development District - Minimum lot area is 2 acres on 150 feet of average lot width, with a 50 foot front yard, 25 foot side yards and a 50 foot rear yard, and a 35 foot height limit. Buildings may cover 20% of the lot, to a maximum of 200,000 square feet, and all surfaces together 40%.
- A conservation subdivision may shrink lots to 1 acre (43,560 square feet) on site sewer and water, or 0.5 acre (21,780 square feet) on central, with yards of 40 feet front and 30 feet side and rear.
- A two family dwelling, or any two dwelling units on one property, requires the equivalent of two minimum sized lots in lot area.
- A summer camp or private school is a special permit use here and needs at least 25 acres, at least 50% of it free of 100-year floodplain, wetlands and slopes over 15%.
- It must keep buildings, parking, sewage treatment and recreation areas 200 feet from any public road and any adjoining property line, and give 10,000 square feet of lot area per building.
- A campground or RV park is a special permit use needing at least 10 contiguous acres, and a manufactured home must be at least 12 feet wide with 850 square feet of living area.
- A summer camp's buildings and sleeping quarters must stand 50 feet apart, and living quarters must give 125 square feet of floor area per occupant, up to ten persons each.
Hamlet District - Minimum lot area is 2 acres on 150 feet of average lot width, with a 35 foot front yard, 10 foot side yards and a 40 foot rear yard, and a 35 foot height limit. Buildings may cover 15% of the lot and all surfaces together 25%.
- With public utilities the minimum average lot width drops to 80 feet. The 2 acre minimum lot area does not change with utilities.
- A two family dwelling, or any two dwelling units on one property, requires the equivalent of two minimum sized lots in lot area.
- A conservation subdivision may shrink lots to 1 acre (43,560 square feet) on site sewer and water, or 0.5 acre (21,780 square feet) on central, with yards of 40 feet front and 30 feet side and rear.
- Where a commercial or manufacturing use adjoins an existing residence or an approved residential lot, the Planning Board may increase the front, side and rear yards by up to 50%.
- A manufactured home must be at least 12 feet wide with 850 square feet of living area, not counting living area added later.
- A yard bordering a lake, stream or body of water must be at least 100 feet deep, boathouses and docks excepted.
Neighborhood Development District - Minimum lot area is 2 acres on 150 feet of average lot width, with a 35 foot front yard, 20 foot side yards and a 40 foot rear yard, and a 35 foot height limit. Buildings may cover 30% of the lot and all surfaces together 50%.
- With public utilities the minimum lot area drops to 0.5 acre and the minimum average lot width to 100 feet. The yards, height and coverage caps do not change.
- A two family dwelling, or any two dwelling units on one property, requires the equivalent of two minimum sized lots in lot area.
- Multifamily dwellings are a special permit use, must have central sewage and water, and get a one hundred percent density bonus over what single family development of the same parcel would allow.
- A conservation subdivision may shrink lots to 1 acre (43,560 square feet) on site sewer and water, or 0.5 acre (21,780 square feet) on central, with yards of 40 feet front and 30 feet side and rear.
- Between Lake Huntington and County Road 113, Route 52, the front yard may be no more than 10 feet deep, which is a build to limit rather than a minimum.
- A manufactured home must be at least 12 feet wide with 850 square feet of living area, not counting living area added later.
Neighborhood Development - Residential Overlay District - This is an overlay on the ND district and takes its standards. Minimum lot area is 2 acres on 150 feet of average lot width, with a 35 foot front yard, 20 foot side yards, a 40 foot rear yard and a 35 foot height limit. Buildings may cover 30% and all surfaces 50%.
- None of the special uses allowed in the Neighborhood Development district are permitted here, so the overlay carries that district's dimensions but not its special uses.
- With public utilities the minimum lot area drops to 0.5 acre and the minimum average lot width to 100 feet. The yards, height and coverage caps do not change.
- A two family dwelling, or any two dwelling units on one property, requires the equivalent of two minimum sized lots in lot area.
- A conservation subdivision may shrink lots to 1 acre (43,560 square feet) on site sewer and water, or 0.5 acre (21,780 square feet) on central, with yards of 40 feet front and 30 feet side and rear.
- A manufactured home must be at least 12 feet wide with 850 square feet of living area, not counting living area added later.
- A yard bordering a lake, stream or body of water must be at least 100 feet deep, boathouses and docks excepted.
Planned Unit Development - The schedule publishes no minimum lot area or lot width here. The front yard is 40 feet, side and rear yards are 30 feet and height is capped at 35 feet. Buildings may cover 10% of the lot and all surfaces together 15%.
- Maximum density is one dwelling unit or equivalent per 100,000 square feet of land, and that density standard may not be waived or modified.
- A planned unit development should comprise at least 200 contiguous acres, although a smaller tract may be approved at the discretion of the Planning Board and Town Board.
- Every use here must be served by central water and central sewerage systems, with utility lines installed underground.
- Lot and yard requirements may be waived or modified, and the open space standards of a conservation subdivision apply, so at least half the land stays permanent open space.
- The only uses permitted outright are essential services and individual buildings or dwellings built under an already approved and filed plan. Everything else is a special permit use.
- A manufactured home must be at least 12 feet wide with 850 square feet of living area, not counting living area added later.
Size limits on record in Cochecton
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 Cochecton:
- Agricultural Conservation DistrictA PUD is created by application under § 240-33, and its lot standard is a density of one dwelling unit or equivalent per 100,000 square feet.
- Rural Development DistrictA PUD is created by application under § 240-33, and its lot standard is a density of one dwelling unit or equivalent per 100,000 square feet.
- Hamlet DistrictA PUD is created by application under § 240-33, and its lot standard is a density of one dwelling unit or equivalent per 100,000 square feet.
- Neighborhood Development DistrictA PUD is created by application under § 240-33, and its lot standard is a density of one dwelling unit or equivalent per 100,000 square feet.
- Neighborhood Development - Residential Overlay DistrictA PUD is created by application under § 240-33, and its lot standard is a density of one dwelling unit or equivalent per 100,000 square feet.
- Planned Unit DevelopmentA PUD is created by application under § 240-33, and its lot standard is a density of one dwelling unit or equivalent per 100,000 square feet.
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 NYSEG 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. As of June 2026 the town has no local short term rental law. That is not a confirmed approval of the use, so check with the building department before counting on short term rental income. Separate question from whether you can build the unit.
- Zoning codeecode360.com/CO3144
- Building dept(845) 932-8360
Sizing up a specific parcel in Cochecton?
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Building a full house instead?
A standard-finish house in Cochecton runs $195–256/sq ft, about $350k–460k at 1,800 sq ft , plus roughly $21,164 for a conforming lot. See what it costs to build a house in Cochecton.
ADU cost in nearby towns
All Sullivan County towns: Bethel · Callicoon · Delaware · Fallsburg · Forestburgh · Fremont · Highland · Liberty · Lumberland · Mamakating · Neversink · Rockland · Thompson · Tusten · Bloomingburg (Village) · Jeffersonville (Village) · Liberty (Village) · Monticello (Village) · Woodridge (Village)
More on Cochecton: Can you build an ADU here? · Zoning for new construction · Sullivan County build cost
ADU cost in Cochecton: common questions
How much does it cost to build an ADU in Cochecton, NY?
An 800 sq ft accessory dwelling unit in Town of Cochecton runs roughly $190k–250k at a standard finish, general-contractor margin included. A 400 sq ft studio runs about $125k–165k. 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 Cochecton?
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 $238–312/sq ft against $195–256/sq ft for a full house, even though it is the same trades doing the same work.
Are ADUs allowed in Cochecton?
Town of Cochecton has 6 districts. All districts prohibit ADUs. Check the specific address with the free ADU checker or confirm with the building department at (845) 932-8360 before you spend money on design.
Can I rent an ADU in Cochecton short term?
No local short-term-rental law on record - which is not the same as permission for Town of Cochecton. 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 Sullivan 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 Town of Cochecton vary by district and often carry exceptions this page does not show; zoning last reviewed 2026-10-07; verify with the building department at (845) 932-8360 before relying on any answer. Sources: the Offsite / Aldo cost engine and zoning dataset.