Claverack · ADU cost
What it costs to build an ADU in Claverack, NY
An 800 sq ft accessory dwelling unit in Claverack runs roughly $195k–260k, or about $247–323/sq ft, and that per-square-foot figure sits deliberately above the $202–265/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 Claverack 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 Claverack
Standard finish, slab on grade, on a flat and clear part of the lot, general-contractor margin included. These are structure costs at Columbia County pricing, before the service and septic work a second dwelling can trigger.
| Size | Type | $ / sq ft | Estimated total |
|---|---|---|---|
| 400 sq ft | Studio | $327–$428 | $130k–170k |
| 600 sq ft | One bedroom | $273–$358 | $165k–215k |
| 800 sq ft | One bedroom, larger | $247–$323 | $195k–260k |
| 1,000 sq ft | Two bedroom | $231–$302 | $230k–300k |
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–$11 | $7 | — |
| Foundation | $16–$23 | $16 | — |
| Framing | $25–$32 | $25 | — |
| Envelope - roof, siding, windows | $32–$41 | $32 | — |
| Plumbing | $27–$33 | $16 | 55% |
| Electrical | $18–$23 | $13 | 35% |
| HVAC | $23–$28 | $14 | 45% |
| Insulation | $7–$9 | $7 | — |
| Interior finishes | $32–$43 | $27 | 15% |
| Millwork & cabinetry | $18–$27 | $11 | 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 Claverack 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 |
|---|---|---|---|---|
| Rural Conservation | 5 ac | 80 / 50 / 50 ft | 35 ft | Special permit |
| Rural Residential | 2 ac | 50 / 20 / 40 ft | 35 ft | Special permit |
| Rural Agricultural | 5 ac | 50 / 20 / 40 ft | 35 ft | Special permit |
| Hamlet Residential | 1 ac | 30 / 10 / 30 ft | 35 ft | Special permit |
| Mobile Home Park | 12 ac | 300 / 15 / 50 ft | 20 ft | No |
| Highway Commercial | 1 ac | 70 / 20 / 50 ft | 35 ft | Special permit |
| Hamlet Business | 0.5 ac | 30 / 10 / 30 ft | 35 ft | Special permit |
| Hamlet Business 1 | 1 ac | 30 / 20 / 50 ft | 35 ft | Special permit |
| Commercial Industrial Park | 1 ac | 40 / 25 / 20 ft | 35 ft | No |
Rural Conservation - The 5 acres shown is a density of one dwelling per five acres, not a lot minimum. A lot may be as small as Columbia County water and waste treatment standards allow, if the parcel as a whole stays within that density (§ 6.3.1).
- The density is the parcel's total development potential: once it is used up through subdivision, no further subdivision is allowed (§ 6.3.2).
- A residential subdivision, special exception or site plan may earn up to 30% more dwelling units than the table allows (§ 6.4).
- That bonus is earned by preserving 50% or more of a parcel as agricultural land, by moderately-priced housing or by traditional neighbourhood design.
- On a corner lot, the side yard abutting the side street is 80 ft.
- Minimum lot frontage is 200 ft, a separate requirement from the lot width.
- Building footprint is set at 3,500 sq ft for a commercial or manufacturing building, 5,000 sq ft for a multifamily structure of 3 or more units and 10,000 sq ft for an institutional structure.
Rural Residential - The 2 acres shown is a density of one dwelling per two acres, not a lot minimum. A lot may be as small as Columbia County water and waste treatment standards allow, if the parcel as a whole stays within that density (§ 6.3.1).
- The density is the parcel's total development potential: once it is used up through subdivision, no further subdivision is allowed (§ 6.3.2).
- A residential subdivision, special exception or site plan may earn up to 30% more dwelling units than the table allows (§ 6.4).
- That bonus is earned by preserving 50% or more of a parcel as agricultural land, by moderately-priced housing or by traditional neighbourhood design.
- On a corner lot, the side yard abutting the side street is 25 ft.
- Minimum lot frontage is 150 ft, a separate requirement from the lot width.
- Building footprint is set at 3,500 sq ft for a commercial or manufacturing building and 10,000 sq ft for an institutional structure.
Rural Agricultural - The 5 acres shown is a density of one dwelling per five acres, not a lot minimum. A lot may be as small as Columbia County water and waste treatment standards allow, if the parcel as a whole stays within that density (§ 6.3.1).
- The density is the parcel's total development potential: once it is used up through subdivision, no further subdivision is allowed (§ 6.3.2).
- A residential subdivision, special exception or site plan may earn up to 30% more dwelling units than the table allows (§ 6.4).
- That bonus is earned by preserving 50% or more of a parcel as agricultural land, by moderately-priced housing or by traditional neighbourhood design.
- On a corner lot, the side yard abutting the side street is 25 ft.
- Minimum lot frontage is 150 ft, a separate requirement from the lot width.
- Building footprint is set at 3,500 sq ft for a commercial or manufacturing building and 10,000 sq ft for an institutional structure.
Hamlet Residential - With public sewage or water, the minimum lot size drops to 0.5 acre.
- On a corner lot, the side yard abutting the side street is 20 ft.
- Minimum lot frontage is 80 ft, a separate requirement from the lot width.
- The density is the parcel's total development potential: once it is used up through subdivision, no further subdivision is allowed (§ 6.3.2).
- A residential subdivision, special exception or site plan may earn up to 30% more dwelling units than the table allows (§ 6.4).
- That bonus is earned by preserving 50% or more of a parcel as agricultural land, by moderately-priced housing or by traditional neighbourhood design.
- Building footprint is set at 5,000 sq ft for a multifamily structure of 3 or more units and 10,000 sq ft for an institutional structure.
Mobile Home Park - Minimum lot frontage is 300 ft, a separate requirement from the lot width shown.
- On a corner lot, the side yard abutting the side street is 25 ft.
- The density is the parcel's total development potential: once it is used up through subdivision, no further subdivision is allowed (§ 6.3.2).
- A residential subdivision, special exception or site plan may earn up to 30% more dwelling units than the table allows (§ 6.4).
- That bonus is earned by preserving 50% or more of a parcel as agricultural land, by moderately-priced housing or by traditional neighbourhood design.
- Building footprint is set at 10,000 sq ft for an institutional structure.
Highway Commercial - Building footprint is set at 20,000 sq ft for retail and 45,000 sq ft for non-retail, 2,500 sq ft for a multifamily structure of 3 or more units, and 10,000 sq ft for an institutional structure.
- On a corner lot, the side yard abutting the side street is 70 ft.
- Minimum lot frontage is 100 ft, a separate requirement from the lot width.
- The density is the parcel's total development potential: once it is used up through subdivision, no further subdivision is allowed (§ 6.3.2).
- A residential subdivision, special exception or site plan may earn up to 30% more dwelling units than the table allows (§ 6.4).
- That bonus is earned by preserving 50% or more of a parcel as agricultural land, by moderately-priced housing or by traditional neighbourhood design.
Hamlet Business - On a corner lot, the side yard abutting the side street is 20 ft, and minimum lot frontage is 80 ft, a separate requirement from the lot width.
- Building footprint is set at 6,000 sq ft for a commercial or manufacturing building, 5,000 sq ft for a multifamily structure of 3 or more units and 10,000 sq ft for an institutional structure.
- The density is the parcel's total development potential: once it is used up through subdivision, no further subdivision is allowed (§ 6.3.2).
- A residential subdivision, special exception or site plan may earn up to 30% more dwelling units than the table allows (§ 6.4).
- That bonus is earned by preserving 50% or more of a parcel as agricultural land, by moderately-priced housing or by traditional neighbourhood design.
Hamlet Business 1 - On a corner lot, the side yard abutting the side street is 40 ft, and minimum lot frontage is 100 ft, a separate requirement from the lot width.
- Building footprint is set at 6,000 sq ft for a commercial or manufacturing building, 5,000 sq ft for a multifamily structure of 3 or more units and 10,000 sq ft for an institutional structure.
- The density is the parcel's total development potential: once it is used up through subdivision, no further subdivision is allowed (§ 6.3.2).
- A residential subdivision, special exception or site plan may earn up to 30% more dwelling units than the table allows (§ 6.4).
- That bonus is earned by preserving 50% or more of a parcel as agricultural land, by moderately-priced housing or by traditional neighbourhood design.
Commercial Industrial Park - Building footprint is set at 100,000 sq ft for a commercial or manufacturing building and 10,000 sq ft for an institutional structure.
- On a corner lot, the side yard abutting the side street is 40 ft.
- Minimum lot frontage is 150 ft, a separate requirement from the lot width.
- The density is the parcel's total development potential: once it is used up through subdivision, no further subdivision is allowed (§ 6.3.2).
- A residential subdivision, special exception or site plan may earn up to 30% more dwelling units than the table allows (§ 6.4).
- That bonus is earned by preserving 50% or more of a parcel as agricultural land, by moderately-priced housing or by traditional neighbourhood design.
Size limits on record in Claverack
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 Claverack:
- Rural ConservationIn RC, RR and RA a detached caretaker or owner dwelling of up to 1,600 sq ft is also possible by special exception on a lot with the density for two dwellings. Building department: (518) 672-4471.
- Rural ResidentialIn RC, RR and RA a detached caretaker or owner dwelling of up to 1,600 sq ft is also possible by special exception on a lot with the density for two dwellings. Building department: (518) 672-4471.
- Rural AgriculturalIn RC, RR and RA a detached caretaker or owner dwelling of up to 1,600 sq ft is also possible by special exception on a lot with the density for two dwellings. Building department: (518) 672-4471.
- Hamlet ResidentialIn RC, RR and RA a detached caretaker or owner dwelling of up to 1,600 sq ft is also possible by special exception on a lot with the density for two dwellings. Building department: (518) 672-4471.
- Mobile Home ParkIn RC, RR and RA a detached caretaker or owner dwelling of up to 1,600 sq ft is also possible by special exception on a lot with the density for two dwellings. Building department: (518) 672-4471.
- Highway CommercialIn RC, RR and RA a detached caretaker or owner dwelling of up to 1,600 sq ft is also possible by special exception on a lot with the density for two dwellings. Building department: (518) 672-4471.
- Hamlet BusinessIn RC, RR and RA a detached caretaker or owner dwelling of up to 1,600 sq ft is also possible by special exception on a lot with the density for two dwellings. Building department: (518) 672-4471.
- Hamlet Business 1In RC, RR and RA a detached caretaker or owner dwelling of up to 1,600 sq ft is also possible by special exception on a lot with the density for two dwellings. Building department: (518) 672-4471.
- Commercial Industrial ParkIn RC, RR and RA a detached caretaker or owner dwelling of up to 1,600 sq ft is also possible by special exception on a lot with the density for two dwellings. Building department: (518) 672-4471.
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 Central Hudson 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 Town of Claverack has no local short-term rental law, and that is not the same as permission. Confirm with the building department before counting on short-term rental income. Separate question from whether you can build the unit.
- Zoning codewww.claverackny.gov/DocumentCenter/View/455/Town-of-Claverack-Zoning-Law-Local-Law-3-of-2015-PDF
- Building dept(518) 672-4471
Sizing up a specific parcel in Claverack?
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Building a full house instead?
A standard-finish house in Claverack runs $202–265/sq ft, about $365k–475k at 1,800 sq ft , plus roughly $16,346 for a conforming lot. See what it costs to build a house in Claverack.
ADU cost in nearby towns
All Columbia County towns: Hudson (City) · Ancram · Austerlitz · Canaan · Chatham · Clermont · Copake · Gallatin · Germantown · Ghent · Hillsdale · Kinderhook · Livingston · New Lebanon · Stockport · Stuyvesant · Taghkanic · Chatham (Village) · Kinderhook (Village) · Philmont (Village) · Valatie (Village)
More on Claverack: Can you build an ADU here? · Zoning for new construction · Columbia County build cost
ADU cost in Claverack: common questions
How much does it cost to build an ADU in Claverack, NY?
An 800 sq ft accessory dwelling unit in Town of Claverack runs roughly $195k–260k at a standard finish, general-contractor margin included. A 400 sq ft studio runs about $130k–170k. 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 Claverack?
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 $247–323/sq ft against $202–265/sq ft for a full house, even though it is the same trades doing the same work.
Are ADUs allowed in Claverack?
Town of Claverack has 9 districts. 7 districts allow ADUs with a special-use permit, 2 do not. Check the specific address with the free ADU checker or confirm with the building department at (518) 672-4471 before you spend money on design.
Can I rent an ADU in Claverack short term?
No local short-term-rental law on record - which is not the same as permission for Town of Claverack. 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 Columbia 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 Claverack vary by district and often carry exceptions this page does not show; zoning last reviewed 2026-08-16; verify with the building department at (518) 672-4471 before relying on any answer. Sources: the Offsite / Aldo cost engine and zoning dataset.