Millerton · ADU cost
What it costs to build an ADU in Millerton, NY
An 800 sq ft accessory dwelling unit in Millerton runs roughly $210k–275k, or about $263–345/sq ft, and that per-square-foot figure sits deliberately above the $215–282/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 Millerton maps 10 districts that treat accessory units differently from one another, so read the table below as a starting point rather than a verdict.
ADU cost by size in Millerton
Standard finish, slab on grade, on a flat and clear part of the lot, general-contractor margin included. These are structure costs at Dutchess County pricing, before the service and septic work a second dwelling can trigger.
| Size | Type | $ / sq ft | Estimated total |
|---|---|---|---|
| 400 sq ft | Studio | $349–$457 | $140k–185k |
| 600 sq ft | One bedroom | $292–$382 | $175k–230k |
| 800 sq ft | One bedroom, larger | $263–$345 | $210k–275k |
| 1,000 sq ft | Two bedroom | $246–$322 | $245k–320k |
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 | $8–$12 | $8 | — |
| Foundation | $17–$24 | $17 | — |
| Framing | $27–$34 | $27 | — |
| Envelope - roof, siding, windows | $34–$43 | $34 | — |
| Plumbing | $29–$36 | $17 | 55% |
| Electrical | $19–$25 | $13 | 35% |
| HVAC | $24–$30 | $15 | 45% |
| Insulation | $8–$10 | $8 | — |
| Interior finishes | $34–$46 | $29 | 15% |
| Millwork & cabinetry | $19–$29 | $12 | 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 Millerton 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 |
|---|---|---|---|---|
| Low Density Residential | 1 ac | 50 / 10 / 25 ft | 35 ft | Special permit |
| Medium Density Residential | 0.4591 ac | 30 / 10 / 25 ft | 35 ft | Special permit |
| High Density Residential | 0.2296 ac | 30 / 8 / 25 ft | 35 ft | Special permit |
| General Business | — | — | 35 ft | No |
| Planned Residential/Business | — | — | 35 ft | — |
| Limited Business | 1 ac | 50 / 20 / 50 ft | 35 ft | — |
| Highway Business District I | 1 ac | 80 / 20 / 50 ft | 35 ft | No |
| Highway Business District II | 1 ac | 80 / 20 / 50 ft | 35 ft | No |
| Land Conservation | 1 ac | 80 / 50 / 50 ft | 35 ft | No |
| Industrial | 3 ac | 60 / 35 / 35 ft | 35 ft | No |
Low Density Residential — Residential dwelling units may be clustered under § 7-738 of the Village Law, and the Planning Board may allow a density bonus of up to 20% more units where central water AND central sewers are provided and at least 40% of the development is preserved as recreation or open space. The front yard is TWO measurements and the greater governs: 50 ft from the street line or 75 ft from the CENTRE LINE of the street. The figure recorded is the street-line one. Minimum lot width at the front building line is 200 ft on an interior lot and 210 ft on a corner lot. On a corner lot BOTH yards abutting streets are front yards, and there is then one rear yard of at least 25 ft and one side yard of at least 10 ft. The side yard is published as a total: two side yards adding to at least 30 ft, with the narrower no less than 1/3 of that total, which is where the 10 ft single-side figure comes from. No driveway centre line may meet a street line within 70 ft of the intersection of any two street lines.
Medium Density Residential — Almost everything in R20,000 turns on central sewer, and the base row is the UNSEWERED case. Without a central sewer the lot must be 200 ft wide on an interior lot and 210 ft on a corner, and coverage is capped at 7%; with one, those become 115 ft, 125 ft and 15%. The minimum area per dwelling unit is 20,000 sq ft with a central sewer, and without one whatever the Dutchess County Department of Health determines but never less than 20,000. A one-family dwelling may still be built on a lot under 20,000 sq ft that existed before the chapter and is not adjoined at the side by vacant land in the same ownership. The front yard is TWO measurements and the greater governs: 30 ft from the street line or 55 ft from the CENTRE LINE of the street. The figure recorded is the street-line one. Minimum lot width at the front building line is 200 ft on an interior lot and 210 ft on a corner lot. On a corner lot BOTH yards abutting streets are front yards, and there is then one rear yard of at least 25 ft and one side yard of at least 10 ft. The side yard is published as a total: two side yards adding to at least 30 ft, with the narrower no less than 1/3 of that total, which is where the 10 ft single-side figure comes from. No driveway centre line may meet a street line within 70 ft of the intersection of any two street lines.
High Density Residential — R10,000 sets a different side yard for every housing type, and the base row is the single-family one at a 24 ft combined minimum. A two-family dwelling needs 30 ft combined, a semidetached dwelling one side yard of 15 ft, and a multifamily building or a row of townhouses 36 ft combined plus a further 6 ft for every unit beyond three — so a six-unit building needs 54 ft. A NONDWELLING structure is different again: 75 ft from the street centre line, a 35 ft rear yard and 60 ft of combined side yard. The minimum area per dwelling unit is 10,000 sq ft, or 5,000 for a multifamily, row or townhouse building of three or more units; without a central sewer the Dutchess County Department of Health sets it, never below those figures. The front yard is TWO measurements and the greater governs: 30 ft from the street line or 55 ft from the CENTRE LINE of the street. The figure recorded is the street-line one. Minimum lot width at the front building line is 80 ft on an interior lot and 94 ft on a corner lot. On a corner lot BOTH yards abutting streets are front yards, and there is then one rear yard of at least 25 ft and one side yard of at least 10 ft. The side yard is published as a total: two side yards adding to at least 24 ft, with the narrower no less than 1/3 of that total, which is where the 8 ft single-side figure comes from. No driveway centre line may meet a street line within 70 ft of the intersection of any two street lines.
General Business — General Business publishes no lot area, no lot width and no numeric yards. What it sets instead is that a building on a lot abutting a NONBUSINESS district must meet that district's side or rear yard requirement on the abutting side, so the governing figure depends on the neighbour. All buildings must be of fire-resistant construction. Floor area ratio is capped at 0.3. No driveway centre line may meet a street line within 70 ft of the intersection of any two street lines.
Planned Residential/Business — The front yard is 30 ft from the CENTRE LINE of the road, or the existing setback of the building already there, whichever is greater. A lot abutting a nonbusiness district must meet that district's side or rear yard on the abutting side. All parking must go behind the building, all buildings must be fire-resistant, and a lot abutting a nonbusiness district needs a 15 ft planted buffer of shrubs and trees along the side and rear lines. All uses need site plan approval. Floor area ratio is capped at 0.3. No driveway centre line may meet a street line within 70 ft of the intersection of any two street lines.
Limited Business — The one-acre minimum is per ESTABLISHMENT rather than per lot. Nothing may encroach into the front yard except a fence or wall no more than 6 ft high or a sign no larger than 20 sq ft, and no commercial use at all. Parking must be to the side or rear and no closer than 20 ft to any property line. A lot may have one entrance and one exit per establishment per street, at least 100 ft apart and no more than 50 ft wide. A lot abutting a nonbusiness district needs a 15 ft planted buffer. Minimum lot width at the front building line is 200 ft on an interior lot and 240 ft on a corner lot. On a corner lot BOTH yards abutting streets are front yards, and there is then one rear yard of at least 50 ft and one side yard of at least 20 ft. The side yard is published as a total: two side yards adding to at least 60 ft, with the narrower no less than 1/3 of that total, which is where the 20 ft single-side figure comes from. Floor area ratio is capped at 0.3. No driveway centre line may meet a street line within 70 ft of the intersection of any two street lines.
Highway Business District I — The one-acre minimum is per ESTABLISHMENT. A SHOPPING CENTRE, which the Planning Board may permit by special permit, needs five acres and 400 ft of width at the front building line instead. Nothing may encroach into the front yard except a fence or wall no more than 6 ft high, a sign no larger than 20 sq ft, or parking for no more than 25 cars. All uses need site plan approval. Minimum lot width at the front building line is 200 ft on an interior lot and 240 ft on a corner lot. On a corner lot BOTH yards abutting streets are front yards, and there is then one rear yard of at least 50 ft and one side yard of at least 20 ft. The side yard is published as a total: two side yards adding to at least 60 ft, with the narrower no less than 1/3 of that total, which is where the 20 ft single-side figure comes from. No driveway centre line may meet a street line within 70 ft of the intersection of any two street lines.
Highway Business District II — The one-acre minimum is per ESTABLISHMENT. Nothing may encroach into the front yard except a fence or wall no more than 6 ft high, a sign no larger than 20 sq ft, or parking for no more than 25 cars. Minimum lot width at the front building line is 200 ft on an interior lot and 240 ft on a corner lot. On a corner lot BOTH yards abutting streets are front yards, and there is then one rear yard of at least 50 ft and one side yard of at least 20 ft. The side yard is published as a total: two side yards adding to at least 60 ft, with the narrower no less than 1/3 of that total, which is where the 20 ft single-side figure comes from. No driveway centre line may meet a street line within 70 ft of the intersection of any two street lines.
Land Conservation — The one-acre minimum is per ESTABLISHMENT. No building construction AND no automobile parking may encroach into the 80 ft front yard, and neither a building nor a parking space may come within 50 ft of a side or rear property line. A one- or two-family dwelling is allowed only by special permit, only where the builder can show the structure would not sit in a floodplain, and then at the density of the nearest adjoining residential district. No driveway centre line may meet a street line within 70 ft of the intersection of any two street lines.
Industrial — The three-acre minimum is per ESTABLISHMENT. Each of the two side yards must be 35 ft — this is one of the few districts where the figure is per side rather than a combined total. No parking space may come within 20 ft of the street line. Entrance and exit centre lines must be at least 100 ft apart and no wider than 50 ft. The front yard is TWO measurements and the greater governs: 60 ft from the street line or 85 ft from the CENTRE LINE of the street. The figure recorded is the street-line one. Floor area ratio is capped at 1.8. No driveway centre line may meet a street line within 70 ft of the intersection of any two street lines.
Size limits on record in Millerton
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 Millerton:
- Low Density ResidentialMinimum 300 sq ft; inside a principal dwelling capped at 35% of total floor area unless the Board of Appeals finds otherwise; two bedrooms max
- Medium Density ResidentialMinimum 300 sq ft; inside a principal dwelling capped at 35% of total floor area unless the Board of Appeals finds otherwise; two bedrooms max
- High Density ResidentialMinimum 300 sq ft; inside a principal dwelling capped at 35% of total floor area unless the Board of Appeals finds otherwise; two bedrooms max
- General BusinessMinimum 300 sq ft; inside a principal dwelling capped at 35% of total floor area unless the Board of Appeals finds otherwise; two bedrooms max
- Planned Residential/BusinessMinimum 300 sq ft; inside a principal dwelling capped at 35% of total floor area unless the Board of Appeals finds otherwise; two bedrooms max
- Limited BusinessMinimum 300 sq ft; inside a principal dwelling capped at 35% of total floor area unless the Board of Appeals finds otherwise; two bedrooms max
- Highway Business District IMinimum 300 sq ft; inside a principal dwelling capped at 35% of total floor area unless the Board of Appeals finds otherwise; two bedrooms max
- Highway Business District IIMinimum 300 sq ft; inside a principal dwelling capped at 35% of total floor area unless the Board of Appeals finds otherwise; two bedrooms max
- Land ConservationMinimum 300 sq ft; inside a principal dwelling capped at 35% of total floor area unless the Board of Appeals finds otherwise; two bedrooms max
- IndustrialMinimum 300 sq ft; inside a principal dwelling capped at 35% of total floor area unless the Board of Appeals finds otherwise; two bedrooms max
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. No local STR registration law as of Jun 2026. Dutchess County occupancy tax registration required. Verify with Village of Millerton Village Clerk at (518) 789-4867 for any recent local law changes. Separate question from whether you can build the unit.
- Zoning codeecode360.com/13303648
- Building dept(518) 789-4867
Sizing up a specific parcel in Millerton?
Aldo pulls the exact zoning district, setbacks, and build feasibility for any parcel — before you buy. Enter your email to open Aldo and run your free report.
Building a full house instead?
A standard-finish house in Millerton runs $215–282/sq ft, about $390k–510k at 1,800 sq ft . See what it costs to build a house in Millerton.
ADU cost in nearby towns
All Dutchess County towns: Beacon (City) · Poughkeepsie (City) · Amenia · Beekman · Clinton · Dover · East Fishkill · Fishkill · Hyde Park · La Grange · Milan · North East · Pawling · Pine Plains · Pleasant Valley · Poughkeepsie · Red Hook · Rhinebeck · Stanford · Union Vale · Wappinger · Washington · Fishkill (Village) · Millbrook (Village) · Pawling (Village) · Red Hook (Village) · Rhinebeck (Village) · Tivoli (Village) · Wappingers Falls (Village)
More on Millerton: Can you build an ADU here? · Zoning for new construction · Dutchess County build cost
ADU cost in Millerton: common questions
How much does it cost to build an ADU in Millerton, NY?
An 800 sq ft accessory dwelling unit in Village of Millerton runs roughly $210k–275k at a standard finish, general-contractor margin included. A 400 sq ft studio runs about $140k–185k. 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 Millerton?
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 $263–345/sq ft against $215–282/sq ft for a full house, even though it is the same trades doing the same work.
Are ADUs allowed in Millerton?
Village of Millerton has 10 districts. 5 districts prohibit ADUs, 3 require a special-use permit. 2 districts have incomplete data - verify with the building department at (518) 789-4867. Check the specific address with the free ADU checker before you spend money on design.
Can I rent an ADU in Millerton short term?
No local short-term-rental law on record - which is not the same as permission for Village of Millerton. 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 Dutchess 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 Millerton 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) 789-4867 before relying on any answer. Sources: Offsite / Aldo cost engine (costEngine.js + constants.js); zoning dataset (municipalData.js).