Newburgh · ADU cost
What it costs to build an ADU in Newburgh, NY
An 800 sq ft accessory dwelling unit in Newburgh runs roughly $205k–270k, or about $258–337/sq ft, and that per-square-foot figure sits deliberately above the $211–276/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 city 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 City of Newburgh maps 12 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 Newburgh
Standard finish, slab on grade, on a flat and clear part of the lot, general-contractor margin included. These are structure costs at Orange County pricing, before the service and septic work a second dwelling can trigger.
| Size | Type | $ / sq ft | Estimated total |
|---|---|---|---|
| 400 sq ft | Studio | $342–$447 | $135k–180k |
| 600 sq ft | One bedroom | $286–$374 | $170k–225k |
| 800 sq ft | One bedroom, larger | $258–$337 | $205k–270k |
| 1,000 sq ft | Two bedroom | $241–$315 | $240k–315k |
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–$11 | $8 | — |
| Foundation | $17–$24 | $17 | — |
| Framing | $26–$33 | $26 | — |
| Envelope - roof, siding, windows | $33–$42 | $33 | — |
| Plumbing | $29–$35 | $17 | 55% |
| Electrical | $19–$24 | $13 | 35% |
| HVAC | $24–$29 | $15 | 45% |
| Insulation | $8–$9 | $8 | — |
| Interior finishes | $33–$45 | $28 | 15% |
| Millwork & cabinetry | $19–$29 | $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 Newburgh 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 |
|---|---|---|---|---|
| Single-Family Residential | 0.057 ac | 15 / 10 / 20 ft | 40 ft | Special permit |
| Low-Density Residential | 0.057 ac | 15 / 10 / 20 ft | 40 ft | As of right |
| Medium-Density Residential | 0.057 ac | 10 / 5 / 20 ft | 40 ft | As of right |
| High-Density Residential | 0.046 ac | 0 / 5 / 20 ft | 45 ft | As of right |
| Commercial District | — | 0 / 0 / 0 ft | 45 ft | No |
| Industrial District | — | 0 / 0 / 0 ft | 45 ft | No |
| Neighborhood Commercial Overlay | — | 0 / 0 / 0 ft | 45 ft | No |
| Broadway Corridor District | — | 0 / 0 / 20 ft | 65 ft | No |
| Conservation Development District | — | — | 50 ft | No |
| Downtown Neighborhood | — | 0 / 0 / 20 ft | 75 ft | No |
| Waterfront Gateway | — | 0 / 0 / 20 ft | 95 ft | No |
| Planned Waterfront | — | 0 / - / - ft | 65 ft | No |
Single-Family Residential - A single-family house is the only use permitted in this district.
- A detached house may take less than the ten-foot side yard on one side if the adjacent use provides a ten-foot yard along the same lot line and the house keeps a full ten feet on its other side.
Low-Density Residential - A row or attached townhouse takes the same lot with shallower yards and forty percent coverage.
- A boardinghouse needs a special use permit and a lot of at least thirty-five hundred square feet, thirty feet of width and eighty feet of depth.
- A community centre or house of worship needs a lot of at least five thousand square feet and forty-five feet of width, with coverage up to fifty percent.
- A cottage industry needs a lot of at least twenty-five hundred square feet, with coverage up to sixty percent and height up to forty-five feet.
- A cemetery takes a lot of at least forty thousand square feet.
- A detached dwelling may take less than the ten-foot side yard on one side if the adjacent use provides ten feet along the same line and the dwelling keeps ten feet on the other.
Medium-Density Residential - An apartment house is measured per dwelling unit rather than by lot area, and is capped at ten units to a lot.
- Where a dwelling shares a common wall meeting the building and construction codes, no side yard is required.
- A live/work unit takes the same lot at forty percent coverage.
- A boardinghouse needs a lot of at least thirty-five hundred square feet and thirty feet of width.
High-Density Residential - An apartment house needs at least five hundred square feet per dwelling unit and may reach six storeys and sixty feet.
- A two-, three- or four-family dwelling inside a preexisting building may reach four storeys and forty-five feet.
- A government building or public library may cover seventy percent of the lot but is held to two and a half storeys and thirty-five feet.
- Where a dwelling shares a common wall meeting the building code, no side yard is required.
Commercial District, Industrial District, Neighborhood Commercial Overlay - A gasoline station, car wash, service and repair shop or boat repair yard must keep at least ten feet to the front, five to each side and ten to the rear, and is held to one or two storeys and fifteen or twenty-five feet.
- Brewing of malt beverages or spirits primarily for on-site consumption must keep at least ten feet on every side, with coverage up to seventy percent.
- A cemetery needs at least forty thousand square feet.
Broadway Corridor District - Height is a range with a floor as well as a ceiling: a building must reach at least three storeys and thirty-five feet. The district also requires at least eighty percent frontage occupancy and sets no lot coverage cap.
- In the TOD subdistrict south of Broadway between Lake and West Streets the range is four to six storeys and forty-five to seventy-five feet, the sixth storey only if set back fifteen feet.
- A front setback of up to ten feet is allowed only where the front yard has no parking and is landscaped and used as a plaza, pocket park, outdoor dining area or public art.
- A lot a hundred feet wide or more may have one side yard of twelve feet, but is not required to.
- The rear setback drops to five feet where the rear yard is dedicated to the City as public parking, and lots fronting on Broadway or within the TOD subdistrict need none.
- At least ten percent of the lot must be landscaped, except on lots fronting on Broadway or south of Broadway between West Street and Lake Street.
- A building must be of the shopfront or civic building type, with midrise buildings also allowed in parts of the district (§ 300-136C(1)).
Conservation Development District - Under § 300-33 the bulk and area requirements here are flexible in exchange for conserving environmental resources, with the possibility of more intensive development where the district's conservation goals are met.
Downtown Neighborhood - Height has a floor as well as a ceiling: a shopfront or midrise building must reach at least three storeys and thirty-five feet, and a rowhouse or compact detached house runs from two storeys and twenty-five feet to four storeys and fifty feet.
- At least eighty percent of the lot frontage must be built to the line.
- At least fifteen percent of the lot must be landscaped.
- A front setback of up to ten feet needs a parking-free yard landscaped as a plaza, pocket park, outdoor dining area or public art, or, for a house, an entrance feature connecting it to the sidewalk.
- A compact detached house may have two side yards totalling no more than twenty feet, none over fifteen feet.
- A rowhouse may have one side yard of between five and twelve feet.
- A lot a hundred feet wide or more may have one side yard of twelve feet but is not required to.
Waterfront Gateway - A shopfront or midrise building must reach at least five storeys and fifty feet, so a low building does not comply here; a rowhouse runs from three storeys and thirty feet to four storeys and fifty feet.
- At least eighty percent of the lot frontage must be built to the line.
- At least ten percent of the lot must be landscaped.
- A front setback of up to ten feet needs a parking-free yard landscaped as a plaza, pocket park, outdoor dining area or public art, or, for a house, an entrance feature connecting it to the sidewalk.
- A lot a hundred feet wide or more may have one side yard of twelve feet but is not required to, and a rowhouse may have one side yard of between five and twelve feet.
Planned Waterfront - A Hudson River setback of at least forty feet is measured landward from every point along the shoreline, bulkhead or stabilized shore, and no swimming pool, parking, balcony or porch may stand in it.
- A water-dependent use or structure may stand in the river setback with Planning Board approval.
- No side yard is required, but one that is provided must be at least eight feet and no more than fifteen.
- A shopfront or midrise building must reach at least five storeys and fifty feet, and a rowhouse runs from two storeys and twenty-five feet to four storeys and fifty feet.
- At least eighty percent of the lot frontage must be built to the line.
- At least fifteen percent of the lot must be landscaped.
- A front setback of up to ten feet needs a parking-free yard landscaped as a plaza, pocket park, outdoor dining area or public art, or, for a house, an entrance feature connecting it to the sidewalk.
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 rentalsShort-term rentals allowed with local rules. Short-term in-home lodging is a regulated accessory use in the City of Newburgh's residential districts only, and is not permitted in the commercial and industrial base districts. Separate question from whether you can build the unit.
- Zoning codeecode360.com/30538878
- Building dept(845) 569-7400
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Building a full house instead?
A standard-finish house in Newburgh runs $211–276/sq ft, about $380k–495k at 1,800 sq ft . See what it costs to build a house in Newburgh.
ADU cost in nearby towns
All Orange County towns: Middletown (City) · Port Jervis (City) · Blooming Grove · Chester · Cornwall · Crawford · Deerpark · Goshen · Greenville · Hamptonburgh · Highlands · Minisink · Monroe · Montgomery · Mount Hope · New Windsor · Newburgh · Palm Tree · Tuxedo · Wallkill · Warwick · Wawayanda · Chester (Village) · Cornwall-on-Hudson (Village) · Florida (Village) · Goshen (Village) · Greenwood Lake (Village) · Harriman (Village) · Highland Falls (Village) · Kiryas Joel (Village) · Maybrook (Village) · Monroe (Village) · Montgomery (Village) · Otisville (Village) · South Blooming Grove (Village) · Tuxedo Park (Village) · Walden (Village) · Warwick (Village) · Washingtonville (Village) · Woodbury (Village)
More on Newburgh: Can you build an ADU here? · Zoning for new construction · Orange County build cost
ADU cost in Newburgh: common questions
How much does it cost to build an ADU in Newburgh, NY?
An 800 sq ft accessory dwelling unit in City of Newburgh runs roughly $205k–270k at a standard finish, general-contractor margin included. A 400 sq ft studio runs about $135k–180k. 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 Newburgh?
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 $258–337/sq ft against $211–276/sq ft for a full house, even though it is the same trades doing the same work.
Are ADUs allowed in Newburgh?
City of Newburgh has 12 districts. 8 districts prohibit ADUs, 3 allow them, 1 requires a special-use permit. Check the specific address with the free ADU checker or confirm with the building department at (845) 569-7400 before you spend money on design.
Can I rent an ADU in Newburgh short term?
Short-term rentals allowed with local rules for City of Newburgh. 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 Orange 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 City of Newburgh vary by district and often carry exceptions this page does not show; zoning last reviewed 2026-07-08; verify with the building department at (845) 569-7400 before relying on any answer. Sources: the Offsite / Aldo cost engine and zoning dataset.