Corinth · ADU cost
What it costs to build an ADU in Corinth, NY
An 800 sq ft accessory dwelling unit in Corinth runs roughly $200k–260k, or about $249–327/sq ft, and that per-square-foot figure sits deliberately above the $204–268/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 Corinth 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 Corinth
Standard finish, slab on grade, on a flat and clear part of the lot, general-contractor margin included. These are structure costs at Saratoga County pricing, before the service and septic work a second dwelling can trigger.
| Size | Type | $ / sq ft | Estimated total |
|---|---|---|---|
| 400 sq ft | Studio | $331–$433 | $130k–175k |
| 600 sq ft | One bedroom | $276–$362 | $165k–215k |
| 800 sq ft | One bedroom, larger | $249–$327 | $200k–260k |
| 1,000 sq ft | Two bedroom | $233–$305 | $235k–305k |
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 | $28–$34 | $16 | 55% |
| Electrical | $18–$24 | $13 | 35% |
| HVAC | $23–$28 | $15 | 45% |
| Insulation | $7–$9 | $7 | — |
| Interior finishes | $32–$43 | $27 | 15% |
| Millwork & cabinetry | $18–$28 | $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 Corinth 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 |
|---|---|---|---|---|
| R-1 High Density Residential | 0.5 ac | 25 / 10 / 15 ft | — | No |
| R-2 Moderate Density Residential | 1 ac | 40 / 15 / 15 ft | — | No |
| SCH South Corinth Hamlet | 1 ac | 30 / 15 / 15 ft | — | No |
| R-R Rural Residential | 2 ac | 30 / 15 / 15 ft | — | No |
| C Commercial | 1 ac | 40 / 20 / 15 ft | — | No |
| OD-1 Overlay District 1 | 2 ac | 60 / 30 / 50 ft | — | No |
| OD-2 Overlay District 2 | 10 ac | 100 / 100 / 100 ft | — | No |
| I Industrial | 2 ac | 50 / 25 / 25 ft | — | No |
| LI Low Intensity Use | 3.2 ac | 40 / 20 / 15 ft | — | No |
| RM Resource Management | 42.7 ac | 150 / 75 / 100 ft | — | No |
| RU Rural Use | 8.5 ac | 75 / 75 / 100 ft | — | No |
| WF Wild Forest | 42.7 ac | - / 100 / 100 ft | — | No |
R-2 Moderate Density Residential - There is no utility reduction here: the absence of public water and sewer is the stated reason for the acre, so unlike R-1 nothing falls for connecting. A two-family dwelling takes the same acre but 150 ft of frontage against 100.
- Manufactured and modular homes are permitted uses on the identical standard, and the chapter names them as the district's intended housing types alongside single-family.
- An agricultural use needs twice the land of a house: at least 2 acres on 150 ft with a 20 ft side yard.
- A cemetery needs at least 10 acres on 300 ft with 30 ft side and rear yards, a driving range 10 acres on 400 ft with 150 ft front and 100 ft side and rear, and a golf course 160 acres on 400 ft.
- Agribusiness states its minimum lot width as 150/200, with nothing saying which of the two applies. Ask the Code Enforcement Officer.
- There is no multi-family and no townhouse standard in R-2 at all, so those uses are prohibited here.
- No height limit applies anywhere in this law.
R-R Rural Residential - A second unit costs nothing extra here: a two-family dwelling carries the same 2 acres, 200 ft and setbacks as a house, and a manufactured home matches it too. No height limit applies anywhere in this law.
- Home occupation I doubles the side and rear yards from 15 ft to 30 ft each, on the same 2 acres and 200 ft, so working from home takes more yard than the house itself.
- The site plan and special permit uses climb steeply. Agribusiness and forestry need at least 3 acres on 400 ft; day care I, a school and a veterinary clinic 3 acres.
- A cemetery, kennel, recreation facility or sawmill needs at least 5 acres, and a stable or riding academy 10 acres on 400 ft with 100 ft side and rear yards.
- A campground needs at least 42.7 acres on 500 ft with a 150 ft front yard, 200 ft side and rear and 20% coverage, and a golf course 160 acres.
- A train station needs at least 1.5 acres on 250 ft, and a park or place of worship 1 acre on 150 ft.
- Under § 89-13 more than one principal building is allowed on a lot where the lot area, width and every yard is met for each.
C Commercial - A multi-family dwelling is a site plan use on exactly these figures, so the Commercial district is where apartments are available in this town outside R-1. The commercial base standard also covers an antique shop, bank, day care, home occupation I, mixed use and office.
- A gasoline station, hotel, industry I, restaurant, self-service storage, marina or warehouse takes a 75 ft front yard, 50 ft side and 75 ft rear, and most also rise to 1.5 acres.
- Restaurants and drive-through restaurants need at least 1.5 acres on 250 ft, a veterinary clinic 1.5 acres on 250 ft with a 60 ft side yard, and a shopping center 2 acres on 250 ft.
- A club or lodge takes the 75 ft front, 50 ft side and 75 ft rear yards on only 1 acre and 150 ft.
- Personal service and a public parking garage are the smallest at 0.5 acre on 100 ft with a 15 ft side yard.
- A golf course needs at least 160 acres and a driving range 10 acres, both on 400 ft, the same as in the residential districts.
- The district lies inside the Adirondack Park, and the Agency is a second, independent approval: certain uses are Class A or B regional projects it reviews regardless of what the Town approves.
OD-1 Overlay District 1 - OD-1 carries one use and one only: an adult oriented business, subject to site plan review. Nothing else may be established here. The rear yard is deeper than the side yard, 50 ft against 30, which is the reverse of every other district in this law.
- No height limit applies anywhere in this law.
OD-2 Overlay District 2 - OD-2 carries one use and one only: a large-scale solar energy system, subject to site plan review. The 100 ft setback on every side, rather than the coverage cap, is what limits an array here.
- No height limit applies anywhere in this law.
I Industrial - These figures are the industry I standard. The heavier uses need far more land: industry II and manufacturing 5 acres, an industrial park, compost facility or transfer station 10 acres, and an airport 20 acres.
- An automotive dealer, automotive repair or service and heavy equipment repair need at least 1 acre on 200 ft with 40 ft front, 20 ft side and 15 ft rear yards and 60% coverage.
- An airport takes 100 ft on all three yards at 50% coverage, and no lot width is stated for it. A train station takes 1.5 acres on 250 ft at 60%.
- Mining is a special permit use with 100 ft setbacks, and no lot area or width is stated for it.
- An accessory use or accessory outdoor storage carries no lot minimum but still takes the district's 50 ft front, 25 ft side and 25 ft rear.
- No height limit applies anywhere in this law.
LI Low Intensity Use - Every use in the district takes this same standard: a single-family dwelling, a bed-and-breakfast, day care facility I, home occupation I, a hunting and fishing camp and cabin, a group camp and non-tower wireless alike, with no coverage figure on any of them.
- There is no two-family dwelling and no manufactured or modular home here, and no commercial use of any kind.
- The 3.2 acres is the Adirondack Park Agency low intensity use guideline, adopted by the Town as a real minimum lot area.
- The district lies inside the Adirondack Park, and the Agency is a second, independent approval: certain uses are Class A or B regional projects it reviews regardless of what the Town approves.
- No height limit applies anywhere in this law.
RM Resource Management - Every use in the district carries the same 42.7 acres and 500 ft; what changes from one to the next is the yards. The assembly and recreation uses triple the side and rear yards to 200 ft each and carry a 20% coverage cap.
- Those are agribusiness, a campground, a club or lodge, a group camp, a park, a recreation facility, a ski center and non-tower wireless. The residential uses carry no coverage figure at all.
- Forestry is the loosest at 75 ft front and 100 ft side and rear. There is no two-family, manufactured or modular home here, and no commercial use.
- The housing here is five uses: a single-family dwelling, day care facility I, home occupation I, a hunting and fishing camp and cabin, and home occupation II.
- Mining is a special permit use taking 150 ft front and 100 ft side and rear, and no lot area or width is stated for it.
- The district lies inside the Adirondack Park, and the Agency is a second, independent approval: certain uses are Class A or B regional projects it reviews regardless of what the Town approves.
- No height limit applies anywhere in this law.
RU Rural Use - The rear yard is deeper than the front here, 100 ft against 75. A bed-and-breakfast is the exception to the district: the same 8.5 acres, but 150 ft of frontage against a dwelling's 250 and yards of 40 ft front, 20 ft side and 15 ft rear.
- A cemetery needs at least 10 acres, a campground 15 acres on 400 ft, a group camp or ski center 20 acres and a golf course 160 acres.
- A commercial use needs at least 8.5 acres on 300 ft with a 75 ft front yard and 100 ft side and rear.
- A club or lodge and home occupation II are the only uses carrying a coverage figure, both 20%.
- There is no two-family, manufactured home or modular home standard here, so those uses are prohibited.
- The district lies inside the Adirondack Park, and the Agency is a second, independent approval: certain uses are Class A or B regional projects it reviews regardless of what the Town approves.
- No height limit applies anywhere in this law.
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 National Grid 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 Corinth has no local short-term rental law, and that is not the same as permission. Confirm with the Building Department before counting on short-stay income. Separate question from whether you can build the unit.
- Zoning codeecode360.com/CO1533/laws/LF1979096.pdf
- Building dept(518) 654-2012
Sizing up a specific parcel in Corinth?
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Building a full house instead?
A standard-finish house in Corinth runs $204–268/sq ft, about $370k–480k at 1,800 sq ft , plus roughly $6,850 for a conforming lot. See what it costs to build a house in Corinth.
ADU cost in nearby towns
All Saratoga County towns: Mechanicville (City) · Saratoga Springs (City) · Ballston · Charlton · Clifton Park · Day · Edinburg · Galway · Greenfield · Halfmoon · Malta · Milton · Moreau · Northumberland · Providence · Saratoga · Stillwater · Waterford · Wilton · Ballston Spa (Village) · Corinth (Village) · Round Lake (Village) · Schuylerville (Village) · South Glens Falls (Village) · Stillwater (Village) · Victory (Village) · Waterford (Village)
More on Corinth: Can you build an ADU here? · Zoning for new construction · Saratoga County build cost
ADU cost in Corinth: common questions
How much does it cost to build an ADU in Corinth, NY?
An 800 sq ft accessory dwelling unit in Town of Corinth runs roughly $200k–260k at a standard finish, general-contractor margin included. A 400 sq ft studio runs about $130k–175k. 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 Corinth?
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 $249–327/sq ft against $204–268/sq ft for a full house, even though it is the same trades doing the same work.
Are ADUs allowed in Corinth?
Town of Corinth has 12 districts. All districts prohibit ADUs. Check the specific address with the free ADU checker or confirm with the building department at (518) 654-2012 before you spend money on design.
Can I rent an ADU in Corinth short term?
No local short-term-rental law on record - which is not the same as permission for Town of Corinth. 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 Saratoga 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 Corinth vary by district and often carry exceptions this page does not show; zoning last reviewed 2026-08-01; verify with the building department at (518) 654-2012 before relying on any answer. Sources: the Offsite / Aldo cost engine and zoning dataset.