Woodridge · ADU cost
What it costs to build an ADU in Woodridge, NY
An 800 sq ft accessory dwelling unit in Woodridge 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 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 Woodridge maps 5 districts that treat accessory units differently from one another, so read the table below as a starting point rather than a verdict.
Check a specific parcel for an ADU in Aldo, free →
ADU cost by size in Woodridge
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 Woodridge 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 |
|---|---|---|---|---|
| Residential Resort | 0.46 ac | 60 / 25 / 25 ft | 35 ft | No |
| Low Density Residential | 0.23 ac | 40 / 12 / 30 ft | 35 ft | No |
| Moderate to High Density Residential | 0.23 ac | 35 / 12 / 25 ft | 50 ft | No |
| Village Commercial | 0.17 ac | 0 / 10 / 10 ft | 50 ft | No |
| Business and Light Industrial | 0.11 ac | 0 / 10 / 10 ft | 50 ft | No |
Residential Resort - A lot here needs 20,000 square feet with central sewer and water, and 75 feet of width. A building sits 60 feet back from the front line, 25 feet from each side with 60 feet for both, and 25 feet from the rear, and reaches 35 feet.
- Without central sewer and water the lot needs 40,000 square feet, which is 0.9183 acre, and 150 feet of width.
- The building footprint may cover 15% of the lot and hard surface 20%, because the chapter counts the building together with every impervious surface.
- A cluster subdivision needs a special permit and may put a dwelling on 7,500 square feet, which is 0.1722 acre, with central sewer and water, or 40,000 square feet without.
- A two family dwelling needs the equivalent of two minimum sized lots in lot area, because the standards apply to each dwelling unit.
- A yard bordering a lake, stream or body of water listed by the state Department of Environmental Conservation runs at least 100 feet deep, apart from boathouses and docks.
- A manufactured home is allowed only inside an approved manufactured home park, and the park needs a special permit.
Low Density Residential - A lot here needs 10,000 square feet and 85 feet of width. A building sits 40 feet back from the front line, 12 feet from each side with 30 feet for both, and 30 feet from the rear, and reaches 35 feet.
- The building footprint may cover 20% of the lot and hard surface 30%, because the chapter counts the building together with every impervious surface.
- A cluster subdivision needs a special permit and may put a dwelling on 7,500 square feet, which is 0.1722 acre, with central sewer and water, or 40,000 square feet, which is 0.9183 acre, without.
- A two family dwelling needs the equivalent of two minimum sized lots in lot area, because the standards apply to each dwelling unit.
- A residential lot needs a front lot line at least 50 feet long, which is frontage rather than lot width.
- A residential land development on municipal sewer and water is figured at 10,000 square feet a dwelling unit, on this district's standards, with clearing held to 60%.
- A yard bordering a lake, stream or body of water listed by the state Department of Environmental Conservation runs at least 100 feet deep, apart from boathouses and docks.
Moderate to High Density Residential - A lot here needs 10,000 square feet and 75 feet of width. A building sits 35 feet back from the front line, 12 feet from each side with 30 feet for both, and 25 feet from the rear, and reaches 50 feet.
- The building footprint may cover 30% of the lot and hard surface 40%, because the chapter counts the building together with every impervious surface.
- A cluster subdivision needs a special permit and may put a dwelling on 7,500 square feet, which is 0.1722 acre, with central sewer and water, or 40,000 square feet, which is 0.9183 acre, without.
- A two family dwelling needs the equivalent of two minimum sized lots in lot area, because the standards apply to each dwelling unit.
- A multifamily dwelling needs a special permit, and its side yard grows by 10 feet for each dwelling unit over two in the structure.
- Multifamily density is held to the dwelling units per acre the district would allow if the land were developed for one family use.
- A yard bordering a lake, stream or body of water listed by the state Department of Environmental Conservation runs at least 100 feet deep, apart from boathouses and docks.
Village Commercial - A lot here needs 7,500 square feet and 50 feet of width, and the schedule asks for no front yard. A building sits 10 feet from each side with 20 feet for both and 10 feet from the rear, and reaches 50 feet.
- The building footprint may cover 50% of the lot and hard surface 75%, because the chapter counts the building together with every impervious surface.
- Where firewalls are provided the side yards may be waived, so buildings may directly adjoin.
- A cluster subdivision needs a special permit, and without central sewer and water no dwelling may sit on less than 40,000 square feet, which is 0.9183 acre.
- A multifamily dwelling needs a special permit, and its side yard grows by 10 feet for each dwelling unit over two in the structure.
- A two family dwelling needs the equivalent of two minimum sized lots in lot area, because the standards apply to each dwelling unit.
- A yard bordering a lake, stream or body of water listed by the state Department of Environmental Conservation runs at least 100 feet deep, apart from boathouses and docks.
Business and Light Industrial - A lot here needs 5,000 square feet and 50 feet of width, and the schedule asks for no front yard. A building sits 10 feet from each side with 20 feet for both and 10 feet from the rear, and reaches 50 feet.
- The building footprint may cover 50% of the lot and hard surface 75%, because the chapter counts the building together with every impervious surface.
- Where firewalls are provided the side yards may be waived, so buildings may directly adjoin.
- A cluster subdivision is not available in this district.
- Annual membership clubs, clubhouses, essential services and public buildings are the uses permitted outright; everything else needs a special permit.
- A public garage for more than five motor vehicles may not have an entrance or exit within 50 feet of a residential district.
- A yard bordering a lake, stream or body of water listed by the state Department of Environmental Conservation runs at least 100 feet deep, apart from boathouses and docks.
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 Village of Woodridge has no short-term rental law of its own, and that is not the same as permission. The Town of Fallsburg's short-term rental law, Chapter 225, may apply, so confirm with the building department before counting on the use. Separate question from whether you can build the unit.
- Zoning codeecode360.com/WO1303
- Building dept(845) 434-6712
Sizing up a specific parcel in Woodridge?
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 Woodridge runs $195–256/sq ft, about $350k–460k at 1,800 sq ft , plus roughly $6,598 for a conforming lot. See what it costs to build a house in Woodridge.
ADU cost in nearby towns
All Sullivan County towns: Bethel · Callicoon · Cochecton · Delaware · Fallsburg · Forestburgh · Fremont · Highland · Liberty · Lumberland · Mamakating · Neversink · Rockland · Thompson · Tusten · Bloomingburg (Village) · Jeffersonville (Village) · Liberty (Village) · Monticello (Village)
More on Woodridge: Can you build an ADU here? · Zoning for new construction · Sullivan County build cost
ADU cost in Woodridge: common questions
How much does it cost to build an ADU in Woodridge, NY?
An 800 sq ft accessory dwelling unit in Village of Woodridge 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 Woodridge?
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 Woodridge?
Village of Woodridge has 5 districts. All districts prohibit ADUs. Check the specific address with the free ADU checker or confirm with the building department at (845) 434-6712 before you spend money on design.
Can I rent an ADU in Woodridge short term?
No local short-term-rental law on record - which is not the same as permission for Village of Woodridge. 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 Village of Woodridge 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) 434-6712 before relying on any answer. Sources: the Offsite / Aldo cost engine and zoning dataset.