ADU · Ulster County

Can you build an ADU in Esopus, NY?

Town of Esopus has 13 districts. 9 districts allow ADUs, 4 do not. Check your address to confirm the district that applies to your parcel:

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What the Esopus code says

An accessory dwelling unit is permitted by right in RF-1, RF-2, R-40, R-12, RG, NC and BC: inside or attached to the house, or freestanding where the lot is at least twice the district minimum. 400 to 750 sq ft and never larger than the house.

Conditions the code attaches:

The lot has to have a detached one-family dwelling as its principal use; a lot occupied by a two-family, apartment, townhouse or condominium does not qualify.
Only one accessory unit is allowed per lot, and it cannot be sold separately from the main house.
The unit must be at least 400 square feet, no larger than 750 square feet or the livable floor area of the house, whichever is less, and no more than two bedrooms.
A freestanding unit is allowed on a building permit only where the lot is at least twice the district's minimum lot size.
On a smaller lot a freestanding unit needs site plan approval from the Planning Board.
The building inspector may refer even a by-right unit to the Planning Board for site plan review where the proposal raises site design concerns.
The unit cannot be used as a short-term rental for five years from the date its certificate of occupancy is issued.
A freestanding unit is limited to 15 feet in height and 45 feet in length and cannot stand in a required front yard.
One off-street parking space is required, and the water supply and sewage disposal method must be approved before the building permit is issued.

How big an ADU can be in Esopus

Size limits are set per district, and a unit inside the house is a different standard from a detached one. These are the figures the code publishes.

Accessory dwelling unit

400 to 750 sq ft of floor area, and smaller than the principal dwelling

RF1, RF2, R40, R12, RG, BC, NC · § 123-12A(4)(f)

Inside the principal dwelling

400 to 750 sq ft of floor area, and smaller than the principal dwelling

GC1, GC2 · § 123-12A(4)(f)

What the Esopus code indicates by district

The table below shows how each district treats ADUs, alongside the lot and setback standards that govern a second unit. District boundaries and conditions vary, so treat this as a starting point and confirm the district that applies to your parcel.

District	Min lot	Setbacks F / S / R	Max height	ADU
RF-1 Rural Farmland	4.59 ac	75 / 50 / 100 ft	35 ft	As of right
RF-2 Rural Farmland	2.3 ac	50 / 30 / 75 ft	35 ft	As of right
R-40 Residential	0.92 ac	40 / 20 / 35 ft	35 ft	As of right
R-12 Residential	0.29 ac	30 / 15 / 30 ft	35 ft	As of right
RG Residential Gateway	0.17 ac	4 / 10 / 20 ft	35 ft	As of right
BC Bluestone Commercial	0.17 ac	4 / 10 / 20 ft	35 ft	As of right
NC Neighborhood Commercial	0.46 ac	20 / 20 / 30 ft	35 ft	As of right
GC-1 General Commercial	0.92 ac	40 / 20 / 50 ft	35 ft	As of right
GC-2 General Commercial	0.92 ac	40 / 20 / 50 ft	35 ft	As of right
LI Light Industrial	2 ac	30 / 50 / 50 ft	35 ft	No
HI Heavy Industrial	10 ac	100 / 100 / 100 ft	50 ft	No
W Waterfront	—	20 / 20 / 20 ft	35 ft	No
WR Waterfront Residential	—	20 / 20 / 20 ft	15 ft	No

RF-1 Rural Farmland, RF-2 Rural Farmland, R-40 Residential, LI Light Industrial, HI Heavy Industrial - The number of dwelling units a parcel may have, and the number of new lots a subdivision may create, are set by the density calculation in § 123-24B rather than by the lot size shown here.

Further lot and yard rules are in § 123-24E through I.

R-12 Residential - The 12,500 sq ft minimum applies only where the lot is served by both central sewer and central water. With one of them the minimum is 25,000 sq ft at 17.5% coverage, on the same width, depth and yards.

With neither service the minimum lot area is 40,000 sq ft, the depth 150 ft, the yards 40 ft front, 20 ft side and 35 ft rear, and coverage is capped at 15%.
Base density and the maximum number of dwelling units on a parcel, or of new parcels a subdivision may create, are set under § 123-24B rather than by this schedule.
Further lot and yard regulations are in § 123-24E through I.

RG Residential Gateway, BC Bluestone Commercial - The figures shown assume both central sewer and water. A parcel not served by both takes the R-12 District's minimum lot size and density, a 40,000 sq ft minimum lot area, though the yards and coverage shown still apply.

The front yard is a range of 4 ft minimum to 10 ft maximum, and the figure shown is the minimum.
The schedule states no minimum lot depth.
Base density and the maximum number of dwelling units on a parcel, or of new parcels a subdivision may create, are set under § 123-24B rather than by this schedule.
Further lot and yard regulations are in § 123-24E through I.

NC Neighborhood Commercial - A one- or two-family dwelling takes the R-12 District's lot area and dimensions rather than the nonresidential figures shown: 12,500 sq ft on central sewer and water, 40,000 sq ft with neither.

For a dwelling the minimum lot depth is 100 ft on central sewer and water and 150 ft with neither.
Base density and the maximum number of dwelling units on a parcel, or of new parcels a subdivision may create, are set under § 123-24B rather than by this schedule.
Further lot and yard regulations are in § 123-24E through I.

GC-1 General Commercial, GC-2 General Commercial - A one- or two-family dwelling takes the R-12 District's lot area and dimensions rather than the nonresidential figures shown: 12,500 sq ft on central sewer and water, 40,000 sq ft with neither.

For a dwelling the minimum width is 100 ft, and the minimum depth 100 ft on central sewer and water or 150 ft with neither.
Base density and the maximum number of dwelling units on a parcel, or of new parcels a subdivision may create, are set under § 123-24B rather than by this schedule.
Further lot and yard regulations are in § 123-24E through I.

W Waterfront - The code sets no minimum lot area, no minimum lot depth and no maximum building coverage for W.

The number of dwelling units a parcel may have, and the number of new lots a subdivision may create, are set by the density calculation in § 123-24B rather than by the lot size shown here.
Further lot and yard rules are in § 123-24E through I.

WR Waterfront Residential - The code sets no minimum lot area, no minimum lot depth and no maximum building coverage for WR.

Maximum height is 15 ft, the lowest in the town.
The number of dwelling units a parcel may have, and the number of new lots a subdivision may create, are set by the density calculation in § 123-24B rather than by the lot size shown here.
Further lot and yard rules are in § 123-24E through I.

ADUs vs. short-term rentals in Esopus

Short-term rentals allowed with local rules for Town of Esopus. Short-term rental is a defined and regulated use in Esopus. § 123-61 splits it into owner-occupied and non-owner-occupied short-term rental, and which form is allowed on a given parcel, and whether a permit is needed, are not confirmed. These are separate questions from whether you can build an ADU — a unit you're allowed to add isn't automatically one you're allowed to rent nightly, so check both. Municipal source

Good to know

Residential lot minimum0.17–4.59 ac — an ADU still has to fit the district's lot and setback envelope.
UtilityCentral Hudson territory.
Zoning codeecode360.com/ES0782
Building dept(845) 338-6671

ADU FAQ — Esopus, NY

Are ADUs allowed in Esopus, NY?

Town of Esopus has 13 districts. 9 districts allow ADUs, 4 do not. Check your address with the free ADU checker, or confirm with the building department at (845) 338-6671.

Do I need a special permit for an ADU in Esopus?

No district in Town of Esopus requires a special-use permit for an ADU - 9 districts allow ADUs, 4 do not. Site-plan review or a building permit may still apply.

Can I use an ADU as a short-term rental in Esopus?

Short-term rentals allowed with local rules for Town of Esopus. ADU occupancy and short-term-rental rules are separate: an ADU you can build isn't automatically one you can rent nightly. Confirm both before you count on STR income.

Run the free ADU check for your parcel →

What an ADU costs to build in Esopus

Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $200k–265k at a standard finish, and the per-square-foot rate comes in above a full house because the kitchen, bath, panel and heating plant cost the same either way. See the full cost to build an ADU in Esopus, priced by size.

How we know this

Sections analyzed: 123 Attachment 1 Schedule of Permitted Uses; § 123-10 Schedule of Permitted Use Regulations; § 123-12A Accessory dwelling units
Districts confirmed: 13 of 13 — every mapped district.
Last reviewed: Apr 2026
Not covered here: Overlay districts, the zoning map, and any conditions attached to an individual parcel. Size limits and owner-occupancy terms sit in the code section above, not in this summary.

More on Esopus: Full zoning for new construction · ADU build cost · House build cost · ADU rules across Ulster County · All Ulster County towns

ADU information for Town of Esopus is compiled from the municipal code (last reviewed Apr 2026) and provided for decision-support only — not legal or architectural advice. ADU eligibility, size, owner-occupancy and permit conditions vary by district and often carry exceptions; verify with the building department at (845) 338-6671 before relying on any answer. Source: the Offsite / Aldo zoning dataset.