ADU · Dutchess County

Can you build an ADU in East Fishkill, NY?

Town of East Fishkill has 15 districts. 10 districts prohibit ADUs, 5 allow them with occupancy restrictions. Check your address to confirm the district that applies to your parcel:

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What the East Fishkill code says

In R-3, R-2, R-1, R-1/3 and CRD an accessory apartment needs only a Building Department permit, the owner must live in one of the units, and a new owner must apply for renewal. It is not permitted in B-1, B-2, B-3, B-1A, HC, I-1, I-2, I-3, PCP or PRDP.

Conditions the code attaches:

Inside the house the unit must be at least 400 sq ft and no more than 50% of the habitable floor space or 1,000 sq ft, whichever is less.
In an outbuilding the unit must be at least 400 sq ft and no more than half the building, and meet the house's side and rear yards.
No permit until five years after the certificate of occupancy for the house or outbuilding, and no footprint expansion over 100 sq ft.
One apartment per lot, none in a two-family or multifamily dwelling, no renting of rooms, and a deed covenant barring accessory apartments defeats the right to one.
On a conforming R-1, R-2 or R-3 lot of at least 10 acres with road access, one estate cottage is also permitted by right, owner-occupied.
An estate cottage has two bedrooms, 600 to 1,500 sq ft and no more than half the house, and its septic must be certified.

How big an ADU can be in East Fishkill

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.

Inside the principal dwelling

At least 400 sq ft, and no more than 50% of the principal dwelling, or 1,000 sq ft of habitable floor space — whichever is smaller

R-3, R-2, R-1, R-1/3, CRD · owner-occupancy required · § 194-91B(3), (4)(a)

What the East Fishkill 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
Residential 3-Acre	3 ac	50 / 30 / 50 ft	35 ft	Occupancy restricted
Residential 2-Acre	2 ac	50 / 30 / 50 ft	35 ft	Occupancy restricted
Residential 1-Acre	1 ac	50 / 25 / 50 ft	35 ft	Occupancy restricted
Residential 1/3-Acre	0.33 ac	35 / 15 / 30 ft	35 ft	Occupancy restricted
Conservation Residential District	0.16 ac	20 / 15 / 30 ft	35 ft	Occupancy restricted
Planned Commercial Park	20 ac	100 / 50 / 50 ft	50 ft	No
Planned Research and Development Park	5 ac	100 / 50 / 80 ft	40 ft	No
General Business	—	40 / 10 / 20 ft	30 ft	No
Central Business	—	40 / 10 / 20 ft	30 ft	No
Mixed-Use	—	25 / 10 / 20 ft	35 ft	No
Hamlet Center	—	10 / 5 / 15 ft	35 ft	No
Transitional	2 ac	75 / 25 / 20 ft	30 ft	No
Light Industrial	1 ac	50 / 20 / 20 ft	30 ft	No
Heavy Industrial	1 ac	50 / 20 / 30 ft	45 ft	No
Light Industrial/Retail	1 ac	100 / 20 / 30 ft	35 ft	No

Residential 3-Acre - A parcel abutting a state or county road outside the designated hamlet areas needs a 100 ft setback from the edge of pavement to any building, and one abutting the Taconic State Parkway or I-84 a 100 ft buffer to any structure, building or parking area.

Both 100 ft rules override any less restrictive yard requirement elsewhere in the code.
Minimum frontage is 75 ft, a separate test from lot width and depth, and all three must be met.
Where a property abuts a road never dedicated to the Town, county or state, 25 ft is added to the setback and it is measured from the centre line of the road.
Lot size is subject to the Environmentally Sensitive Lands Law (§ 194-14.1), which can raise the requirement on a constrained parcel.
Height is also capped at 2 1/2 stories.
On a flag lot the accessway is excluded from lot area, the lot must be at least one acre, and it needs 50 ft of street frontage and a strip at least 50 ft wide along its length (§ 194-92.1).

Residential 2-Acre, Residential 1-Acre, Residential 1/3-Acre - A parcel abutting a state or county road outside the designated hamlet areas needs a 100 ft setback from the edge of pavement to any building, and one abutting the Taconic State Parkway or I-84 a 100 ft buffer to any structure, building or parking area.

Both 100 ft rules override any less restrictive yard requirement elsewhere in the code.
Minimum frontage is 50 ft, a separate test from lot width and depth, and all three must be met.
Where a property abuts a road never dedicated to the Town, county or state, 25 ft is added to the setback and it is measured from the centre line of the road.
Lot size is subject to the Environmentally Sensitive Lands Law (§ 194-14.1), which can raise the requirement on a constrained parcel.
Height is also capped at 2 1/2 stories.
On a flag lot the accessway is excluded from lot area, the lot must be at least one acre, and it needs 50 ft of street frontage and a strip at least 50 ft wide along its length (§ 194-92.1).

Conservation Residential District - The parcel being developed must be at least 150 acres with 100 ft of frontage on a state or county highway, and the lot figures shown are for a single-family detached home. A semidetached dwelling or attached end unit needs 4,000 sq ft, and an attached unit 2,500 sq ft.

Further CRD development standards are in § 194-22.
On a parcel abutting the Taconic State Parkway or I-84, a 100 ft buffer applies to any structure, building or parking area, overriding any less restrictive yard requirement.
On a parcel abutting a state or county road outside the designated hamlet areas, buildings must be 100 ft from the edge of pavement, overriding any less restrictive yard requirement.
Where a property abuts a road never dedicated to the Town, county or state, 25 ft is added to the setback and it is measured from the centre line of the road.
Lot size is subject to the Environmentally Sensitive Lands Law (§ 194-14.1), which can raise the requirement on a constrained parcel.
Height is also capped at 2 1/2 stories.

Planned Commercial Park - Every use needs site plan approval under Article VII. Lot coverage is capped at 50% alongside the 25% building coverage cap, and at least 20% of the lot must be open space.

Height is also capped at 4 stories.
On a parcel abutting the Taconic State Parkway or I-84, a 100 ft buffer applies to any structure, building or parking area, overriding any less restrictive yard requirement.
On a parcel abutting a state or county road outside the designated hamlet areas, buildings must be 100 ft from the edge of pavement, overriding any less restrictive yard requirement.
Where a property abuts a road never dedicated to the Town, county or state, 25 ft is added to the setback and it is measured from the centre line of the road.
Lot size, coverage and floor area ratio are subject to the Environmentally Sensitive Lands Law (§ 194-14.1), which can raise the requirement on a constrained parcel.
No access other than emergency access may run to or from a residential district.

Planned Research and Development Park - The five-acre minimum may vary under § 194-55, which adds further requirements, and for lots created before L.L. No. 4-1993 the Town Board may set less restrictive bulk standards (§ 194-55E).

Lot coverage is capped at 50% alongside the 25% building coverage cap, and at least 20% of the lot must be open space.
Height is also capped at 3 stories.
On a parcel abutting the Taconic State Parkway or I-84, a 100 ft buffer applies to any structure, building or parking area, overriding any less restrictive yard requirement.
On a parcel abutting a state or county road outside the designated hamlet areas, buildings must be 100 ft from the edge of pavement, overriding any less restrictive yard requirement.
Lot size, coverage and floor area ratio are subject to the Environmentally Sensitive Lands Law (§ 194-14.1), which can raise the requirement on a constrained parcel.
No access other than emergency access may run to or from a residential district.

General Business, Central Business - Every use needs site plan approval under Article VII, and total lot coverage is capped at 75% alongside the 35% building coverage cap. Along State Route 52 west of the Taconic Parkway, the front setback in the commercial district is 100 ft.

Where the lot abuts a residential district, the side yard on the abutting side is 20 ft.
Height is also capped at 2 stories.
On a parcel abutting the Taconic State Parkway or I-84, a 100 ft buffer applies to any structure, building or parking area, overriding any less restrictive yard requirement.
On a parcel abutting a state or county road outside the designated hamlet areas, buildings must be 100 ft from the edge of pavement, overriding any less restrictive yard requirement.
Lot size, coverage and floor area ratio are subject to the Environmentally Sensitive Lands Law (§ 194-14.1), which can raise the requirement on a constrained parcel.
No access other than emergency access may run to or from a residential district.

Mixed-Use - Total lot coverage is capped at 75% alongside the 50% building coverage cap, and where the lot abuts a residential district the side yard on the abutting side is 20 ft.

Height is also capped at 2.5 stories.
On a parcel abutting the Taconic State Parkway or I-84, a 100 ft buffer applies to any structure, building or parking area, overriding any less restrictive yard requirement.
On a parcel abutting a state or county road outside the designated hamlet areas, buildings must be 100 ft from the edge of pavement, overriding any less restrictive yard requirement.
Where a property abuts a road never dedicated to the Town, county or state, 25 ft is added to the setback and it is measured from the centre line of the road.
Lot size, coverage and floor area ratio are subject to the Environmentally Sensitive Lands Law (§ 194-14.1), which can raise the requirement on a constrained parcel.
No access other than emergency access may run to or from a residential district.

Hamlet Center - Where the parcel abuts a residential district, the rear setback is 20 ft rather than 15 and the side yard on the abutting side is 20 ft. Total lot coverage is capped at 90% alongside the 75% building coverage cap.

Height is also capped at 2.5 stories.
On a parcel abutting the Taconic State Parkway or I-84, a 100 ft buffer applies to any structure, building or parking area, overriding any less restrictive yard requirement.
On a parcel abutting a state or county road outside the designated hamlet areas, buildings must be 100 ft from the edge of pavement, overriding any less restrictive yard requirement.
Where a property abuts a road never dedicated to the Town, county or state, 25 ft is added to the setback and it is measured from the centre line of the road.
Lot size, coverage and floor area ratio are subject to the Environmentally Sensitive Lands Law (§ 194-14.1), which can raise the requirement on a constrained parcel.
No access other than emergency access may run to or from a residential district.

Transitional - A 25 ft landscaped buffer is required from the road right-of-way into the property along every public roadway the lot touches, and it may count toward the front or side yard. Total lot coverage is capped at 35%.

The Planning Board sets the berming and heavy landscaping in the buffer.
Height is also capped at 2 stories.
On a parcel abutting the Taconic State Parkway or I-84, a 100 ft buffer applies to any structure, building or parking area, overriding any less restrictive yard requirement.
On a parcel abutting a state or county road outside the designated hamlet areas, buildings must be 100 ft from the edge of pavement, overriding any less restrictive yard requirement.
Lot size, coverage and floor area ratio are subject to the Environmentally Sensitive Lands Law (§ 194-14.1), which can raise the requirement on a constrained parcel.
No access other than emergency access may run to or from a residential district.

Light Industrial - Total lot coverage is capped at 75% alongside the 25% building coverage cap. The 10 ft minimum lot width is not confirmed; check it with the Town before relying on it.

Height is also capped at 2 stories.
On a parcel abutting the Taconic State Parkway or I-84, a 100 ft buffer applies to any structure, building or parking area, overriding any less restrictive yard requirement.
On a parcel abutting a state or county road outside the designated hamlet areas, buildings must be 100 ft from the edge of pavement, overriding any less restrictive yard requirement.
Where a property abuts a road never dedicated to the Town, county or state, 25 ft is added to the setback and it is measured from the centre line of the road.
Lot size, coverage and floor area ratio are subject to the Environmentally Sensitive Lands Law (§ 194-14.1), which can raise the requirement on a constrained parcel.
No access other than emergency access may run to or from a residential district.

Heavy Industrial - Total lot coverage is capped at 75% alongside the 25% building coverage cap, and height is also capped at 3 stories.

On a parcel abutting the Taconic State Parkway or I-84, a 100 ft buffer applies to any structure, building or parking area, overriding any less restrictive yard requirement.
On a parcel abutting a state or county road outside the designated hamlet areas, buildings must be 100 ft from the edge of pavement, overriding any less restrictive yard requirement.
Where a property abuts a road never dedicated to the Town, county or state, 25 ft is added to the setback and it is measured from the centre line of the road.
Lot size, coverage and floor area ratio are subject to the Environmentally Sensitive Lands Law (§ 194-14.1), which can raise the requirement on a constrained parcel.
No access other than emergency access may run to or from a residential district.

Light Industrial/Retail - Total lot coverage is capped at 65% alongside the 25% building coverage cap, and height is also capped at 2 stories.

On a parcel abutting the Taconic State Parkway or I-84, a 100 ft buffer applies to any structure, building or parking area, overriding any less restrictive yard requirement.
On a parcel abutting a state or county road outside the designated hamlet areas, buildings must be 100 ft from the edge of pavement, overriding any less restrictive yard requirement.
Where a property abuts a road never dedicated to the Town, county or state, 25 ft is added to the setback and it is measured from the centre line of the road.
Lot size, coverage and floor area ratio are subject to the Environmentally Sensitive Lands Law (§ 194-14.1), which can raise the requirement on a constrained parcel.
No access other than emergency access may run to or from a residential district.

ADUs vs. short-term rentals in East Fishkill

Short-term rentals allowed with local rules for Town of East Fishkill. Short-term rentals of 30 days or less are allowed only in single-family dwellings in certain residential districts, and are prohibited in R-1/2, R-1/3, R-1/4 and on non-conforming lots. Each needs annual registration with the Building Department and a $500 yearly fee. 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.

Good to know

Residential lot minimum0.16–3 ac — an ADU still has to fit the district's lot and setback envelope.
UtilityCentral Hudson territory.
Zoning codeecode360.com/7071722
Building dept(845) 221-2310

ADU FAQ — East Fishkill, NY

Are ADUs allowed in East Fishkill, NY?

Town of East Fishkill has 15 districts. 10 districts prohibit ADUs, 5 allow them with occupancy restrictions. Check your address with the free ADU checker, or confirm with the building department at (845) 221-2310.

Do I need a special permit for an ADU in East Fishkill?

No district in Town of East Fishkill requires a special-use permit for an ADU - 10 districts prohibit ADUs, 5 allow them with occupancy restrictions. Site-plan review or a building permit may still apply.

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

Short-term rentals allowed with local rules for Town of East Fishkill. 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 East Fishkill

Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $210k–275k 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 East Fishkill, priced by size.

How we know this

Sections analyzed: Ch. 194 Attachment 2 Schedule of Permitted Uses (amended 2-13-2025 by L.L. No. 1-2025); § 194-4; § 194-16; § 194-20; § 194-21; § 194-55.8 Estate cottage; § 194-87 Caretaker's apartments; § 194-91 Accessory residential units; Ch. 94 Elderly Cottage Housing
Districts confirmed: 15 of 15 — every mapped district.
Last reviewed: 2026-08-16
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 East Fishkill: Full zoning for new construction · ADU build cost · House build cost · ADU rules across Dutchess County · All Dutchess County towns

ADU information for Town of East Fishkill is compiled from the municipal code (last reviewed 2026-08-16) 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) 221-2310 before relying on any answer. Source: the Offsite / Aldo zoning dataset.