ADU · Dutchess County

Can you build an ADU in Wappinger, NY?

Town of Wappinger has 20 districts. 12 districts allow ADUs with occupancy restrictions, 8 do not. Check your address to confirm the district that applies to your parcel:

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What the Wappinger code says

An accessory apartment is permitted in R-5A, R-3A, R-80, R-40/80, R-40, R-20/40, R-20, R-15, R-10 and HM, and in RMF-3 and RMF-5 only with a one-family dwelling. It is not permitted in HD, NB, GB, SC, HB, CC, COP or AI.

Conditions the code attaches:

The apartment must be inside a detached one-family dwelling that has stood at least five years, one per lot, with a side or rear entrance and a yearly inspection to renew the approval.
The owner must live in one unit, and an occupant of one unit must be a parent, child, sibling, grandparent, grandchild or parent-in-law of an occupant of the other.
If the relative leaves, a lot of at least 80,000 sq ft may take a nonfamily occupant aged 55 or over.
At least 300 sq ft, at most 35% of the house's gross floor area and never over 1,000 sq ft, with no more than three occupants.
The certificate ends on a change in ownership or in the owner's residence, and 60 days after a change in the family relationship; a new owner who cannot continue has 60 days to take out the kitchen.
In every residential district a lot of at least 10 acres may take a guest cottage or caretaker dwelling of 800 sq ft up to 60% of the house or 1,800 sq ft, by special permit.

How big an ADU can be in Wappinger

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 300 sq ft, and no more than 35% of the principal dwelling, or 1,000 sq ft of gross floor area — whichever is smaller

R-5A, R-3A, R-80, R-40/80, R-40, R-20/40, R-20, R-15, R-10, RMF-3, RMF-5, HM · owner-occupancy required · § 240-53B(2), (4), (5)

What the Wappinger 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
1-Family Residence 5-Acre	5 ac	100 / 50 / 100 ft	35 ft	Occupancy restricted
1-Family Residence 3-Acre	3 ac	75 / 50 / 50 ft	35 ft	Occupancy restricted
1-Family Residence 80,000 Square Feet	1.84 ac	50 / 40 / 50 ft	35 ft	Occupancy restricted
1-Family Residence 40,000/80,000 Square Feet	1.84 ac	50 / 40 / 50 ft	35 ft	Occupancy restricted
1-Family Residence 40,000 Square Feet	0.92 ac	50 / 25 / 50 ft	35 ft	Occupancy restricted
1-Family Residence 20,000/40,000 Square Feet	0.92 ac	50 / 25 / 50 ft	35 ft	Occupancy restricted
1-Family Residence 20,000 Square Feet	0.46 ac	35 / 20 / 40 ft	35 ft	Occupancy restricted
1-Family Residence 15,000 Square Feet	0.34 ac	35 / 15 / 30 ft	35 ft	Occupancy restricted
1-Family Residence 10,000 Square Feet	0.23 ac	25 / 12 / 25 ft	35 ft	Occupancy restricted
Multifamily Residence 3	15 ac	50 / 50 / 50 ft	35 ft	Occupancy restricted
Multifamily Residence 5	10 ac	50 / 25 / 50 ft	35 ft	Occupancy restricted
Highway Design	2 ac	50 / 10 / 30 ft	35 ft	No
Neighborhood Business	—	25 / 20 / 30 ft	35 ft	No
General Business	0.34 ac	25 / 20 / 30 ft	35 ft	No
Shopping Center	5 ac	100 / 50 / 50 ft	35 ft	No
Highway Business	2 ac	50 / 10 / 30 ft	35 ft	No
Conservation Commercial	1 ac	50 / 10 / 30 ft	35 ft	No
Conservation Office Park	5 ac	100 / 50 / 50 ft	35 ft	No
Hamlet Mixed Use	—	15 / 12 / 25 ft	35 ft	Occupancy restricted
Airport Industry	2 ac	100 / 50 / 50 ft	35 ft	No

1-Family Residence 5-Acre - The lot also needs at least 50 ft of street frontage, a requirement separate from the width and depth shown. Height is capped at 2 1/2 stories as well as 35 ft.

The 100 ft front yard applies on a county or state highway as on any other street.
An accessory building under 15 ft high and under 144 sq ft may stand 20 ft from a side lot line and 20 ft from the rear.

1-Family Residence 3-Acre - The lot also needs at least 50 ft of street frontage, a requirement separate from the width and depth shown. Height is capped at 2 1/2 stories as well as 35 ft.

The 75 ft front yard applies on a county or state highway as on any other street.
An accessory building under 15 ft high and under 144 sq ft may stand 20 ft from a side lot line and 20 ft from the rear.

1-Family Residence 80,000 Square Feet, 1-Family Residence 40,000 Square Feet - On a county or state highway the front yard is 75 ft rather than 50 ft, but an existing dwelling and any addition to or expansion of one keep the 50 ft figure. The lot also needs at least 50 ft of street frontage, separate from the width and depth.

Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 10 ft from a side lot line and 10 ft from the rear.

1-Family Residence 40,000/80,000 Square Feet - The figures shown are for a lot without public water and sewer, at 80,000 sq ft. With public water and sewer the lot drops to 40,000 sq ft, and with one or the other to 60,000 sq ft, and the width, depth and yards step down with it.

On a county or state highway the front yard is 75 ft rather than 50 ft, but an existing dwelling and any addition to or expansion of one keep the 50 ft figure.
The lot also needs at least 50 ft of street frontage, separate from the width and depth.
Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 10 ft from a side lot line and 10 ft from the rear.

1-Family Residence 20,000/40,000 Square Feet - The figures shown are for a lot without public water and sewer, at 40,000 sq ft. With public water and sewer the lot drops to 20,000 sq ft, and with one or the other to 30,000 sq ft, and the width, depth and yards step down with it.

On a county or state highway the front yard is 75 ft rather than 50 ft, but an existing dwelling and any addition to or expansion of one keep the 50 ft figure.
The lot also needs at least 50 ft of street frontage, separate from the width and depth.
Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 10 ft from a side lot line and 10 ft from the rear.

1-Family Residence 20,000 Square Feet - On a county or state highway the front yard is 75 ft rather than 35 ft, but an existing dwelling and any addition to or expansion of one keep the 35 ft figure. The lot also needs at least 50 ft of street frontage, separate from the width and depth.

Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 10 ft from a side lot line and 10 ft from the rear.

1-Family Residence 15,000 Square Feet - On a county or state highway the front yard is 75 ft rather than 35 ft, but an existing dwelling and any addition to or expansion of one keep the 35 ft figure. The lot also needs at least 50 ft of street frontage, separate from the width and depth.

Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 6 ft from a side lot line and 10 ft from the rear.

1-Family Residence 10,000 Square Feet - On a county or state highway the front yard is 75 ft rather than 25 ft, but an existing dwelling and any addition to or expansion of one keep the 25 ft figure. The lot also needs at least 50 ft of street frontage, separate from the width and depth.

Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 6 ft from a side lot line and 10 ft from the rear.

Multifamily Residence 3 - The 15 acre minimum drops to 5 acres with public water and sewer, but stays at 15 acres with only one of the two. Density is capped at 3 dwelling units per net lot area.

On a county or state highway the front yard is 75 ft rather than 50 ft, but an existing dwelling and any addition to or expansion of one keep the 50 ft figure.
The lot also needs at least 50 ft of street frontage, separate from the width and depth.
Height is capped at 3 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 10 ft from a side lot line and 10 ft from the rear.

Multifamily Residence 5 - The 10 acre minimum drops to 5 acres with public water and sewer, but stays at 10 acres with only one of the two. Density is capped at 5 dwelling units per net lot area.

On a county or state highway the front yard is 75 ft rather than 50 ft, but an existing dwelling and any addition to or expansion of one keep the 50 ft figure.
The lot also needs at least 50 ft of street frontage, separate from the width and depth.
Height is capped at 3 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 10 ft from a side lot line and 10 ft from the rear.

Highway Design, Highway Business - Besides the 25% building coverage, impervious surface is capped at 75% and at least 25% of the lot must stay landscaped open space.

On a county or state highway the front yard is 75 ft rather than 50 ft, but an existing dwelling and any addition to or expansion of one keep the 50 ft figure.
The lot also needs at least 150 ft of street frontage, separate from the width and depth.
Where the lot abuts land in a residential district, the more restrictive side and rear yard of the two districts governs.
Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 10 ft from a side lot line and 30 ft from the rear.

Neighborhood Business - Besides the 20% building coverage, impervious surface is capped at 75% and at least 25% of the lot must stay landscaped open space.

On a county or state highway the front yard is 75 ft rather than 25 ft, but an existing dwelling and any addition to or expansion of one keep the 25 ft figure.
The lot also needs at least 100 ft of street frontage, separate from the width and depth.
Where the lot abuts land in a residential district, the more restrictive side and rear yard of the two districts governs.
Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 20 ft from a side lot line and 30 ft from the rear.

General Business - Besides the 25% building coverage, impervious surface is capped at 75% and at least 25% of the lot must stay landscaped open space.

On a county or state highway the front yard is 75 ft rather than 25 ft, but an existing dwelling and any addition to or expansion of one keep the 25 ft figure.
The lot also needs at least 100 ft of street frontage, separate from the width and depth.
Where the lot abuts land in a residential district, the more restrictive side and rear yard of the two districts governs.
Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 20 ft from a side lot line and 30 ft from the rear.

Shopping Center - Besides the 20% building coverage, impervious surface is capped at 75% and at least 25% of the lot must stay landscaped open space.

The lot also needs at least 300 ft of street frontage, separate from the width and depth.
Where the lot abuts land in a residential district, the more restrictive side and rear yard of the two districts governs.
Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 50 ft from a side lot line and 50 ft from the rear.

Conservation Commercial - Besides the 20% building coverage, impervious surface is capped at 40% and at least 60% of the lot must stay landscaped open space.

Parking has its own setbacks: 20 ft from the front lot line and 10 ft from a side or rear lot line.
On a county or state highway the front yard is 75 ft rather than 50 ft, but an existing dwelling and any addition to or expansion of one keep the 50 ft figure.
The lot also needs at least 100 ft of street frontage, separate from the width and depth.
Where the lot abuts land in a residential district, the more restrictive side and rear yard of the two districts governs.
Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 10 ft from a side lot line and 30 ft from the rear.

Conservation Office Park - Besides the 15% building coverage, impervious surface is capped at 40% and at least 60% of the lot must stay landscaped open space.

The lot also needs at least 300 ft of street frontage, separate from the width and depth.
Where the lot abuts land in a residential district, the more restrictive side and rear yard of the two districts governs.
Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 50 ft from a side lot line and 50 ft from the rear.

Hamlet Mixed Use - There is no flat minimum lot size: each one-family dwelling unit needs 25,000 sq ft of lot area, or 10,000 sq ft where the lot is served by a central sewer consistent with the town water and sewer management plan.

Besides the 25% building coverage, impervious surface is capped at 50% and at least 50% of the lot must stay landscaped open space.
On a county or state highway the front yard is 75 ft rather than 15 ft, but an existing dwelling and any addition to or expansion of one keep the 15 ft figure.
The lot also needs at least 50 ft of street frontage, separate from the width and depth.
Where the lot abuts land in a residential district, the more restrictive side and rear yard of the two districts governs.
An accessory building under 15 ft high and under 144 sq ft may stand 5 ft from a side lot line and 5 ft from the rear.
Height is capped at 2 1/2 stories as well as 35 ft.

Airport Industry - Besides the 20% building coverage, impervious surface is capped at 75% and at least 25% of the lot must stay landscaped open space.

The lot also needs at least 150 ft of street frontage, separate from the width and depth.
Where the lot abuts land in a residential district, the more restrictive side and rear yard of the two districts governs.
Height is capped at 2 1/2 stories as well as 35 ft.
An accessory building under 15 ft high and under 144 sq ft may stand 50 ft from a side lot line and 50 ft from the rear.

ADUs vs. short-term rentals in Wappinger

Short-term rentals allowed with local rules for Town of Wappinger. Short-term rentals are regulated in the residential districts R-40, R-40/80, R-80, R-3A and R-5A, and need a building permit. 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 minimum0.23–15 ac — an ADU still has to fit the district's lot and setback envelope.
UtilityCentral Hudson territory.
Zoning codeecode360.com/11073974
Building dept(845) 297-4158

ADU FAQ — Wappinger, NY

Are ADUs allowed in Wappinger, NY?

Town of Wappinger has 20 districts. 12 districts allow ADUs with occupancy restrictions, 8 do not. Check your address with the free ADU checker, or confirm with the building department at (845) 297-4158.

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

No district in Town of Wappinger requires a special-use permit for an ADU - 12 districts allow ADUs with occupancy restrictions, 8 do not. Site-plan review or a building permit may still apply.

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

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

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 Wappinger, priced by size.

How we know this

Sections analyzed: Ch. 240 Attachment 1 and Attachment 2 Schedules of Use Regulations; § 240-5; § 240-53 Accessory apartments; § 240-60; § 240-61 Guest cottages and caretaker dwellings
Districts confirmed: 20 of 20 — 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 Wappinger: 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 Wappinger 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) 297-4158 before relying on any answer. Source: the Offsite / Aldo zoning dataset.