ADU · Dutchess County

Can you build an ADU in Hyde Park, NY?

Town of Hyde Park has 12 districts. All districts allow ADUs with a special-use permit. Check your address to confirm the district that applies to your parcel:

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What the Hyde Park code says

An accessory apartment, inside a one-family house or in an outbuilding on its lot, needs a special use permit in every district, and the owner must live in one of the units. It can be at most 35% of the house's floor area, with no more than two bedrooms.

Conditions the code attaches:

The apartment must be larger than 400 sq ft and no more than 35% of the house's gross floor area as it stood before the apartment was added.
No more than two bedrooms, and the apartment counts toward the lot's density.
The County Health Department has to find that the water supply and septic can handle the added demand.
An apartment in a detached building also needs site plan approval and must meet the bulk rules for that building.

How big an ADU can be in Hyde Park

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

35% of the principal dwelling

GB, WF, N, NC, H, HC, CC, L, EPBD, NBD, CB, TC · owner-occupancy required · § 108-8.4B(1), (2)

What the Hyde Park 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
Greenbelt	—	50 / 25 / 50 ft	35 ft	Special permit
Waterfront	—	50 / 25 / 50 ft	35 ft	Special permit
Neighborhood	—	50 / 20 / 30 ft	35 ft	Special permit
Neighborhood Core	—	30 / 15 / 30 ft	35 ft	Special permit
Hamlet	—	20 / 10 / 30 ft	35 ft	Special permit
Hamlet Core	—	10 / 10 / 30 ft	40 ft	Special permit
Crossroads Core	—	10 / 10 / 25 ft	40 ft	Special permit
Landing	—	10 / 10 / 10 ft	35 ft	Special permit
East Park Business District	—	20 / 10 / 20 ft	40 ft	Special permit
Neighborhood Business District	—	20 / 10 / 20 ft	40 ft	Special permit
Corridor Business District	—	10 / 5 / 20 ft	40 ft	Special permit
Town Core District	—	—	—	Special permit

Greenbelt, Waterfront - Each dwelling unit needs at least 2.5 acres on average, or 2.0 acres where 10 acres or less remain, after Army Corps and DEC regulated wetlands and the one-hundred-year flood hazard area are deducted. The 15% coverage cap counts all impervious surface, buildings included.

The code sets no minimum lot area. Density is an average across a parcel and does not by itself make a smaller lot unlawful.
No building permit issues for a lot with less than 25 ft of frontage on a street, and none at all below 15 ft without a variance (§ 108-4.4E).
On a corner lot, the side yard facing the side street must equal the front yard depth.
Accessory structures are capped at 22 ft in height. One 15 ft or lower needs the full front setback but only half the side and rear setbacks, never under 5 ft, unless it contains a dwelling unit.
Every dwelling unit needs a least dimension of 16 ft.
For a solar farm approved under § 130-8, the impervious coverage limit is 25% rather than 15%.

Neighborhood - The code sets no minimum lot area; density is capped at an average of 2 dwelling units per acre across a parcel, which does not by itself make a smaller lot unlawful. The 50% coverage cap counts all impervious surface, buildings included.

No building permit issues for a lot with less than 25 ft of frontage on a street, and none at all below 15 ft without a variance (§ 108-4.4E).
On a corner lot, the side yard facing the side street must equal the front yard depth.
Accessory structures are capped at 22 ft in height. One 15 ft or lower needs the full front setback but only half the side and rear setbacks, never under 5 ft, unless it contains a dwelling unit.
Every dwelling unit needs a least dimension of 16 ft.

Neighborhood Core - The code sets no minimum lot area; density is capped at an average of 4 dwelling units per acre across a parcel, which does not by itself make a smaller lot unlawful. The 70% coverage cap counts all impervious surface, buildings included.

The gross floor area of any one use or structure is capped at 6,000 sq ft, except one- and two-family dwellings, animal husbandry and agriculture.
No building permit issues for a lot with less than 25 ft of frontage on a street, and none at all below 15 ft without a variance (§ 108-4.4E).
On a corner lot, the side yard facing the side street must equal the front yard depth.
Accessory structures are capped at 22 ft in height. One 15 ft or lower needs the full front setback but only half the side and rear setbacks, never under 5 ft, unless it contains a dwelling unit.
Every dwelling unit needs a least dimension of 16 ft.

Hamlet - The code sets no minimum lot area; density is capped at an average of 4 dwelling units per acre across a parcel, which does not by itself make a smaller lot unlawful. The 60% coverage cap counts all impervious surface, buildings included.

No building permit issues for a lot with less than 25 ft of frontage on a street, and none at all below 15 ft without a variance (§ 108-4.4E).
On a corner lot, the side yard facing the side street must equal the front yard depth.
Accessory structures are capped at 22 ft in height. One 15 ft or lower needs the full front setback but only half the side and rear setbacks, never under 5 ft, unless it contains a dwelling unit.
Every dwelling unit needs a least dimension of 16 ft.

Hamlet Core - The code sets no minimum lot area; density is capped at an average of 6 dwelling units per acre across a parcel, which does not by itself make a smaller lot unlawful. The 80% coverage cap counts all impervious surface, buildings included.

No building permit issues for a lot with less than 25 ft of frontage on a street, and none at all below 15 ft without a variance (§ 108-4.4E).
On a corner lot, the side yard facing the side street must equal the front yard depth.
Accessory structures are capped at 22 ft in height. One 15 ft or lower needs the full front setback but only half the side and rear setbacks, never under 5 ft, unless it contains a dwelling unit.
Every dwelling unit needs a least dimension of 16 ft.

Crossroads Core - The code sets no minimum lot area; density is capped at an average of 10 dwelling units per acre across a parcel, which does not by itself make a smaller lot unlawful. The 85% coverage cap counts all impervious surface, buildings included.

The front and side yards may both be reduced to zero subject to the Crossroads Core standards.
No building permit issues for a lot with less than 25 ft of frontage on a street, and none at all below 15 ft without a variance (§ 108-4.4E).
On a corner lot, the side yard facing the side street must equal the front yard depth.
Accessory structures are capped at 22 ft in height. One 15 ft or lower needs the full front setback but only half the side and rear setbacks, never under 5 ft, unless it contains a dwelling unit.
Every dwelling unit needs a least dimension of 16 ft.

Landing - The code sets no minimum lot area; density is capped at an average of 10 dwelling units per acre across a parcel, which does not by itself make a smaller lot unlawful. The 90% coverage cap counts all impervious surface, buildings included.

A lot fronting on the Hudson River may build water-dependent structures into the river with U.S. Army Corps of Engineers approval.
No building permit issues for a lot with less than 25 ft of frontage on a street, and none at all below 15 ft without a variance (§ 108-4.4E).
On a corner lot, the side yard facing the side street must equal the front yard depth.
Accessory structures are capped at 22 ft in height. One 15 ft or lower needs the full front setback but only half the side and rear setbacks, never under 5 ft, unless it contains a dwelling unit.
Every dwelling unit needs a least dimension of 16 ft.

East Park Business District - The code sets no minimum lot area; density is capped at an average of 8 dwelling units per acre across a parcel, which does not by itself make a smaller lot unlawful. The 70% coverage cap counts all impervious surface, buildings included.

The gross floor area of any one use or structure is capped at 40,000 sq ft, except one- and two-family dwellings, animal husbandry and agriculture.
No building permit issues for a lot with less than 25 ft of frontage on a street, and none at all below 15 ft without a variance (§ 108-4.4E).
On a corner lot, the side yard facing the side street must equal the front yard depth.
Accessory structures are capped at 22 ft in height. One 15 ft or lower needs the full front setback but only half the side and rear setbacks, never under 5 ft, unless it contains a dwelling unit.
Every dwelling unit needs a least dimension of 16 ft.

Neighborhood Business District - The code sets no minimum lot area; density is capped at an average of 8 dwelling units per acre across a parcel, which does not by itself make a smaller lot unlawful. The 70% coverage cap counts all impervious surface, buildings included.

The gross floor area of any one use or structure is capped at 7,500 sq ft, except one- and two-family dwellings, animal husbandry and agriculture.
No building permit issues for a lot with less than 25 ft of frontage on a street, and none at all below 15 ft without a variance (§ 108-4.4E).
On a corner lot, the side yard facing the side street must equal the front yard depth.
Accessory structures are capped at 22 ft in height. One 15 ft or lower needs the full front setback but only half the side and rear setbacks, never under 5 ft, unless it contains a dwelling unit.
Every dwelling unit needs a least dimension of 16 ft.

Corridor Business District - The code sets no minimum lot area; density is capped at an average of 8 dwelling units per acre across a parcel, which does not by itself make a smaller lot unlawful. The 85% coverage cap counts all impervious surface, buildings included.

The gross floor area of any one use or structure is capped at 65,000 sq ft, except one- and two-family dwellings, animal husbandry and agriculture.
No building permit issues for a lot with less than 25 ft of frontage on a street, and none at all below 15 ft without a variance (§ 108-4.4E).
On a corner lot, the side yard facing the side street must equal the front yard depth.
Accessory structures are capped at 22 ft in height. One 15 ft or lower needs the full front setback but only half the side and rear setbacks, never under 5 ft, unless it contains a dwelling unit.
Every dwelling unit needs a least dimension of 16 ft.

Town Core District - Bulk rules for TC are set in the Town Core Design and Development Standards, not in the zoning chapter. Where the Planning Board has approved a building type waiver permit, the CB standards apply instead.

Under a building type waiver permit, the limits are 40 ft of height, 85% impervious coverage, and 10 ft front, 5 ft side and 20 ft rear yards.
A lot needs at least 25 ft of street frontage (§ 108-4.4E).

ADUs vs. short-term rentals in Hyde Park

No local short-term-rental law on record - which is not the same as permission for Town of Hyde Park. The Town of Hyde Park has no local short-term rental law as of Jun 2026, which is not the same as permission. Confirm with the Town of Hyde Park Building Department before counting on short-term rental income. 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

UtilityCentral Hudson territory.
Zoning codeecode360.com/9155152
Building dept(845) 229-5111

ADU FAQ — Hyde Park, NY

Are ADUs allowed in Hyde Park, NY?

Town of Hyde Park has 12 districts. All districts allow ADUs with a special-use permit. Check your address with the free ADU checker, or confirm with the building department at (845) 229-5111.

Do I need a special permit for an ADU in Hyde Park?

Yes. Every district in Town of Hyde Park requires a special-use permit for an ADU rather than allowing one as of right. Check the conditions attached to it before you design.

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

No local short-term-rental law on record - which is not the same as permission for Town of Hyde Park. 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 Hyde Park

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 Hyde Park, priced by size.

How we know this

Sections analyzed: Ch. 108 Attachment 1 Schedule of Use Regulations (amended through L.L. No. 4-2025), row "Apartment, accessory"; § 108-8.4 Standards, accessory apartments; § 108-2.2 definition "Apartment, accessory"
Districts confirmed: 12 of 12 — 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 Hyde Park: 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 Hyde Park 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) 229-5111 before relying on any answer. Source: the Offsite / Aldo zoning dataset.