Hyde Park · ADU cost
What it costs to build an ADU in Hyde Park, NY
An 800 sq ft accessory dwelling unit in Hyde Park runs roughly $210k–275k, or about $263–345/sq ft, and that per-square-foot figure sits deliberately above the $215–282/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 town 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 Town of Hyde Park maps 12 districts that treat accessory units differently from one another, so read the table below as a starting point rather than a verdict.
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ADU cost by size in Hyde Park
Standard finish, slab on grade, on a flat and clear part of the lot, general-contractor margin included. These are structure costs at Dutchess County pricing, before the service and septic work a second dwelling can trigger.
| Size | Type | $ / sq ft | Estimated total |
|---|---|---|---|
| 400 sq ft | Studio | $349–$457 | $140k–185k |
| 600 sq ft | One bedroom | $292–$382 | $175k–230k |
| 800 sq ft | One bedroom, larger | $263–$345 | $210k–275k |
| 1,000 sq ft | Two bedroom | $246–$322 | $245k–320k |
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 | $8–$12 | $8 | — |
| Foundation | $17–$24 | $17 | — |
| Framing | $27–$34 | $27 | — |
| Envelope - roof, siding, windows | $34–$43 | $34 | — |
| Plumbing | $29–$36 | $17 | 55% |
| Electrical | $19–$25 | $13 | 35% |
| HVAC | $24–$30 | $15 | 45% |
| Insulation | $8–$10 | $8 | — |
| Interior finishes | $34–$46 | $29 | 15% |
| Millwork & cabinetry | $19–$29 | $12 | 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 Hyde Park 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 |
|---|---|---|---|---|
| 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).
Size limits on record in Hyde Park
Where the code states a size cap, it decides which row of the cost table above actually applies to you. These are the caps recorded for Hyde Park:
- GreenbeltThe 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.
- WaterfrontThe 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.
- NeighborhoodThe 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.
- Neighborhood CoreThe 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.
- HamletThe 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.
- Hamlet CoreThe 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.
- Crossroads CoreThe 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.
- LandingThe 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.
- East Park Business DistrictThe 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.
- Neighborhood Business DistrictThe 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.
- Corridor Business DistrictThe 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.
- Town Core DistrictThe 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.
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 Central Hudson 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. 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. Separate question from whether you can build the unit.
- Zoning codeecode360.com/9155152
- Building dept(845) 229-5111
Sizing up a specific parcel in Hyde Park?
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Building a full house instead?
A standard-finish house in Hyde Park runs $215–282/sq ft, about $390k–510k at 1,800 sq ft . See what it costs to build a house in Hyde Park.
ADU cost in nearby towns
All Dutchess County towns: Beacon (City) · Poughkeepsie (City) · Amenia · Beekman · Clinton · Dover · East Fishkill · Fishkill · La Grange · Milan · North East · Pawling · Pine Plains · Pleasant Valley · Poughkeepsie · Red Hook · Rhinebeck · Stanford · Union Vale · Wappinger · Washington · Fishkill (Village) · Millbrook (Village) · Millerton (Village) · Pawling (Village) · Red Hook (Village) · Rhinebeck (Village) · Tivoli (Village) · Wappingers Falls (Village)
More on Hyde Park: Can you build an ADU here? · Zoning for new construction · Dutchess County build cost
ADU cost in Hyde Park: common questions
How much does it cost to build an ADU in Hyde Park, NY?
An 800 sq ft accessory dwelling unit in Town of Hyde Park runs roughly $210k–275k at a standard finish, general-contractor margin included. A 400 sq ft studio runs about $140k–185k. 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 Hyde Park?
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 $263–345/sq ft against $215–282/sq ft for a full house, even though it is the same trades doing the same work.
Are ADUs allowed in Hyde Park?
Town of Hyde Park has 12 districts. All districts allow ADUs with a special-use permit. Check the specific address with the free ADU checker or confirm with the building department at (845) 229-5111 before you spend money on design.
Can I rent an ADU in Hyde Park short term?
No local short-term-rental law on record - which is not the same as permission for Town of Hyde Park. 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 Dutchess 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 Town of Hyde Park vary by district and often carry exceptions this page does not show; zoning last reviewed 2026-08-16; verify with the building department at (845) 229-5111 before relying on any answer. Sources: the Offsite / Aldo cost engine and zoning dataset.