ADU · Dutchess County
Can you build an ADU in Millbrook, NY?
Village of Millbrook has 8 districts. All districts allow ADUs with a special-use permit. Check your address to confirm the district that applies to your parcel:
What the Millbrook 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 |
|---|---|---|---|---|
| Rural | 5 ac | 75 / 50 / 50 ft | 35 ft | Special permit |
| Residential Low-Density | 2 ac | 50 / 25 / 30 ft | 35 ft | Special permit |
| Residential Transitional | 1.5 ac | 50 / 30 / 30 ft | 35 ft | Special permit |
| Residential - One Acre | 1 ac | 35 / 20 / 30 ft | 35 ft | Special permit |
| Residential | 0.3333 ac | 25 / 10 / 30 ft | 35 ft | Special permit |
| Multifamily Residential | 0.2296 ac | 30 / 15 / 30 ft | 35 ft | Special permit |
| Bennett Campus District | 2 ac | 50 / 30 / 30 ft | 35 ft | Special permit |
| General Business | 0.0918 ac | 10 / 0 / 15 ft | 35 ft | Special permit |
Rural, Residential Low-Density, Residential Transitional, Residential - One Acre, Residential, Multifamily Residential — Lot depth is a published requirement of its own: a lot can meet the area and the width and still fail on depth. Height is capped at 2 1/2 stories as well as 35 ft.
Bennett Campus District — Lot depth is a published requirement of its own: a lot can meet the area and the width and still fail on depth. Height is capped at 2 1/2 stories as well as 35 ft. Two-acre single-family zoning is as-of-right in BCD. The Schedule of Lot and Bulk Requirements also carries a CDD row, which is NOT a mapped district: a Conservation Density Development is a planned unit development inside the BCD, available only by special use permit, and it is recorded here as a variant rather than as a district of its own.
General Business — Lot depth is a published requirement of its own: a lot can meet the area and the width and still fail on depth. Height is capped at 2 1/2 stories as well as 35 ft. The schedule prints "--" in the side yard column, an affirmative "none required" rather than a blank, so no side yard is needed in General Business.
ADUs vs. short-term rentals in Millbrook
Short-term rentals allowed with local rules for Village of Millbrook. Short-term rentals are regulated as overnight accommodations. § 230-30C(2) of Zoning Chapter 230 sits under § 230-30, Overnight accommodations, and defines SHORT-TERM RENTAL along with HOSTED SHORT-TERM RENTAL and NONHOSTED SHORT-TERM RENTAL — a hosted/unhosted split that almost always carries different permissions, so establish which form a property would be before relying on any single answer. New York State's 2025 short-term rental registry (Ch. 99 of the Laws of 2025) separately requires every host statewide to register the unit regardless of local law. Confirm with Village of Millbrook at (845) 677-8419 before listing. 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 minimum0.2296–5 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityCentral Hudson territory.
- Zoning codeecode360.com/10855096
- Building dept(845) 677-8419
- Last reviewed2026-08-16
ADU FAQ — Millbrook, NY
Are ADUs allowed in Millbrook, NY?
Village of Millbrook has 8 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) 677-8419.
Do I need a special permit for an ADU in Millbrook?
Yes. Every district in Village of Millbrook 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 Millbrook?
Short-term rentals allowed with local rules for Village of Millbrook. 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.
What an ADU costs to build in Millbrook
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 Millbrook, priced by size.
More on Millbrook: Full zoning for new construction · ADU build cost · House build cost · All Dutchess County towns
ADU information for Village of Millbrook 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) 677-8419 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.