ADU · Rockland County
Can you build an ADU in Hillburn, NY?
Village of Hillburn has 8 districts. All districts prohibit ADUs. Check your address to confirm the district that applies to your parcel:
What the Hillburn 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 |
|---|---|---|---|---|
| Open Space (parks, playgrounds and utility rights-of-way; FAR 0.10) | 5.51 ac | 75 / 50 / 100 ft | 35 ft | No |
| Residence (one-family detached) | 1.38 ac | 50 / 40 / 75 ft | 35 ft | No |
| Residence (one-family detached) | 0.21 ac | 25 / 10 / 30 ft | 35 ft | No |
| Residence (one-family detached) | 0.14 ac | 25 / 10 / 30 ft | 35 ft | No |
| Local Shopping (base small-retail tier; Hillburn sets bulk PER USE — larger uses require up to 40,000 sf, see Table A) | 0.23 ac | 25 / 20 / 25 ft | 25 ft | No |
| General Commercial (base small-retail tier; Hillburn sets bulk PER USE — most uses require 40,000 sf, see Table A) | 0.23 ac | 25 / 20 / 25 ft | 25 ft | No |
| Regional Economic Development (base office/service tier; Hillburn sets bulk PER USE — hotels, conference and cultural centers require 80,000 sf, see Table A) | 0.46 ac | 25 / 20 / 25 ft | 25 ft | No |
| Light Industry (light industry by special use permit) | 0.92 ac | 35 / 50 / 50 ft | 25 ft | No |
ADUs vs. short-term rentals in Hillburn
Short-term rentals allowed with local rules for Village of Hillburn. Short-term rentals are named and regulated in the Village of Hillburn. § 250-7 of Zoning Chapter 250 defines SHORT-TERM RENTAL — expressly noting it is "also referred to as an 'Airbnb' and other such similar terms" — and Chapter 188, Rental Properties, adopted 5-9-2023 by Local Law No. 3-2023 and AMENDED IN ITS ENTIRETY 2-25-2025 by Local Law No. 3-2025, carries the rental permit requirement at § 188-8. Because Chapter 188 was rewritten in 2025, read the current text. 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 Hillburn at (845) 357-2036 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 minimum0.14–1.38 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityOrange & Rockland territory.
- Building dept(845) 357-2036
- Last reviewed2026-07-21
ADU FAQ — Hillburn, NY
Are ADUs allowed in Hillburn, NY?
Village of Hillburn has 8 districts. All districts prohibit ADUs. Check your address with the free ADU checker, or confirm with the building department at (845) 357-2036.
Do I need a special permit for an ADU in Hillburn?
No. No district in Village of Hillburn permits an ADU, so there is no permit to apply for. Codes change, so verify with the building department at (845) 357-2036 before ruling it out.
Can I use an ADU as a short-term rental in Hillburn?
Short-term rentals allowed with local rules for Village of Hillburn. 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 Hillburn
Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $225k–295k 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 Hillburn, priced by size.
More on Hillburn: Full zoning for new construction · ADU build cost · House build cost · All Rockland County towns
ADU information for Village of Hillburn is compiled from the municipal code (last reviewed 2026-07-21) 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) 357-2036 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.