ADU · Orange County
Can you build an ADU in Cornwall-on-Hudson, NY?
Village of Cornwall-on-Hudson has 4 districts. 2 districts prohibit ADUs, 2 allow them with occupancy restrictions. Check your address to confirm the district that applies to your parcel:
What the Cornwall-on-Hudson 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 |
|---|---|---|---|---|
| Conservation Residential | 0.918 ac | 50 / 20 / 50 ft | 35 ft | Occupancy restricted |
| Suburban Residential | 0.344 ac | 30 / 15 / 30 ft | 35 ft | Occupancy restricted |
| Waterfront Recreation | — | — | 35 ft | No |
| Industrial | 0.918 ac | 40 / 20 / 20 ft | 45 ft | No |
ADUs vs. short-term rentals in Cornwall-on-Hudson
Short-term rentals allowed with local rules for Village of Cornwall-on-Hudson. Village Short-Term Rentals chapter requires registration/permit, limits to owner-occupied dwellings, with a $250/day penalty for violations. 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 minimum0.344–0.918 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityCentral Hudson territory.
- Building dept(845) 534-4200
- Last reviewed2026-07-12
ADU FAQ — Cornwall-on-Hudson, NY
Are ADUs allowed in Cornwall-on-Hudson, NY?
Village of Cornwall-on-Hudson has 4 districts. 2 districts prohibit ADUs, 2 allow them with occupancy restrictions. Check your address with the free ADU checker, or confirm with the building department at (845) 534-4200.
Do I need a special permit for an ADU in Cornwall-on-Hudson?
No district in Village of Cornwall-on-Hudson requires a special-use permit for an ADU - 2 districts prohibit ADUs, 2 allow them with occupancy restrictions. Site-plan review or a building permit may still apply.
Can I use an ADU as a short-term rental in Cornwall-on-Hudson?
Short-term rentals allowed with local rules for Village of Cornwall-on-Hudson. 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 Cornwall-on-Hudson
Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $205k–270k 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 Cornwall-on-Hudson, priced by size.
More on Cornwall-on-Hudson: Full zoning for new construction · ADU build cost · House build cost · All Orange County towns
ADU information for Village of Cornwall-on-Hudson is compiled from the municipal code (last reviewed 2026-07-12) 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) 534-4200 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.