ADU · Westchester County
Can you build an ADU in Ossining, NY?
Village of Ossining has 23 districts. All districts prohibit ADUs. Check your address to confirm the district that applies to your parcel:
What the Ossining 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 Development District | 2 ac | — | 48 ft | No |
| Planned Residence District | — | — | — | No |
| One-Family Residence | 0.2296 ac | — | 35 ft | No |
| One-Family Residence | 0.3444 ac | — | 35 ft | No |
| One-Family Residence | 0.1148 ac | — | 35 ft | No |
| One-Family Residence | 0.1722 ac | — | 35 ft | No |
| Two-Family Residence | 0.1722 ac | — | 35 ft | No |
| Multi-Family Residence | 0.9183 ac | — | 35 ft | No |
| Riverfront Development District | 0.9183 ac | — | 36 ft | No |
| Institutional Redevelopment | 5 ac | — | 48 ft | No |
| Multi-Family Residence | 0.9183 ac | — | 35 ft | No |
| Northern Waterfront | 0.9183 ac | — | 72 ft | No |
| Central Waterfront - Transit | 0.9183 ac | — | 48 ft | No |
| Central Waterfront - Hillside | 0.2296 ac | — | 48 ft | No |
| Office Research | — | — | — | No |
| General Business | — | — | 35 ft | No |
| Neighborhood Center | — | — | — | No |
| Neighborhood Center | — | — | 35 ft | No |
| Professional Office | — | — | 35 ft | No |
| Planned Center | — | — | — | No |
| Station Plaza South | — | — | — | No |
| Station Plaza North | — | — | — | No |
| Village Center | — | — | 50 ft | No |
ADUs vs. short-term rentals in Ossining
No local short-term-rental law on record - which is not the same as permission for Village of Ossining. L.L. No. 8-2024 (Chapter 205: Rental Registry, adopted Jul 17, 2024) requires all rental property owners to register with the Building Department, but is a general landlord registration law — no STR-specific permit requirement or ordinance found in the village code as of Jun 2026. 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 minimum0.1148–0.9183 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityCon Edison territory.
- Building dept(914) 941-3199
- Last reviewed2026-06-15
ADU FAQ — Ossining, NY
Are ADUs allowed in Ossining, NY?
Village of Ossining has 23 districts. All districts prohibit ADUs. Check your address with the free ADU checker, or confirm with the building department at (914) 941-3199.
Do I need a special permit for an ADU in Ossining?
No. No district in Village of Ossining permits an ADU, so there is no permit to apply for. Codes change, so verify with the building department at (914) 941-3199 before ruling it out.
Can I use an ADU as a short-term rental in Ossining?
No local short-term-rental law on record - which is not the same as permission for Village of Ossining. 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 Ossining
Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $235k–310k 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 Ossining, priced by size.
More on Ossining: Full zoning for new construction · ADU build cost · House build cost · All Westchester County towns
ADU information for Village of Ossining is compiled from the municipal code (last reviewed 2026-06-15) 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 (914) 941-3199 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.