ADU · Westchester County
Can you build an ADU in Mount Kisco, NY?
Village of Mount Kisco has 24 districts. All districts prohibit ADUs. Check your address to confirm the district that applies to your parcel:
What the Mount Kisco 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 | 2 ac | — | 35 ft | No |
| Planned Residential Development | 0.5165 ac | — | 35 ft | No |
| Moderate Density Multi-Family Cluster | 0.1435 ac | — | 35 ft | No |
| Medium Density Multi-Family Cluster | 0.1435 ac | — | 35 ft | No |
| High Density Multi-Family Residence | 0.1435 ac | — | 35 ft | No |
| Low Density Single Family Residence | 0.287 ac | — | 35 ft | No |
| Medium Density Single Family Residence | 0.1435 ac | — | 35 ft | No |
| Moderate Density Single Family Residence | 0.2152 ac | — | 35 ft | No |
| One and Two Family Residence | 0.1435 ac | — | 35 ft | No |
| Central Business | — | — | 40 ft | No |
| Central Business | — | — | 40 ft | No |
| Limited Commercial | 0.2296 ac | — | 35 ft | No |
| Neighborhood Commercial | 0.1607 ac | — | 35 ft | No |
| General Commercial | 0.9183 ac | — | 40 ft | No |
| General Retail | 0.2296 ac | — | 30 ft | No |
| Cottage Office | 0.1435 ac | — | 35 ft | No |
| Low Intensity Office | 0.2296 ac | — | 35 ft | No |
| General Office | 0.4591 ac | — | 40 ft | No |
| Research and Development | 0.9183 ac | — | 40 ft | No |
| Light Manufacturing | 0.2296 ac | — | 35 ft | No |
| Service Commercial | 0.2296 ac | — | 35 ft | No |
| Hospital | 0.0717 ac | — | 35 ft | No |
| Preservation Development | 25 ac | — | 25 ft | No |
| Recreational | 0.2296 ac | — | 30 ft | No |
ADUs vs. short-term rentals in Mount Kisco
No local short-term-rental law on record - which is not the same as permission for Village of Mount Kisco. No local STR ordinance found as of Jun 2026; standard village/town zoning and building codes apply. Westchester County hotel occupancy tax (3%) applies to short-term stays. 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 minimum0.1435–0.5165 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityCon Edison territory.
- Building dept(914) 864-0019
- Last reviewed2026-06-08
ADU FAQ — Mount Kisco, NY
Are ADUs allowed in Mount Kisco, NY?
Village of Mount Kisco has 24 districts. All districts prohibit ADUs. Check your address with the free ADU checker, or confirm with the building department at (914) 864-0019.
Do I need a special permit for an ADU in Mount Kisco?
No. No district in Village of Mount Kisco permits an ADU, so there is no permit to apply for. Codes change, so verify with the building department at (914) 864-0019 before ruling it out.
Can I use an ADU as a short-term rental in Mount Kisco?
No local short-term-rental law on record - which is not the same as permission for Village of Mount Kisco. 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 Mount Kisco
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 Mount Kisco, priced by size.
More on Mount Kisco: Full zoning for new construction · ADU build cost · House build cost · All Westchester County towns
ADU information for Village of Mount Kisco is compiled from the municipal code (last reviewed 2026-06-08) 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) 864-0019 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.