ADU · Westchester County
Can you build an ADU in Eastchester, NY?
Town of Eastchester has 19 districts. 17 of 19 districts prohibit ADUs. 2 districts have incomplete data - verify with the building department at (914) 771-3317. Check your address to confirm the district that applies to your parcel:
What the Eastchester code says
An accessory dwelling unit is not permitted in R-10, R-15, R-20, R5, R6, R7.5, R1.5, R3, M1, M1500, M350, M700, RTD, DSC, GB, ORB or RB. The Town's route to a second household on one lot is the two-family R3 district, not an accessory unit.
Conditions the code attaches:
- In R-20, R-15, R-10, R7.5, R6, R5 and R1.5, no living quarters or sleeping rooms are permitted in any accessory building.
- In R-20, R-15, R-10, R7.5, R6 and R5, a resident family may keep no more than two boarders or lodgers, at no more than two persons per separate bedroom and with no separate cooking facility.
- Domestic servants employed on the premises count as part of the family, so they do not make a separate unit.
- Building Department: (914) 771-3317.
What the Eastchester 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 |
|---|---|---|---|---|
| One Family Residence | 0.23 ac | 30 / 14 / 25 ft | 20 ft | No |
| One Family Residence | 0.34 ac | 30 / 14 / 32 ft | 20 ft | No |
| One Family Residence | 0.46 ac | 35 / 18 / 34 ft | 20 ft | No |
| One Family Residence | 0.11 ac | 30 / 8 / 25 ft | 20 ft | No |
| One Family Residence | 0.14 ac | 30 / 10 / 25 ft | 20 ft | No |
| One Family Residence | 0.17 ac | 30 / 12 / 25 ft | 20 ft | No |
| Two Family Cluster Residence | 0.069 ac | 30 / 8 / 25 ft | 20 ft | No |
| Multi Family Residence | — | 25 / 22 / 30 ft | — | No |
| Multi-Family Residence | 0.034 ac | 35 / 23 / 50 ft | 25 ft | No |
| One Family Cluster Residence | 0.034 ac | 10 / - / 10 ft | 25 ft | No |
| Multi-Family Residence | 0.008 ac | 20 / 20 / 30 ft | 65 ft | No |
| Multi-Family Residence | 0.016 ac | 22 / 22 / 30 ft | 45 ft | No |
| Residential Transition | 0.014 ac | 20 / 20 / 30 ft | 35 ft | No |
| Designed Shopping Center | — | 50 / 20 / 55 ft | 50 ft | No |
| General Business | — | 10 / 12 / 30 ft | 35 ft | No |
| Open Retail Business | — | 50 / 10 / 50 ft | 35 ft | No |
| Retail Business | — | 10 / 10 / 30 ft | 45 ft | No |
| Park | — | — | — | — |
| Unzoned | — | — | — | — |
One Family Residence, One Family Residence - The second side yard must be at least 16 ft; the 14 ft figure shown applies to the first side only.
One Family Residence - The second side yard must be at least 20 ft; the 18 ft figure shown applies to the first side only.
One Family Residence - The second side yard must be at least 9 ft; the 8 ft figure shown applies to the first side only.
One Family Residence - Both side yards must be at least 10 ft.
One Family Residence - Both side yards must be at least 12 ft.
Two Family Cluster Residence - Each dwelling unit needs at least 3,000 sq ft of lot, and a one-family dwelling needs at least 5,000 sq ft.
- The second side yard must be at least 9 ft, and a side yard adjoining a street at least 14 ft.
Multi Family Residence - M1 appears to be the Town's multifamily district requiring at least 1,000 sq ft of lot per dwelling unit, with both side yards at least 22 ft. Confirm the district's standards with the building department before underwriting.
Multi-Family Residence - Each dwelling unit needs at least 1,500 sq ft of lot, but a one-family dwelling needs at least 5,000 sq ft and a two-family at least 6,000 sq ft.
- Both side yards must be at least 23 ft.
Multi-Family Residence - Each dwelling unit needs at least 350 sq ft of lot.
- Both side yards must be at least 20 ft.
Multi-Family Residence - Each dwelling unit needs at least 700 sq ft of lot, and impervious surface coverage is capped separately at 70%.
- Both side yards must be at least 22 ft.
Residential Transition - Each dwelling unit needs at least 600 sq ft of lot.
- Both side yards must be at least 20 ft.
Park - This is town-owned park land, not one of the Town's zoning districts.
Unzoned - This is not a zoning district. It covers land outside the mapped zoning districts, such as rights-of-way and water bodies.
ADUs vs. short-term rentals in Eastchester
No local short-term-rental law on record - which is not the same as permission for Town of Eastchester. The Town of Eastchester has no local short-term rental law, and that is not the same as permission. Confirm with the Town before counting on the use. 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 minimum0.008–0.46 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityCon Edison territory.
- Zoning codewww.eastchester.gov/departments/zoning_law.php
- Building dept(914) 771-3317
ADU FAQ — Eastchester, NY
Are ADUs allowed in Eastchester, NY?
Town of Eastchester has 19 districts. 17 of 19 districts prohibit ADUs. 2 districts have incomplete data - verify with the building department at (914) 771-3317. Check your address with the free ADU checker.
Do I need a special permit for an ADU in Eastchester?
17 of 19 districts prohibit ADUs, so no permit applies in those. 2 districts have incomplete data - verify with the building department at (914) 771-3317.
Can I use an ADU as a short-term rental in Eastchester?
No local short-term-rental law on record - which is not the same as permission for Town of Eastchester. 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 Eastchester
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 Eastchester, priced by size.
How we know this
- Districts confirmed
- 17 of 19 — 2 not yet analyzed, so this page does not answer for them.
- Last reviewed
- Not covered here
- Overlay districts, the zoning map, and any conditions attached to an individual parcel. Size limits and owner-occupancy terms sit in the code section above, not in this summary.
More on Eastchester: Full zoning for new construction · ADU build cost · House build cost · ADU rules across Westchester County · All Westchester County towns
ADU information for Town of Eastchester 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) 771-3317 before relying on any answer. Source: the Offsite / Aldo zoning dataset.