ADU · Rockland County
Can you build an ADU in New Hempstead, NY?
Village of New Hempstead has 7 districts. 6 districts allow ADUs with occupancy restrictions, 1 does not. Check your address to confirm the district that applies to your parcel:
What the New Hempstead 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 (FAR 0.10; building coverage capped at 3,750 sf, max impervious ratio 0.20) | 1.15 ac | 50 / 30 / 50 ft | 35 ft | Occupancy restricted |
| One-Family Residence (FAR 0.10; building coverage capped at 3,500 sf, max impervious ratio 0.20) | 0.92 ac | 50 / 25 / 50 ft | 35 ft | Occupancy restricted |
| One-Family Residence (FAR 0.12; building coverage capped at 3,250 sf, max impervious ratio 0.20) | 0.8 ac | 50 / 25 / 50 ft | 35 ft | Occupancy restricted |
| One-Family Residence (FAR 0.15; building coverage capped at 3,000 sf, max impervious ratio 0.25) | 0.57 ac | 35 / 20 / 35 ft | 35 ft | Occupancy restricted |
| One- and Two-Family Residence (1-family detached shown; 2-family detached requires 20,000 sf. FAR 0.18; building coverage capped at 2,500 sf, max impervious ratio 0.25) | 0.34 ac | 35 / 20 / 35 ft | 35 ft | Occupancy restricted |
| Laboratory-Office (FAR 0.25; max impervious ratio 0.75) | 1.38 ac | 75 / 75 / 75 ft | 45 ft | Occupancy restricted |
| Neighborhood Commercial District (FAR 0.30; max impervious ratio 0.75; height given as 2 stories with a table note rather than a figure) | 2 ac | 75 / 50 / 50 ft | — | No |
ADUs vs. short-term rentals in New Hempstead
Short-term-rental status not confirmed for Village of New Hempstead. Short-term rental status not confirmed for the Village of New Hempstead — Chapter 290 does not address transient rental, and no separate local STR law was found in a 2026-07-21 search of village and county sources. Absence of a found law is NOT permission: call the Building Department at (845) 354-8100 to confirm before listing a property. Separately, since 2025 New York State requires every short-term-rental host to register the unit with the State through the county registry, regardless of what the municipality allows. 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 minimum0.34–1.15 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityOrange & Rockland territory.
- Building dept(845) 354-8100
- Last reviewed2026-07-21
ADU FAQ — New Hempstead, NY
Are ADUs allowed in New Hempstead, NY?
Village of New Hempstead has 7 districts. 6 districts allow ADUs with occupancy restrictions, 1 does not. Check your address with the free ADU checker, or confirm with the building department at (845) 354-8100.
Do I need a special permit for an ADU in New Hempstead?
No district in Village of New Hempstead requires a special-use permit for an ADU - 6 districts allow ADUs with occupancy restrictions, 1 does not. Site-plan review or a building permit may still apply.
Can I use an ADU as a short-term rental in New Hempstead?
Short-term-rental status not confirmed for Village of New Hempstead. 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 New Hempstead
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 New Hempstead, priced by size.
More on New Hempstead: Full zoning for new construction · ADU build cost · House build cost · All Rockland County towns
ADU information for Village of New Hempstead 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) 354-8100 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.