ADU · Rockland County
Can you build an ADU in Piermont, NY?
Village of Piermont has 14 districts. 13 districts prohibit ADUs, 1 allows them. Check your address to confirm the district that applies to your parcel:
What the Piermont 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 |
|---|---|---|---|---|
| Single-Family Residential (min lot width 200 ft; combined side yards 100 ft; max FAR 8%; 2 1/2 stories. Special permit uses require 100,000 sf on 250 ft of width with 12% lot coverage) | 1.84 ac | 60 / 50 / 60 ft | 32 ft | As of right |
| Single-Family Residential (min lot width 175 ft; combined side yards 80 ft; max FAR 15%; 2 1/2 stories. Special permit uses require 60,000 sf on 200 ft of width with 13% lot coverage) | 0.92 ac | 50 / 35 / 50 ft | 32 ft | No |
| Single-Family Residential (min lot width 150 ft; combined side yards 80 ft; max FAR 20%; 2 1/2 stories) | 0.46 ac | 35 / 35 / 40 ft | 32 ft | No |
| Single-Family Residential (min lot width 125 ft; combined side yards 65 ft; max FAR 22%; 2 1/2 stories. Maximum lot coverage is 24.5%, stored here as the integer 24) | 0.34 ac | 35 / 30 / 33 ft | 32 ft | No |
| Single-Family Residential (min lot width 100 ft; max FAR 27%; 2 1/2 stories. Not more than two nontransient boarders are allowed as an accessory use) | 0.23 ac | 30 / 20 / 40 ft | 32 ft | No |
| Single-Family Residential (min lot width 75 ft; combined side yards 25 ft; max FAR 30%; 2 1/2 stories) | 0.17 ac | 25 / 10 / 30 ft | 32 ft | No |
| Single-Family Residential (min lot width 25 ft; combined side yards 10 ft; max FAR 75%; 2 1/2 stories. No front yard is required. One-family detached dwellings are a special permit use here — nothing is permitted by right) | 0.03 ac | 0 / 5 / 5 ft | 32 ft | No |
| Multifamily Residential (one-family row shown. Multiple dwellings require 1 acre at 3,000 sf per dwelling unit, 100 ft of width per acre, 40 ft front, 30 ft side, 50 ft rear, 3 stories/35 ft and 30% FAR, and no wall or group of attached dwellings may run more than 160 ft in one plane. Min lot width 175 ft; combined side yards 80 ft; max FAR 15%. No maximum lot coverage is set) | 0.92 ac | 40 / 35 / 50 ft | 35 ft | No |
| Waterfront (min lot width 100 ft; combined side yards 50 ft; max FAR 27%; 2 stories. One-family dwellings with professional offices and all other permitted uses require 15,000 sf) | 0.23 ac | 30 / 20 / 40 ft | 25 ft | No |
| Waterfront (min lot width 100 ft; combined side yards 50 ft; max FAR 27%; 2 stories. One-family dwellings with professional offices and all other permitted uses require 15,000 sf. No maximum lot coverage is set) | 0.23 ac | 30 / 20 / 40 ft | 25 ft | No |
| Business B (one-family dwellings WITH direct water frontage shown; without water frontage the front yard is 25 ft. Min lot width 75 ft; combined side yards 25 ft; max FAR is the same as the R-7.5 District, 30%; 2 1/2 stories. Studios and professional offices require 10,000 sf, all other permitted uses 20,000 sf. No maximum lot coverage is set) | 0.17 ac | 20 / 10 / 30 ft | 35 ft | No |
| Business A (all permitted uses; min lot width 100 ft; combined side yards 50 ft; 2 stories. No FAR and no maximum lot coverage are set) | 1 ac | 100 / 25 / 50 ft | 30 ft | No |
| Central Business Multi-Use (one-family row shown: two-family dwellings require 2,500 sf at 1,250 sf per unit and multiple dwellings 3,750 sf at 1,250 sf per unit. Min lot width 25 ft; max FAR 1.0; 3 stories. Front and side yards may be zero, but a side yard where provided must be 10 ft. No maximum lot coverage is set) | 0.04 ac | 0 / 0 / 25 ft | 35 ft | No |
| Riverfront (East and West; no minimum lot area or width — residential capacity is capped at 317 units for the overall site, 263 in RD-East and 54 in RD-West. All structures set back 35 ft from the nearest property line, which the Board of Trustees may modify. Maximum building coverage 30%; maximum DEVELOPMENT coverage, counting parking and all impervious surfaces, 60%. 3 stories/35 ft, which the Board may increase for adaptive reuse of buildings erected before 1930) | — | 35 / 35 / 35 ft | 35 ft | No |
ADUs vs. short-term rentals in Piermont
Short-term rentals allowed with local rules for Village of Piermont. Short-term rentals require Village registration and a permit under Chapter 117, Article III, Short-Term Rental Registry and Permits. § 117-11 makes short-term rentals permitted by special permit, and §§ 117-3 and 117-7 impose the underlying rental dwelling registration and rental permit requirements, with broker and agent responsibility attached. Bed-and-breakfasts sit separately at Article XX. New York State's 2025 short-term rental registry (Ch. 99 of the Laws of 2025) separately requires every host statewide to register the unit regardless of local law. Confirm with Village of Piermont at (845) 359-1258 before listing. 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 minimum0.03–1.84 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityOrange & Rockland territory.
- Building dept(845) 359-1258
- Last reviewed2026-07-22
ADU FAQ — Piermont, NY
Are ADUs allowed in Piermont, NY?
Village of Piermont has 14 districts. 13 districts prohibit ADUs, 1 allows them. Check your address with the free ADU checker, or confirm with the building department at (845) 359-1258.
Do I need a special permit for an ADU in Piermont?
No district in Village of Piermont requires a special-use permit for an ADU - 13 districts prohibit ADUs, 1 allows them. Site-plan review or a building permit may still apply.
Can I use an ADU as a short-term rental in Piermont?
Short-term rentals allowed with local rules for Village of Piermont. 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 Piermont
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 Piermont, priced by size.
More on Piermont: Full zoning for new construction · ADU build cost · House build cost · All Rockland County towns
ADU information for Village of Piermont is compiled from the municipal code (last reviewed 2026-07-22) 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) 359-1258 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.