ADU · Ulster County
Can you build an ADU in Plattekill, NY?
Town of Plattekill has 8 districts. 5 districts allow ADUs, 3 do not. Check your address to confirm the district that applies to your parcel:
What the Plattekill 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 |
|---|---|---|---|---|
| RS-1 Residential Settlement | 1 ac | 50 / 30 / 30 ft | 35 ft | As of right |
| HR-1 Hamlet Residential | 1 ac | 35 / 30 / 30 ft | 35 ft | As of right |
| RR-1.5 Rural Residential | 1.5 ac | 50 / 50 / 50 ft | 35 ft | As of right |
| AG-1.5 Agricultural | 1.5 ac | 50 / 50 / 50 ft | 35 ft | As of right |
| BD-40 Business District | 0.9183 ac | 35 / 25 / 25 ft | 35 ft | No |
| BD-60 Light Business District | 1.3774 ac | 35 / 25 / 25 ft | 35 ft | No |
| GB-80 General Business District | 1.8365 ac | 50 / 50 / 50 ft | 35 ft | No |
| M-3 Mountain District | 3 ac | 50 / 50 / 50 ft | 35 ft | As of right |
RS-1 Residential Settlement, RR-1.5 Rural Residential — The base row is column A, on-site sewage and water. The schedule prints FOUR utility columns for every district: A on-site, B central water only, C central sewage only, D central sewage and water. The lot area column is also the land per dwelling unit.
HR-1 Hamlet Residential — The base row is column A, on-site sewage and water. The schedule prints FOUR utility columns for every district: A on-site, B central water only, C central sewage only, D central sewage and water. The lot area column is also the land per dwelling unit. The D column carries an asterisk in this district whose footnote is not printed beside the block; the only asterisk note on the page marks uses requiring Planning Board site plan review.
AG-1.5 Agricultural — The base row is column A, on-site sewage and water. The schedule prints FOUR utility columns for every district: A on-site, B central water only, C central sewage only, D central sewage and water. The lot area column is also the land per dwelling unit. All four utility columns are identical in AG-1.5 — the district does not relax with central service, which is the point of an agricultural district. No variants, correctly.
BD-40 Business District, BD-60 Light Business District, GB-80 General Business District — The base row is column A, on-site sewage and water. The schedule prints FOUR utility columns for every district: A on-site, B central water only, C central sewage only, D central sewage and water. The lot area column is also the land per dwelling unit. The side and rear yards carry the schedule's asterisk: ADD 25 FEET where the lot abuts a residential district boundary. Abutting-district status is not a condition axis, so the figures above are the unabutted case.
M-3 Mountain District — The base row is column A, on-site sewage and water. The schedule prints FOUR utility columns for every district: A on-site, B central water only, C central sewage only, D central sewage and water. The lot area column is also the land per dwelling unit. All four utility columns are identical in M-3. The side and rear yards carry the schedule's asterisk: ADD 25 FEET where the lot abuts a residential district boundary. Abutting-district status is not a condition axis, so the figures above are the unabutted case.
ADUs vs. short-term rentals in Plattekill
Short-term rentals allowed with local rules for Town of Plattekill. Short-term rentals require an annual Town permit under Chapter 86, Short-Term Rentals, adopted 10-15-2025 by L.L. No. 4-2025. The chapter applies to every STR including those operating before it took effect (§ 86-1). A permit application goes to the Building Department with a posted safety/egress plan and a parking layout (§ 86-2), and the law is written around STRs of 10 guests or fewer. §§ 86-4 and 86-5 set out grounds for denial and revocation. 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 Town of Plattekill at (845) 883-7184 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. Municipal source
Good to know
- Residential lot minimum1–1.5 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityCentral Hudson territory.
- Zoning codeshepstone.net/wp-content/uploads/2016/08/Plattekill.pdf
- Building dept(845) 883-7184
- Last reviewed2026-08-16
ADU FAQ — Plattekill, NY
Are ADUs allowed in Plattekill, NY?
Town of Plattekill has 8 districts. 5 districts allow ADUs, 3 do not. Check your address with the free ADU checker, or confirm with the building department at (845) 883-7184.
Do I need a special permit for an ADU in Plattekill?
No district in Town of Plattekill requires a special-use permit for an ADU - 5 districts allow ADUs, 3 do not. Site-plan review or a building permit may still apply.
Can I use an ADU as a short-term rental in Plattekill?
Short-term rentals allowed with local rules for Town of Plattekill. 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 Plattekill
Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $200k–265k 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 Plattekill, priced by size.
More on Plattekill: Full zoning for new construction · ADU build cost · House build cost · All Ulster County towns
ADU information for Town of Plattekill is compiled from the municipal code (last reviewed 2026-08-16) 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) 883-7184 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.