ADU · Putnam County
Can you build an ADU in Philipstown, NY?
Town of Philipstown has 9 districts. 8 districts allow ADUs with a special-use permit, 1 does not. Check your address to confirm the district that applies to your parcel:
What the Philipstown 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 |
|---|---|---|---|---|
| Rural Conservation (min lot 10 acres for a conventional subdivision, or 5 acres per dwelling unit under the conservation-density option; 250 ft town-road / 300 ft county-road frontage; combined this is a low-density open-space district. Maximum IMPERVIOUS surface coverage 10%; nonresidential structures capped at 6,000 sf footprint; 3 stories) | 10 ac | 60 / 30 / 50 ft | 40 ft | Special permit |
| Rural Residential (min lot 5 acres conventional, or 3 acres per dwelling unit conservation-density; 250 ft town-road / 400 ft county-road frontage. Maximum IMPERVIOUS surface coverage 10%; nonresidential footprint capped at 4,000 sf; 3 stories) | 5 ac | 60 / 30 / 50 ft | 40 ft | Special permit |
| Hamlet Mixed-Use (min lot size VARIES with the availability of municipal water and sewer per § 175-11D — no single figure applies, so minLotSize is null. This is the town center: 25 ft town-road front setback, 10 ft side (may be zero for party-wall or zero-lot-line buildings), 15 ft rear; a build-to line may be set to hold the street wall. Maximum IMPERVIOUS surface coverage 50%; nonresidential footprint capped at 10,000 sf, raisable to 60,000 sf by special permit for a supermarket or theater; 3 stories) | — | 25 / 10 / 15 ft | 40 ft | Special permit |
| Hamlet Residential (min lot size VARIES with municipal water and sewer per § 175-11D, so minLotSize is null; 25 ft town-road front, 10 ft side, 10 ft rear. Maximum IMPERVIOUS surface coverage 30%; nonresidential footprint capped at 5,000 sf; 3 stories) | — | 25 / 10 / 10 ft | 40 ft | Special permit |
| Suburban Residential (min lot 40,000 sf conventional; 200 ft frontage; 50 ft town-road front setback, 30 ft side, 25 ft rear. Maximum IMPERVIOUS surface coverage 20%; nonresidential footprint capped at 5,000 sf; 3 stories) | 0.92 ac | 50 / 30 / 25 ft | 40 ft | Special permit |
| Highway Commercial (min lot 40,000 sf; 200 ft town-road / 300 ft county-road frontage; 25 ft town-road front setback, 15 ft side, 35 ft rear, with a wooded buffer required where the lot abuts a residential district. Maximum IMPERVIOUS surface coverage 60%; nonresidential footprint capped at 40,000 sf; 3 stories) | 0.92 ac | 25 / 15 / 35 ft | 40 ft | Special permit |
| Office/Commercial/Industry Mixed-Use (min lot 2 acres; 200 ft frontage; 50 ft town-road / 100 ft county-road front setback, 20 ft side, 35 ft rear, wooded buffer where abutting a residential district. Maximum IMPERVIOUS surface coverage 60%; nonresidential footprint capped at 200,000 sf; 3 stories) | 2 ac | 50 / 20 / 35 ft | 40 ft | Special permit |
| Industrial/Manufacturing (min lot 5 acres; 200 ft frontage; 100 ft front setback, 50 ft side, 50 ft rear, wooded buffer where abutting a residential district. Maximum IMPERVIOUS surface coverage 30%; no nonresidential footprint cap; 3 stories) | 5 ac | 100 / 50 / 50 ft | 40 ft | No |
| Institutional Conservation (min lot 20 acres, or 20 acres per dwelling unit conservation-density; 200 ft frontage; 50 ft town-road / 100 ft county-road front setback, 50 ft side, 50 ft rear. Maximum IMPERVIOUS surface coverage 10%; 3 stories) | 20 ac | 50 / 50 / 50 ft | 40 ft | Special permit |
ADUs vs. short-term rentals in Philipstown
Short-term-rental status not confirmed for Town of Philipstown. Short-term rental status not confirmed for the Town of Philipstown. The Use Table does not list a short-term-rental use; the nearest listed uses are 'bed-and-breakfast' (permitted by right subject to site plan in every district) and accessory apartments — neither is a whole-house short-term rental. Absence of a found STR provision is NOT permission: call the Building Department at (845) 265-5202 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 minimum0.92–10 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityCentral Hudson territory.
- Building dept(845) 265-5202
- Last reviewed2026-07-23
ADU FAQ — Philipstown, NY
Are ADUs allowed in Philipstown, NY?
Town of Philipstown has 9 districts. 8 districts allow ADUs with a special-use permit, 1 does not. Check your address with the free ADU checker, or confirm with the building department at (845) 265-5202.
Do I need a special permit for an ADU in Philipstown?
It depends on the district: 8 of 9 require a special-use permit, the rest do not. Check the district that applies to your parcel before you design.
Can I use an ADU as a short-term rental in Philipstown?
Short-term-rental status not confirmed for Town of Philipstown. 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 Philipstown
Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $215k–285k 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 Philipstown, priced by size.
More on Philipstown: Full zoning for new construction · ADU build cost · House build cost · All Putnam County towns
ADU information for Town of Philipstown is compiled from the municipal code (last reviewed 2026-07-23) 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) 265-5202 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.