ADU · Rensselaer County

Can you build an ADU in Castleton-on-Hudson, NY?

Village of Castleton-on-Hudson has 4 districts. All districts prohibit ADUs. Check your address to confirm the district that applies to your parcel:

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What the Castleton-on-Hudson code says

Castleton-on-Hudson has no accessory dwelling use. A two-family dwelling is permitted in R, and in MU subject to a footnote in the use schedule.

Conditions the code attaches:

In R, three- and four-unit buildings are permitted subject to the additional standards of Articles VI and VII, and multiple-family buildings also need site plan review.
Row houses are permitted in R and MU subject to additional standards.
No dwelling of any kind is permitted in I or WF.
Confirm with the building department at (518) 732-2211.

What the Castleton-on-Hudson 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
Residence District	0.23 ac	20 / 8 / 20 ft	35 ft	No
Mixed Use District	—	—	40 ft	No
Industrial District	0.23 ac	30 / 50 / 30 ft	35 ft	No
Waterfront District	0.17 ac	10 / 10 / - ft	35 ft	No

ADUs vs. short-term rentals in Castleton-on-Hudson

No local short-term-rental law on record - which is not the same as permission for Village of Castleton-on-Hudson. The Village of Castleton-on-Hudson has no local short-term rental law, and that is not the same as permission. Confirm with the building department 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 minimum0.23 ac — an ADU still has to fit the district's lot and setback envelope.
UtilityNational Grid territory.
Zoning codeecode360.com/26939707
Building dept(518) 732-2211

ADU FAQ — Castleton-on-Hudson, NY

Are ADUs allowed in Castleton-on-Hudson, NY?

Village of Castleton-on-Hudson has 4 districts. All districts prohibit ADUs. Check your address with the free ADU checker, or confirm with the building department at (518) 732-2211.

Do I need a special permit for an ADU in Castleton-on-Hudson?

No. No district in Village of Castleton-on-Hudson permits an ADU, so there is no permit to apply for. Codes change, so verify with the building department at (518) 732-2211 before ruling it out.

Can I use an ADU as a short-term rental in Castleton-on-Hudson?

No local short-term-rental law on record - which is not the same as permission for Village of Castleton-on-Hudson. 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.

Run the free ADU check for your parcel →

What an ADU costs to build in Castleton-on-Hudson

Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $195k–255k 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 Castleton-on-Hudson, priced by size.

How we know this

Sections analyzed: Ch. 210 Zoning (adopted 3-26-1984): Art II Terminology; Art III Establishment of Land Use Districts; Arts VI and VII additional standards; Art X Flood Hazard Overlay; Supplementary Regulations; Appendix I Schedule of Use Regulations (210 Attachment 3), its key and Residential/Residential Accessory blocks; 210 Attachments 1 and 2 Schedules of Area Regulations
Districts confirmed: 4 of 4 — every mapped district.
Last reviewed: 2026-09-16
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 Castleton-on-Hudson: Full zoning for new construction · ADU build cost · House build cost · ADU rules across Rensselaer County · All Rensselaer County towns

ADU information for Village of Castleton-on-Hudson is compiled from the municipal code (last reviewed 2026-09-16) 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 (518) 732-2211 before relying on any answer. Source: the Offsite / Aldo zoning dataset.