ADU · Orange County

Can you build an ADU in Walden, NY?

Village of Walden has 16 districts. 8 districts prohibit ADUs, 8 allow them with occupancy restrictions. Check your address to confirm the district that applies to your parcel:

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What the Walden code says

The only accessory dwelling in Walden is a caretaker's or owner's unit, permitted in R-2, R-3, R-4, R-5, R-6, RM-1, RM-2 and R-MHC, and occupancy follows the caretaker role or the ownership of the principal use rather than being open to a tenant.

Conditions the code attaches:

TH, B-1, B-2 and B-3 have no accessory unit, and in B-4, OLI, I-2 and MX a caretaker's or owner's unit is allowed only as accessory to a business or industrial use, not to a house.
Converting an existing single-family house to a two-family is a special exception use in R-2, R-6, RM-1 and RM-2, with no occupancy condition.
A two-family detached dwelling is permitted outright in R-2, R-6, RM-1, RM-2 and TH.
Multiple dwellings are permitted in RM-1 and RM-2.
A dwelling unit over the first floor of a nonresidential use is permitted in B-2, B-3 and MX.

What the Walden 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
Residential 1&2 Family	0.34 ac	40 / 20 / 40 ft	35 ft	Occupancy restricted
Residential 1 Family	0.28 ac	35 / 15 / 35 ft	35 ft	Occupancy restricted
Residential 1 Family	0.18 ac	30 / 10 / 30 ft	35 ft	Occupancy restricted
Residential 1 Family	0.12 ac	25 / 10 / 25 ft	35 ft	Occupancy restricted
Residential 1&2 & Multifamily	0.12 ac	25 / 10 / 25 ft	35 ft	Occupancy restricted
Multifamily Residential	0.12 ac	25 / 10 / 25 ft	35 ft	Occupancy restricted
Multifamily Residential	0.17 ac	20 / 15 / 15 ft	35 ft	Occupancy restricted
Mobile Home Court	0.28 ac	35 / 15 / 35 ft	35 ft	Occupancy restricted
Townhouse	2 ac	—	35 ft	No
Neighborhood Business	0.23 ac	50 / 20 / 30 ft	35 ft	No
Village Business	—	0 / 12 / 20 ft	35 ft	No
Central Business	—	0 / 12 / 20 ft	35 ft	No
Service Commercial	0.23 ac	50 / 10 / 30 ft	35 ft	No
Office Light Industry	0.92 ac	50 / 30 / 50 ft	35 ft	No
Village Industry	0.12 ac	0 / 12 / 20 ft	35 ft	No
Mixed Use	—	0 / 0 / 5 ft	35 ft	No

ADUs vs. short-term rentals in Walden

Short-term rentals allowed with local rules for Village of Walden. Short-term rentals in the Village of Walden are regulated under Article XIII of Chapter 305, Zoning, added by Local Law No. 5 of 2022. 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 minimum0.12–0.34 ac — an ADU still has to fit the district's lot and setback envelope.
UtilityCentral Hudson territory.
Zoning codeecode360.com/WA0823
Building dept(845) 778-2177

ADU FAQ — Walden, NY

Are ADUs allowed in Walden, NY?

Village of Walden has 16 districts. 8 districts prohibit ADUs, 8 allow them with occupancy restrictions. Check your address with the free ADU checker, or confirm with the building department at (845) 778-2177.

Do I need a special permit for an ADU in Walden?

No district in Village of Walden requires a special-use permit for an ADU - 8 districts prohibit ADUs, 8 allow them with occupancy restrictions. Site-plan review or a building permit may still apply.

Can I use an ADU as a short-term rental in Walden?

Short-term rentals allowed with local rules for Village of Walden. 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 Walden

Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $205k–270k 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 Walden, priced by size.

How we know this

Sections analyzed: 305 Attachment 1 (Residential Districts Table of Use Regulations) · 305 Attachment 2 (Business Etc. Table of Use Regulations) · § 305-5
Districts confirmed: 16 of 16 — every mapped district.
Last reviewed: 2026-07-12
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 Walden: Full zoning for new construction · ADU build cost · House build cost · ADU rules across Orange County · All Orange County towns

ADU information for Village of Walden is compiled from the municipal code (last reviewed 2026-07-12) 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) 778-2177 before relying on any answer. Source: the Offsite / Aldo zoning dataset.