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ADU · Greene County

Are ADUs allowed in Greene County, NY?

There is no county-wide answer. In New York an accessory dwelling unit is governed by the town, city or village — so the rule changes at every municipal line, and often between districts inside one town. Below is each of the 14 municipalities in Greene County, with what its zoning districts actually say.

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ADU rules by municipality in Greene County

Can you build an ADU in Athens, NY?

7 districts allow ADUs, 2 do not, 1 requires a special-use permit. 3 districts have incomplete data - verify with the building department at (518) 945-1052.

An accessory apartment inside the principal building is permitted with no Planning Board or ZBA review in Rr, Ru, Ru-1, Ag, OS, H and Ru-385, on a lot meeting the district minimum. It may be no more than half the size of the house. A detached unit needs a special use permit.

Ch. 180 Attachment 1 Table 1 Schedule of Uses, both accessory apartment rows (in principal building; not in principal building); § 180-43 Accessory apartments A through H; § 180-4 district list; § 180-15A Watershed Overlay prohibitions; Attachment 2 Table 2 Reviewed 2026-10-01 Full Athens ADU rules →

Can you build an ADU in Cairo, NY?

7 districts allow ADUs, 1 does not. 1 district has incomplete data - verify with the building department at (518) 622-3120.

An accessory apartment, or converting a house to a two-family, needs only a building permit in MS, HC, MS-COM, RR, MT, C-MU and C-I, with no site plan review or special permit. The apartment can be rented, but a lot can have an accessory apartment or a guest cottage, not both.

Town of Cairo Zoning Law (June 5, 2017) § G use categories; § H; Appendix A Schedule of Uses, Accessory Apartments and Guest Cottage rows Reviewed 2026-10-05 Full Cairo ADU rules →

Can you build an ADU in Catskill, NY?

5 districts allow ADUs, 1 does not, 1 requires a special-use permit.

An accessory apartment is permitted subject to site plan review under § 160-32, one per lot and clearly subordinate to the principal use. Because it depends on a principal dwelling, in C a one-family dwelling itself needs a special permit and in I no dwelling is listed.

Ch. 160 § 160-17 Table of Uses and its symbol legend; § 160-32 Accessory apartments, Art. VIII Supplementary Regulations Reviewed 2026-10-05 Full Catskill ADU rules →

Can you build an ADU in Coxsackie, NY?

All districts prohibit ADUs.

Coxsackie's code defines an accessory apartment, but no district lists one as a permitted use, so an accessory dwelling unit is not available. The second-unit option in the code is the two-family dwelling.

Reviewed 2026-10-05 Full Coxsackie ADU rules →

Can you build an ADU in Greenville, NY?

All districts allow ADUs with occupancy restrictions.

Greenville allows either an accessory apartment or an ECHO unit, though not both, at a single-family dwelling in every district. The unit cannot produce income: the owner may at no time receive rent for it.

Town of Greenville Zoning Law (adopted 9/21/15), Accessory Apartments and ECHO Housing Units §§ 1-8, particularly § 2 Location Reviewed 2026-10-05 Full Greenville ADU rules →

Can you build an ADU in Halcott, NY?

The only district allows ADUs.

One accessory apartment is permitted by right on any lot that meets the district minimum acreage, either inside the principal building or in a separate accessory structure. There is no owner occupancy requirement, so the unit can be let.

Town of Halcott Land Use Law (adopted May 2009, updated May 2017) Table 3.1 Land Use Schedule; § 4.4.4 Accessory apartments; § 4.4.3 Country Inn Reviewed 2026-10-05 Full Halcott ADU rules →

Can you build an ADU in Jewett, NY?

All districts allow ADUs with occupancy restrictions.

A second dwelling is reachable on a one-family lot in every district in Jewett, but only by Planning Board special use permit, and only as guest quarters or quarters for an elderly relative. Neither route may be rented out.

Ch. 165 § 165-19 Guest dwelling (amended 4-11-2018 by L.L. No. 3-2018); § 165-21.2 ECHO unit/in-law apartment; § 165-21.5 short-term rentals; district use table Reviewed 2026-10-05 Full Jewett ADU rules →

Can you build an ADU in Lexington, NY?

2 districts allow ADUs with a special-use permit, 1 does not.

An accessory dwelling unit requires a special permit from the Planning Board in H and RR, and is prohibited in C. Attached, detached and converted units all qualify, with a limit of one accessory unit per lot.

Zoning Law of the Town of Lexington § 4.02 Use Table and legend; § 4.01 closed list; § 5.14 Accessory Dwelling Units; Art. II definitions Reviewed 2026-10-05 Full Lexington ADU rules →

Can you build an ADU in New Baltimore, NY?

All districts prohibit ADUs.

The zoning code provides for no accessory dwelling unit in any district. Its use table carries no accessory apartment or two-family dwelling row, and § 112-12A limits each lot to one single- or two-family building.

Ch. 112 (L.L. No. 4 of 2016) § 112-9A/B/C use table and closed-list rule; § 112-12A one building per lot; § 112-17 accessory structures; § 112-18 multifamily; definitions (58)-(59) Reviewed 2026-10-05 Full New Baltimore ADU rules →

Can you build an ADU in Athens, NY?

5 districts prohibit ADUs, 2 require a special-use permit, 1 allows them with occupancy restrictions.

An accessory apartment is allowed in RL, RR and RM, between 320 and 800 square feet. Either the apartment or the house must be owner-occupied, so it cannot be a second rental. RL and RR need a special use permit; RM needs only site plan review.

Ch. 250 Attachment 1 Summary of Zoning Regulations (amended 5-13-2015 by L.L. No. 3-2015 and 3-24-2021 by L.L. No. 2-2021), Permitted Uses and Special Uses columns; § 250-25B Accessory apartments (1) general, (2) in the dwelling, (3) in an accessory structure Reviewed 2026-10-01 Full Athens ADU rules →

Can you build an ADU in Catskill, NY?

4 districts prohibit ADUs, 3 allow them with occupancy restrictions.

An accessory dwelling unit is allowed by special permit as an accessory use in R-1, R-2 and R-3. The owner must live in either the principal dwelling or the accessory unit, and a tenant who is not an immediate relative may not be charged more than 125% of fair market rent.

Village of Catskill Local Law No. 1 of 2025 (Accessory Dwelling Units, adopted April 2025): intent and purpose, the grant in the R1/R2/R3 Districts, the ADU definition, and Standards 1-24. Village of Catskill Zoning Regulations revised May 10, 2023: § 1.4, § 2.1 List of Districts, § 2.2 Zoning Map, § 3.1 Table of Uses and its closed-list rule, § 4.6 Off-Street Parking, Article XII enforcement Reviewed 2026-10-05 Full Catskill ADU rules →

Can you build an ADU in Coxsackie, NY?

All districts prohibit ADUs.

The village code has no accessory dwelling unit provision, so a second unit cannot be added as an accessory to a house. The route to a second unit is the two-family dwelling, a permitted principal use in MDR-1, MDR-2, MDR-3 and MR.

Ch. 155 Schedule A (residential districts) and Schedule B (WRC, VC, WD, NC, CC, CSR, I) — Principal Use rows and the NP/P/SP key Reviewed 2026-10-05 Full Coxsackie ADU rules →

Can you build an ADU in Hunter, NY?

All districts prohibit ADUs.

An accessory dwelling unit is not a permitted or special permit use in any district. Under § 4.2.E only the listed uses are permissible, and all others are expressly prohibited unless the Zoning Board of Appeals grants a use variance.

Village Zoning Law (L.L. #3 of 2013) § 4.2.E closed list; § 4.4 multiple principal buildings; Schedule 1 Use/Area/Coverage Regulations pp. 18-21; Art. 2 definitions Reviewed 2026-10-05 Full Hunter ADU rules →

Can you build an ADU in Tannersville, NY?

5 districts allow ADUs, 1 does not.

There is no accessory dwelling unit provision here. In R1, R2 and R3 a guest house or servants' quarters is a permitted detached accessory structure in a side or rear yard, but the code never says it may contain a kitchen, so a rentable unit is not assured.

Village Zoning Law (L.L. 2 of 2010) §§ 3.2.B.1.c, 4.2.B.1.c and 5.3.A.3 guest house; §§ 3.5 and 4.4 Prohibited Conversions; §§ 6.4-6.5 CBD; §§ 7.2-7.4 B1; § 8.2 CU; Art. 1B definitions Reviewed 2026-10-05 Full Tannersville ADU rules →

Greene County municipalities with no published zoning code

These 5 municipalities have no zoning code we can read online, which means an ADU question has to be answered by the municipality itself.

ADU questions people ask about Greene County

Are ADUs allowed in Greene County?

There is no single county-wide answer — ADUs are governed by each town, city and village, not by the county. Of the 14 Greene County municipalities with mapped zoning districts, 10 allow an accessory dwelling unit in at least one district, and 5 allow one by right somewhere. The section for your municipality below gives the specific answer.

Does Greene County issue ADU permits?

No. Zoning approval and building permits both come from the municipality — the town, city or village — not the county. County health departments do commonly review septic and water supply for a new dwelling unit, which is often the binding constraint on a rural lot.

What size ADU can I build in Greene County?

Size caps are set per municipality and frequently per district, and they are one of the details most often stated wrongly by national ADU sites. Open your municipality's page below for the code sections analyzed, then confirm the current figure with the building department before you design to it.

What an ADU costs to build in Greene County

Permission and budget are separate questions. See the Greene County cost-to-build breakdown for current per-square-foot ranges — an accessory unit runs above a full house per square foot, because the kitchen, bath, panel and heating plant cost the same at any size.

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More on Greene County: Zoning for new construction by town · Cost to build · ADU rules across every county we cover

ADU information for Greene County is compiled from each municipality's own code , most recently reviewed 2026-10-05, and provided for decision-support only — not legal or architectural advice. Eligibility, size, owner-occupancy and permit conditions vary by district and often carry exceptions; confirm with the municipality before relying on any answer. 2 of the 14 municipalities below still have one or more districts that have not been analyzed, and each says so in its own section. Source: the Offsite / Aldo zoning dataset.

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