ADU · Sullivan County

Can you build an ADU in Liberty, NY?

Village of Liberty has 5 districts. All districts prohibit ADUs. Check your address to confirm the district that applies to your parcel:

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What the Liberty code says

There is no accessory apartment use, and nothing provides for a detached accessory dwelling. Carving a second unit out of an existing house is a residential conversion needing a special use permit in R-1, R-2 and C, which makes two full dwellings rather than an accessory unit.

Conditions the code attaches:

A conversion cannot push residential density past what the district permits, and a two-unit result needs 13,500 sf in R-1, 9,450 sf in R-2 and 5,400 sf in C (§ 87-30, § 87-10.A).
The conversion must provide adequate parking and show sewage treatment and water supply capacity for the added need, and a building permit is required (§ 87-30).
Minimum floor area per dwelling unit is 1,000 sf in R-1 and 800 sf in R-2 and C.
There is no owner occupancy requirement and no size cap on the added unit, so the resulting unit can be rented.
In DCC dwellings are allowed only on upper stories above commercial space, and live and work units by special use, not as a unit added to a house.
Two-family dwellings are a principal permitted use in R-1, R-2 and C, so building one new on a conforming lot does not go through the conversion permit (§ 87-10.A).

What the Liberty 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 Low Density	0.23 ac	25 / 10 / 30 ft	35 ft	No
Residential High Density	0.16 ac	25 / 8 / 30 ft	35 ft	No
Commercial	0.092 ac	20 / 10 / 10 ft	44 ft	No
Downtown Commercial Core	0.092 ac	20 / 0 / 0 ft	44 ft	No
Manufacturing	0.092 ac	20 / 50 / 50 ft	44 ft	No

Residential Low Density - A lot here needs 10,000 square feet, 80 feet of width and 100 feet of depth. A building sits 25 feet back from the front line, 10 feet from each side with 25 feet for both, and 30 feet from the rear, and reaches 35 feet and 2.5 stories.

Hard surface may cover 20% of the lot, because the chapter counts the building together with every impervious surface, parking included.
Each dwelling unit needs at least 1,000 square feet of floor area.
A two family dwelling needs 135% of the lot area a one family dwelling needs.
Density for two family and multifamily is the dwelling units per acre allowed for one family use, or six units per acre, whichever is less.
A residential lot needs a front lot line at least 50 feet long, which is frontage rather than lot width.
Spires, chimneys, flagpoles and similar structures nobody lives in stay exempt from the height limit below 150 feet.

Residential High Density - A lot here needs 7,000 square feet, 60 feet of width and 100 feet of depth. A building sits 25 feet back from the front line, 8 feet from each side with 20 feet for both, and 30 feet from the rear, and reaches 35 feet and 2.5 stories.

Hard surface may cover 20% of the lot, because the chapter counts the building together with every impervious surface, parking included.
Each dwelling unit needs at least 800 square feet of floor area.
A two family dwelling needs 135% of the lot area a one family dwelling needs.
A multifamily dwelling needs a special permit, and density is the dwelling units per acre allowed for one family use, or six units per acre, whichever is less.
A residential lot needs a front lot line at least 50 feet long, which is frontage rather than lot width.
Spires, chimneys, flagpoles and similar structures nobody lives in stay exempt from the height limit below 150 feet.

Commercial - A lot here needs 4,000 square feet, 50 feet of width and 80 feet of depth. A building sits 20 feet back from the front line, 10 feet from each side with 20 feet for both, and 10 feet from the rear, and reaches 44 feet and 4 stories.

Hard surface may cover 100% of the lot, because the chapter counts the building together with every impervious surface, parking included.
Each dwelling unit needs at least 800 square feet of floor area.
A one family or two family dwelling is permitted outright, and a two family dwelling needs 135% of the lot area a one family dwelling needs.
A multifamily dwelling, a hotel or motel, and a housing or residential development each need a special permit.
A residential lot needs a front lot line at least 50 feet long, which is frontage rather than lot width.
Spires, chimneys, flagpoles and similar structures nobody lives in stay exempt from the height limit below 150 feet.

Downtown Commercial Core - A lot here needs 4,000 square feet, 50 feet of width and 80 feet of depth. A building sits 20 feet back from the front line, reaches 44 feet and 4 stories, and the schedule asks for no side yard and no rear yard.

Hard surface may cover 100% of the lot, because the chapter counts the building together with every impervious surface, parking included.
Each dwelling unit needs at least 800 square feet of floor area.
Dwellings here sit on the upper storeys, and a live and work unit needs a special permit.
A printing operation needs a special permit and must stay under 2,500 square feet.
A residential lot needs a front lot line at least 50 feet long, which is frontage rather than lot width.
Spires, chimneys, flagpoles and similar structures nobody lives in stay exempt from the height limit below 150 feet.

Manufacturing - A lot here needs 4,000 square feet, 100 feet of width and 100 feet of depth. A building sits 20 feet back from the front line, 50 feet from each side with 100 feet for both, and 50 feet from the rear, and reaches 44 feet and 4 stories.

Hard surface may cover 100% of the lot, because the chapter counts the building together with every impervious surface, parking included.
Essential services are the only use permitted outright; manufacturing, light industrial, machine shops, warehousing and the rest each need a special permit.
No dwelling is listed for this district, so the schedule publishes no floor area per dwelling unit here.
A public garage for more than five motor vehicles may not have an entrance or exit within 50 feet of a residential district.
Spires, chimneys, flagpoles and similar structures nobody lives in stay exempt from the height limit below 150 feet.

ADUs vs. short-term rentals in Liberty

No local short-term-rental law on record - which is not the same as permission for Village of Liberty. No village-level short term rental law is confirmed for Liberty. That is not the same as permission, so treat short term renting as an open question and confirm with the building department before counting on the income. 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 minimum0.16–0.23 ac — an ADU still has to fit the district's lot and setback envelope.
UtilityNYSEG territory.
Zoning codeecode360.com/LI0200
Building dept(845) 292-8511

ADU FAQ — Liberty, NY

Are ADUs allowed in Liberty, NY?

Village of Liberty has 5 districts. All districts prohibit ADUs. Check your address with the free ADU checker, or confirm with the building department at (845) 292-8511.

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

No. No district in Village of Liberty permits an ADU, so there is no permit to apply for. Codes change, so verify with the building department at (845) 292-8511 before ruling it out.

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

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

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What an ADU costs to build in Liberty

Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $190k–250k 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 Liberty, priced by size.

How we know this

Sections analyzed: Ch. 87 (adopted 6-11-2008 by L.L. No. 4-2008) § 87-30 Conversions of Residential Structures; § 87-9.B unlisted uses; § 87-10.A lot standards; § 87-13; Schedule of District Regulations
Districts confirmed: 5 of 5 — every mapped district.
Last reviewed: 2026-10-07
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 Liberty: Full zoning for new construction · ADU build cost · House build cost · ADU rules across Sullivan County · All Sullivan County towns

ADU information for Village of Liberty is compiled from the municipal code (last reviewed 2026-10-07) 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) 292-8511 before relying on any answer. Source: the Offsite / Aldo zoning dataset.