ADU · Saratoga County
Can you build an ADU in Charlton, NY?
Town of Charlton has 3 districts. All districts allow ADUs. Check your address to confirm the district that applies to your parcel:
What the Charlton 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 District (the Town's principal district: a private dwelling — including one with a customary home occupation — on 4 ACRES WITH 2 ACRES OF BUILDABLE LAND, 400 ft of lot width AND 400 ft of frontage, a 30 FT maximum height, a 60 ft front yard, 15 ft minimum side yard with 40 ft for both sides combined, and a 50 ft rear yard. MINIMUM LOT AREA IS TWO REQUIREMENTS, NOT ONE: '4 acres WITH 2 ACRES BUILDABLE LAND'. A four-acre parcel that cannot show two acres of buildable land does not qualify, so wetland, slope and floodplain reduce the effective yield before any yard is measured. Table IV-2 notes 1 and 2 point to Article VII for special-permit dimensions and to Article VIII and the Subdivision Regulations for the cases where less than four acres or less than 400 ft of frontage or width is permitted — check those before concluding a smaller parcel is unbuildable. The side yard is a pair and both figures bind: a minimum for ONE side and a larger minimum for the TWO COMBINED. sideSetback records the one-side figure. THE 400 FT WIDTH AND FRONTAGE ARE AS BINDING AS THE ACREAGE and will disqualify many four-acre parcels outright — a square four-acre lot is only about 417 ft on a side, so the district effectively requires near-square or wider geometry. ALL OTHER NON-AGRICULTURAL USES ARE HELD TO A MUCH DEEPER ENVELOPE on the same lot: 40 ft height rather than 30, and 100 ft front, 100 ft total side, 50 ft minimum side and 50 ft rear — so a non-residential building sits roughly twice as far from every boundary as a house does. THE PERCENTAGE COLUMN IS NOT LOT COVERAGE. Table IV-2's last column is headed 'Maximum Percentage of ACCESSORY BUILDING Coverage' — it caps accessory buildings only and says nothing about the principal dwelling. Charlton states NO principal-building coverage limit anywhere, so maxLotCoverage is null by design. Recording the 5% or 10% figure as lot coverage would understate the buildable footprint by an order of magnitude and is the single easiest mistake to make in this code. Accessory buildings here are capped at 5% of the lot.) | 4 ac | 60 / 15 / 50 ft | 30 ft | As of right |
| Agricultural District (dimensionally almost identical to Rural — a private dwelling on 4 ACRES WITH 2 ACRES BUILDABLE, 400 ft width and 400 ft frontage, 30 ft height, 60 ft front and 50 ft rear — WITH ONE DELIBERATE DIFFERENCE THAT IS EASY TO MISS: THE SIDE YARDS ARE FAR DEEPER. A dwelling in the Agricultural District needs a 40 FT MINIMUM SIDE YARD with 100 FT FOR BOTH SIDES COMBINED, against Rural's 15 ft and 40 ft. That is more than double the one-side figure and two and a half times the combined, and it is the Town separating houses from working farmland rather than from each other. The side yard is a pair and both figures bind: a minimum for ONE side and a larger minimum for the TWO COMBINED. sideSetback records the one-side figure. MINIMUM LOT AREA IS TWO REQUIREMENTS, NOT ONE: '4 acres WITH 2 ACRES BUILDABLE LAND'. A four-acre parcel that cannot show two acres of buildable land does not qualify, so wetland, slope and floodplain reduce the effective yield before any yard is measured. Table IV-2 notes 1 and 2 point to Article VII for special-permit dimensions and to Article VIII and the Subdivision Regulations for the cases where less than four acres or less than 400 ft of frontage or width is permitted — check those before concluding a smaller parcel is unbuildable. Non-agricultural uses take the same 40 ft height and 100 ft front, 100 ft total side, 50 ft side and 50 ft rear as in Rural, and per Table IV-2 note 3 they additionally REQUIRE TOWN OF CHARLTON PLANNING BOARD APPROVAL (Appendix B-5) — a review requirement that does not attach to the equivalent Rural uses. Agricultural operations themselves sit outside this row. THE PERCENTAGE COLUMN IS NOT LOT COVERAGE. Table IV-2's last column is headed 'Maximum Percentage of ACCESSORY BUILDING Coverage' — it caps accessory buildings only and says nothing about the principal dwelling. Charlton states NO principal-building coverage limit anywhere, so maxLotCoverage is null by design. Recording the 5% or 10% figure as lot coverage would understate the buildable footprint by an order of magnitude and is the single easiest mistake to make in this code. Accessory buildings capped at 5%.) | 4 ac | 60 / 40 / 50 ft | 30 ft | As of right |
| Historic Overlay District (adopted under Local Law 2 of 1973 and mapped in Appendix A, with review by the Historic District Commission under Appendix B-3. ITS USES ARE 'SAME AS RURAL (R)' BUT ITS DIMENSIONS ARE MATERIALLY MORE PERMISSIVE, WHICH IS THE OPPOSITE OF WHAT AN OVERLAY USUALLY DOES: 2 ACRES with 2 acres buildable against Rural's 4, only 100 FT of lot width and 100 ft of frontage against Rural's 400, and a 30 ft front yard against 60. Height stays at 30 ft, the minimum side yard at 15 ft with 40 ft combined, and the rear yard at 50 ft. So the Historic Overlay HALVES the lot requirement and QUARTERS the width and frontage — it protects the historic hamlet pattern by permitting the small, close-set lots that pattern actually consists of, rather than by imposing extra bulk restrictions. Anyone assuming an overlay must be more restrictive will badly misjudge a Charlton historic parcel. THE TRADE IS PROCEDURAL RATHER THAN DIMENSIONAL: development here goes through the Historic District Commission, so the constraint is design review, not lot geometry. THE PERCENTAGE COLUMN IS NOT LOT COVERAGE. Table IV-2's last column is headed 'Maximum Percentage of ACCESSORY BUILDING Coverage' — it caps accessory buildings only and says nothing about the principal dwelling. Charlton states NO principal-building coverage limit anywhere, so maxLotCoverage is null by design. Recording the 5% or 10% figure as lot coverage would understate the buildable footprint by an order of magnitude and is the single easiest mistake to make in this code. Accessory buildings are capped at 10% here, double the 5% allowed in Rural and Agricultural — consistent with the smaller lots. The side yard is a pair and both figures bind: a minimum for ONE side and a larger minimum for the TWO COMBINED. sideSetback records the one-side figure.) | 2 ac | 30 / 15 / 50 ft | 30 ft | As of right |
ADUs vs. short-term rentals in Charlton
No local short-term-rental law on record - which is not the same as permission for Town of Charlton. No short-term-rental provision exists in the Town of Charlton Zoning Law, and this is confirmed against the CURRENT text: the operative law is the Zoning Law ADOPTED JANUARY 26, 2026, whose Section 4 repeals and replaces the April 2025 law and every prior version in their entirety. The law defines no short-term rental or vacation rental use and creates no registration or licensing requirement — a notable omission in a 2025 rewrite, since most codes of that vintage address it one way or the other. THE ONE ENUMERATED TRANSIENT USE IS THE BED AND BREAKFAST, defined as a private residential structure, EITHER OWNER-OCCUPIED OR UNDER RESIDENT MANAGEMENT, offering lodging for compensation INCIDENTAL TO THE RESIDENTIAL USE, and limited in number of rooms. It is a SITE PLAN REVIEW (SPR) use in all three districts, and where a bed and breakfast is proposed as part of a farm operation, additional provisions apply. Note that the law's definition of 'dwelling' expressly EXCLUDES the duplex, multiple dwelling, mobile home and TOURIST HOME — so a tourist home is affirmatively outside the definition of a dwelling rather than merely unlisted, which is a stronger signal than most codes give. Recorded 'unknown' rather than 'prohibited' because the Town has not legislated on short-term rental specifically and whole-house rental of a permitted private dwelling is arguably the residential use itself — but note the bed-and-breakfast definition's 'incidental to the residential use' language points away from whole-house commercial rental. Absence of a found STR provision is NOT permission. Get a written answer from the Zoning Enforcement Officer at (518) 384-0152 before underwriting short-term rental income. Separately, New York State has required every short-term-rental host to register the unit with the State through the county registry since 2025, regardless of what the municipality allows, and Saratoga County HAS adopted a county-level short-term-rental programme: a 3% occupancy tax and a MANDATORY county registry, covering any room or space in a dwelling let for under 30 consecutive days. Registration runs two years, an unregistered host faces fines of up to $500, and the booking platform is separately liable for processing an unregistered listing — so Airbnb and Vrbo will delist. The City of Saratoga Springs runs its own registry alongside it. 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 minimum2–4 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityNational Grid territory.
- Building dept(518) 384-0152
- Last reviewed2026-08-01
ADU FAQ — Charlton, NY
Are ADUs allowed in Charlton, NY?
Town of Charlton has 3 districts. All districts allow ADUs. Check your address with the free ADU checker, or confirm with the building department at (518) 384-0152.
Do I need a special permit for an ADU in Charlton?
No district in Town of Charlton requires a special-use permit for an ADU - 3 districts allow ADUs. Site-plan review or a building permit may still apply.
Can I use an ADU as a short-term rental in Charlton?
No local short-term-rental law on record - which is not the same as permission for Town of Charlton. 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 Charlton
Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $200k–260k 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 Charlton, priced by size.
More on Charlton: Full zoning for new construction · ADU build cost · House build cost · All Saratoga County towns
ADU information for Town of Charlton is compiled from the municipal code (last reviewed 2026-08-01) 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) 384-0152 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.