ADU · Monroe County
Can you build an ADU in Irondequoit, NY?
Town of Irondequoit has 4 districts. All districts prohibit ADUs. Check your address to confirm the district that applies to your parcel:
What the Irondequoit 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 |
|---|---|---|---|---|
| R-1 Residential District | 0.2204 ac | 30 / 8 / 30 ft | 30 ft | No |
| R-2 Residential District | 0.2204 ac | 30 / 8 / 30 ft | 30 ft | No |
| R-3 Residential District | 0.2204 ac | 30 / 8 / 30 ft | 30 ft | No |
| R-R Rural Residential District | 1.0331 ac | 50 / 15 / 50 ft | 30 ft | No |
ADUs vs. short-term rentals in Irondequoit
Short-term rentals allowed with local rules for Town of Irondequoit. Short-term rentals are regulated under Article XIIIB of Zoning Chapter 235, added 9-16-2025 by L.L. No. 9-2025 and amended in 2026 by L.L. Nos. 5-2026 and 6-2026. § 235-76.50 states a general prohibition and § 235-76.52 then requires a permit, so the use is available only on the terms the article sets; § 235-76.51 presumes a dwelling unit is an STR from advertising and § 235-76.54 sets the operating standards. Because the article was amended twice in 2026, confirm the current text. New York State's 2025 short-term rental registry (Ch. 99 of the Laws of 2025) separately requires every host statewide to register the unit regardless of local law. Confirm with Town of Irondequoit at (585) 336-6020 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 minimum0.2204–1.0331 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityRG&E territory.
- Building dept(585) 336-6020
- Last reviewed2026-08-07
ADU FAQ — Irondequoit, NY
Are ADUs allowed in Irondequoit, NY?
Town of Irondequoit has 4 districts. All districts prohibit ADUs. Check your address with the free ADU checker, or confirm with the building department at (585) 336-6020.
Do I need a special permit for an ADU in Irondequoit?
No. No district in Town of Irondequoit permits an ADU, so there is no permit to apply for. Codes change, so verify with the building department at (585) 336-6020 before ruling it out.
Can I use an ADU as a short-term rental in Irondequoit?
Short-term rentals allowed with local rules for Town of Irondequoit. 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 Irondequoit
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 Irondequoit, priced by size.
More on Irondequoit: Full zoning for new construction · ADU build cost · House build cost · All Monroe County towns
ADU information for Town of Irondequoit is compiled from the municipal code (last reviewed 2026-08-07) 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 (585) 336-6020 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.