ADU · Monroe County
Can you build an ADU in Henrietta, NY?
Town of Henrietta has 5 districts. All districts prohibit ADUs. Check your address to confirm the district that applies to your parcel:
What the Henrietta 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-1-20 Residential District | 0.4591 ac | 60 / 8 / 10 ft | — | No |
| R-1-15 Residential District | 0.3444 ac | 40 / 8 / 10 ft | — | No |
| R-2-15 Residential District | 0.2755 ac | 40 / 8 / 10 ft | — | No |
| Rural Residential (RR) — lots with central water and sewer | 2 ac | 30 / 10 / 30 ft | — | No |
| Rural Residential (RR) — lots without central water and sewer | 5 ac | 40 / 10 / 40 ft | — | No |
ADUs vs. short-term rentals in Henrietta
No local short-term-rental law on record - which is not the same as permission for Town of Henrietta. No short-term-rental law found in Town of Henrietta Zoning Ch. 295 as of 2026-08-07. The chapter's use tables enumerate boarding houses, group homes and faculty dwellings/dormitories as distinct residential uses — most of them prohibited in the residential districts — but no whole-house transient rental use appears at all. Absence of a found law is not permission. New York State's 2025 STR registry (Ch. 99 of the Laws of 2025) separately requires every host statewide to register. Confirm with Building & Fire Prevention at (585) 359-7060 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 minimum0.2755–5 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityRG&E territory.
- Building dept(585) 359-7060
- Last reviewed2026-08-07
ADU FAQ — Henrietta, NY
Are ADUs allowed in Henrietta, NY?
Town of Henrietta has 5 districts. All districts prohibit ADUs. Check your address with the free ADU checker, or confirm with the building department at (585) 359-7060.
Do I need a special permit for an ADU in Henrietta?
No. No district in Town of Henrietta permits an ADU, so there is no permit to apply for. Codes change, so verify with the building department at (585) 359-7060 before ruling it out.
Can I use an ADU as a short-term rental in Henrietta?
No local short-term-rental law on record - which is not the same as permission for Town of Henrietta. 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 Henrietta
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 Henrietta, priced by size.
More on Henrietta: Full zoning for new construction · ADU build cost · House build cost · All Monroe County towns
ADU information for Town of Henrietta 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) 359-7060 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.