ADU · Westchester County
Can you build an ADU in Harrison, NY?
City of Harrison has 19 districts. All districts prohibit ADUs. Check your address to confirm the district that applies to your parcel:
What the Harrison 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 |
|---|---|---|---|---|
| One-Family Residence | 1 ac | — | 30 ft | No |
| One-Family Residence | 0.5 ac | — | 30 ft | No |
| One-Family Residence | 2 ac | — | 30 ft | No |
| One-Family Residence | 0.3333 ac | — | 26 ft | No |
| One-Family Residence | 2.5 ac | — | 30 ft | No |
| One-Family Residence | 0.1722 ac | — | 26 ft | No |
| One-Family Residence | 0.1148 ac | — | 26 ft | No |
| Two-Family Residence | 0.1148 ac | — | 26 ft | No |
| Garden Apartment | 1.8365 ac | — | 26 ft | No |
| Multifamily Residence | 0.0918 ac | — | 45 ft | No |
| Multifamily Limited Retail | 0.0918 ac | — | 50 ft | No |
| Special Business | 5 ac | — | 55 ft | No |
| Special Business | 5 ac | — | 65 ft | No |
| Special Business | 100 ac | — | 55 ft | No |
| Special Business | 35 ac | — | 55 ft | No |
| Central Business | — | — | 45 ft | No |
| General Commercial | — | — | 35 ft | No |
| Neighborhood Business | — | — | 35 ft | No |
| Professional Business | — | — | 35 ft | No |
ADUs vs. short-term rentals in Harrison
No local short-term-rental law on record - which is not the same as permission for City of Harrison. No local STR ordinance found as of Jun 2026; standard zoning codes apply. Westchester County hotel occupancy tax (3%) applies to short-term stays. 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 minimum0.0918–2.5 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityCon Edison territory.
- Building dept(914) 670-3050
- Last reviewed2026-06-08
ADU FAQ — Harrison, NY
Are ADUs allowed in Harrison, NY?
City of Harrison has 19 districts. All districts prohibit ADUs. Check your address with the free ADU checker, or confirm with the building department at (914) 670-3050.
Do I need a special permit for an ADU in Harrison?
No. No district in City of Harrison permits an ADU, so there is no permit to apply for. Codes change, so verify with the building department at (914) 670-3050 before ruling it out.
Can I use an ADU as a short-term rental in Harrison?
No local short-term-rental law on record - which is not the same as permission for City of Harrison. 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 Harrison
Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $235k–310k 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 Harrison, priced by size.
More on Harrison: Full zoning for new construction · ADU build cost · House build cost · All Westchester County towns
ADU information for City of Harrison is compiled from the municipal code (last reviewed 2026-06-08) 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 (914) 670-3050 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.