ADU · Erie County
Can you build an ADU in West Seneca, NY?
Town of West Seneca has 9 districts. All districts prohibit ADUs. Check your address to confirm the district that applies to your parcel:
What the West Seneca 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 District R-100A | 0.459 ac | 40 / 10 / 50 ft | 30 ft | No |
| Residential District R-90 | 0.275 ac | 30 / 10 / 30 ft | 30 ft | No |
| Residential District R-90A | 0.275 ac | 40 / 10 / 30 ft | 30 ft | No |
| Residential District R-75 | 0.23 ac | 30 / 5 / 30 ft | 30 ft | No |
| Residential District R-75A | 0.23 ac | 40 / 5 / 30 ft | 30 ft | No |
| Residential District R-65 | 0.195 ac | 30 / 5 / 30 ft | 30 ft | No |
| Residential District R-65A | 0.195 ac | 40 / 5 / 30 ft | 30 ft | No |
| Residential District R-60A | 0.23 ac | 40 / 5 / 30 ft | 30 ft | No |
| Residential District R-50 | 0.184 ac | 30 / 5 / 30 ft | 30 ft | No |
ADUs vs. short-term rentals in West Seneca
Short-term rentals allowed with local rules for Town of West Seneca. Short-term rentals require a Town permit and licence under Chapter 95, Part 2, Short-Term Rentals, adopted 2-13-2023 by L.L. No. 2-2023. § 95-16 lists prohibited practices, § 95-17 the regulations, § 95-18 the approval process and §§ 95-19 through 95-23 permit expiry, transfer, revocation, notice and appeals. 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 West Seneca at (716) 558-3242 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 minimum0.184–0.459 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityNational Grid territory.
- Building dept(716) 558-3242
- Last reviewed2026-08-06
ADU FAQ — West Seneca, NY
Are ADUs allowed in West Seneca, NY?
Town of West Seneca has 9 districts. All districts prohibit ADUs. Check your address with the free ADU checker, or confirm with the building department at (716) 558-3242.
Do I need a special permit for an ADU in West Seneca?
No. No district in Town of West Seneca permits an ADU, so there is no permit to apply for. Codes change, so verify with the building department at (716) 558-3242 before ruling it out.
Can I use an ADU as a short-term rental in West Seneca?
Short-term rentals allowed with local rules for Town of West Seneca. 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 West Seneca
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 West Seneca, priced by size.
More on West Seneca: Full zoning for new construction · ADU build cost · House build cost · All Erie County towns
ADU information for Town of West Seneca is compiled from the municipal code (last reviewed 2026-08-06) 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 (716) 558-3242 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.