ADU · Westchester County
Can you build an ADU in Mount Pleasant, NY?
Town of Mount Pleasant has 32 districts. 28 districts prohibit ADUs, 3 allow them with occupancy restrictions. 1 district has incomplete data - verify with the building department at (914) 742-2305. Check your address to confirm the district that applies to your parcel:
What the Mount Pleasant 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 Residential | 0.9183 ac | — | 35 ft | Occupancy restricted |
| Planned Residential Historic Dev. Transitional | 6 ac | — | 40 ft | No |
| Planned Residential Development Transitional | 3 ac | — | 40 ft | No |
| Planned Residential Development Transitional | 4 ac | — | 40 ft | No |
| Planned Residential Development Transitional | 3 ac | — | 35 ft | No |
| Planned Residential Development Transitional | 0.1148 ac | — | 35 ft | No |
| One-Family Residential | 0.2296 ac | — | 35 ft | Occupancy restricted |
| One-Family Residential | 0.4591 ac | — | 35 ft | Occupancy restricted |
| Multifamily Residential | 0.2296 ac | — | 40 ft | No |
| Multifamily Residential | 0.2296 ac | — | 40 ft | No |
| Planned Residential Development Transitional | 2.4 ac | — | 35 ft | No |
| Planned Light Industry | — | — | 40 ft | No |
| General Office Building | 25 ac | — | 65 ft | No |
| Public Utility Office Building | 20 ac | — | 40 ft | No |
| Research Office Building | 25 ac | — | 65 ft | No |
| Office Business | 25 ac | — | 65 ft | No |
| OB-6 | 10 ac | — | 40 ft | No |
| General Commercial | — | — | 45 ft | No |
| Neighborhood Retail | 0.2296 ac | — | 35 ft | No |
| Rural Business | 0.9183 ac | — | 35 ft | No |
| Office Business Transitional | 1 ac | — | 40 ft | No |
| Office Business Transitional | 6 ac | — | 40 ft | No |
| Office Business Transitional | 7 ac | — | 40 ft | No |
| Office Business Transitional | 1 ac | — | 40 ft | No |
| Hawthorne Hamlet | — | — | — | No |
| Valhalla Hamlet | 0.2296 ac | — | 35 ft | No |
| Light Industry | — | — | 40 ft | No |
| Corporate Office Education | 50 ac | — | 45 ft | No |
| Planned Shopping | — | — | — | No |
| Floating Zone | — | — | — | — |
| Hawthorne Hamlet | — | — | — | No |
| Hawthorne Hamlet Core | — | — | — | No |
ADUs vs. short-term rentals in Mount Pleasant
Short-term rentals prohibited for Town of Mount Pleasant. Short-term rentals are BANNED. § 218-20.6 of the Zoning Code, titled 'Short-term rentals prohibited', was added 1-24-2023 by L.L. No. 1-2023 and applies to the rental of properties throughout the Town. The section defines an immediate family member, so an arrangement with relatives may sit outside the prohibition — confirm any such reading with the Town. Tourist homes are treated separately at § 218-56 and motels at § 218-42. 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 Mount Pleasant at (914) 742-2305 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 minimum0.1148–6 ac — an ADU still has to fit the district's lot and setback envelope.
- UtilityCon Edison territory.
- Building dept(914) 742-2305
- Last reviewed2026-06-15
ADU FAQ — Mount Pleasant, NY
Are ADUs allowed in Mount Pleasant, NY?
Town of Mount Pleasant has 32 districts. 28 districts prohibit ADUs, 3 allow them with occupancy restrictions. 1 district has incomplete data - verify with the building department at (914) 742-2305. Check your address with the free ADU checker.
Do I need a special permit for an ADU in Mount Pleasant?
No district in Town of Mount Pleasant requires a special-use permit for an ADU - 28 districts prohibit ADUs, 3 allow them with occupancy restrictions. Site-plan review or a building permit may still apply.
Can I use an ADU as a short-term rental in Mount Pleasant?
Short-term rentals prohibited for Town of Mount Pleasant. 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 Mount Pleasant
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 Mount Pleasant, priced by size.
More on Mount Pleasant: Full zoning for new construction · ADU build cost · House build cost · All Westchester County towns
ADU information for Town of Mount Pleasant is compiled from the municipal code (last reviewed 2026-06-15) 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) 742-2305 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.