ADU · Delaware County
Can you build an ADU in Middletown, NY?
Town of Middletown has 7 districts. 5 districts allow ADUs, 1 does not. 1 district has incomplete data - verify with the building department. Check your address to confirm the district that applies to your parcel:
What the Middletown code says
Under § 548 a guest home, the town's accessory dwelling unit, carries no owner-occupancy rule, and its occupants may be unrelated to the owner. Each dwelling needs its own approved well and septic system before the building permit.
Conditions the code attaches:
- On a primary dwelling smaller than about 782 sq ft, no guest home size meets both the 80% and 625 sq ft rules.
- Much of the town drains to the Pepacton Reservoir, where New York City septic rules apply on top of the county health department's.
- There is no annual affidavit, family-relationship requirement or no-rent covenant.
- The code does not say whether a guest home may also be registered as a § 549 tourist home.
What the Middletown 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 |
|---|---|---|---|---|
| Rural III | 3 ac | 50 / 20 / 20 ft | 40 ft | As of right |
| Rural V | 5 ac | 50 / 30 / 30 ft | 40 ft | As of right |
| Business Commercial | 0.46 ac | 50 / 15 / 15 ft | 40 ft | — |
| Hamlet I | 1 ac | 10 / 10 / 10 ft | 40 ft | As of right |
| Hamlet One-Half | 0.5 ac | 10 / 10 / 10 ft | 40 ft | As of right |
| Industrial | — | 50 / 50 / 50 ft | 50 ft | No |
| Development Limitations Overlay | — | — | 40 ft | As of right |
Rural III - R-3 covers land within 500 ft of a state or county highway shown on the district map, with direct frontage and access; land on a town road falls in R-5. If any part of the parcel carries a development limitation, § 410H doubles the lot minimum and adds 50 ft of frontage.
- The front setback is 75 ft from the road center line and at least 25 ft from the right-of-way. The 50 ft shown assumes a 50 ft right-of-way.
- On a narrower right-of-way the front setback grows; on a wider one it shrinks toward the 25 ft floor.
- The lot depth-to-width ratio may not exceed 4:1.
Rural V - R-5 takes in all land not in another district, generally most of the town. If any part of the parcel carries a development limitation, § 410H doubles the lot minimum and adds 50 ft of frontage.
- The front setback is 75 ft from the road center line, with no floor measured from the right-of-way. The 50 ft shown assumes a 50 ft right-of-way.
- On a hundred-foot right-of-way the front setback comes to 25 ft from the lot line, and nothing stops it going lower on a wider one.
- The lot depth-to-width ratio may not exceed 4:1.
Business Commercial - The minimum lot is 20,000 sq ft only with both public water and public sewer; without them it is 40,000 sq ft. BC runs along Route 28 from the Village of Margaretville line east to the Delaware and Ulster Railroad recreational complex in Arkville.
- One-family and two-family dwellings are permitted outright, and multifamily needs site plan review.
- If any part of the parcel carries a development limitation, § 410H doubles the lot minimum and adds 50 ft of frontage.
- The front setback is 75 ft from the road center line and at least 25 ft from the right-of-way. The 50 ft shown assumes a 50 ft right-of-way.
- On a narrower right-of-way the front setback grows; on a wider one it shrinks toward the 25 ft floor.
- The lot depth-to-width ratio may not exceed 4:1.
Hamlet I - Front, side and rear setbacks in H-1 must each be at least the average of the two closest parcels in the district with buildings on the same side of the road, so the 10 ft shown is only the floor. Lot coverage may not exceed the average of those same two parcels.
- H-1 covers the hamlets of New Kingston, Halcottsville, Dunraven, Kelly Corners and Clovesville, and the part of Arkville not in BC, I or H-1/2.
- If any part of the parcel carries a development limitation, § 410H doubles the lot minimum and adds 50 ft of frontage.
Hamlet One-Half - H-1/2 covers only the residential parts of Arkville served by both public water and sewer, so a parcel without both is not in it. Each setback must be at least the average of the two closest parcels in the district with buildings on the same side of the road, with a 10 ft floor.
- Lot coverage may not exceed the average lot coverage of those same two parcels.
- If any part of the parcel carries a development limitation, § 410H doubles the lot minimum and adds 50 ft of frontage.
Industrial - One one-family and one two-family dwelling per lot are permitted outright. The code sets no minimum lot size, so 100 ft of frontage and 50 ft yards on every side are what size a lot here.
- If any part of the parcel carries a development limitation, § 410H doubles the lot minimum and adds 50 ft of frontage.
- The district covers the industrial park along the Arkville cut-off road and several adjacent properties.
Development Limitations Overlay - DL doubles the minimum lot size of the district beneath it and adds 50 ft to its required frontage, wherever the overlay reaches and with no threshold.
- Under DL, R-5 land needs ten acres and 300 ft of frontage, and R-3 land needs six acres and 250 ft.
- Under DL, H-1 land needs two acres and 100 ft of frontage, and H-1/2 land needs one acre and 100 ft.
- Front, side and rear setbacks, lot coverage and the depth-to-width ratio are the same as in the underlying district.
ADUs vs. short-term rentals in Middletown
Short-term rentals allowed with registration for Town of Middletown. Before advertising a tourist home, the owner must register with the Town Building and Zoning Department and schedule a fire inspection. Occupancy is capped at nine persons for the whole property, and stays may not exceed two weeks at a time. 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 minimum0.5–5 ac — an ADU still has to fit the district's lot and setback envelope.
- Zoning codewww.townofmiddletowndelcony.gov/s/Zoning-Ordinance-2021.pdf
ADU FAQ — Middletown, NY
Are ADUs allowed in Middletown, NY?
Town of Middletown has 7 districts. 5 districts allow ADUs, 1 does not. 1 district has incomplete data - verify with the building department. Check your address with the free ADU checker.
Do I need a special permit for an ADU in Middletown?
No district in Town of Middletown requires a special-use permit for an ADU - 5 districts allow ADUs, 1 does not. Site-plan review or a building permit may still apply.
Can I use an ADU as a short-term rental in Middletown?
Short-term rentals allowed with registration for Town of Middletown. 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 Middletown
Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $185k–245k 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 Middletown, priced by size.
How we know this
- Sections analyzed
- Zoning Ordinance § 548 Guest Home(s) (Article V Supplementary Regulations); districts at §§ 404–408; use table Schedule I
- Districts confirmed
- 6 of 7 — 1 not yet analyzed, so this page does not answer for it.
- Last reviewed
- Not covered here
- Overlay districts, the zoning map, and any conditions attached to an individual parcel. Size limits and owner-occupancy terms sit in the code section above, not in this summary.
More on Middletown: Full zoning for new construction · ADU build cost · House build cost · ADU rules across Delaware County · All Delaware County towns
ADU information for Town of Middletown is compiled from the municipal code (last reviewed 2026-08-21) 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 municipality before relying on any answer. Source: the Offsite / Aldo zoning dataset.