Honeoye Falls · ADU cost
What it costs to build an ADU in Honeoye Falls, NY
An 800 sq ft accessory dwelling unit in Honeoye Falls runs roughly $200k–260k, or about $249–327/sq ft, and that per-square-foot figure sits deliberately above the $204–268/sq ft a full house costs here. An ADU still needs one whole kitchen, one whole bath, its own service panel and its own heating plant no matter how small you draw it, and those costs do not shrink with the floor plan, so they land on half the square footage and push the rate up. Whether the village will let you build one is a separate question from what it costs, and it gets answered parcel by parcel rather than townwide, since the Village of Honeoye Falls maps 4 districts that treat accessory units differently from one another, so read the table below as a starting point rather than a verdict.
ADU cost by size in Honeoye Falls
Standard finish, slab on grade, on a flat and clear part of the lot, general-contractor margin included. These are structure costs at Monroe County pricing, before the service and septic work a second dwelling can trigger.
| Size | Type | $ / sq ft | Estimated total |
|---|---|---|---|
| 400 sq ft | Studio | $331–$433 | $130k–175k |
| 600 sq ft | One bedroom | $276–$362 | $165k–215k |
| 800 sq ft | One bedroom, larger | $249–$327 | $200k–260k |
| 1,000 sq ft | Two bedroom | $233–$305 | $235k–305k |
400 sq ft — One room plus a bath. Garage conversions and small backyard cottages land here.
600 sq ft — The most common detached build - a real bedroom, full kitchen, one bath.
800 sq ft — Room for a proper living area. Still a single bath and one kitchen.
1,000 sq ft — About as large as most codes allow an accessory unit to go.
Why the rate is higher than a house
The systems below are priced for an 800 sq ft unit. The middle column is what each system would cost if it simply shrank with the floor plan; the left column is what it actually costs once you account for the equipment a dwelling needs one of regardless of size. The gap between the two columns is the whole reason small builds price the way they do.
| System | $ / sq ft in an ADU | If it scaled with floor area | Fixed per unit |
|---|---|---|---|
| Site work | $7–$11 | $7 | — |
| Foundation | $16–$23 | $16 | — |
| Framing | $25–$32 | $25 | — |
| Envelope - roof, siding, windows | $32–$41 | $32 | — |
| Plumbing | $28–$34 | $16 | 55% |
| Electrical | $18–$24 | $13 | 35% |
| HVAC | $23–$28 | $15 | 45% |
| Insulation | $7–$9 | $7 | — |
| Interior finishes | $32–$43 | $27 | 15% |
| Millwork & cabinetry | $18–$28 | $11 | 55% |
The fixed-per-unit share is a modeling assumption, not a figure from the code: it is our estimate of how much of each system's budget buys equipment a dwelling needs exactly one of - a kitchen rough-in, a bath group, a service panel, a heating plant - and therefore does not shrink when the unit does. Site work, foundation, framing, envelope and insulation are treated as scaling straight with floor area, which understates the premium slightly, because a small building carries more envelope per square foot of floor than a large one.
What the Honeoye Falls code says about accessory units
Whether you can build one, and how large, is decided by the district your parcel sits in rather than by the town as a whole. The table shows how each mapped district treats ADUs alongside the lot and setback standards a second unit still has to fit inside. District boundaries and conditions vary, so treat it as a starting point and confirm the district that applies to your parcel.
| District | Min lot | Setbacks F / S / R | Max height | ADU |
|---|---|---|---|---|
| Single-Family Residential (R-1) — 10,000 sf (0.23 acres) for a single-family dwelling with 45 ft of lot width, front yard 15 ft MINIMUM, rear yard 20 ft, maximum height 35 ft (2 1/2 stories) and maximum residential lot coverage 35%. THE SIDE YARD IS TWO NUMBERS AND BOTH BIND: 10 ft for one side AND 25 FT TOTAL FOR BOTH, so a house cannot simply take the 10 ft minimum on each side — the pair must reach 25 ft, forcing at least one side to 15 ft. The recorded 10 is the single-side minimum. This two-part formulation runs through every district here. R-1 IS THE ONLY DISTRICT IN THE VILLAGE THAT BARS A TWO-FAMILY DWELLING, so its sole route to a second unit is an ACCESSORY DWELLING UNIT by special permit; multifamily in either form is barred outright. A bed-and-breakfast, a nursing home or assisted-living facility and a funeral home are special permitted. THE 15 FT FRONT YARD IS THE SHALLOWEST IN THE VILLAGE and, with a 45 ft lot width, produces a tight traditional village lot rather than a suburban one. WITHOUT PUBLIC SEWERS THE MINIMUM LOT RISES TO 24,000 SF — a separate row in the lot-and-yard table — but that case is largely theoretical inside an incorporated village on public sewer and the recorded 10,000 sf is the serviced figure. Accessory structures take 3 ft side and rear yards and a 24 ft height cap which may not exceed the height of the principal structure on the lot. | 0.2296 ac | 15 / 10 / 20 ft | 35 ft | Special permit |
| Transitional Residential (R-2) — 10,000 sf (0.23 acres) for a single-family dwelling with 45 ft of lot width, front yard 15 ft minimum, side yard 10 ft for one and 25 ft total for both, rear yard 20 ft, height 35 ft (2 1/2 stories) and maximum residential lot coverage 35%. DIMENSIONALLY R-2 IS IDENTICAL TO R-1 IN EVERY FIGURE — same lot area, same width, same yards, same height, same coverage — AND THAT IS VERIFIED, NOT AN EXTRACTION ERROR. What separates the two districts is entirely the use list, which is what 'transitional' means here: R-2 permits a TWO-FAMILY DWELLING, attached or detached, BY RIGHT where R-1 bars it, and adds MULTIFAMILY BY CONVERSION by special permit, a nursing home or assisted-living facility by special permit, and retains the accessory dwelling unit by special permit. So an R-2 parcel and an R-1 parcel of the same size have the same envelope but very different capacity — the second unit in R-2 needs no permit at all. THE LOT MINIMUM CHANGES WITH THE USE and the recorded figure is the single-family row: a two-family dwelling requires 12,000 sf, and a multifamily dwelling runs on 4,000 SQUARE FEET PER DWELLING UNIT — the lowest per-unit figure of any district in this village and lower than R-3's own 5,000 — with a 65 ft lot width. Without public sewers the minimum rises to 24,000 sf. A nonresidential use requires 12,000 sf and 65 ft of width. Accessory structures take 3 ft side and rear yards and a 24 ft height cap. | 0.2296 ac | 15 / 10 / 20 ft | 35 ft | Special permit |
| Multifamily Residential (R-3) — 10,000 sf (0.23 acres) for a single-family dwelling with 65 ft of lot width, side yard 12 ft for one and 30 ft total for both, rear yard 20 ft, height 35 ft (2 1/2 stories), maximum residential lot coverage 35% and, uniquely alongside R-4, A MINIMUM OPEN SPACE REQUIREMENT OF 35%. THE FRONT YARD IS A RANGE, NOT A MINIMUM, AND THIS IS THE ONLY DISTRICT IN THE VILLAGE WHERE IT IS: 20 FT MINIMUM AND 40 FT MAXIMUM, so a deep front setback is non-conforming in R-3 and a building must hold the street edge. Only the 20 ft floor is recorded. R-3 IS THE VILLAGE'S DENSITY DISTRICT AND IT PERMITS THE MOST BY RIGHT: a two-family dwelling, multifamily new construction and multifamily by conversion are all scored P, along with a nursing home or assisted-living facility. IT IS ALSO THE ONLY DISTRICT WITH NO ACCESSORY DWELLING UNIT ROUTE AND NO BED-AND-BREAKFAST — both are em dashes — which is the deliberate inversion described in `aduNotes`: where multifamily is available by right the accessory route is withdrawn. MULTIFAMILY RUNS ON 5,000 SQUARE FEET PER DWELLING UNIT with an 80 ft lot width, so a six-unit building needs 30,000 sf, three times the recorded single-family minimum; note that R-2's per-unit figure is LOWER at 4,000 sf, so R-3 is not uniformly the densest district on a per-unit basis. Without public sewers the minimum rises to 30,000 sf. Accessory structures take 10 ft side and rear yards here — more than triple R-1's and R-2's 3 ft — and a 24 ft height cap. | 0.2296 ac | 20 / 12 / 20 ft | 35 ft | No |
| Village Residential (R-4) — THE LOT SIZE, LOT WIDTH AND FRONT YARD ARE NOT STATED AS NUMBERS AT ALL AND minLotSize IS NULL BY DESIGN. Every one of those cells reads 'SPR', which the table's own note defines as 'lot sizes to be approved in SUBDIVISION AND SITE PLAN REVIEW', adding the unusual requirement that 'A VARIETY OF LOT SIZES SHALL BE REQUIRED'. So R-4 is a negotiated district: there is no as-of-right envelope to underwrite from, and the Village will actively resist a uniform subdivision. Maximum building height is likewise SPR rather than the 35 ft that applies elsewhere, so even the height is set at approval — 35 is recorded as the village-wide norm for orientation only and must not be relied on. WHAT IS FIXED IN R-4 IS THE YARD AND COVERAGE SET: side yard 12 ft for one and 30 ft total for both, rear yard 20 ft, maximum residential lot coverage 35% and A MINIMUM OPEN SPACE REQUIREMENT OF 45%, the highest in the village. That 45% open-space floor is the real constraint on an R-4 scheme and will usually bind before the 35% coverage cap. R-4 IS THE VILLAGE'S BROADEST USE LIST: a single-family dwelling and a two-family dwelling are permitted by right, multifamily new construction is special permitted, an accessory dwelling unit is special permitted, a bed-and-breakfast is special permitted, and R-4 is the ONLY district in the village admitting a MANUFACTURED HOME PARK, by special permit on a 5-ACRE minimum. Without public sewers a nonresidential lot rises to 30,000 sf. Accessory structures take 3 ft side and rear yards and a 24 ft height cap. | — | - / 12 / 20 ft | 35 ft | Special permit |
Costs an ADU adds that a house does not
- Septic and water A second dwelling adds bedrooms to the design flow, which on an unsewered parcel often means expanding or replacing the existing system rather than tapping it. This is the single most common reason an ADU budget moves after design, and it is site-specific enough that no model should quote it - get it evaluated early.
- Utility service RG&E territory. A detached unit needs power run to it, and whether it goes on its own meter or subfeeds the main house changes both the cost and the permit path.
- Access and parking Many codes require an added parking space for the accessory unit, and a detached unit usually needs a driveway extension or a path, both of which count against a lot-coverage or impervious-surface cap.
- Short-term rentalsNo local short-term-rental law on record - which is not the same as permission. NO SHORT-TERM RENTAL PROVISION EXISTS IN THE VILLAGE OF HONEOYE FALLS ZONING CODE. The § 190-15 residential use matrix scores every land use across R-1, R-2, R-3 and R-4 and contains no short-term rental row, and a sweep of all 54 chapters of the Village Code found no standalone rental, lodging, licensing or registration chapter. WHAT EXISTS IS A BED-AND-BREAKFAST, SPECIAL PERMITTED IN R-1, R-2 AND R-4 BUT BARRED OUTRIGHT IN R-3 — the multifamily district is the one place a bed-and-breakfast may not go, which is the same kind of inversion this village applies to its accessory dwelling unit. A bed-and-breakfast is an owner-present lodging use and must not be read as authorising a whole-house short-term rental. THE USE TABLE IS A CLOSED MATRIX scored P, SP or em dash, so an unlisted whole-house STR is barred rather than merely unaddressed; strStatus stays 'unknown' rather than 'prohibited' only because that reading is unconfirmed with the Village. NOTE THE DIVERGENCE FROM THE SURROUNDING TOWN OF MENDON, WHICH IS THE SHARPEST TOWN-VILLAGE SPLIT FOUND IN THIS COUNTY: Mendon operates a full standalone STR OPERATING-PERMIT REGIME in its Ch. 208, with one-year and two-year terms, a 31 December expiry and nontransferability on sale. The village inside it has nothing of the kind. A Mendon STR finding is worthless for a Honeoye Falls parcel and the reverse, which is exactly the hazard already seen with Pittsford town versus village. New York State's 2025 statewide short-term rental registry (Ch. 99 of the Laws of 2025) obliges every host to register regardless of local law. Confirm with Code Enforcement at (585) 624-6150. Separate question from whether you can build the unit.
- Building dept(585) 624-6150
Sizing up a specific parcel in Honeoye Falls?
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Building a full house instead?
A standard-finish house in Honeoye Falls runs $204–268/sq ft, about $370k–480k at 1,800 sq ft . See what it costs to build a house in Honeoye Falls.
ADU cost in nearby towns
All Monroe County towns: Rochester (City) · Brighton · Chili · Clarkson · Gates · Greece · Hamlin · Henrietta · Irondequoit · Mendon · Ogden · Parma · Penfield · Perinton · Pittsford · Riga · Rush · Sweden · Webster · Wheatland · Town/Village of East Rochester (Village) · Brockport (Village) · Churchville (Village) · Fairport (Village) · Hilton (Village) · Pittsford (Village) · Scottsville (Village) · Spencerport (Village) · Webster (Village)
More on Honeoye Falls: Can you build an ADU here? · Zoning for new construction · Monroe County build cost
ADU cost in Honeoye Falls: common questions
How much does it cost to build an ADU in Honeoye Falls, NY?
An 800 sq ft accessory dwelling unit in Village of Honeoye Falls runs roughly $200k–260k at a standard finish, general-contractor margin included. A 400 sq ft studio runs about $130k–175k. Those are structure costs on an easy site and do not include the septic, water or electrical service work a second unit often triggers.
Why does an ADU cost more per square foot than a house in Honeoye Falls?
Because a lot of a dwelling's cost is per dwelling, not per square foot. One kitchen, one bath group, one service panel and one heating plant cost about the same in an 800 sq ft cottage as in a 1,800 sq ft house, so on the smaller unit they get spread over less than half the floor area. That is why an ADU here prices at $249–327/sq ft against $204–268/sq ft for a full house, even though it is the same trades doing the same work.
Are ADUs allowed in Honeoye Falls?
Village of Honeoye Falls has 4 districts. 3 districts allow ADUs with a special-use permit, 1 does not. Check the specific address with the free ADU checker or confirm with the building department at (585) 624-6150 before you spend money on design.
Can I rent an ADU in Honeoye Falls short term?
No local short-term-rental law on record - which is not the same as permission for Village of Honeoye Falls. ADU rules and short-term-rental rules are set separately, so a unit you are allowed to build is not automatically one you are allowed to rent nightly. Confirm both before you underwrite the build on short-term-rental income.
ADU costs are modeled estimates in current 2026 dollars at the Monroe County regional index, general-contractor margin included, derived from Offsite's cost engine with a stated adjustment for the equipment a dwelling needs one of regardless of size. They are planning numbers for decision-support only - not a bid, quote, or guarantee, and not legal, architectural or engineering advice. They cover the structure and exclude septic expansion, utility service runs, site work beyond a flat and clear pad, and permit fees. ADU eligibility, size, owner-occupancy and permit conditions in the Village of Honeoye Falls vary by district and often carry exceptions this page does not show; zoning last reviewed 2026-08-13; verify with the building department at (585) 624-6150 before relying on any answer. Sources: Offsite / Aldo cost engine (costEngine.js + constants.js); zoning dataset (municipalData.js).