Churchville · ADU cost
What it costs to build an ADU in Churchville, NY
An 800 sq ft accessory dwelling unit in Churchville 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 Churchville maps 3 districts that treat accessory units differently from one another, so read the table below as a starting point rather than a verdict.
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ADU cost by size in Churchville
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 Churchville 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 |
|---|---|---|---|---|
| Low Density Residential | 0.28 ac | 35 / 8 / 25 ft | 35 ft | Special permit |
| Traditional Village Residential | 0.18 ac | 20 / 8 / 25 ft | 35 ft | Special permit |
| Mixed Density Residential | 0.23 ac | 25 / 10 / 30 ft | 35 ft | No |
Low Density Residential - Any front, side or rear yard may instead follow the most common yard space on the block, within a margin of plus or minus one foot.
- A nonresidential use takes 20,000 sq ft on 80 ft of width, with a 15 ft side yard and a 35 ft rear yard.
- A municipal structure, place of worship, public park, public utility and school are permitted by right; a nursing home, day-care facility and bed-and-breakfast each need a special permit.
- Only a single-family dwelling is permitted; two-family, townhome and multifamily dwellings are prohibited, and an additional unit is possible only as an accessory dwelling unit on a special permit.
- Accessory structures need an 8 ft side yard and a 5 ft rear yard and are capped at 15 ft in height.
Traditional Village Residential - Any front, side or rear yard may instead follow the most common yard space on the block, within a margin of plus or minus one foot.
- A two-family dwelling or townhome takes 10,000 sq ft rather than the 8,000 a single-family needs, on the same 50 ft of width, and needs a special permit.
- A multifamily dwelling is stated per dwelling unit at 5,500 sq ft each on 70 ft of width, with no flat lot minimum, so an acre supports about 7 units before the coverage cap is tested.
- A nonresidential use takes 20,000 sq ft on 80 ft of width, with a 15 ft side yard and a 35 ft rear yard.
- Multifamily buildings are limited to under five units; a building of five to twelve units is prohibited.
- Accessory structures need an 8 ft side yard and a 5 ft rear yard and are capped at 15 ft in height.
Mixed Density Residential - Any front, side or rear yard may instead follow the most common yard space on the block, within a margin of plus or minus one foot.
- A two-family dwelling or townhome takes 12,000 sq ft rather than the 10,000 a single-family needs, on the same 60 ft of width, so the second unit costs 2,000 sq ft of land.
- A multifamily dwelling is stated per dwelling unit at 5,500 sq ft each on 70 ft of width, with no flat lot minimum, and nothing above twelve units is permitted anywhere in the village.
- A nonresidential use takes 20,000 sq ft on 80 ft of width, with a 15 ft side yard and a 35 ft rear yard.
- A two-family dwelling or townhome and a multifamily building of under five units are permitted by right, and a building of five to twelve units needs a special permit.
- There is no accessory dwelling unit route in this district.
- Accessory structures need a 10 ft side yard and an 8 ft rear yard and are capped at 15 ft in height.
Size limits on record in Churchville
Where the code states a size cap, it decides which row of the cost table above actually applies to you. These are the caps recorded for Churchville:
- Low Density ResidentialMultifamily in TVR and MDR runs on 5,500 sq ft of land per dwelling unit.
- Traditional Village ResidentialMultifamily in TVR and MDR runs on 5,500 sq ft of land per dwelling unit.
- Mixed Density ResidentialMultifamily in TVR and MDR runs on 5,500 sq ft of land per dwelling unit.
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. The Village of Churchville has no local short-term rental law, and that is not the same as permission. Confirm with the Building Inspector before counting on renting a home short term. Separate question from whether you can build the unit.
- Zoning codeecode360.com/34187694
- Building dept(585) 293-3720 x119
Sizing up a specific parcel in Churchville?
Aldo pulls the exact zoning district, setbacks, and build feasibility for any parcel — before you buy. Enter your email to open Aldo and run your free report.
Building a full house instead?
A standard-finish house in Churchville runs $204–268/sq ft, about $370k–480k at 1,800 sq ft . See what it costs to build a house in Churchville.
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 · East Rochester (Village) · Brockport (Village) · Fairport (Village) · Hilton (Village) · Honeoye Falls (Village) · Pittsford (Village) · Scottsville (Village) · Spencerport (Village) · Webster (Village)
More on Churchville: Can you build an ADU here? · Zoning for new construction · Monroe County build cost
ADU cost in Churchville: common questions
How much does it cost to build an ADU in Churchville, NY?
An 800 sq ft accessory dwelling unit in Village of Churchville 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 Churchville?
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 Churchville?
Village of Churchville has 3 districts. 2 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) 293-3720 x119 before you spend money on design.
Can I rent an ADU in Churchville short term?
No local short-term-rental law on record - which is not the same as permission for Village of Churchville. 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 Churchville 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) 293-3720 x119 before relying on any answer. Sources: the Offsite / Aldo cost engine and zoning dataset.