Pittsford · ADU cost
What it costs to build an ADU in Pittsford, NY
An 800 sq ft accessory dwelling unit in Pittsford 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 town 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 Town of Pittsford maps 7 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 Pittsford
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 Pittsford 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 |
|---|---|---|---|---|
| Residential Neighborhood | — | - / 10 / 10 ft | 30 ft | No |
| B Residential | 0.37 ac | 50 / 15 / 10 ft | 30 ft | No |
| Rural Residential | 0.73 ac | 70 / 20 / 10 ft | 40 ft | No |
| Rural Residential South Pittsford | 5 ac | 70 / 20 / 50 ft | 40 ft | No |
| Suburban Residential | — | — | 30 ft | No |
| Agricultural | 1 ac | 70 / 20 / 10 ft | 40 ft | No |
| Monroe Avenue Transitional Zone | 1.03 ac | 70 / 15 / 35 ft | 30 ft | No |
Residential Neighborhood - Lot area, lot width and the front setback are set parcel by parcel in a town database held by the Planning Department, and the front of a new house must sit within 10 feet of the building line set for that lot.
- The combined side yard grows with lot width, from 15 ft under 60 ft wide to 120 ft above 225 ft wide, and the one-side minimum may be used on one side only.
- The footprint is also capped by a sliding scale tied to lot size, starting at 29% of a lot under 10,000 sq ft, alongside the 40% coverage cap.
- The rear 10 ft is a buffer across the full width where no structure may stand except a fence or garden shed.
- The Design Review and Historic Preservation Board may raise the height to 40 ft where it fits the neighbourhood.
- A flag lot created after 22 October 2012 takes 60 ft on the front, the sides and the rear buffer; one created before takes 20 ft side and rear setbacks.
- A stamped survey showing a different lot width or lot size governs over the town's figures.
B Residential - B is the only district in the town where two-family dwellings and apartment houses are permitted by right rather than by special permit. No more than one residential building may stand on any one lot.
- An apartment house needs a full acre, 1 acre at minimum, and then 2,850 sq ft of lot area for each dwelling unit, against the 16,000 sq ft a single- or two-family dwelling takes.
- It is capped at 8 dwelling units whatever the lot size, which binds before the per-unit figure: an acre allows 15 units on that arithmetic and the cap allows eight.
- Each unit needs at least 700 sq ft of livable floor space and a separate bathroom, plus 150 sq ft for each bedroom beyond the first.
- The rear setback rises from 10 ft to 20 ft for an apartment house, the front stays at 50 ft and the side at 15 ft, and two apartment houses must stand at least 40 ft apart.
- Public water, storm and sanitary sewers are required, and the whole is subject to site plan review under Article XXIX.
- A single-family or two-family home takes the same lot standards.
Rural Residential - The figures shown apply to a parcel of less than 10 acres. A parcel of 10 acres or more develops at one dwelling per ten acres under § 185-32 unless it is clustered, which restores one unit per acre.
- A cluster under § 185-32 restores the density to 1.0 dwelling units per acre and raises lot coverage on the resulting lots from 33% to 40%.
- In exchange, dwellings may occupy at most 35% of the base site area and at least 65% must be permanently designated rural conservation under an easement running to the Town.
- Conservation land is limited to crop agriculture, with horses kept and pastured but no livestock farming, dedicated park and recreation, and open space, and no structure but a fence may stand on it.
- A parcel means the tax parcel or contiguous parcels in single ownership as of 13 January 1986, and no parcel may be reconfigured after that date to apply or avoid these restrictions.
- Single-family attached dwellings are permitted with no more than four attached units per building and one dwelling unit per lot.
Rural Residential South Pittsford - The figures shown apply to a parcel of 5 acres or more but under 20 acres, where a cluster subdivision under § 278 is prohibited, so a holding of that size has no route to smaller lots.
- On 20 acres or more density is bought with conservation: no set-aside gives 0.20 units per acre on five-acre lots, and a 40% set-aside gives 0.5 units per acre on one-acre lots at 25% impervious.
- A 50% set-aside gives 0.75 units per acre at 33% impervious, and a 65% set-aside 1.0 units per acre at 40% impervious, five times the baseline, with no lot dimensions stated at either rung.
- A pre-existing nonconforming lot under 5 acres but over 16,000 sq ft may take one dwelling, on a 125 ft width with 70 ft front, 20 ft side and 10 ft rear setbacks and the same 1,800 sq ft floor area.
- The lot width is the front property line width, measured parallel with the highway.
- The 15% coverage cap is stated as lot coverage in § 185-33.5 and as impervious coverage in the § 185-33.6 table.
Suburban Residential - All residential development here must be processed by the Planning Board as a cluster development under § 278 of the Town Law, so a conventional subdivision is not available. Lot area, width and setbacks are settled by the Planning Board at that review.
- Dwellings may occupy at most 70% of the land within the parcel.
- At least 30% of the base site area must be permanently designated rural conservation under a recorded conservation easement.
- The number of units comes from the Town's site capacity calculation worksheet, not from the density alone.
- Conservation land is limited to crop agriculture, the keeping of horses, dedicated park and recreation, and open space; livestock farming is excluded.
- Single-family attached dwellings are permitted with no more than four attached units per building and one dwelling unit per lot.
Agricultural - The district sets no minimum lot area: the 1 acre shown is a density of one dwelling per acre on a parcel of two acres or more, and a parcel under two acres gets a single dwelling.
- A structure in a farmstead is held to 60 ft of height rather than 40 ft, and silos and grain elevators may reach 80 ft; the setbacks are unchanged.
- Structures on land designated a farmstead in a recorded conservation easement are limited to the types that easement allows, and agricultural accessory structures answer to § 185-11.2.
- A buffer must be kept between homes and any adjoining agricultural use, sized and landscaped as the Planning Board directs at subdivision review.
Monroe Avenue Transitional Zone - A wooded landscape buffer applies on top of the setbacks, 35 ft in front, 15 ft at the sides and 20 ft at the rear, where no tree or shrub may be trimmed or removed without a Landscape Alteration Permit.
- The 150 ft figure is both a minimum lot width and a minimum road frontage.
- Only one primary structure may stand on a lot.
- A walk and a driveway are excluded from the front buffer, and routine seasonal maintenance and minimal clearing for utility connections need no permit.
- The Planning Board may require larger buffers at site plan review to screen parking or refuse storage.
- Facade and site changes must conform to the Monroe Avenue Design Guidelines of 2 April 2002, kept on file with the Town Clerk rather than printed in the code.
Size limits on record in Pittsford
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 Pittsford:
- Residential NeighborhoodAn apartment house in B requires at least one acre and 2,850 square feet of lot area per unit (§ 185-27C). Code enforcement can be reached at (585) 248-6265.
- B ResidentialAn apartment house in B requires at least one acre and 2,850 square feet of lot area per unit (§ 185-27C). Code enforcement can be reached at (585) 248-6265.
- Rural ResidentialAn apartment house in B requires at least one acre and 2,850 square feet of lot area per unit (§ 185-27C). Code enforcement can be reached at (585) 248-6265.
- Rural Residential South PittsfordAn apartment house in B requires at least one acre and 2,850 square feet of lot area per unit (§ 185-27C). Code enforcement can be reached at (585) 248-6265.
- Suburban ResidentialAn apartment house in B requires at least one acre and 2,850 square feet of lot area per unit (§ 185-27C). Code enforcement can be reached at (585) 248-6265.
- AgriculturalAn apartment house in B requires at least one acre and 2,850 square feet of lot area per unit (§ 185-27C). Code enforcement can be reached at (585) 248-6265.
- Monroe Avenue Transitional ZoneAn apartment house in B requires at least one acre and 2,850 square feet of lot area per unit (§ 185-27C). Code enforcement can be reached at (585) 248-6265.
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 Town of Pittsford has no local short-term rental law. That is not the same as permission: its residential districts are closed lists of uses, so an unlisted use is not automatically allowed. Confirm with code enforcement before counting on rental income. Separate question from whether you can build the unit.
- Zoning codeecode360.com/6435505
- Building dept(585) 248-6265
Sizing up a specific parcel in Pittsford?
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 Pittsford runs $204–268/sq ft, about $370k–480k at 1,800 sq ft , plus roughly $10,173 for a conforming lot. See what it costs to build a house in Pittsford.
ADU cost in nearby towns
All Monroe County towns: Rochester (City) · Brighton · Chili · Clarkson · Gates · Greece · Hamlin · Henrietta · Irondequoit · Mendon · Ogden · Parma · Penfield · Perinton · Riga · Rush · Sweden · Webster · Wheatland · East Rochester (Village) · Brockport (Village) · Churchville (Village) · Fairport (Village) · Hilton (Village) · Honeoye Falls (Village) · Pittsford (Village) · Scottsville (Village) · Spencerport (Village) · Webster (Village)
More on Pittsford: Can you build an ADU here? · Zoning for new construction · Monroe County build cost
ADU cost in Pittsford: common questions
How much does it cost to build an ADU in Pittsford, NY?
An 800 sq ft accessory dwelling unit in Town of Pittsford 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 Pittsford?
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 Pittsford?
Town of Pittsford has 7 districts. All districts prohibit ADUs. Check the specific address with the free ADU checker or confirm with the building department at (585) 248-6265 before you spend money on design.
Can I rent an ADU in Pittsford short term?
No local short-term-rental law on record - which is not the same as permission for Town of Pittsford. 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 Town of Pittsford vary by district and often carry exceptions this page does not show; zoning last reviewed 2026-08-11; verify with the building department at (585) 248-6265 before relying on any answer. Sources: the Offsite / Aldo cost engine and zoning dataset.