Sidney · ADU cost
What it costs to build an ADU in Sidney, NY
An 800 sq ft accessory dwelling unit in Sidney runs roughly $185k–245k, or about $233–305/sq ft, and that per-square-foot figure sits deliberately above the $191–250/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 Sidney maps 6 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 Sidney
Standard finish, slab on grade, on a flat and clear part of the lot, general-contractor margin included. These are structure costs at Delaware County pricing, before the service and septic work a second dwelling can trigger.
| Size | Type | $ / sq ft | Estimated total |
|---|---|---|---|
| 400 sq ft | Studio | $309–$404 | $125k–160k |
| 600 sq ft | One bedroom | $258–$338 | $155k–205k |
| 800 sq ft | One bedroom, larger | $233–$305 | $185k–245k |
| 1,000 sq ft | Two bedroom | $218–$285 | $220k–285k |
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–$10 | $7 | — |
| Foundation | $15–$21 | $15 | — |
| Framing | $24–$30 | $24 | — |
| Envelope - roof, siding, windows | $30–$38 | $30 | — |
| Plumbing | $26–$32 | $15 | 55% |
| Electrical | $17–$22 | $12 | 35% |
| HVAC | $21–$27 | $14 | 45% |
| Insulation | $7–$9 | $7 | — |
| Interior finishes | $30–$40 | $26 | 15% |
| Millwork & cabinetry | $17–$26 | $10 | 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 Sidney 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 |
|---|---|---|---|---|
| Sidney Center Hamlet — the hamlet district and the town’s smallest minimum lot. SERVICE-TIER LOT SIZE, THE FIFTH DELAWARE JURISDICTION WITH ONE: 7,200 sq ft where the lot IS served by sewers but not less than 3,500 sq ft PER DWELLING UNIT, against 20,000 sq ft where it is NOT, and not less than 10,000 sq ft per dwelling unit. The sewered figure (0.1653 acres) is recorded as the base per the county convention, so ESTABLISH THE SERVICE TIER BEFORE USING minLotSize — an unsewered lot needs 2.8x the land. Note the per-dwelling-unit figures are the binding constraint on anything above one unit: a two-family dwelling needs 7,200 sq ft sewered (2 x 3,500 fits inside it) but 20,000 sq ft unsewered. Lot width at building line 75 ft; front yard 25 ft; maximum height two and one-half storeys not to exceed 36 ft. The side and rear yard figures are stated twice over — 10 ft for an ACCESSORY structure and 25 ft for a PRIMARY structure. sideSetback and rearSetback record the 25 ft primary-structure figure, which is the one that governs a house. NO LOT COVERAGE LIMIT is stated for this or any other base district — the only coverage figure in the entire law is the CPD overlay’s 30%, so the null here is correct and must not be filled in from the overlay. Unlike the R and MD districts this one states NO minimum road frontage, so lot width at the building line is the only width constraint. Permitted principal uses are a single-family dwelling, a two-family dwelling, churches and parish houses, public parks and playgrounds not operated for gain, public and accredited non-profit private schools, public libraries, and land or buildings used by the Town or by Delaware County for administration, water supply, sewerage, fire or police. § 603 adds a special-permit route for a small assembly, business or mercantile space with an occupant load of at most 25 people, capped at 500 sq ft with a single room dimension of no more than 30 ft, off-street parking set back 10 ft from property lines and 4 ft from any road right-of-way, no parking on the public shoulder or right-of-way, no offensive odour, noise, smoke, dust, heat, electrical interference or glare detectable beyond the lot lines, and hours no earlier than 7:00 AM or later than 9:00 PM. | 0.1653 ac | 25 / 25 / 25 ft | 36 ft | No |
| Residential District — Article VI-C. Its use list opens by incorporating the SC-R district wholesale (“any use permitted and as regulated in the SC-R District”) and then repeats that list, so the two districts permit the same things and differ only in their dimensions. SERVICE-TIER LOT SIZE, THE FIFTH DELAWARE JURISDICTION WITH ONE: 7,200 sq ft where the lot IS served by sewers but not less than 3,500 sq ft PER DWELLING UNIT, against 20,000 sq ft where it is NOT, and not less than 10,000 sq ft per dwelling unit. The sewered figure (0.1653 acres) is recorded as the base per the county convention, so ESTABLISH THE SERVICE TIER BEFORE USING minLotSize — an unsewered lot needs 2.8x the land. Note the per-dwelling-unit figures are the binding constraint on anything above one unit: a two-family dwelling needs 7,200 sq ft sewered (2 x 3,500 fits inside it) but 20,000 sq ft unsewered. Lot width at building line 100 ft; front yard 40 ft, which is 15 ft deeper than SC-R’s; maximum height two and one-half storeys not to exceed 36 ft. The side and rear yard figures are stated twice over — 10 ft for an ACCESSORY structure and 25 ft for a PRIMARY structure. sideSetback and rearSetback record the 25 ft primary-structure figure, which is the one that governs a house. § 605-C ADDS A SEPARATE MINIMUM ROAD FRONTAGE OF 100 FT (amended 2023-01-13), which here happens to equal the lot width at the building line — do not assume that holds elsewhere in this town, because in RA the two figures differ by 150 ft. No lot coverage limit is stated; the null is correct. Note the two ways this district is easy to confuse: it is not the SC-R hamlet district despite sharing a use list, and it is not the VILLAGE of Sidney, which is a separate jurisdiction with its own eCode360 Chapter 215 and eight districts of its own. | 0.1653 ac | 40 / 25 / 25 ft | 36 ft | No |
| Residential-Agricultural District — Article VII, and the district most Sidney land outside the hamlets falls in. MINIMUM LOT AREA 5 ACRES, amended 2023-01-13; lot width at building line 100 ft; front yard 40 ft; maximum height 36 ft for residential buildings, with FARM STRUCTURES EXPRESSLY EXEMPT FROM ANY HEIGHT LIMIT. The side and rear yard figures are stated twice over — 10 ft for an ACCESSORY structure and 25 ft for a PRIMARY structure. sideSetback and rearSetback record the 25 ft primary-structure figure, which is the one that governs a house. This district states TWO different width figures and they diverge by 150 ft: lot width at the building line is 100 ft, but § 702(6) separately requires a MINIMUM ROAD FRONTAGE OF 250 FT (amended 2023-01-13). minLotWidthFt records the 100 ft lot width because that is the field’s basis and the code’s own term, but on any new lot the 250 ft road-frontage requirement is what actually governs how many lots a road-fronting parcel can yield, and it is 2.5x the recorded figure. On a long thin parcel that requirement, not the 5-acre minimum, is what caps the lot count. USES ARE THE MOST PERMISSIVE IN THE TOWN: § 700 incorporates everything permitted in the R and MD districts and adds agricultural, floricultural and horticultural pursuits including general farms, greenhouses, nurseries, truck gardens, dairies and the raising of bees, poultry and livestock with all customary buildings; forest management; seasonal dwellings; animal hospitals, riding stables, kennels and furbearing animal farms provided pens and runways sit at least 100 ft from any adjoining property line (pasture and exercise tracks excepted); and MULTI-FAMILY DWELLINGS AS A PERMITTED PRINCIPAL USE, which is unusual for a 5-acre rural district and the most permissive residential provision found in this county so far. Private garages may hold up to four commercial vehicles registered to the owner, and such a garage may not exceed 75% of the overall lot width in depth. | 5 ac | 40 / 25 / 25 ft | 36 ft | No |
| Maywood District — Article VI-B, and a genuinely unusual district: § 600-B states that ALL PERMITTED USES WITHIN THE MAYWOOD DISTRICT WILL REQUIRE A SPECIAL USE PERMIT, so nothing here is as-of-right even though the section is headed “Permitted Principal Uses”. MINIMUM LOT SIZE IS NOT A NUMBER: § 601-B(4) sets it as “required to accommodate the proposed property use as determined by the Planning Board during Site Plan Review”, so minLotSize is null by design and no lot width or road frontage is stated either — those nulls are the code’s position, not unread fields. What IS fixed: front yard 25 ft, side and rear 25 ft for primary structures and 10 ft for accessory structures, and a maximum height of 36 ft measured FROM THE LOWEST GROUND ELEVATION, which is a stricter basis than the two-and-a-half-storey formulation used in the residential districts and matters on a sloping site. The district is a small mixed-use node: it incorporates the SC-R use list, then adds by special permit retail business (small), personal service shops, galleries, artist and music studios, cafés, business or professional offices, custom-work shops for trades such as woodworking, plumbing and electrical using only light machines and hand tools, building and farm supply with incidental millwork, feed and solid fuel storage, farm implement sales, service, rental and auctions, utility service buildings and storage yards when fenced, residential or solar installations specific to the business, assisted living facilities, group homes, senior housing and housing for the disabled under NYS Department of Health codes, major home occupations, large wind projects, commercial solar arrays and farms, and commercial recreation establishments. | — | 25 / 25 / 25 ft | 36 ft | No |
| Commercial District — Article VIII. Like the Maywood District it sets NO numeric minimum lot size: § 801(8) makes lot area “minimum lot size as required to accommodate the proposed property use as determined by the Planning Board during Site Plan Review”, so minLotSize, minLotWidthFt and maxLotCoverage are all null by design rather than unread. Front yard 25 ft; side and rear 25 ft for primary structures and 10 ft for accessory structures; maximum height 36 ft measured FROM THE LOWEST GROUND ELEVATION. The practical consequence is that every commercial project in Sidney is a Planning Board site plan review in which the dimensional envelope is set case by case, so there is no schedule to underwrite against and an early conversation with the Board is the only way to size a scheme. Signs in this district confine all advertising to the premises of the business advertised, cap a wall identification sign at two square feet per horizontal foot of the wall it sits on and at 75% of that wall’s width (90% where the wall is 20 ft or less), and allow a maximum 12-inch projection with no part extending above or beyond the wall. | — | 25 / 25 / 25 ft | 36 ft | No |
| Common Plan of Development Overlay — Article V-B, ADDED 2023-12-14 and the newest zoning instrument found in Delaware County. AN OVERLAY, NOT A STANDALONE DISTRICT: height, front setback, and side and rear setbacks are all expressly “same as the underlying district”, which is why those fields are null here. Three things change, and they are strict. MINIMUM LOT SIZE 10 ACRES and MINIMUM FRONTAGE 250 FT — the largest minimum lot in the town by a factor of two against RA’s five acres. MAXIMUM LOT COVERAGE 30%, WHICH IS THE ONLY LOT-COVERAGE FIGURE ANYWHERE IN THE TOWN OF SIDNEY ZONING LAWS; every base district states none. AND READ THE TOWN’S OWN COVERAGE DEFINITION BEFORE APPLYING IT: § 300 defines lot coverage as the portion of the lot covered by the horizontal cross section of all principal AND accessory buildings, PAVED PARKING LOTS, AND OTHER IMPERVIOUS SURFACES — so this 30% is an impervious-surface cap, not a building-footprint cap, exactly as in the Town of Delhi, and on a 10-acre commercial or solar site the parking and access drives consume it fast. Maximum lot depth-to-width ratio 4:1. The front setback carries an additional contextual rule: same as the underlying district, OR, where adjacent lots are developed, no new building line may cross the front plane of the closest buildings on adjacent lots. PROCEDURE IS THE OTHER TEETH: § 506-B requires any application for subdivision, site plan approval or a special use permit within the CPD to notify IN WRITING BY CERTIFIED MAIL every property within 1,000 FEET of the outside border of the parcel, with proof of mailing at time of application — an unusually wide notice radius that adds real time and cost to a schedule. | 10 ac | — | — | No |
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Size limits on record in Sidney
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 Sidney:
- Sidney Center Hamlet — the hamlet district and the town’s smallest minimum lot. SERVICE-TIER LOT SIZE, THE FIFTH DELAWARE JURISDICTION WITH ONE: 7,200 sq ft where the lot IS served by sewers but not less than 3,500 sq ft PER DWELLING UNIT, against 20,000 sq ft where it is NOT, and not less than 10,000 sq ft per dwelling unit. The sewered figure (0.1653 acres) is recorded as the base per the county convention, so ESTABLISH THE SERVICE TIER BEFORE USING minLotSize — an unsewered lot needs 2.8x the land. Note the per-dwelling-unit figures are the binding constraint on anything above one unit: a two-family dwelling needs 7,200 sq ft sewered (2 x 3,500 fits inside it) but 20,000 sq ft unsewered. Lot width at building line 75 ft; front yard 25 ft; maximum height two and one-half storeys not to exceed 36 ft. The side and rear yard figures are stated twice over — 10 ft for an ACCESSORY structure and 25 ft for a PRIMARY structure. sideSetback and rearSetback record the 25 ft primary-structure figure, which is the one that governs a house. NO LOT COVERAGE LIMIT is stated for this or any other base district — the only coverage figure in the entire law is the CPD overlay’s 30%, so the null here is correct and must not be filled in from the overlay. Unlike the R and MD districts this one states NO minimum road frontage, so lot width at the building line is the only width constraint. Permitted principal uses are a single-family dwelling, a two-family dwelling, churches and parish houses, public parks and playgrounds not operated for gain, public and accredited non-profit private schools, public libraries, and land or buildings used by the Town or by Delaware County for administration, water supply, sewerage, fire or police. § 603 adds a special-permit route for a small assembly, business or mercantile space with an occupant load of at most 25 people, capped at 500 sq ft with a single room dimension of no more than 30 ft, off-street parking set back 10 ft from property lines and 4 ft from any road right-of-way, no parking on the public shoulder or right-of-way, no offensive odour, noise, smoke, dust, heat, electrical interference or glare detectable beyond the lot lines, and hours no earlier than 7:00 AM or later than 9:00 PM.Sewered lots need 3,500 sq ft per dwelling unit; unsewered lots need 10,000 sq ft per dwelling unit
- Residential District — Article VI-C. Its use list opens by incorporating the SC-R district wholesale (“any use permitted and as regulated in the SC-R District”) and then repeats that list, so the two districts permit the same things and differ only in their dimensions. SERVICE-TIER LOT SIZE, THE FIFTH DELAWARE JURISDICTION WITH ONE: 7,200 sq ft where the lot IS served by sewers but not less than 3,500 sq ft PER DWELLING UNIT, against 20,000 sq ft where it is NOT, and not less than 10,000 sq ft per dwelling unit. The sewered figure (0.1653 acres) is recorded as the base per the county convention, so ESTABLISH THE SERVICE TIER BEFORE USING minLotSize — an unsewered lot needs 2.8x the land. Note the per-dwelling-unit figures are the binding constraint on anything above one unit: a two-family dwelling needs 7,200 sq ft sewered (2 x 3,500 fits inside it) but 20,000 sq ft unsewered. Lot width at building line 100 ft; front yard 40 ft, which is 15 ft deeper than SC-R’s; maximum height two and one-half storeys not to exceed 36 ft. The side and rear yard figures are stated twice over — 10 ft for an ACCESSORY structure and 25 ft for a PRIMARY structure. sideSetback and rearSetback record the 25 ft primary-structure figure, which is the one that governs a house. § 605-C ADDS A SEPARATE MINIMUM ROAD FRONTAGE OF 100 FT (amended 2023-01-13), which here happens to equal the lot width at the building line — do not assume that holds elsewhere in this town, because in RA the two figures differ by 150 ft. No lot coverage limit is stated; the null is correct. Note the two ways this district is easy to confuse: it is not the SC-R hamlet district despite sharing a use list, and it is not the VILLAGE of Sidney, which is a separate jurisdiction with its own eCode360 Chapter 215 and eight districts of its own.Sewered lots need 3,500 sq ft per dwelling unit; unsewered lots need 10,000 sq ft per dwelling unit
- Residential-Agricultural District — Article VII, and the district most Sidney land outside the hamlets falls in. MINIMUM LOT AREA 5 ACRES, amended 2023-01-13; lot width at building line 100 ft; front yard 40 ft; maximum height 36 ft for residential buildings, with FARM STRUCTURES EXPRESSLY EXEMPT FROM ANY HEIGHT LIMIT. The side and rear yard figures are stated twice over — 10 ft for an ACCESSORY structure and 25 ft for a PRIMARY structure. sideSetback and rearSetback record the 25 ft primary-structure figure, which is the one that governs a house. This district states TWO different width figures and they diverge by 150 ft: lot width at the building line is 100 ft, but § 702(6) separately requires a MINIMUM ROAD FRONTAGE OF 250 FT (amended 2023-01-13). minLotWidthFt records the 100 ft lot width because that is the field’s basis and the code’s own term, but on any new lot the 250 ft road-frontage requirement is what actually governs how many lots a road-fronting parcel can yield, and it is 2.5x the recorded figure. On a long thin parcel that requirement, not the 5-acre minimum, is what caps the lot count. USES ARE THE MOST PERMISSIVE IN THE TOWN: § 700 incorporates everything permitted in the R and MD districts and adds agricultural, floricultural and horticultural pursuits including general farms, greenhouses, nurseries, truck gardens, dairies and the raising of bees, poultry and livestock with all customary buildings; forest management; seasonal dwellings; animal hospitals, riding stables, kennels and furbearing animal farms provided pens and runways sit at least 100 ft from any adjoining property line (pasture and exercise tracks excepted); and MULTI-FAMILY DWELLINGS AS A PERMITTED PRINCIPAL USE, which is unusual for a 5-acre rural district and the most permissive residential provision found in this county so far. Private garages may hold up to four commercial vehicles registered to the owner, and such a garage may not exceed 75% of the overall lot width in depth.Sewered lots need 3,500 sq ft per dwelling unit; unsewered lots need 10,000 sq ft per dwelling unit
- Maywood District — Article VI-B, and a genuinely unusual district: § 600-B states that ALL PERMITTED USES WITHIN THE MAYWOOD DISTRICT WILL REQUIRE A SPECIAL USE PERMIT, so nothing here is as-of-right even though the section is headed “Permitted Principal Uses”. MINIMUM LOT SIZE IS NOT A NUMBER: § 601-B(4) sets it as “required to accommodate the proposed property use as determined by the Planning Board during Site Plan Review”, so minLotSize is null by design and no lot width or road frontage is stated either — those nulls are the code’s position, not unread fields. What IS fixed: front yard 25 ft, side and rear 25 ft for primary structures and 10 ft for accessory structures, and a maximum height of 36 ft measured FROM THE LOWEST GROUND ELEVATION, which is a stricter basis than the two-and-a-half-storey formulation used in the residential districts and matters on a sloping site. The district is a small mixed-use node: it incorporates the SC-R use list, then adds by special permit retail business (small), personal service shops, galleries, artist and music studios, cafés, business or professional offices, custom-work shops for trades such as woodworking, plumbing and electrical using only light machines and hand tools, building and farm supply with incidental millwork, feed and solid fuel storage, farm implement sales, service, rental and auctions, utility service buildings and storage yards when fenced, residential or solar installations specific to the business, assisted living facilities, group homes, senior housing and housing for the disabled under NYS Department of Health codes, major home occupations, large wind projects, commercial solar arrays and farms, and commercial recreation establishments.Sewered lots need 3,500 sq ft per dwelling unit; unsewered lots need 10,000 sq ft per dwelling unit
- Commercial District — Article VIII. Like the Maywood District it sets NO numeric minimum lot size: § 801(8) makes lot area “minimum lot size as required to accommodate the proposed property use as determined by the Planning Board during Site Plan Review”, so minLotSize, minLotWidthFt and maxLotCoverage are all null by design rather than unread. Front yard 25 ft; side and rear 25 ft for primary structures and 10 ft for accessory structures; maximum height 36 ft measured FROM THE LOWEST GROUND ELEVATION. The practical consequence is that every commercial project in Sidney is a Planning Board site plan review in which the dimensional envelope is set case by case, so there is no schedule to underwrite against and an early conversation with the Board is the only way to size a scheme. Signs in this district confine all advertising to the premises of the business advertised, cap a wall identification sign at two square feet per horizontal foot of the wall it sits on and at 75% of that wall’s width (90% where the wall is 20 ft or less), and allow a maximum 12-inch projection with no part extending above or beyond the wall.Sewered lots need 3,500 sq ft per dwelling unit; unsewered lots need 10,000 sq ft per dwelling unit
- Common Plan of Development Overlay — Article V-B, ADDED 2023-12-14 and the newest zoning instrument found in Delaware County. AN OVERLAY, NOT A STANDALONE DISTRICT: height, front setback, and side and rear setbacks are all expressly “same as the underlying district”, which is why those fields are null here. Three things change, and they are strict. MINIMUM LOT SIZE 10 ACRES and MINIMUM FRONTAGE 250 FT — the largest minimum lot in the town by a factor of two against RA’s five acres. MAXIMUM LOT COVERAGE 30%, WHICH IS THE ONLY LOT-COVERAGE FIGURE ANYWHERE IN THE TOWN OF SIDNEY ZONING LAWS; every base district states none. AND READ THE TOWN’S OWN COVERAGE DEFINITION BEFORE APPLYING IT: § 300 defines lot coverage as the portion of the lot covered by the horizontal cross section of all principal AND accessory buildings, PAVED PARKING LOTS, AND OTHER IMPERVIOUS SURFACES — so this 30% is an impervious-surface cap, not a building-footprint cap, exactly as in the Town of Delhi, and on a 10-acre commercial or solar site the parking and access drives consume it fast. Maximum lot depth-to-width ratio 4:1. The front setback carries an additional contextual rule: same as the underlying district, OR, where adjacent lots are developed, no new building line may cross the front plane of the closest buildings on adjacent lots. PROCEDURE IS THE OTHER TEETH: § 506-B requires any application for subdivision, site plan approval or a special use permit within the CPD to notify IN WRITING BY CERTIFIED MAIL every property within 1,000 FEET of the outside border of the parcel, with proof of mailing at time of application — an unusually wide notice radius that adds real time and cost to a schedule.Sewered lots need 3,500 sq ft per dwelling unit; unsewered lots need 10,000 sq ft 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 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 rentalsShort-term rentals restricted. Short-term rentals have no as-of-right path in the Town of Sidney, and the reason is structural rather than an express ban — read this before assuming either permission or prohibition. THE TOWN PLAINLY THOUGHT ABOUT IT: Article III defines "AIR BNB" in terms, as "an online marketplace which lets people rent out their properties or spare rooms to guests", and separately defines BED-AND-BREAKFAST as a private residence with at least two and not more than five guest rooms rented to transient guests with food service in the morning only, which must be the operator’s prime residence and may employ no more than two people outside the family. THEN NEITHER TERM APPEARS ANYWHERE ELSE IN THE 116-PAGE LAW. Both are defined and then never used: neither is a permitted principal use, a permitted accessory use, or a special permit use in ANY of the five base districts. THAT SILENCE IS NOT NEUTRAL HERE, BECAUSE THIS CODE IS EXPLICITLY CLOSED-LIST AND UNUSUALLY STRICT ABOUT IT. § 503 Equivalent Uses says that where a use is not listed as permitted in any district, the Code Enforcement Officer refers it to the Planning Board for an interpretation, which may recommend to the Town Board that the Local Law be AMENDED — and then states that "in no case shall a building permit be issued for an equivalent use until the Local Law has been amended to permit such equivalent use in the appropriate zoning district." Most codes let a zoning board interpret an unlisted use onto an existing category; Sidney requires an act of the Town Board. So the lawful route to an STR here is a text amendment, not a permit — which is why this is recorded restricted rather than permitted or prohibited. RECORDED AS AN INFERENCE FROM THE CLOSED-LIST CLAUSE, NOT AS A QUOTED RULE. There is no sentence anywhere saying short-term rentals are forbidden, and in a rural town of this size the Code Enforcement Officer’s practice may be considerably more permissive than § 503 reads. WORTH RAISING WITH THE TOWN AS A DRAFTING DEFECT: defining two transient-lodging terms in a law adopted 2021 and amended twice in 2023, and then listing neither as a use in any district, looks like an omission rather than a decision — particularly for the bed-and-breakfast, whose definition is detailed enough (guest-room count, owner-occupancy, employee cap) to have been drafted for a district it never reached. Separate question from whether you can build the unit.
Sizing up a specific parcel in Sidney?
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 Sidney runs $191–250/sq ft, about $345k–450k at 1,800 sq ft , plus roughly $563 for a conforming lot. See what it costs to build a house in Sidney.
ADU cost in nearby towns
Andes
800 sq ft ≈ $185k–245k
Delhi
800 sq ft ≈ $185k–245k
Franklin
800 sq ft ≈ $185k–245k
Middletown
800 sq ft ≈ $185k–245k
Walton
800 sq ft ≈ $185k–245k
Delhi (Village)
800 sq ft ≈ $185k–245k
All Delaware County towns: Andes · Delhi · Franklin · Middletown · Walton · Delhi (Village) · Hancock (Village) · Sidney (Village) · Walton (Village)
More on Sidney: Can you build an ADU here? · Zoning for new construction · Delaware County build cost
ADU cost in Sidney: common questions
How much does it cost to build an ADU in Sidney, NY?
An 800 sq ft accessory dwelling unit in Town of Sidney runs roughly $185k–245k at a standard finish, general-contractor margin included. A 400 sq ft studio runs about $125k–160k. 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 Sidney?
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 $233–305/sq ft against $191–250/sq ft for a full house, even though it is the same trades doing the same work.
Are ADUs allowed in Sidney?
Town of Sidney has 6 districts. All districts prohibit ADUs. Check the specific address with the free ADU checker or confirm with the building department before you spend money on design.
Can I rent an ADU in Sidney short term?
Short-term rentals restricted for Town of Sidney. 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 Delaware 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 Sidney vary by district and often carry exceptions this page does not show; zoning last reviewed 2026-08-24; verify with the municipality before relying on any answer. Sources: Offsite / Aldo cost engine (costEngine.js + constants.js); zoning dataset (municipalData.js).