ADU · Monroe County
Can you build an ADU in Sweden, NY?
Town of Sweden has 4 districts. All districts prohibit ADUs. Check your address to confirm the district that applies to your parcel:
What the Sweden 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 |
|---|---|---|---|---|
| One-Family Residential, no sewer and/or water (R1-2) — 80,000 sf (1.84 acres) with 200 ft of width measured AT THE FRONT LINE OF THE HOUSE (not at the street), 200 ft of depth and only 60 ft of road frontage, which makes this a flag-lot-friendly district: a lot may neck down to 60 ft at the road provided it opens to 200 ft where the house sits. Front setback 75 ft, rear 40 ft, side 10 ft, maximum height 36 ft. § 175-15 names this district 'One-Family Residential District, no sewer and/or water' — the unserviced district is the DEFAULT residential zone of the town and the S districts are separately mapped, so this is not a sewer-conditional reading of one district the way Perinton's classes are. THE 80,000 SF HEADLINE IS THE MIDDLE OF A FOUR-STEP LADDER KEYED TO THE SEPTIC SYSTEM AND WATER SUPPLY, AND THE SPREAD IS 5.4x. § 175-36D(2) sets: 40,000 sf with 150 ft of width where the lot has PUBLIC WATER and an in-ground or modified raised fill system; 80,000 sf base; 150,000 sf with 260 ft of width where an ABOVEGROUND modified raised fill system is used (mineral deposits or shallow bedrock); and FIVE ACRES with 260 ft of width where a FULL raised fill system is required. Road frontage stays 60 ft at every step. THE 40,000 SF STEP IS THE COMMON CASE, NOT AN EXCEPTION — a 1,919-parcel residential sample of Sweden from the Monroe County parcel layer returned 1,312 on public water against 605 private, so roughly 68% of residential parcels already have the water half of that test and the binding question is the soil, not the pipe. Underwriting an R1-2 parcel therefore starts with a percolation and depth-to-bedrock answer, not with the district minimum. LOT AREA IS NET, NOT GROSS, AND THIS IS THE SECOND YIELD TRAP: § 175-36D(2)(d) requires lot areas to be EXCLUSIVE OF designated wetlands AND THEIR ONE-HUNDRED-FOOT BUFFERS, highway rights-of-way, reserved strips, and the land containing the driveway on a flag lot. A hundred-foot buffer around a small wetland removes far more area than the wetland itself, and on a flag lot the entire access neck is deducted, so gross deed acreage divided by 80,000 sf overstates yield on any constrained parcel. Minimum building size is 1,000 sf for a ranch, 710 sf for a one-and-one-half-storey, split-level or raised ranch, and 576 sf for a two-storey. Note that the septic system carries its own setbacks distinct from the building's: an aboveground modified raised fill system on a 150,000 sf lot needs 75 ft to the sides and 50 ft front and rear, and on a 40,000 sf lot 25 ft to every property line, with front leach field setbacks measured from the point at which the lot attains its required width at the front line of the house. | 1.8365 ac | 75 / 10 / 40 ft | 36 ft | No |
| One-Family Residential within a sanitary sewer district (R1-2S) — 15,000 sf (0.34 acres) with 100 ft of width at the front line of the house, 150 ft of depth and 60 ft of road frontage. Front setback 50 ft, RISING TO 75 FT ON AN ARTERIAL HIGHWAY; rear 40 ft; side 10 ft; maximum height 36 ft. THE 'S' IS A MAPPED SEWER DISTRICT, NOT A CONDITIONAL ALTERNATIVE — § 175-15 defines this district as 'One-Family Residential District within a sanitary sewer district', so a parcel is either in it or in R1-2 by location on the Zoning Map, and the answer for a given parcel comes from the map rather than from asking whether that lot happens to be connected. The practical consequence is the largest single dimensional fact in the town: THE SAME ONE-FAMILY HOUSE NEEDS 15,000 SF HERE AND 80,000 SF IN R1-2, a 5.3x difference in land per lot driven purely by which district the parcel sits in. Sewer availability is genuinely split across the town — a 1,919-parcel residential sample from the Monroe County parcel layer returned 1,113 on private septic against 802 on public sewer, so the unserviced R1-2 case is the majority and this district is the minority, concentrated around the Village of Brockport. None of the R1 districts state a maximum lot coverage, so the null here is the code rather than a gap; the envelope is controlled by the setbacks and the 36 ft height alone. Minimum building size is the same town-wide floor as R1-2: 1,000 sf ranch, 710 sf one-and-one-half-storey or split-level or raised ranch, 576 sf two-storey. Unlike R1-2 this district states no septic-system ladder and no net-area deduction clause, because neither applies to a sewered lot. | 0.3444 ac | 50 / 10 / 40 ft | 36 ft | No |
| One-Family Residential within a sanitary sewer district (R1-3S) — 10,200 sf (0.23 acres) with 85 ft of width at the front line of the house, 120 ft of depth and 50 ft of road frontage. This is the SMALLEST minimum lot in the Town of Sweden and the town's densest one-family district. Front setback 40 ft, RISING TO 75 FT ON AN ARTERIAL HIGHWAY, and note the additional rule that ALL PROPERTY LINES ABUTTING A STREET MUST MEET THE FRONT SETBACK — so a corner lot owes 40 ft on both frontages rather than a front and a side, which on an 85 ft wide lot is the constraint that actually shapes the buildable envelope. Rear 40 ft; side 10 ft; maximum height 36 ft. THE DEPTH FIGURE IS THE ONLY FLEXIBLE DIMENSION IN THE TOWN: § 175-38D(1)(c) permits the 120 ft depth to be reduced BY UP TO 10% (to 108 ft) provided the minimum square-foot lot area is still maintained, which is a trade of depth for width rather than a reduction in area. Like R1-2S this is a mapped sewer district under § 175-15, not a conditional reading, and like every R1 district it states no maximum lot coverage, so that null is deliberate. Minimum building size is the town-wide floor: 1,000 sf ranch, 710 sf one-and-one-half-storey, split-level or raised ranch, 576 sf two-storey — worth noting against the small lot, since a 1,000 sf ranch footprint on a 10,200 sf lot is already about 10% coverage before a garage or driveway. | 0.2342 ac | 40 / 10 / 40 ft | 36 ft | No |
| Multiple Residence (MR-1) — the town's only multi-unit district, and the only route to a second dwelling unit anywhere in Sweden. Permits multiple dwellings, town homes, patio homes, condominiums and ZERO LOT-LINE DUPLEXES AND QUADPLEXES as principal uses BY RIGHT, with no special permit named in § 175-39A. MR-1 STATES NO MINIMUM LOT AREA AT ALL AND minLotSize IS THEREFORE NULL BY DESIGN, NOT MISSING: § 175-39B(2) is headed 'Required lot area' but gives only a 200 ft frontage and a 200 ft depth, so the district is governed by shape plus density rather than by an area floor. YIELD COMES FROM THE DENSITY CAP AND THE COVERAGE CAP TOGETHER: no more than 12 DWELLING UNITS PER ACRE, and lot coverage no more than 50%. Setbacks are front 20 ft, side 20 ft, rear 50 ft — the front and side are the most permissive in the town by a wide margin (against 40-75 ft fronts in the R1 districts) while the rear is the most restrictive, and a minimum distance of 20 ft is required between buildings on the same site. Maximum height 36 ft, the same as every residential district here. A THIRD CONSTRAINT BINDS ALONGSIDE THE 50% COVERAGE AND IS EASY TO MISS: § 175-39B(5) requires AT LEAST 25% OF THE TOTAL LOT AREA TO REMAIN OPEN AND UNUSED, and while that open area may count landscaping, stormwater retention or detention, underground utilities, screening and fencing, it MAY NOT be paved or used for parking, storage, buildings or accessory buildings. Because parking is excluded from the open area but is not counted in the 50% building coverage either, the real site plan is a three-way split between building, parking and protected open space, and the 25% floor will often bind before the 50% cap on a surface-parked scheme. Appropriate landscaping is required throughout the district. | — | 20 / 20 / 50 ft | 36 ft | No |
ADUs vs. short-term rentals in Sweden
No local short-term-rental law on record - which is not the same as permission for Town of Sweden. NO short-term rental provision exists anywhere in the Town of Sweden Code. Ch. 175 Zoning was searched in full across all twelve articles and contains no short-term rental, tourist home, bed-and-breakfast or transient-occupancy standard; the only 'rental' hits in the chapter are inside the ADULT BOOKSTORE and ADULT VIDEO STORE definitions in § 175-7, which concern the sale or rental of printed and video material and have nothing to do with lodging. THE ZONING CHAPTER ALONE IS NOT A SUFFICIENT CHECK IN THIS COUNTY and it was not relied on: the Town of Gates regulates STRs from a SEPARATE Ch. 148 Rental Properties law, so all 64 chapters of the Sweden Code were enumerated from the eCode360 table of contents and swept for a rental, lodging, licensing or registration chapter. There is none. The closest chapters are Ch. 141 Property Maintenance and Ch. 169 Vacant Building Registry, neither of which reaches short-term rental. The Building Department's own published permit list corroborates this — it offers building, plumbing, pool/spa, sign, home occupation and vacant-building-registration forms and no short-term rental permit. ABSENCE IS NOT PERMISSION: Ch. 175 states permitted principal uses as a closed list per district, so a short-term rental in a Sweden dwelling may be unpermitted as an unlisted use even though no section names it. 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 the Building Department at (585) 637-8684. 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
- UtilityRG&E territory.
- Building dept(585) 637-8684
- Last reviewed2026-08-13
ADU FAQ — Sweden, NY
Are ADUs allowed in Sweden, NY?
Town of Sweden has 4 districts. All districts prohibit ADUs. Check your address with the free ADU checker, or confirm with the building department at (585) 637-8684.
Do I need a special permit for an ADU in Sweden?
No. No district in Town of Sweden permits an ADU, so there is no permit to apply for. Codes change, so verify with the building department at (585) 637-8684 before ruling it out.
Can I use an ADU as a short-term rental in Sweden?
No local short-term-rental law on record - which is not the same as permission for Town of Sweden. 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 Sweden
Permission is one question and budget is another. An 800 sq ft accessory unit here runs roughly $200k–260k 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 Sweden, priced by size.
More on Sweden: Full zoning for new construction · ADU build cost · House build cost · All Monroe County towns
ADU information for Town of Sweden is compiled from the municipal code (last reviewed 2026-08-13) 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 building department at (585) 637-8684 before relying on any answer. Source: Offsite / Aldo zoning dataset, municipalData.js.