ADU · Monroe County

Can you build an ADU in Perinton, NY?

Town of Perinton has 5 districts. All districts prohibit ADUs. Check your address to confirm the district that applies to your parcel:

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What the Perinton code says

No accessory dwelling unit is allowed, and an accessory building may not be lived in. In B and C an existing one-family house can be converted to a two-family by special permit from the Zoning Board of Appeals, which creates two full dwellings.

Conditions the code attaches:

The conversion needs a Zoning Board of Appeals special permit, and Planning Board site plan approval for new units or exterior changes.
A special permit is valid for one year and must then be renewed, unless the board sets a different period (§ 208-54C).
A two-family lot needs 110 ft of width and 17,600 sf with sanitary sewers, or 125 ft and 21,875 sf without them; corner lots need 130 ft and 20,800 sf, or 150 ft and 26,250 sf.
The two-family building needs a ground area of at least 1,800 sf for one story, 1,300 sf for one and a half, or 1,100 sf for two or two and a half.
An accessory building may not be used for living purposes (§ 208-14G(3)), and APT permits only an apartment building of 4 to 12 units or an apartment group.
Confirm with Code Enforcement and Development at (585) 223-0770.

What the Perinton 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
Class AA Residential	0.46 ac	70 / 15 / 15 ft	40 ft	No
Class A Residential	0.41 ac	70 / 12 / 15 ft	40 ft	No
Class B Residential	0.33 ac	50 / 12 / 15 ft	40 ft	No
Class C Residential	0.33 ac	50 / 12 / 15 ft	40 ft	No
Apartment District	0.34 ac	70 / 40 / 40 ft	40 ft	No

Class AA Residential - A corner lot takes a larger lot: 30,000 sq ft on 150 ft of width, and it must hold the full front setback from each street or highway rather than a side yard. A single-family dwelling must also include a two-car private garage as a condition of the use.

Minimum ground area of the main structure is 1,400 sq ft for a one-storey building, 1,200 sq ft for a one-and-a-half-storey and 1,000 sq ft for a two- or two-and-a-half-storey.
Under § 208-34A(1), the Planning Board may permit townhouses in an AA, A, B or C residential subdivision of at least 40 developable acres.
Townhouses may occupy no more than 10% of the developable area, and the application must be made with the pre-preliminary subdivision application.
Townhouses must be in harmony with and complementary to the single-family houses proposed, and must meet the garage requirement of the district they sit in.
The lot minimum in AA is a single figure that does not change with sewer service.

Class A Residential - The figures shown apply to lots served by public sewer. A corner lot must be larger: 27,000 sq ft on 135 ft of width, and it has to meet the full front setback from each street or highway rather than a side yard.

A lot not served by sanitary sewers takes 20,000 sq ft on 100 ft of width, against 18,000 sq ft on 90 ft where sewers are available, and a corner lot 30,000 sq ft on 150 ft.
Townhouses may be permitted by the Planning Board under § 208-34A(1) only in an AA, A, B or C residential subdivision of at least 40 developable acres, on no more than 10% of the developable area.
A townhouse application must be made with the pre-preliminary subdivision application, be complementary to the single-family houses proposed, and meet the district's garage requirement.
A single-family dwelling must have a two-car private garage.
Minimum ground area of the main structure is 1,200 sq ft for a one-storey building, 1,000 sq ft for a one-and-a-half-storey and 850 sq ft for a two- or two-and-a-half-storey.

Class B Residential - The figures shown apply to a sewered single-family lot. This district publishes four sets of lot standards, crossing sewered against unsewered and single-family against two-family, and an unsewered lot owes a 15 ft side yard rather than 12 ft.

An unsewered lot takes 20,000 sq ft on 100 ft of width, nearly 40% more than the 14,400 sq ft a sewered lot needs, with a 15 ft side setback; a corner lot takes 22,750 sq ft on 130 ft.
A two-family needs 17,600 sq ft (0.404 acres) on 110 ft sewered or 21,875 sq ft (0.5022 acres) on 125 ft unsewered; corner lots are 20,800 sq ft on 130 ft and 26,250 sq ft on 150 ft.
A corner lot takes more land: 19,200 sq ft on 120 ft of width, and its setback from each street or highway is the full front setback rather than a side yard.
Minimum ground area runs 1,000 / 850 / 750 sq ft for a single-family dwelling, and for a two-family 1,800 sq ft one-storey, 1,300 one-and-a-half-storey and 1,100 two-storey.
A semidetached dwelling may have one zero-foot side yard; an agricultural structure takes 140 ft front, 30 ft side and 50 ft rear; a two-family hearing is noticed to owners within 500 ft.
Under § 208-34A(1) the Planning Board may permit townhouses in an AA, A, B or C subdivision of at least 40 developable acres, on no more than 10% of it, with the pre-preliminary application.

Class C Residential - The figures shown apply to a sewered single-family lot. This district publishes four lot rows, crossing sewered against unsewered and single-family against two-family, and an unsewered lot owes a 15 ft side yard rather than 12 ft.

An unsewered lot takes 20,000 sq ft on 100 ft of width, nearly 40% more than the 14,400 sq ft a sewered lot needs, with a 15 ft side setback; a corner lot takes 22,750 sq ft on 130 ft.
A two-family needs 17,600 sq ft (0.404 acres) on 110 ft sewered or 21,875 sq ft (0.5022 acres) on 125 ft unsewered; corner lots are 20,800 sq ft on 130 ft and 26,250 sq ft on 150 ft.
A corner lot takes a larger lot, 19,200 sq ft on 120 ft of width, and its setback from each street or highway is the full front setback rather than a side yard.
Minimum ground area runs 900 / 800 / 650 sq ft for a single-family dwelling, and for a two-family 1,800 sq ft one-storey, 1,300 one-and-a-half-storey and 1,100 two-storey.
A semidetached dwelling may have one zero-foot side yard, and a two-family hearing is noticed to every owner within 500 ft at least a week and no more than three weeks before it.
Under § 208-34A(1) the Planning Board may permit townhouses in an AA, A, B or C subdivision of at least 40 developable acres, on no more than 10% of it, complementary to the houses proposed.

Apartment District - Land area runs 15,000 sq ft for the first dwelling unit in each apartment building plus 3,000 sq ft for each additional unit. An apartment building must hold at least four units and no more than twelve, so a three-unit building is not permitted.

The 30% building coverage is measured against the developable project area, not the whole parcel.
The 40 ft side and rear figure is measured from all property lines.
Minimum unit sizes are 550 sq ft for an efficiency, 675 for a one-bedroom, 800 for a two-bedroom and 950 for a three-bedroom; efficiencies may be no more than 25% of the units.
Buildings in a group must stand 20 ft apart, or the height of the highest adjacent building if greater. No exterior wall may run more than 100 ft without a lateral offset of at least eight feet.
A building or group of more than 12 units needs direct access to a county or state highway by a private driveway or a road dedicated to the Town by the developer.
Open parking may not sit in a front or side yard.

ADUs vs. short-term rentals in Perinton

Short-term rentals allowed with local rules for Town of Perinton. Short-term rentals are allowed only in the Restricted Business, Commercial and Mixed Use districts, with a building permit, certificate of occupancy and operating permit. They are prohibited in residential, Apartment, Townhouse, Industrial and Planned Development districts. 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. Municipal source

Good to know

Residential lot minimum0.33–0.46 ac — an ADU still has to fit the district's lot and setback envelope.
UtilityRG&E territory.
Zoning codeecode360.com/6741096
Building dept(585) 223-0770

ADU FAQ — Perinton, NY

Are ADUs allowed in Perinton, NY?

Town of Perinton has 5 districts. All districts prohibit ADUs. Check your address with the free ADU checker, or confirm with the building department at (585) 223-0770.

Do I need a special permit for an ADU in Perinton?

No. No district in Town of Perinton permits an ADU, so there is no permit to apply for. Codes change, so verify with the building department at (585) 223-0770 before ruling it out.

Can I use an ADU as a short-term rental in Perinton?

Short-term rentals allowed with local rules for Town of Perinton. 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.

Run the free ADU check for your parcel →

What an ADU costs to build in Perinton

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 Perinton, priced by size.

How we know this

Sections analyzed: § 208-32A(3) and B; § 208-33A(4) and B; § 208-54C and D special permits; § 208-14A; § 208-14G(3); § 208-29; § 208-30A; § 208-31A; § 208-35A; § 208-8
Districts confirmed: 5 of 5 — every mapped district.
Last reviewed: 2026-08-07
Not covered here: Overlay districts, the zoning map, and any conditions attached to an individual parcel. Size limits and owner-occupancy terms sit in the code section above, not in this summary.

More on Perinton: Full zoning for new construction · ADU build cost · House build cost · ADU rules across Monroe County · All Monroe County towns

ADU information for Town of Perinton is compiled from the municipal code (last reviewed 2026-08-07) 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) 223-0770 before relying on any answer. Source: the Offsite / Aldo zoning dataset.