Bolthole Index

Erie County, New York

Zoning, building permits and septic rules in the Town of Amherst, New York

The Town of Amherst, New York requires a building permit for construction and alterations, and its Building Department issues them outside the Village of Williamsville12. Amherst adopts its own zoning under Chapter 203 of the town code3. Septic permits anywhere in Erie County come from the Erie County Department of Health4.

At a glance

Building permit
Required; issued by the Town of Amherst Building Department (outside the Village of Williamsville)12
Zoning
Yes, town zoning under Chapter 203 of the Amherst code3
Septic
Erie County Department of Health issues septic construction permits4
Minimum lot (R-1)
21,780 sq ft and 100 ft wide per dwelling5
Minimum lot (R-R)
3 acres and 200 ft wide per dwelling6
Accessory dwelling
Limited: special use permit, one per lot, owner occupied7
Owner-builder
Statewide workers' compensation form BP-1 rules apply; town-specific owner-builder rule not confirmed8

Who to call

Building permits

Town of Amherst Building Department

Building permits, plan review, inspections and certificates of occupancy for the Town of Amherst

(716) 631-7080

5583 Main St Williamsville, NY 14221

Zoning

Town of Amherst Planning Department

Technical review of subdivisions, site plans and rezoning requests for the Planning Board

(716) 631-7051

Septic permits

Erie County Department of Health — Division of Environmental Health

Onsite wastewater treatment system (septic) construction and repair permits countywide in Erie County

716-961-6800

sewage@erie.gov

ECDOH Building, 503 Kensington Avenue, Buffalo, NY 14214

Contact details are copied from each office’s official page and were checked against it on October 23, 2026.

Off-grid gear

Going off-grid in Town of Amherst means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in the Town of Amherst, NY?

Yes. The Town of Amherst requires a separate building permit or quick permit before construction starts, with a short list of exempt categories such as swings, playhouses under 144 square feet and playground equipment tied to a one- or two-family home1. The exemption never excuses work that breaks the uniform code or energy code1.

Starting without a permit costs double the regular fee or $50, whichever is greater, on top of other penalties1. New York State sets the floor: every town must require permits for work covered by the Uniform Code9.

The town's building code text applies to all areas of Amherst outside the Village of Williamsville2. If the address is in the village, ask the village office, not the town, which permit rules apply; we could not confirm the village's own arrangements.

Who issues building permits in Amherst, and how do you reach them?

The Town of Amherst Building Department reviews plans, issues building permits and sends inspectors to active work sites10. Reach it at (716) 631-7080 at 5583 Main St in Williamsville10. The Commissioner of Building administers the state uniform code, the energy code and the town's Chapter 832.

An application needs a completed building application form, a dimensioned site plan showing setbacks, drainage, sewage disposal and utilities, and construction documents stamped under New York Education Law11. Fees are paid to the town clerk, and an application that is not issued expires six months after processing is complete unless the commissioner extends it11. The fee schedule itself we could not confirm; ask the Building Department.

Inside Amherst, the town issues building permits; Erie County does not12.

Does Amherst have zoning, and what do lot sizes and setbacks look like?

Yes. The Town of Amherst zones land under Chapter 203 of its code, with residential districts including RR, S-A, R-1 through R-4 and MHR-8313. Rules differ by district, so find the parcel's district before you plan anything.

In the R-1 district, a single-family lot needs at least 21,780 square feet and 100 feet of width5. Required yards are 30 feet in front, 35 feet in back, 8 feet on each side and 20 feet combined sides14. Buildings may cover up to 35% of the lot and stand 2 stories or 35 feet1516. A one-story dwelling must have at least 1,200 square feet of floor area, and a taller one 1,40017.

In the Rural Residential (R-R) district, each dwelling needs at least 3 acres and 200 feet of width6. The front yard is 50 feet18, and residential building coverage tops out at 25%19. Dividing land is governed by Chapter 204 of the town code20.

How do septic permits work in Amherst?

Septic permits in Erie County, including Amherst, come from the Erie County Department of Health, not from the town's Building Department4. Building a new home that needs an onsite wastewater system means hiring a licensed design professional, who submits an engineer's report, plans, the permit application and a $300 fee21. The Department issues the construction permit once the plans meet its regulations4. Your design professional inspects during construction22.

Much of Amherst may be on public sewer, in which case none of this applies. We could not confirm which streets are sewered or the town's rules for connecting; ask the Amherst Engineering Department before you buy. County rules for connecting to an Erie County district sewer require a written permit from the district23. Septic and private-well properties also need a property-transfer certification from the Health Department before title passes24. For septic questions call 716-961-680025.

Can you live in an RV or tiny home in Amherst?

We could not confirm any Amherst rule on living in an RV, a tiny home or camping on private land, so call the Building Department at (716) 631-7080 before you buy10. Do not assume a lot allows it.

Accessory dwelling units are allowed in limited form: a special use permit is required, valid for up to two years and renewable, with one unit per lot and the owner living on the property7. The unit must be at least 500 square feet and no more than two bedrooms7.

A manufactured home needs a building permit and a certificate of occupancy anywhere in the county, and local zoning may also apply26. Amherst lists an MHR-8 residential district in its zoning code, but we could not confirm its use rules13.

Building a home in Amherst: the steps, in order

  1. Find the parcel's zoning district in Chapter 203 and check lot size, yards and height against your plan3.
  2. Ask the Planning Department at (716) 631-7051 whether a subdivision, site plan or rezoning review applies27.
  3. If the site needs a septic system, hire a licensed design professional and apply to the Erie County Department of Health21.
  4. Apply to the Building Department with a site plan and stamped construction documents11.
  5. Pay fees at the town clerk and begin work within six months, or the permit can expire11.
  6. Call for inspections of the site, footing and foundation, framing and building systems before covering any work28.
  7. Finish with a final inspection and a certificate of occupancy before anyone moves in10.

What stays with Erie County, and what to check before you buy in Amherst

Erie County, not the town, handles septic permits and property-transfer certifications4. For land outside Amherst, see the Erie County page.

Before buying, ask the Building Department at (716) 631-7080 whether the parcel sits in a mapped flood area10. We could not confirm town rules on driveway curb cuts, wells, permit fees or short-term rentals; ask the Building Department. Driveways onto a state highway need a state permit29.

Costs: Erie County's effective property tax rate is about 2.1%, with a median bill near $4,525 a year3031. A homeowner acting as their own general contractor on an owner-occupied one- to four-family home files form BP-1 only if paid helpers work fewer than 40 hours a week combined8.

Watch-outs

  • Inside the Village of Williamsville, the town's building code text does not apply, so confirm with the village which office issues building permits2.
  • Starting work without a permit costs double the regular fee or $50, whichever is greater1.
  • The rules above come from the R-1 and R-R districts; other Amherst districts have different lot sizes and yards, so confirm the parcel's district before relying on them13.
  • We could not confirm Amherst rules on RVs, tiny homes, wells, driveways, fees or short-term rentals; call the Building Department at (716) 631-708010.

Sources

  1. Chapter 83 Building Construction Administration, Part V: Permits - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  2. Chapter 83 Building Construction Administration, Part I: General Provisions - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  3. Chapter 203 Zoning, Part 3: Residential Districts - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  4. Septic and Onsite Wastewater Systems, quoted and re-checked
  5. Chapter 203 Zoning, Part 3: Residential Districts - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  6. Chapter 203 Zoning, Part 3: Residential Districts - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  7. Chapter 203 Zoning, Part 6: Use Regulations - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  8. Workers’ Compensation Requirements for Government Issued Permits, Licenses and Contracts, quoted and re-checked
  9. Legal Memorandum LG03: NYS Uniform Fire Prevention and Building Code, quoted and re-checked
  10. Town of Amherst Building Department (amherst.ny.us)
  11. Chapter 83 Building Construction Administration, Part V: Permits - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  12. NYS Department of State - Building Standards and Codes (2026 county census)
  13. Chapter 203 Zoning, Part 3: Residential Districts - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  14. Chapter 203 Zoning, Part 3: Residential Districts - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  15. Chapter 203 Zoning, Part 3: Residential Districts - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  16. Chapter 203 Zoning, Part 3: Residential Districts - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  17. Chapter 203 Zoning, Part 3: Residential Districts - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  18. Chapter 203 Zoning, Part 3: Residential Districts - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  19. Chapter 203 Zoning, Part 3: Residential Districts - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  20. Town of Amherst, NY eCode360 table of contents (Town of Amherst), quoted and re-checked
  21. Septic and Onsite Wastewater Systems, quoted and re-checked
  22. Septic and Onsite Wastewater Systems, quoted and re-checked
  23. Sanitary Sewer Connection Permits, quoted and re-checked
  24. Septic and Onsite Wastewater Systems, quoted and re-checked
  25. Erie County Department of Health — Division of Environmental Health (www3.erie.gov)
  26. Division of Building Standards and Codes Frequently Asked Questions, quoted and re-checked
  27. Town of Amherst Planning Department (amherst.ny.us)
  28. Chapter 83 Building Construction Administration, Part V: Permits - Town of Amherst, NY (Town of Amherst), quoted and re-checked
  29. Residential Driveway Permits (New York statewide rule), quoted and re-checked
  30. Effective property tax rate: Bolthole Index county data
  31. Median property tax bill: Bolthole Index county data

Written October 23, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Town of Amherst

Town of Amherst’s own rules

  • Building permitRequired

    Construction, alteration, and related work inside Amherst town, permitted by the Town of Amherst Building Department

    • Work may commence only after a separate building permit or quick permit is obtained, except the exempt categories listed in § 83-5-1.
    • Exempt categories include swings, playhouses under 144 square feet and playground equipment, and above-ground pools under 24 inches deep, all associated with a one- or two-family dwelling; the exemption does not authorize work that violates the uniform or energy code.
    • Work that commences without a permit carries a permit fee of double the regular rate or $50, whichever is greater, in addition to other penalties.
    “without first obtaining a separate building permit or quick permit from the commissioner of building for each such building, structure or parking lot, except that no permit shall be required for work in any of the following exempt categories”
  • Building code adoptedAdopted (with conditions)

    Construction inside Amherst town outside the Village of Williamsville, administered by the Town's Commissioner of Building

    • The town's commissioner administers and enforces the New York State uniform code and energy code together with Chapter 83.
    • The uniform code is defined in § 83-1-7 as the New York State uniform fire prevention and building code, as currently in effect and as hereafter amended.
    “the commissioner of building shall administer and enforce the uniform code, the energy code and this chapter, which shall apply to all areas of the town of amherst outside of the village of williamsville”
  • InspectionsRequired

    Work authorized by a building permit inside Amherst town

    • Permit holder must notify the commissioner when each element is ready for inspection.
    • No work may be covered or concealed until examined and approved by the assigned inspector.
    • Listed elements include footing and foundation, framing, building systems including underground and rough-in, and a final inspection after all permitted work is complete.
    “the following elements of the construction process shall be inspected, where applicable: (a) work site prior to the issuance of a building permit; (b) footing and foundation; (c) preparation for concrete slab; (d) framing; (e) building systems, including underground and rough-in;”
  • Local zoningPresent (with conditions)

    Land inside Amherst town's limits, under the town's Chapter 203 Zoning ordinance (Town of Amherst, NY)

    • The ordinance is in the Town's adopted code at eCode360 (Chapter 203, Zoning, §§ 1-1 to 9-6).
    • The Chapter 83 building code text states it applies to areas of the town outside the Village of Williamsville; this research did not confirm the zoning chapter's own geographic limits.
    “3-4-1. purpose. to provide areas within the town for low-density single-family detached residential development where each dwelling unit shall be located on an individual lot of at least 21,780 square feet.”
  • Zoning districtsPublished (with conditions)

    Land inside Amherst town's limits under Chapter 203 Zoning

    • The Part 3 table of contents lists residential districts RR, S-A, R-1 through R-4, CR-3A, TR-3, MFR-4A through MFR-7 and MHR-8; Part 4 and Part 5 district lists were not opened.
    “§ 3-2 rural residential district (r-r) § 3-3 suburban agricultural district (s-a) § 3-4 residential district one (r-1)”
  • Minimum dwelling sizeSpecified

    Single-family detached dwelling in the R-1 Residential District One, inside Amherst town

    • Per the R-1 principal use table, the minimum floor area applies to the dwelling only; the table note refers to § 2-5 for measurement and exceptions, not opened.
    • Other districts (RR, SA, R-2, etc.) were not fully checked here; see followups.

    min. floor area (dwelling only), 1 story: >= 1200 sf · min. floor area (dwelling only), more than 1 story: >= 1400 sf

    “min. floor area (dwelling only) 1 story 1,200 sf more than 1 story 1,400 sf”
  • Minimum lot sizeSpecified

    Single-family dwelling in the R-R Rural Residential district (agricultural/rural-residential district), inside Amherst town

    • Table note: for explanation of measurements, computations, and exceptions see § 2-5 (not opened).
    • The S-A Suburban Agricultural district is listed in the same Part 3 but is not separately claimed here.

    min. lot area (per dwelling): >= 3 acres · min. lot width: >= 200 ft

    “r-r principal use dimensional standards min. lot area (per dwelling) 3 acres min. lot width 200 ft”
    One more reviewed finding on this topic
  • SetbacksSpecified

    Principal structures in the R-1 Residential District One, inside Amherst town

    • Corner and through lots follow § 2-5-2a(5) and (2), not opened.

    front yard: >= 30 ft · rear yard: >= 35 ft · combined side yard: >= 20 ft · each side yard: >= 8 ft

    “min. yards front yard 30 ft rear yard 35 ft combined side yard 20 ft each side yard 8 ft”
    One more reviewed finding on this topic
  • Lot coverageSpecified

    Principal structures in the R-1 Residential District One, inside Amherst town

    • Accessory structures in R-1 have a separate 40% limit on building coverage including the principal structure, per the R-1 accessory use table.

    max. building coverage: <= 35 %

    “r-1 principal use dimensional standards min. lot area (per dwelling) 21,780 sf min. lot width 100 ft min. yards front yard 30 ft rear yard 35 ft combined side yard 20 ft each side yard 8 ft corner lot see § 2-5-2a(5) through lot see § 2-5-2a(2) max. height 2 stories (up to 35 ft) max. building coverage 35% min. floor area (dwelling only) 1 story 1,200 sf more than 1 story 1,400 sf”
    One more reviewed finding on this topic
  • Building heightSpecified

    Principal structures in the R-R Rural Residential district, inside Amherst town

    • Nonresidential structures in R-R: maximum 65 ft.

    max. height, residential: <= 35 ft (2 stories maximum) · max. height, nonresidential: <= 65 ft

    “max. height residential 2 stories (up to 35 ft) nonresidential 65 ft”
    One more reviewed finding on this topic
    • Specified — Principal structures in the R-1 Residential District One, inside Amherst town
      “r-1 principal use dimensional standards min. lot area (per dwelling) 21,780 sf min. lot width 100 ft min. yards front yard 30 ft rear yard 35 ft combined side yard 20 ft each side yard 8 ft corner lot see § 2-5-2a(5) through lot see § 2-5-2a(2) max. height 2 stories (up to 35 ft) max. building coverage 35% min. floor area (dwelling only) 1 story 1,200 sf more than 1 story 1,400 sf”
  • Accessory dwellingsLimited

    Accessory dwelling units on single-family lots inside Amherst town, including R-1 (where ADUs are a listed accessory use)

    • Requires a special use permit under § 8-6, valid for up to two years and renewable.
    • Maximum one ADU per lot; the principal or ADU must be owner occupied and the owner must certify principal residence.
    • Minimum 500 sq. ft.; not more than 49% of principal dwelling gross floor area up to 900 sq. ft., whichever is less restrictive; maximum two bedrooms (a third in the roof).
    • Detached ADUs in RR, R-1, SA and AG districts: minimum 10 ft separation, maximum two stories (up to 25 ft), not between the principal structure and the street, and must meet side-yard requirements; one to two off-street parking spaces.

    ADU minimum floor area: >= 500 sf (whichever is less restrictive relative to 49% of principal dwelling gross floor area up to 900 sf)

    “where permitted as an accessory use in part 3, an accessory dwelling unit may be constructed within any single-family detached dwelling following approval of a special use permit as set forth in § 8-6”
  • Subdividing landRegulated (with conditions)

    Division of land inside Amherst town

    • Subdivision is governed by Chapter 204, Subdivision of Land (§§ 1-1 to 5-5) of the Town code; its numeric standards were not opened.
    “chapter 204 subdivision of land (§ 1-1 &ndash; § 5-5)”
  • Permit processPublished (with conditions)

    Building permit applications inside Amherst town

    • Application must include a completed building application form, a dimensioned site plan (including setbacks, drainage, sewage disposal and utilities), and construction documents stamped per NY Education Law.
    • Fees are paid to the town clerk; unissued applications expire after six months from processing completion unless extended by the commissioner.
    • Permit expires if construction does not start within six months (two months for demolition) and if work is not completed within two years, subject to the commissioner's discretion.

    permit application expiry: 6 months (from completed processing date, unless extended by the commissioner)

    “an application for a building permit shall be made to the building department and shall contain the following information and documents:”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Town of Amherst or Erie County directly.

  • Owner-builder exemption — Owner-performed construction on owner-occupied homes inside Amherst town
  • Living in an RV — Long-term RV occupancy on private land inside Amherst town
  • Camping on your land — Temporary camping on private land inside Amherst town
  • Tiny homes — Tiny home occupancy inside Amherst town
  • Manufactured homes — Manufactured home occupancy inside Amherst town
11 more unanswered
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain
  • Short-term rentals
  • Permit fees

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Town of Amherst publishes no rule on the point, not that none exists. Erie County’s page lists the county offices to call.

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