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

Town of Mamaroneck’s own rules

• Local zoningPresent (with conditions)

  Land inside Mamaroneck town (Town of Mamaroneck, NY) that falls under the Town's own zoning ordinance, Chapter 240 of the Town Code. The Villages of Mamaroneck and Larchmont are separate municipalities with their own codes and are not covered by this claim.

  • Chapter 240 residence district sections are numbered §§ 240-33 through 240-39 (R-50, R-30, R-20, R-15, R-10, R-7.5, R-6); the ecode360 page opened does not state the geographic reach of the ordinance, so whether it covers only unincorporated Town land is not verified.

  “town of mamaroneck, ny chevron_right chevron_right pt ii general legislation chevron_right ch 240 zoning chevron_right art vi residence districts: bulk and dimensional requirements”

• Zoning districtsPublished (with conditions)

  Zoning districts of Mamaroneck town's Chapter 240 residence district regulations

  • The district list on the ecode360 page includes one-family districts R-50, R-30, R-20, R-15, R-10, R-7.5 and R-6, plus two-family R-2F (§ 240-40), garden apartment R-GA (§ 240-41), attached residence R-A (§ 240-42) and tower apartment R-TA (§ 240-43) districts.

  “§ 240-33 one-family residence district: r-50. § 240-34 one-family residence district: r-30. § 240-35 one-family residence district: r-20. § 240-36 one-family residence district: r-15.”

• Minimum dwelling sizeSpecified

  R-50 one-family residence district in Mamaroneck town: minimum FIRST-FLOOR area only, not total dwelling size

  • Minimum first-floor area varies by stories: one story 2,100 sq ft; one and one-half stories 1,800 sq ft; two and one-half stories 1,500 sq ft.
  • No minimum total floor area was located in the R-50 section read.

  minimum first floor area, one story: >= 2100 square feet · minimum first floor area, one and one-half stories: >= 1800 square feet · minimum first floor area, two and one-half stories: >= 1500 square feet

  “c. floor area. minimum first floor area, in square feet. (1) one story: 2,100. (2) one and one-half stories: 1,800. (3) two and one-half stories: 1,500.”

• Minimum lot sizeSpecified

  R-30 one-family residence district in Mamaroneck town (Chapter 240, § 240-34)

  • Minimum lot width and length of street line frontage: 125 feet.
  • Minimum depth of lot: 150 feet.

  minimum lot area per dwelling unit: >= 30000 square feet

  “(1) minimum lot area per dwelling unit: 30,000 square feet. (2) minimum lot width and length of street line frontage: 125 feet. (3) minimum depth of lot: 150 feet.”

  2 more reviewed findings on this topic

  • Specified — R-50 one-family residence district in Mamaroneck town (Chapter 240, § 240-33), the lowest-density single-family district

    “(1) minimum lot area per dwelling unit: 50,000 square feet. (2) minimum lot width and length of street line frontage: 150 feet. (3) minimum depth of lot: 150 feet.”

  • Specified — R-20 one-family residence district in Mamaroneck town (Chapter 240, § 240-35)

    “§ 240-35 one-family residence district: r-20. a. lot requirements. (1) minimum lot area per dwelling unit: 20,000 square feet.”

• SetbacksSpecified

  R-50 one-family residence district in Mamaroneck town (Chapter 240, § 240-33)

  • On a corner lot, a front yard should be provided on each street. (see § 240-54.)
  • A rear yard shall be provided on a corner lot, and the owner shall have the privilege of electing which yard is to be the rear yard.
  • An unattached accessory building not over one story or 15 feet in height and located on the rear 1/3 of the lot may be placed at a minimum distance of five feet from the property line; on a corner lot it may not be nearer the street line than the required minimum front yard setback.
  • Minimum courts: as required by § 240-55.

  minimum front yard: >= 50 feet · minimum side yard (each side): >= 35 feet · minimum rear yard: >= 50 feet (Unattached accessory building on rear 1/3 of lot may be 5 feet from property line)

  “(1) minimum front yard: 50 feet. on a corner lot, a front yard should be provided on each street. (see § 240-54.) (2) minimum side yards: 35 feet for each side yard. (3) minimum rear yard: 50 feet.”

• Lot coverageSpecified

  R-50 one-family residence district in Mamaroneck town (Chapter 240, § 240-33)

  • The cap covers buildings, accessory structures, pools, courts, drives and paved areas together.
  • The maximum-size section § 240-59.1 is cross-referenced and was not read.

  maximum lot coverage (buildings, accessory structures, pools, courts, drives and paved areas): <= 35 percent

  “f. lot coverage. no buildings, accessory structures, pools, courts, drives or paved areas shall be erected or installed to exceed a lot coverage of 35%.”

• Building heightSpecified

  R-50 one-family residence district in Mamaroneck town (Chapter 240, § 240-33)

  • Height is stated both in stories and in feet in the same subsection (d. maximum heights).

  maximum height in stories: <= 2.5 stories · maximum height in feet: <= 35 feet

  “d. maximum heights. (1) in stories: 2 1/2. (2) in feet: 35.”

Still unanswered

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

• Building permit — Building permits for new construction inside Mamaroneck town
• Owner-builder exemption — Owner-builder permit exemption for work inside Mamaroneck town
• Building code adopted — Building code adopted for Mamaroneck town
• Inspections — Building inspections for work inside Mamaroneck town
• Certificate of occupancy — Certificate of occupancy for new dwellings inside Mamaroneck town

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.

Off-grid gear

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

• Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
• Power Bluetti Solar generators and home battery backup for living off the grid.
• Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
• Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.

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