Town of Johnston
Town of Johnston Zoning Ordinance
§ 340-98

Property size and coverage

[Amended 11-14-2011 by Ord. No. 2011-26]

  • A. The tract of land for a planned development shall consist of not less than the following minimum lot criteria and NET area requirements after freshwater wetlands, wetland buffers, slopes in excess of 8%, easements, and previously developed (not proposed for redevelopment) areas have been deducted from the following land area calculations:
    • (1) Net area equal to at least 20 acres unless the Planning Board and Town Council approve a waiver of this requirement where the Planning Board finds that the proposed area provides adequate and suitable area for the use(s) proposed to be added, and is consistent with the goals and purposes of Planned Districts as set forth in § 340-92, and provides for a campus-like setting with an efficient, integrated pattern of development providing for easy pedestrian access to and between facilities and other pedestrian-friendly amenities; has adequate and suitable infrastructure and parking and properly manages traffic safety and circulation issues; has suitable designed physical improvements, including plantings and landscaped buffering for the protection of abutters; and is consistent with the Town's Comprehensive Community Plan.
    • (2) Length of continuous frontage on an improved public street: 100 feet.
    • (3) Total maximum building coverage shall be determined on a sliding scale, as follows:
      • (a) If less than 25% of the total gross tract is excluded due to the existence of steep slopes and/or wetlands, then the maximum lot coverage shall not exceed 40% of the net tract.
      • (b) If 25% to 40% of the total gross tract is excluded due to the existence of steep slopes and/or wetlands, then the maximum lot coverage shall not exceed 50% of the net tract.
      • (c) If more than 40% of the total gross tract is excluded due to the existence of steep slopes and/or wetlands, then the maximum lot coverage shall not exceed 60% of the net tract.
  • B. The tract of land for a Planned Mixed Use Development District shall consist of not less than the following minimum lot criteria and net area requirements after freshwater wetland buffers, slopes in excess of 8% easements, and previously developed (not proposed for redevelopment) areas have been deducted from the following land area calculations:
    • (1) Net area equal to at least 10 acres; and
    • (2) Length of continuous frontage on an improved public street: 100 feet.