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Grundy County Unincorporated
City Zoning Code

CHAPTER 3

DISTRICT INTENSITY AND BULK STANDARDS

8-3-1: PURPOSE:

The purpose of this chapter is to establish the general standards for the character of development that is allowed within each zoning district.
   A.   Standards Applicable To Parcels Proposed For Development: This chapter establishes general regulations for the character of specific parcels proposed for development. This is accomplished through the establishment of:
      1.   Limitations on density and intensity,
      2.   Minimum open space requirements for residential and mixed use development,
      3.   Maximum impervious surface areas for nonresidential development, and
      4.   Minimum lot area requirements for all land uses.
   B.   Standards Applicable To Individual Lots: The character of development of individual lots is regulated by minimum requirements for building height, lot dimensions, setbacks, floor area ratios, and open space or impervious surface limitations. (Ord. 10-001, 1-12-2010)

8-3-2-1: RESIDENTIAL DENSITY STANDARDS:

Residential site development standards are shown in table 8-3-2-1, "Residential Density Standards", of this section.
TABLE 8-3-2-1
RESIDENTIAL DENSITY STANDARDS
District And Development Type (Average Lot Size)
Minimum Open Space Ratio (OSR)1
Minimum Lot Size
Minimum Area Of Site Proposed For Development
District And Development Type (Average Lot Size)
Minimum Open Space Ratio (OSR)1
Minimum Lot Size
Minimum Area Of Site Proposed For Development
Agricultural (A):
 
 
 
    Farmstead
n/a
1.5 acres
20 ac.
    Manufactured home park
0.20
7,200 sq. ft. – 12,240 sq. ft.
10 acres with 20 acres maximum
    Single-family (Ag. split option)2
n/a
5 acres
20 acres
Agricultural residential (AR):
 
 
 
    Farmstead
n/a
1.5 acres
n/a
    Single-family
n/a
1.5 acres
n/a
Planned residential (PR):
 
 
 
    Cluster
0.25
18,000 sq. ft.
15 acres
    Single-family
0.10
2 acres
15 acres
Residential (R):
 
 
 
    All permitted residential types
See section 8-3-2-2, "Table 8-3-2-2, Single-Family Lot And Building Standards", of this chapter for the residential (R) district
Commercial general (CG):
 
 
 
    Multi-family
0.30
8,000 sq. ft.
4 acres
 
Notes:
   1.    OSR - "open space ratio". OSR for single-family and manufactured housing development does not apply to the development of 1 home on an individual lot of record.
   2.    Up to 5 lots permitted, provided there is a 20 acre combined required area per single- family residence. See section 8-2-4-10 of this title.
(Ord. 10-001, 1-12-2010)

8-3-2-2: SINGLE-FAMILY DETACHED:

   A.   Generally: The single-family detached housing type consists of a single-family detached residence located on a privately owned lot with private yards on each side of the unit. There shall be not more than one such principal residential dwelling on each lot. See figure 8-3-2-2, "Single-Family Detached Unit", of this section.
FIGURE 8-3-2-2
SINGLE-FAMILY DETACHED UNIT
   B.   Standards: The lot and building standards for single-family detached units are set out in table 8-3-2-2, "Single-Family Lot And Building Standards", of this section.
TABLE 8-3-2-2
SINGLE-FAMILY LOT AND BUILDING STANDARDS
Zoning District
Minimum
Maximum
Minimum Lot Area
Lot Width
Front Yard
Side Yard
Corner Side Yard
Rear Yard
Height
Building Coverage
Zoning District
Minimum
Maximum
Minimum Lot Area
Lot Width
Front Yard
Side Yard
Corner Side Yard
Rear Yard
Height
Building Coverage
Agricultural (A)
1.5 acre
170'
50'
30'
50'
50'
35'
Agricultural residential (AR)
1.5 acre1
170'
50'
50'
50'
50'
35'
0.15
Planned residential (PR)
18,000 sq. ft.
90'
25'
25'
25'
35'
28'
0.3
Residential (R) subdistricts
See subsection C of this section
Residential (R-200)
5 acres
350'
50'
40'
50'
50'
35'
0.06
Residential (R-40)
40,000 sq. ft.
100'
50'
30'
50'
40'
30'
0.3
Residential (R-12)
12,500 sq. ft.
80'
25'
10'
30'
30'
30'
0.4
 
Note:
   1.    See section 8-2-3-11, "Residential Development", of this title, for additional lot area requirements for the agricultural residential (AR) district.
   C.   Dwellings In The Residential (R) District: The development standards are intended to allow flexibility to property owners in established neighborhoods within the residential (R) district to improve and expand their homes in a manner that is consistent with the character of the immediate area.
      1.   Subdistricts are established within the residential (R) district to accommodate variation in the forms and scale of residential development and subdivisions that have been built in the unincorporated areas of Grundy County under earlier zoning provisions.
      2.   The lot and building standards for residential (R) subdistricts are as shown in table 8-3-2-2, "Single-Family Lot And Building Standards", of this section.
   D.   Attached Accessory Residential Units: Accessory dwellings may be built on any existing or future single-family residential lot that meets the standards below. The accessory unit is exempted from the calculation as a dwelling unit when determining the maximum density in section 8-3-2-1, "Table 8-3-2-1, Residential Density Standards", of this chapter. Accessory units may be constructed as follows:
      1.   Transition: The plan shall provide a means of protecting adjoining residential uses or residentially zoned land from any impacts of the additional density and design of the unit. Increased buffer yard opacity, landscaping, setbacks from the adjoining homes, or prohibiting the lots that abut the site boundary from having the accessory units are techniques that may be required (see chapter 9, "Landscaping And Tree Protection", of this title).
      2.   Unit Standards: An accessory unit shall consist of not more than eight hundred fifty (850) square feet. It shall have no more than one bedroom or bathroom.
      3.   Unit Design: The applicant shall submit plans showing how the home will be designed to provide for an attached accessory unit. The unit shall be within the structure or above an attached garage. Specific design standards shall be provided for each one of the arrangements that are to be permitted. In no event shall a single-family or cluster lot smaller than six thousand (6,000) square feet contain an accessory unit.
      4.   Appearance: The accessory living unit, and any related changes to the property, shall be designed so that the appearance remains that of a single-family residence and is consistent with the single-family character of other residences in the neighborhood. Any new entrances shall be located on the side or in the rear of the building.
      5.   Other Forms Of Ownership Prohibited: The single-family dwelling or the accessory living unit shall not be converted to a condominium or any other form of legal ownership distinct from the ownership of the existing single-family dwelling. An accessory living unit shall be recorded by deed addendum, indicating the conditions and limitations of the approval granted.
      6.   Owner Occupied Principal Dwelling Required: The single-family dwelling to which an accessory living unit has been added shall be owner occupied.
      7.   Allowed As Part Of Housing: Accessory living units will be allowed only as part of single-family detached housing.
      8.   Access To Principal Dwelling: The accessory living unit shall have convenient and direct access to the principal dwelling unit.
      9.   Occupancy: The occupancy shall be limited to a specific extended family member(s). For the purposes of this title, "extended family" is defined as parents (and their spouses), grandparents (and their spouses), children (and their spouses), grandchildren and persons under legal guardianship. In the event that extended family member(s) vacate that unit, the administrative review permit shall expire and any new occupancy shall require a new administrative review permit application. (Ord. 10-001, 1-12-2010)

8-3-3-1: DWELLING UNIT MIX STANDARDS FOR PLANNED RESIDENTIAL DEVELOPMENTS:

   A.   Generally: All planned developments shall provide a mix of dwelling unit types.
   B.   Requirement: Table 8-3-3-1, "Dwelling Unit Mix Requirements", of this section, indicates the number of dwelling unit types that are required for developments of various sizes.
TABLE 8-3-3-1
DWELLING UNIT MIX REQUIREMENTS
 
Project Size (Total Units)
Minimum Number Of Types
Maximum Percentage Any Type
Minimum Percentage Any Type1
Less than 30
1
100
25
30 – 80
2
70
20
More than 80
3
55
10
 
Note:
   1.    This requirement applies even if more than the minimum number of housing types are provided.
   C.   Phasing:
      1.   When a development is to be phased, the maximum residential development capacity of the site shall be used for calculating the required mix.
      2.   When a parcel is broken up over time and developed as planned developments, the county may impose a mix based on the original property size to ensure an adequate mix of housing types. (Ord. 10-001, 1-12-2010)

8-3-4-1:NONRESIDENTIAL BULK STANDARDS:

Nonresidential bulk requirements include the following requirements:
TABLE 8-3-4-1
NONRESIDENTIAL BULK REQUIREMENTS
District And Use
Minimum
Maximum
Lot Area
Lot Width1
Front Yard1,2
Side Yard
Rear Yard1
Minimum Area Of Proposed Land Development1
Building Height
District And Use
Minimum
Maximum
Lot Area
Lot Width1
Front Yard1,2
Side Yard
Rear Yard1
Minimum Area Of Proposed Land Development1
Building Height
Agricultural (A) and agricultural residential (AR):
   All uses
5 acres
n/a
50 ft.
25 ft.
50 ft.
5 acres
35 ft.
Planned residential (PR):
   Institutional residential
2 acres
100 ft.
40 ft.
15 ft.
25 ft.
2 acres
35 ft.
   Office/retail/service
10,000 sq. ft.
100 ft.
40 ft.
25 ft.
25 ft.
1 acre
35 ft.
   All other uses
5 acres
100 ft.
50 ft.
25 ft.
30 ft.
5 acres
35 ft.
Residential (R):
   All permitted nonresidential uses
4 times the minimum lot area for single-family
2 times the yards required for single-family development
2 acres
35 ft.
Commercial general (CG) and commercial interchange (CI):
   Commercial retail
15,000 sq. ft.
100 ft.
40 ft.
15 ft.
25 ft.
1 acre
35 ft.
   Office/lodging
15,000 sq. ft.
100 ft.
40 ft.
15 ft.
25 ft.
2 acres
50 ft.
   Services
15,000 sq. ft.
100 ft.
40 ft.
15 ft.
25 ft.
1 acre
35 ft.
   All other uses
20,000 sq. ft.
100 ft.
40 ft.
20 ft.
25 ft.
1 acre
35 ft.
Industrial (I):
   Light industrial
20,000 sq. ft.
120 ft.
40 ft.
20 ft.
30 ft.
1 acre
4 stories or 50 ft., whichever is lower
   Heavy industrial
60,000 sq. ft.
150 ft.
50 ft.
30 ft.
30 ft.
2 acres
4 stories or 50 ft., whichever is lower
   Warehouse
1 acre
150 ft.
50 ft.
30 ft.
30 ft.
2 acres
3 stories or 40 ft., whichever is lower
   All other uses
20,000 sq. ft.
120 ft.
40 ft.
20 ft.
25 ft.
1 acre
4 stories or 50 ft., whichever is lower
 
Notes:
   1.    Along Route 47, frontages and yard requirements in excess of the minimum requirements specified here may be required. See chapter 10, "Overlay District", of this title.
   2.    Front yard refers to the front yard of a lot. A typical corner lot would have 2 front yards.
(Ord. 10-001, 1-12-2010)

8-3-4-2: NONRESIDENTIAL SCALE AND DESIGN REGULATIONS:

   A.   CG and CI districts:
      1.   Access: Nonresidential uses that are larger than ten thousand (10,000) square feet in floor area shall be located on lots that front on collector or arterial streets.
      2.   Prohibited Building Finish Materials: Building materials used for exterior walls of each elevation of all nonresidential buildings shall not use prefabricated metal siding or corrugated metal.
   B.   PR district: Nonresidential uses shall not have a floor area greater than:
      1.   Five thousand (5,000) square feet for a freestanding building;
      2.   Seven thousand five hundred (7,500) square feet for a multi- tenant building with common entrances; or
      3.   Nine thousand (9,000) square feet for a multi-tenant building with separate entrances. However, drugstores may be up to sixteen thousand (16,000) square feet and may be located in freestanding buildings or multi-tenant buildings of up to twenty five thousand (25,000) square feet, provided that the drugstore is the anchor tenant. (Ord. 10-001, 1-12-2010)