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Willowbrook City Zoning Code

CHAPTER 3

DISTRICT SPECIFIC STANDARDS

9-3-1: BULK AND DIMENSIONAL STANDARDS:

   (A)   Bulk And Dimensional Standards: Table 9-3-01 establishes the bulk and dimensional standards for the development or the use of a lot in each zoning district.
Table 9-3-01: Bulk and Dimensional Standards
Standard
R-1
R-2
R-3
R-4
R-5
B
LOR
M-1
I
Table 9-3-01: Bulk and Dimensional Standards
Standard
R-1
R-2
R-3
R-4
R-5
B
LOR
M-1
I
Lot Standards (Minimum)
Lot Area (sq. ft.)
20,000
11,000
9,000
- -
- -
- -
43,560
43,560
- -
Lot Area / DU(sq. ft.)
- -
- -
- -
4,500
2,000
 
 
 
 
Lot Width (ft.)
90
70
70
50
50
50
50
50
50
Yard Setbacks (Minimum) (1)
Front (ft)
60(2)
40(2)
40(2)
40
40
20
50
40
30
Exterior Side (ft.)
50(2)
40(2)
40(2)
40
40
20
50
40
20
Interior Side (ft.)
15
8
8
15(3)
15(3)
10
20
20
10
Rear (ft.)
50
30
30
30
35
40
30
20
30
Building Standards (Maximum)
Building Height (ft.)
35
35
35
35
45
40
40
40
40
Impervious Surface Coverage (%)
35
40
45
50
55
70
60
70
60
Notes:
(1) Other requirements of this title, such as but not limited to those for landscape and parking, may further impact yard setback depth.
(2) The front or exterior side setback shall be determined in infill situations as specified in Section 9-3-03(A).
(3) Parcels shall be exempt from the interior side yard requirement where dwellings are attached with a parti wall.
 
(Ord. 23-0-05, 1-23-2023)

9-3-2: CALCULATING DIMENSIONAL STANDARDS:

   (A)   Lot Width: Lot width shall be measured as the distance between the side lot lines of a lot at right angles to its depth along a straight line parallel to the front lot line.
Figure 3.1. Lot Width
 
   (B)    Lot Widths For Lots That Abut A Cul-de-Sac: The lot width of all lots which abut a cul-de-sac may be reduced by a maximum of fifty percent (50%) of the required lot width for the district in which it is located, as measured from the front lot line.
   (C)   Yard Setbacks:
      1.   A required yard setback shall be measured as the horizontal distance from the center point of the applicable lot line into the interior of the lot for the minimum distance specified in Table 9-3-01.
      2.   The span of a yard setback shall be measured as follows.
         (a)   Front Yard: From the interior side lot line to the other interior side lot line or street side lot line as applicable.
         (b)   Exterior Side Yard: From the front yard setback line to the rear lot line.
         (c)   Interior Side Yard: From the front yard setback line to the rear yard setback line.
         (d)   Rear Yard:
            (1)   From the interior side lot line to the other interior side lot line; or
            (2)   From the interior side lot line to the street side yard setback line.
Figure 3.2. Yard Setbacks
 
   (D)   Building Height: Building height shall be the vertical distance from the average lot grade to the highest point of the building. The highest point of the building shall be measured as follows for different roof types.
      1.   Flat And Shed Roofs: To the highest point of the roof.
      2.   Gable, Hip, And Gambrel Roofs: To the mean height between the principal eave and the peak of the roof.
      3.   Mansard Roofs: To the deck line of the roof.
Figure 3.3. Building Height
 
   (E)   Average Lot Grade: Average lot grade shall be measured prior to the commencement of any construction activity, including grading. Average lot grade shall be the average of the grade at each lot corner.
Average Lot Grade Example Calculation
Figure 3.4 Average Lot Grade
 
(Ord. 23-0-05, 1-23-2023)

9-3-3: TRANSITION REQUIREMENTS FOR RESIDENTIAL USES:

   (A)   Transitioning In Infill Situations: Single-family detached dwellings in the R-1, R-2, and R-3 Single-Family Districts shall be constructed with transition features subject to this Section. Buildings with a height that exceeds that of neighboring existing homes by one (1) story or more shall provide a transition using at least two (2) of the following techniques.
      1.   Building height and mass shall step down along the shared property line to meet the height of the existing neighboring home along a minimum of fifty percent (50%) of the subject building’s length. The stepped down portion of the building shall be a minimum of ten (10) feet in depth;
      2.   The side yard setback at least ten (10) feet beyond that which is required in Table 9-3-01 shall be provided;
      3.   Dormers and sloping roofs shall be provided to accommodate upper story floor area.
Figure 3.5. Transitioning In Infill Situations
 
(Ord. 23-0-05, 1-23-2023)

9-3-4: EXCEPTIONS TO BULK AND DIMENSIONAL STANDARDS:

   (A)   Residential Setback Averaging In Infill Situations: When a lot has a front or exterior side yard on a street where fifty percent (50%) or more of the frontage on the same side of the street in the same block has been developed, the front or exterior side yard requirement shall be the average of all the existing front or exterior side setbacks of all the buildings on the same side of the street whose setbacks are less that the Zoning District requirement. In no event shall the front or exterior side yard be less than thirty (30) feet in the R-1 Single-Family District or less than twenty-five (25) feet in the R-2 Single-Family and R-3 Single-Family Districts.
   (B)   Allowed Yard Encroachments: Encroachments into the yard requirements specified in Section 9-3-01 shall be allowed as specified in Table 9-3-04(B). The following key shall be utilized in the interpretation of Table 9-3-03(B).
   1.   F = Front Yard.
   2.   ES = Exterior Side Yard.
   3.   IS = Interior Side Yard.
   4.   R = Rear Yard.
   5.   X = Permitted Obstruction.
Table 9-3-04(B): Allowed Encroachments
Encroachment
F
ES
IS
R
Standard
Other Requirement(s)
Table 9-3-04(B): Allowed Encroachments
Encroachment
F
ES
IS
R
Standard
Other Requirement(s)
Antenna, shortwave radio, transmitting and receiving, citizen band radio, transmitting and receiving, broadcast band radio, receiving
 
 
 
X
See Section 9-4-11(K)
Antenna, television, receiving
 
 
 
X
minimum setback of 15 feet from lot line
not more than 2 antennae on any 1 structure
Arbor, trellis
X
X
X
X
maximum projection of 2 feet
maximum height and width of 8 feet
Balcony
X
X
X
X
maximum projection of 4 feet
n/a
Barbecue equipment, permanent
 
 
 
X
See Section 9-4-11(D)
Bay window, wing wall
X
X
X
X
maximum projection of 2 feet
n/a
Chimney
X
X
X
X
maximum projection of 2 feet
n/a
Detached garage
 
 
X
X
minimum setback of 10 feet from rear lot line and 5 feet from interior side lot line
See Section 9-4-11(c)
Driveway
X
X
X
X
minimum setback of 5 feet from lot line
See Section 9-5-03
Eave, gutter, permanent downspout
X
X
X
X
maximum projection of 3 feet
n/a
Electric vehicle charging station
X
X
X
X
minimum setback of 10 feet from lot line
allowed in multifamily, mixed use, and nonresidential development only
Fall out shelter
 
 
 
X
minimum setback of 10 feet from lot line
n/a
Fence, wall
X
X
X
X
See Section 9-5-05
Fire escape
 
 
 
X
maximum projection of 5 feet
n/a
Flagpole
X
X
X
X
minimum setback of 10 feet from lot line
no more than 3 per lot
Ground/wall mounted mechanical equipment
 
 
X
X
minimum setback of 5 feet from lot line
n/a
Landscape planting
X
X
X
X
n/a
maximum of 18 inches above curb level or edge of pavement if there is no curb within 15 feet of the lot corner formed by the intersection of 2 right-of-way lines
Lawn ornament, furniture, ornamental, lighting, statuary
X
X
X
X
minimum setback of 5 feet from lot line
n/a
Non-mechanical laundry drying equipment
 
 
 
X
minium setback of 5 feet from lot line
n/a
Nonresidential awning, canopy, marquee
X
X
X
X
maximum projection of 1/3 of district yard standard
n/a
Open terrace, porch, patio, deck
 
 
X
X
minimum setback of 10 feet from rear lot line and 5 feet from interior side lot line
See Section 9-4-11(D)
Parking
X
X
X
X
See Section 9-5-01
Loading
 
 
X
X
See Section 9-5-01(F)
Pergola, gazebo
 
 
 
X
See Section 9-4-11(D)
Playground equipment
 
 
 
X
See Section 9-4-11(D)
Pool house
 
 
 
X
See Section 9-4-11(C)
Residential awning, canopy
X
X
X
X
maximum projection of 3 feet in front, exterior side, and rear yards; maximum projection of 1.5 feet in interior side yard
n/a
Sign
X
X
X
X
See Section 9-6-03
Storage shed
 
 
X
X
minimum setback of 10 feet from rear lot line and 5 feet from interior side lot line
See Section 9-4-11(D)
Steps, stoops
X
X
X
X
maximum projection of 4 feet in front, exterior side, and rear yards; maximum projection of 3 feet in interior side yard
n/a
Swimming pool, hot tub
 
 
 
X
See Section 9-4-11(D)
Vegetable garden
 
 
 
X
minimum setback of 5 feet from lot line
n/a
Walkway
X
X
X
X
n/a
maximum width of 5 feet
 
(Ord. 23-0-05, 1-23-2023)

9-3-5: PERMITTED, SPECIAL, AND TEMPORARY USES:

   (A)   Permitted Uses: Uses which are marked as "P" in the table shall be allowed subject to all applicable regulations of this UDO.
   (B)   Special Uses: Uses which are marked as "S" in the table shall be allowed upon the approval of a Special Use Permit as detailed in Section 9-9-05.
   (C)   Temporary Uses: Uses which are marked "T" in the table shall be allowed upon the approval of a Temporary Use Permit as detailed in Section 9-9-02(G).
   (D)   Prohibited Uses: A blank space in the table indicates that a use type is not allowed in the respective zoning district unless it is otherwise expressly allowed by other regulations of this UDO.
   (E)   Uses Not Listed: If a proposed use is not listed in the table, the Village Administrator or their designee shall determine if the use is substantially similar to a use listed on the table. If it is, they shall treat the use in the same manner as the substantially similar use. If not, the use shall be regarded as prohibited.
   (F)   Additional Regulation: If a use has use specific standards the table cell is brown. Use specific standards shall apply to permitted, special, and temporary uses.
Permitted, Special, and Temporary Uses by Zoning District
Table 9-3-05(A): Permitted, Special, and Temporary Uses by District
Use
Additional Regulation
R-1
R-2
R-3
R-4
R-5
B
LOR
M-1
I
Table 9-3-05(A): Permitted, Special, and Temporary Uses by District
Use
Additional Regulation
R-1
R-2
R-3
R-4
R-5
B
LOR
M-1
I
Agricultural and Open Space Uses
Keeping of Livestock
 
 
 
 
 
 
 
 
 
 
Parks and Natural Areas
 
P
P
P
P
P
P
P
P
P
Residential Uses
 
 
 
 
 
 
 
 
 
 
Dwelling, Single Family Detached
 
P
P
P
 
 
 
 
 
 
Dwelling, Duplex
 
 
 
P
P
 
 
 
 
Dwelling, Townhome
 
 
 
P
P
 
 
 
 
Dwelling, Multiple Family, up to 8 units
 
 
 
S
P
 
 
 
 
Dwelling, Multiple Family, 8+ units
 
 
 
 
S
 
 
 
 
Dwelling, Multiple Family, Complex
 
 
 
 
S
 
 
 
 
Group Homes, up to 8 residents
P
P
P
P
P
 
 
 
 
Group Homes, 9+ residents
S
S
S
S
S
 
 
 
 
Senior Housing, Dependent
 
 
 
S
S
 
 
 
 
Senior Housing, Independent
 
 
 
S
S
 
 
 
 
Place of Assembly Uses
Indoor Commercial Place of Assembly, 3,000 sq. ft. or less
 
 
 
 
 
 
P
P
P
 
Indoor Commercial Place of Assembly, More than 3,000 sq. ft.
 
 
 
 
 
 
S
S
S
 
Outdoor Commercial Place of Assembly
 
 
 
 
 
 
S
S
S
 
Indoor Non-Commercial Place of Assembly, 3,000 sq. ft. or less
 
P
P
P
P
P
 
 
 
P
Indoor Non-Commercial Place of Assembly, More than 3,000 sq. ft.
 
 
 
 
 
 
 
 
 
P
Outdoor Non-Commercial Place of Assembly
 
 
 
 
 
 
 
 
 
S
Retail Uses
Adult Oriented Business
 
 
 
 
 
 
 
S
 
Adult Use Cannabis Dispensary
 
 
 
 
 
S
 
 
 
Alcohol/Liquor Sales
 
 
 
 
 
 
P
S
 
 
Boat Showroom
 
 
 
 
 
 
S
 
 
 
Firearms Retailer
 
 
 
 
 
 
S
 
S
 
Garden Supply Store
 
 
 
 
 
 
P
 
P
 
General Retail, 3,000 sq. ft. or less
 
 
 
 
 
S
P
P
P
S
General Retail, 3,000 sq. ft. or more
 
 
 
 
 
 
P
 
 
 
Multitenant Shopping Center
 
 
 
 
 
 
S
 
 
 
Pawn Shop
 
 
 
 
 
 
S
 
S
 
Service and Office Uses
Acute Care Center
 
 
 
 
 
 
P
P
 
 
Adult Day Care
 
P
P
P
P
 
P
P
 
 
Animal Hospital, Veterinarian
 
 
 
 
 
S
P
 
 
Body Art Establishment
 
 
 
 
 
 
 
S
P
 
Kennel
 
 
 
 
 
S
S
 
 
Check Cashing/Pay Day Loan Store
 
 
 
 
 
 
 
S
 
 
Child Care Center
 
P
P
P
P
 
P
P
 
 
Coworking Space
 
 
 
 
 
 
P
P
 
 
Financial Institution
 
 
 
 
 
 
S
S
 
 
Hospital
 
 
 
 
 
 
 
S
 
 
Laundry, Self Service
 
 
 
 
 
 
S
S
 
 
Massage Therapy
 
 
 
 
 
 
S
S
 
 
Personal Service, 3,000 sq. ft. or less
 
 
 
 
 
 
P
P
 
 
Personal Service, more than 3,000 sq. ft.
 
 
 
 
 
 
P
P
 
 
Professional Office, 3,000 sq. ft. or less
 
 
 
 
 
 
S
P
 
 
Professional Office, more than 3,000 sq. ft.
 
 
 
 
 
 
 
P
 
 
Video Gaming Cafes
 
 
 
 
 
 
S
 
 
 
Eating and Drinking Uses
Bar/Tavern
 
 
 
 
 
 
S
 
 
 
Brew Pub
 
 
 
 
 
 
P
S
S
 
Carry-Out Facility
 
 
 
 
 
 
P
 
 
 
Restaurant
 
 
 
 
 
 
P
 
 
 
Lodging Uses
Bed and Breakfast
S
S
S
 
 
 
 
 
 
Hotel
 
 
 
 
 
 
S
 
 
 
Motel
 
 
 
 
 
 
 
 
 
 
Vehicle Related Uses
Car Wash
 
 
 
 
 
S
 
S
 
Fuel Sales
 
 
 
 
 
S
 
S
 
Motor Vehicle Sales/Rental
 
 
 
 
 
S
 
S
 
Minor Motor Vehicle Service
 
 
 
 
 
S
 
P
 
Major Motor Vehicle Service
 
 
 
 
 
 
 
S
 
Industrial Uses
Artisan Manufacturing
 
 
 
 
 
P
P
P
 
Building Material, Machinery, and Equipment Sales or Storage
 
 
 
 
 
S
 
 
 
Brewery/Winery/
Distillery Production Facility
 
 
 
 
 
 
S
P
P
 
Contractor Shop
 
 
 
 
 
 
S
 
P
 
Crematorium
 
 
 
 
 
 
 
 
S
 
Dry Cleaner, Processing On-Site
 
 
 
 
 
 
 
 
S
 
Greenhouse, Wholesale
 
 
 
 
 
 
S
 
P
 
Laundry, Commercial
 
 
 
 
 
 
 
 
S
 
Light Manufacturing, Assembly, Fabrication
 
 
 
 
 
 
 
 
P
 
Materials Salvage Yard/Recycling Operations
 
 
 
 
 
 
 
 
S
 
Mining and Aggregate Extraction
 
 
 
 
 
 
 
 
S
 
Mini-Warehouse/
Personal Storage
 
 
 
 
 
 
 
 
S
 
Research and Development
 
 
 
 
 
 
 
P
P
 
Warehouse, Distribution/
Storage
 
 
 
 
 
 
 
 
P
 
Accessory Uses
Accessory Dwelling, Detached/Attached
S
S
S
S
 
 
 
 
 
Accessory Dwelling, Internal
P
P
P
P
 
 
 
 
 
Accessory Building
P
P
P
P
P
P
P
P
P
Accessory Retail/ Restaurant
 
 
 
 
 
 
 
 
P
 
Accessory Structure
P
P
P
P
P
P
P
P
P
Drive-Through Facility
 
 
 
 
 
S
 
 
 
Food Cart or Truck, Accessory
 
 
 
 
 
S
S
S
 
Garden
 
P
P
P
P
P
 
 
 
 
Home Based Child Care (8+ children)
 
S
S
S
S
S
 
 
 
 
Home Occupation
P
P
P
P
P
 
 
 
 
Outdoor Display/ Sale of Merchandise, Permanent
 
 
 
 
 
P
 
 
 
Outdoor Seating for Eating and Drinking Uses
 
 
 
 
 
P
 
 
 
Outdoor Storage, Permanent
 
 
 
 
 
 
 
S
 
Small Cell Wireless Facilities
 
 
 
 
P
P
P
P
P
Solar Energy Collection System, Canopy
P
P
P
P
P
P
P
P
P
Solar Energy Collection System, Ground
P
P
P
P
P
P
P
P
P
Solar Energy Collection System, Roof
P
P
P
P
P
P
P
P
P
Temporary Uses
Civic Uses of Public Property
 
 
 
 
 
 
 
 
 
P
Contractors Trailers and Real Estate Model Units
 
T
T
T
T
T
T
T
T
T
Food Cart or Truck, Temporary
 
 
 
 
 
S
S
S
 
Outdoor Display/Sale of Merchandise, Temporary
 
 
 
 
 
 
T
T
T
 
Short Term Rental
Parking of Trailers, Boats, and Other Vehicles
T
T
T
T
T
 
 
 
 
Portable Outdoor Storage Device
T
T
T
T
T
T
T
T
T
 
(Ord. 23-0-05, 1-23-2023)