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Title:
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Amendment of Municipal Code Chapters 17-2, 17-9 and 17-17 regarding open space, side setbacks for accessory buildings and allowable feature encroachments of Additional Dwelling Units (ADUs) in residential zoning districts
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Topic:
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MUNICIPAL CODE AMENDMENTS - Title 17 - Chicago Zoning Ordinance - Ch. 2 Residential Districts, MUNICIPAL CODE AMENDMENTS - Title 17 - Chicago Zoning Ordinance - Ch. 9 Use Regulations, MUNICIPAL CODE AMENDMENTS - Title 17 - Chicago Zoning Ordinance - Ch. 17 Terminology & Measurements, Land Use & Zoning-Tables & Index
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OFFICE OF THE MAYOR
CITY OF CHICAGO
LORI E. LIGHTFOOT
MAYOR
March 24, 2021
TO THE HONORABLE, THE CITY COUNCIL OF THE CITY OF CHICAGO
Ladies and Gentlemen:
At the request ofthe Commissioners of Buildings and Planning and Development, I transmit herewith an ordinance amending the Municipal Code of Chicago regarding additional Dwelling Units (ADUs).
Your favorable consideration of this ordinance will be appreciated.
O R I) I N A N C E
BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF CHICAGO:
SECTION 1. Section 17-2-0300 ofthe Municipal Code of Chicago is hereby amended by deleting the language stricken through and by inserting the underscored language, as follows:
17-2-0300 Bulk and density standards.
(Omitted text is unaffected by this ordinance)
17-2-0307 Rear Yard Open Space. All development in RS, RT, RM4.5 and RM5 districts is subject lo the following minimum rear yard open space standards, except as expressly allowed under the townhouse development standards of Section 17-2-0500.
District Minimum Rear Yard Open Space (square feet per dwelling unit/% of lot area, whichever is greater) Minimum Dimension on Any Side (feet) Diameter (in feet) of a Circle That Must Fit Within Rear Yard Open Space
(Omitted text is unaffected by this ordinance)
(Omitted text is unaffected by this ordinance)
17-2-0309 Side Setbacks.
17-2-0309-A Standards. All development in R districts is subject tothe following minimum side setback standards, except as expressly allowed under the townhouse development standardsof Section 17-2-0500. Reversed corner lots are subject to Sec. 17-2-0309-B. (See Sec. 17-17-0308 for rules governing the measurement of side setbacks.)
District Minimum Side Setback
RSI Detached house Principal residential building: Combined total width of side setbacks must equal 30% of lot width with neither required setback less than 5 feet or 10% of lot width, whichever is greater Principal nonresidential building (e.g., religious assembly and school buildings): 15 feet or 50%) of building height, whichever is greater
RS2 Detached house Principal residential building: Combined total width of side setbacks must equal 30% of lot width with neither required setback less than 4 feet or 10% of lot width, whichever is greater Principal nonresidential building (e.g., religious assembly and school buildings): 15 feet or 50% of building height, whichever is greater
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RS3 OotncluHl house Principal residential building: Combined total width of side setbacks must equal 20% of lot width with neither required setback less than 2 feet or 8% of lot width, whichever is greater Principal Nonresidential buildings (e.g., religious assembly and school buildings): 12 feet or 50% of building height, whichever is greater
(Omitted text is unaffected by this ordinance)
(Omitted text is unaffected by this ordinance)
17-2-0311 Building Height.
17-2-0311-A Standards. All residential buildings in R districts are subject to the following maximum building height standards, except as expressly allowed in Sec. 17-2-0311-B:
District Maximum Building Height (feet)
RSI Detached house Principal residential buildings: 30 Principal nonresidential buildings: None
RS2 Detached house Principal residential buildings: 30 Principal nonresidential buildings: None
RS3 Detached house Principal residential buildings: 30 Principal nonresidential buildings: None
(Omitted text is unaffected by this ordinance)
SECTION 2. Section 17-9-0200 ofthe Municipal Code of Chicago is hereby amended by deleting the language stricken through and by inserting the language underscored, as follows:
Section 17-9-0200 Accessory uses, buildings and structures.
(Omitted text is unaffected by this ordinance) i i-y-\}i.Mi ureneiai.
(Omitted text is unaffected by this ordinance)
17-9-0201-C An accessory building or structure, other than a coach house constructed pursuant to 17-9-0201- (F)(13), may not be constructed on any lot before the construction ofthe principal building to which it is accessory.
17-9-0201-D No accessory building The combination of all accessoiy buildings may not occupy more than 60% ofthe area of a required rear setback., except:
(Omitted text is unaffected by this ordinance)
17-9-0201-F C oach Houses
(Omitted text is una fleeted by this ordinance)
1 I. Coach houses in any RS2, RS3, RT or RM zoning district arc not subject to the open space provisions or"Sections 17-2-0307 or 17-2-0308^, but are subject to Chapter
16- 18 of this Code. Provided, however, that coach houses may not reduce existing open
space required under Sections 17-2-0307 or 17-2-0308 that serves [he principal building
on the zoning lot.
(Omitted text is unaffected by this ordinance)
A coach house may be constructed on a lot before the construction of the principal building to which it is accessory. When established prior to the principal building on a zoning lot, a coach house must be located entirely within [he rear setback of [he zoning lot in accordance with this Section 17-9-0201^ and will be exempt from the rear setback requirements of Section 17-2-0306-B.
The combination of all accessory buildings may not occupy more than 60% ofthe area of a required rear setback. Reserved.
(Omitted text is unaffected by this ordinance)
18. The following additional requirements shall apply to coach houses in the West, South, and Southeast Zones ofthe Additional Dwelling Unit-Allowed Areas:
a. A building permit may not be issued to add a coach house unit to a zoning lot with three or fewer est ablished dwelling units unless the principal building on the zoning lot is owner-occupied at the time of permit application.
(Omitted text is unaffected by this ordinance)
SECTION 3. Section 17-17-0300 of the Municipal Code of Chicago is hereby amended by inserting the language underscored, as follows:
17-17-0300 Measurements.
(Omitted text is unaffected by this ordinance)
17- 17-0309 Features Allowed to Encroach in Required Setbacks. Required setbacks
in all districts must be unobstructed and unoccupied from the ground to the sky except that
features are allowed to encroach into required setbacks to the extent indicated in the following
table:
Obstruction/Projection into Required Setback Front Side Rear
(Omitted text is unaffected bv this ordinance)
Chimneys that project no more than 18 inches into the setback Yes Yes Yes
Coach houses meeting the requirements of Section 17-2-201 -F. No No Yes
Coach houses that are constructed adjacent lo a public alley
must be set back at least two feet from the rear property line;
provided, however, that this two-foot setback is not required if
the coach house is located at least ten feet from the centerline of
the alley, as evidenced by a survey or other similar evidence
provided by the applicant and deemed acceptable by the Zoning
Administrator.
Satellite dish antennas, not exceeding 1 meter in diameter YesNl Yes Yes
(Omitted text is unaffected bv this ordinance)
SECTION 4. This ordinance shall take full force and effect upon its passage and approval.
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