Updated : 04/22/2024

Overview

Downers Grove, Illinois, adopted the 2021 International Residential Code (IRC), including Appendices AF, AK, and AQ, with amendments. Downers Grove, IL, Muni. Codes § 7.1201 (adoption) and § 7.1202 (amendments). Downers Grove, Illinois, adopted the 2021 International Building Code (IBC), including Appendix H and I, with amendments. Downers Grove, IL, Muni. Codes § 7.1101 (adoption) and § 7.1102 (amendments). No adoption of the International Existing Building Code (IEBC) was found. Note that the city has chosen not to include the IEBC and has deleted the references to the IEBC found in the IBC.

Helpful resources for Downers Grove, Illinois include the following.

• PLRB, Ordinance and Law Coverage Discussion for Illinois

Residential Building Code

Illinois has yet to adopt a statewide residential code. Local laws will control.See PLRB, Illinois Building Codes for more information on state level codes.

Downers Grove adopted the 2021 IRC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the model code here.

You can find information about amendments to the model code here.

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2021 IRC(Downers Grove, IL Sec 7.1201 2021 International Residential Code - Adoption)

...Sec 7.1201 2021 International Residential Code - Adoption...

Drip Edge

Drip Edge: yes

Ice Barrier

Are ice barriers required for Downers Grove ? Yes
Citation: Downers Grove, IL, Muni. Codes § 7.1202 (amendments).
Municipal Code https://downersgrove.municipalcodeonline.com/book?type=ordinances#name=Sec_7.1202_International_Residential_Code_-_Amendments
Comments:

The adoption of the residential code included an amendment stating that ice barrier underlayment is required at the eaves.

Ground Snow Load: 25 psf

Wind Speed (mph): 115 mph ultimate design wind speed

Topographic Effects: No

Special WInd Region: N/A

Wind-borne Debris: No

Seismic Design Category: A

Damage from Weathering: Severe

Damage from Frost Line Depth: Moderate to Heavy

Winter Design Temp: -4℉

Ice Barrier Requirement: Yes

Flood Hazards: DGMC Chapter 26 of the Downers Grove Municipal Code

Downers Grove, IL, Muni. Codes § 7.1202  (amendments).

Comments

Downers Grove, Illinois, adopted the 2021 International Residential Code (IRC), including Appendices AF, AK, and AQ, with amendments. Downers Grove, IL, Muni. Codes § 7.1201 (adoption) and § 7.1202  (amendments).

Existing Buildings

Existing buildings, meaning buildings that were built in accordance to code at the time of construction, typically merit extra consideration in a current updated code.

The city did not adopt Appendix AJ of the IRC regarding existing buildings. No adoption of the International Existing Building Code (IEBC) was found. Note that the city has chosen not to include the IEBC and has deleted the references to the IEBC found in the IBC.

Commercial Building Code

Downers Grove adopted the 2021 IBC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the code here.You can find information about amendments to the model code here.

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2021 IBC(Downers Grove, IL Sec 7.1101 2021 International Building Code Adoption)

...Sec 7.1101 2021 International Building Code Adoption...

Comments

Downers Grove, Illinois, adopted the 2021 International Building Code (IBC), including Appendix H and I, with amendments. Downers Grove, IL, Muni. Codes § 7.1101 (adoption) and § 7.1102 (amendments).

Existing Buildings

No adoption of the International Existing Building Code (IEBC) was found. Note that the city has chosen not to include the IEBC and has deleted the references to the IEBC found in the IBC.

Other Building Codes