Updated : 10/15/2024

Overview

Decatur, Illinois, adopted the 2021 International Residential Code (IRC), including appendices AA, AB, AC, AD, AG, AH, AJ, AM, AO, AQ, AW, with amendments. Decatur, IL, City Code Chapter 67.2 (adoption and amendments). Decatur, Illinois, adopted the 2021 International Building Code (IBC), with amendments. Decatur, IL, City Code Chapter 67 (adoption and amendments). For Decatur, Illinois, no local adoption and no local amendments of an existing building code were located. 

Helpful resources for Decatur, Illinois include the following.

• Jurisdiction's Information Page(s):
  • Decatur, IL Website
  • Decatur, IL City Code
  • Decatur, IL Building Code
• 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.

Decatur 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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Drip Edge

Drip Edge: yes

Ice Barrier

Are ice barriers required for Decatur ? Yes
Citation: Decatur, IL, Muni. Code Chapter 67.2 (amendments).
Municipal Code https://www.decaturil.gov/DocumentCenter/View/172/Chapter-672---Residential-Building-Code-PDF
Comments:

(c) Table R301.2 – Add the following values to the table:

Ground Snow Load, 20 PSF

Wind-Design Speed 107 MPH

Seismic Design Category, B

Weathering, Severe

Frost Line Depth, 36 inches

Termite, moderate to heavy

Ice Barrier underlayment required, yes

Flood Hazards, 8/1/79

Air Freezing Index, 1265

Mean Annual Temp. 51.9 F.

Government Officials

Comments

Decatur, Illinois, adopted the 2021 International Residential Code (IRC), including appendices AA, AB, AC, AD, AG, AH, AJ, AM, AO, AQ, AW, with amendments. Decatur, IL, City Code Chapter 67.2 (adoption and 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.

Please refer to appendix AJ of the adopted 2021 IRC. 

For Decatur, Illinois, no local adoption and no local amendments of an existing building code were located. 

Commercial Building Code

Decatur 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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No results were located with the automated search.

Comments

Decatur, Illinois, adopted the 2021 International Building Code (IBC), with amendments. Decatur, IL, City Code Chapter 67 (adoption and amendments). 

Existing Buildings

For Decatur, Illinois, no local adoption and no local amendments of an existing building code were located. 

Other Building Codes