International Energy Conservation Code, residential
Wisconsin enforces the 2009 IECC residential
The 2009 International Energy Conservation Code (IECC) for residential buildings has been in force in Wisconsin since Jan 1, 2016. It applies statewide. Adopted by Wisconsin Department of Safety and Professional Services (DSPS). The legal citation is Wis. Admin. Code ch. SPS 322.
Record of adoption
Edition in force
2009 IECC
UDC Energy Conservation (ch. SPS 322)
Verified
- In force since
- Legal citation
- Wis. Admin. Code ch. SPS 322
- Adopted by
- Wisconsin Department of Safety and Professional Services (DSPS)
- Second reading
- Applies
- Statewide
- Also called
- SPS 322, UDC energy code
Some trackers describe the UDC energy chapter as purely Wisconsin’s own code, but DSPS says it was updated to the 2009 IECC effective Jan 1, 2016, and its commentary calls it the amended Wisconsin adoption of the 2009 IECC.
How Wisconsin adopts the IECC residential
DSPS changes residential energy requirements by amending the UDC’s ch. SPS 322 by agency rule, as in the 2009 IECC update that took effect Jan 1, 2016. The pending UDC update (SS 011-25) spans SPS 320 to 325, which includes ch. SPS 322.
Cycle. Irregular: the 2009 IECC-based chapter has been in force since 2016 and no newer edition has been adopted.
Laws, rulings, and other actions
- Legislation2025 Enrolled Joint Resolution 13 (introduced as 2025 Assembly Joint Resolution 133)
Proposed constitutional amendment (new art. IV, s. 35) letting the full Legislature suspend agency rules, in whole or part, by a joint resolution adopted by a majority of all members elected to each house.
Pending: first consideration passed the Assembly Feb 12, 2026, and the Senate Feb 18, 2026; second consideration by the 2027 Legislature and a statewide vote would follow, and no ballot date is set
legis.wisconsin.gov (opens in a new tab) - Court rulingEvers v. Marklein, 2025 WI 36 (Wisconsin Supreme Court)
Held the statutes letting JCRAR indefinitely object to proposed rules and suspend promulgated rules facially unconstitutional because they lack bicameralism and presentment, which cleared the stalled commercial building code update.
- Legislation2017 Senate Bill 15 / 2017 Wisconsin Act 57 (rulemaking reforms, REINS-type provisions)
Requires an economic impact analysis for proposed rules and makes an agency stop work on a rule with $10,000,000 or more in implementation and compliance costs over any two-year period unless a bill authorizing it is enacted.
Enacted Aug 9, 2017, published Aug 10, 2017
docs.legis.wisconsin.gov (opens in a new tab)
How it was checked
Verified
Two separate readings of the state’s own record agree, and the passage is on file word for word.
Read twice: a second, blind reading of the state’s record agreed with the first on .
The state’s record was last read on , from two source pages.
Evidence 2 sources
Sources for the record itself come first, the state’s own records ahead of others. A label marks a source about something else, such as an exception. A source marked secondary is not the state’s own record.
“Effective January 1, 2016, the Wisconsin Uniform Dwelling Code updated its energy conservation code to the 2009 International Energy Conservation Code.”
UDC (Uniform Dwelling Code / One- and Two- Family Dwellings) - DSPSWisconsin Department of Safety and Professional Services (DSPS)dsps.wi.gov (opens in a new tab)Agency pageRetrieved “per the amended Wisconsin adoption of the 2009 IECC”
Chapter SPS 322 - DSPS - Wisconsin.govWisconsin Department of Safety and Professional Services (DSPS)dsps.wi.gov (opens in a new tab)Agency pageRetrieved
Tracker cross-checks
Code adoption trackers are a cross-check. They are not Wisconsin’s own record.
DOE’s energycodes.govCross-checkAgrees with the record
Residential: 2009 IECC, mandatory statewide, effective 01/01/2016
Related pages
- See Wisconsin’s IECC residential on the map
- IECC residential adoption in every state
- All six codes in Wisconsin