Mechanical code in Wisconsin
The mechanical code edition in force in Wisconsin, with its effective date, the adopting authority and an official link. Factual adoption data only — confirm with your local AHJ.
IMC (ICC) in force in Wisconsin
2021 IMC
- Effective
- September 1, 2025
- Verified
- June 28, 2026
Wisconsin HVAC/mechanical provisions (ch. SPS 364) adopt the 2021 IMC with state amendments as part of the updated Commercial Building Code, effective 2025-09-01. Confirmed against DSPS Commercial Building Code inserts and the Wisconsin Administrative Code.
State/province adoption is the baseline. Your local building department may amend it or enforce a different edition — always confirm with the authority having jurisdiction (AHJ) before you design, bid or pull a permit.
Mechanical code in Wisconsin: what applies on your job
Wisconsin has adopted 2021 IMC (IMC (ICC)) with an effective date of September 1, 2025. The body responsible for adoption and enforcement is Wisconsin Department of Safety and Professional Services (DSPS). This is the jurisdiction-wide baseline — your local building department may amend it or enforce a different edition, so confirm with the authority having jurisdiction before you design, bid or pull a permit.
Wisconsin HVAC/mechanical provisions (ch. SPS 364) adopt the 2021 IMC with state amendments as part of the updated Commercial Building Code, effective 2025-09-01. Confirmed against DSPS Commercial Building Code inserts and the Wisconsin Administrative Code. The official code text is published by the standards body and is available by purchase or membership — use the official link above to read it. We link and cite the code; we do not reproduce it.
Frequently asked questions
Which mechanical code edition is in force in Wisconsin?+
Wisconsin has adopted 2021 IMC (IMC (ICC)), effective September 1, 2025. The adopting authority is Wisconsin Department of Safety and Professional Services (DSPS). Verified June 28, 2026.
Does Wisconsin amend the base code?+
Wisconsin HVAC/mechanical provisions (ch. SPS 364) adopt the 2021 IMC with state amendments as part of the updated Commercial Building Code, effective 2025-09-01. Confirmed against DSPS Commercial Building Code inserts and the Wisconsin Administrative Code.
What does "edition in force" mean?+
It is the specific edition of a model code (for example the 2023 NEC, the 2021 IBC, or CSA C22.1:24) that a state or province has legally adopted and currently enforces. Codes are republished on roughly three-year cycles, and each jurisdiction adopts a new edition on its own schedule — often with amendments — so the edition in force varies by place and by discipline.
Does the whole state or province use the same code?+
Not always. Many jurisdictions set a statewide or provincial baseline edition, but local building departments (the authority having jurisdiction, or AHJ) can amend it or enforce a different edition. Some states leave most adoption to local jurisdictions, and a few large cities such as Chicago and New York City run their own codes. Always confirm with your AHJ.
Which model codes does this directory track?+
In the United States: the NEC (NFPA 70) for electrical, the ICC I-Codes (IBC/IRC) for building, the UPC (IAPMO) or IPC (ICC) for plumbing, the IMC/UMC for mechanical, the IFGC/NFPA 54 for fuel gas, and the IFC/NFPA 1 for fire. In Canada: the Canadian Electrical Code (CSA C22.1), the National Building, Plumbing and Fire Codes of Canada and their provincial editions, and CSA B149.1 for gas.
How do I read the official code for free?+
NFPA offers free read-only online access to many of its standards including the NEC, and the ICC publishes its I-Codes through a free online reading room. Canadian codes are typically published by CSA Group or the National Research Council and may require purchase or membership. Each result links to the official source.
Why does this directory not show the actual code text?+
Trade codes are copyrighted by their standards bodies (NFPA, ICC, IAPMO, CSA). This directory publishes only factual adoption data — which edition is in force, when it took effect, who the authority is, whether it is amended, and where to read it officially — and links you to the official source for the code text itself.
Methodology & sources
This record was verified against Wisconsin Department of Safety and Professional Services (DSPS) and the relevant standards body on June 28, 2026, and is next due for review by December 31, 2026. We publish factual adoption data only — never code text.
- Official state/provincial adoption authorities + NFPA, ICC, IAPMO and CSA standards bodies — verified June 28, 2026
- Wisconsin Department of Safety and Professional Services (DSPS) — Wisconsin Administrative Code ch. SPS 364 (docs.legis.wisconsin.gov); DSPS Commercial Building Code SPS 364 insert dated 2025-09-01 confirming the 2021 IMC. State amendments are free; underlying IMC requires purchase at iccsafe.org. — verified June 28, 2026
Last reviewed June 28, 2026. Estimates are indicative — verify against current product specs and local requirements before ordering.
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