New Wisconsin Electrical and Plumbing Codes Now in Effect

The Wisconsin Department of Safety and Professional Services (DSPS) has updated the state electrical and plumbing codes. Both took effect September 1, 2026.

Electrical (Ch. SPS 316): Wisconsin now uses the 2023 National Electrical Code (NFPA 70) with state amendments. The 2017 edition is no longer in effect. Some key changes:

• Whole-home surge protection is now required.
• There are new limits on how many feeders can supply a building or structure.
• Services on vacant land now need a permit and inspection.

Plumbing (Chs. SPS 381-387): The Wisconsin Uniform Plumbing Code has been revised under Clearinghouse Rule CR 26-019.

Code officials, contractors and designers should check that new permits, plans and inspections follow the current editions.

• Read Chapter SPS 316, Electrical
• Read Chapters SPS 380-387, Plumbing
• Read the DSPS news release