Permit Requirements for Lodi, Wisconsin
For HVAC projects in Lodi, determining the correct permitting authority depends on whether the project site is located within the incorporated city limits or in an unincorporated area of Columbia County.
Authority Having Jurisdiction (AHJ)
Most jurisdictions require permits for HVAC work to ensure safety and code compliance. The governing body responsible for issuing these permits varies by specific location:
General HVAC Guidelines
Permits are usually required for new installations, structural modifications, or major repairs. While minor maintenance or cosmetic updates may be exempt, landowners should always verify local codes before work begins.
Help Us Improve This Guide
If you have found a direct link to a permit portal or a specific local ordinance for HVAC in this area, please submit an update.
Because Lodi is located within Columbia County, the following broader county regulations may also apply to your project:
Wisconsin, Columbia County Hvac Permit Regulations and County Ordinances for Unincorporated Areas
HVAC Permit Requirements in Columbia County, Wisconsin
Columbia County, Wisconsin, does not maintain a centralized county-level building and safety division that issues HVAC permits for all properties. Instead, building inspection and permitting authority is highly decentralized. In Wisconsin, the enforcement of the Uniform Dwelling Code (UDC) and other building regulations is typically handled at the local municipal level (town, village, or city).
Rules for Properties in Unincorporated Areas
For properties located in unincorporated areas (towns) within Columbia County, the following rules generally apply:
- Local Jurisdiction: You must contact the specific town government where your property is located to determine their unique building permit requirements. Many towns in Wisconsin contract with private building inspectors or have their own designated building inspector to enforce the Uniform Dwelling Code.
- Permit Necessity: While the county manages zoning, floodplain, and sanitary (septic) permits, HVAC, electrical, and plumbing permits are almost exclusively managed by the local municipality. You should assume that any significant HVAC work—such as installing a new furnace, central air conditioning, or heat pump—will require a permit from your local town building inspector.
- Verification Process: Before beginning any HVAC project, contact your Town Clerk or the local building inspector to confirm if a permit is required for your specific scope of work. Failure to obtain a required permit can lead to stop-work orders, fines, or complications during future property sales.
- County Role: The Columbia County Planning & Zoning Department handles land-use, zoning, and sanitary permits. They do not issue HVAC or general building permits for residential or commercial structures.
Resources to Learn More
The following statewide building codes and regulations apply universally to all jurisdictions within Wisconsin:
Wisconsin Hvac Legislation, Codes, and Guidelines
State Statutes and Codes Adopted
Wisconsin utilizes a hybrid approach to building codes, maintaining its own administrative code chapters that incorporate and amend national model codes. As of October 1, 2025, Wisconsin transitioned to the 2021 editions of the International Code Council (ICC) suite for commercial and multi-family residential buildings, with specific state-level amendments known as "Wisconsinisms."
- Commercial and Multi-Family Buildings: These are governed by the Wisconsin Commercial Building Code, found in Chapters SPS 361–366 of the Wisconsin Administrative Code. Chapter SPS 364 specifically addresses heating, ventilating, and air conditioning (HVAC) systems by adopting the International Mechanical Code (IMC) with Wisconsin-specific modifications.
- One- and Two-Family Dwellings: These are regulated under the Wisconsin Uniform Dwelling Code (UDC), found in Chapters SPS 320–325. HVAC requirements for these dwellings are specifically detailed in Chapter SPS 323.
Primary State Agencies
The primary agency responsible for the development, adoption, and oversight of building, fire safety, and energy efficiency codes in Wisconsin is the Department of Safety and Professional Services (DSPS). Within the DSPS, the Division of Industry Services (DIS) manages the programs for commercial buildings and one- and two-family dwellings, coordinating with local certified municipalities that handle plan reviews and inspections.
Resources to Learn More