Wisconsin, Clark County HVAC Permit Regulations and County Ordinances for Unincorporated Areas

Clark County Building and Safety Jurisdiction

In Clark County, Wisconsin, there is no single county-wide building department that manages HVAC permits for all properties. The county's Planning and Zoning Division primarily focuses on land use, zoning, and private onsite wastewater treatment systems (POWTS). Building permit authority, including requirements for HVAC work, is highly decentralized and often rests with individual townships or incorporated municipalities (cities and villages).

Rules for Properties in Unincorporated Areas

For properties located in unincorporated areas of Clark County, permit requirements are determined at the local level. Because Clark County is not uniformly zoned for building construction, you must contact the specific township where the property is located to determine if they require a building or HVAC permit. Some townships may have their own ordinances requiring permits for all projects, while others may be more selective. Additionally, if the project involves a new one- or two-family dwelling, it must adhere to the Wisconsin Uniform Dwelling Code (UDC), and you should verify with the local township or the state-contracted building inspector regarding the necessity of a permit for mechanical systems like HVAC.

Resources to Learn More

Note: The following state-wide building codes and regulations apply universally to all jurisdictions within Wisconsin, including Clark County.

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

Select a City in Clark County

If your project is located within incorporated city limits, you will likely need to follow municipal ordinances rather than county rules. Select your city below to view local regulations.

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