Illinois Plumbing License: What Applies and What Does Not

Does a plumbing business need a license in Illinois?

Illinois issues 5 license classes for plumbers.

Illinois licenses plumbers statewide under the Illinois Plumbing License Law, administered by the Illinois Department of Public Health. Individuals hold the plumber or apprentice plumber license, and the business that performs plumbing for others registers separately as a plumbing contractor.

The plumbing business itself must be licensed or registered, not only the people doing the work.

A plumbing business registers annually with the Department as a plumbing contractor. The Department's registration form is filed in the business name and asks whether the business is a sole proprietorship, partnership, or corporation or limited liability company, and the named Plumber of Record must be the sole owner, a partner, an officer of the corporation, or a manager or member of the LLC.

This records what Illinois publishes, not a determination about your business. Scope, thresholds and local requirements are set by the issuing body, so confirm with them before you bid or file.

Verified 2026-09-03 against the primary source listed under Sources.

What the LLC has to do first

Several states license the plumbing company separately from the individual plumber, so the LLC and the license are two filings, not one.

The entity filing is separate from anything the license requires. In Illinois it is made with the Illinois Secretary of State. File directly with the state here. The order matters wherever the license is issued to the company rather than to a person: the entity has to exist before an application can name it.

Forming an LLC as a plumbing business in Illinois covers the filing itself, step by step.

Insurance Illinois plumbers are asked to show

Plumbing license and registration schemes commonly require proof of general liability cover, and water damage from a failed connection is the claim these policies are bought for.

We do not publish Illinois premium figures for this trade, so nothing here is a quote. Our business insurance guide for plumbers covers what each policy does and does not pay for.