Plumbing contractor insurance in Illinois

Illinois puts insurance minimums in the plumbing law

Illinois licenses plumbers through the Illinois Department of Public Health's Plumbing Program, under the Illinois Plumbing License Law, 225 ILCS 320 (IDPH Plumbing Program). There's no journeyman and master split. The state licenses apprentice plumbers and plumbers, and it registers plumbing contractors every year as businesses.

The business registration has people rules. At least one member of every plumbing firm, or one officer of every plumbing corporation, must be a licensed plumber. Registration costs $150 a year on IDPH's form, and a plumber can be Plumber of Record for only one company.

Lawn sprinkler work is its own registration. Irrigation contractors register separately under Section 2.5 of the same law, with their own insurance rules and a $20,000 bond. If your shop installs irrigation alongside plumbing, plan for both.

Chicago runs its own system. State law lets a city of 500,000 or more set up its own board of plumbing examiners, and Chicago's Board of Plumbing Examiners, in the Department of Buildings, licenses plumbers, apprentices and plumbing contractors. Only a Chicago-licensed plumber who is the owner, a member or a corporate officer can apply for the city contractor license, and the business files a $20,000 performance bond payable to the City. Either way, a plumber licensed by IDPH or under Chicago's ordinance may do plumbing anywhere in Illinois.

Sewer work in Chicago is a separate license. A drain layer contractor license, in Class A, B or C, comes with a $50,000 performance bond. And an IDPH-licensed apprentice counts in Chicago only if the employer holds a Chicago plumbing contractor license.

Workers' comp for Illinois plumbers starts at one employee

Illinois has no small-employer cutoff for plumbing. The Workers' Compensation Act applies automatically to businesses it calls "extra hazardous," and that list includes altering, remodeling and maintaining any structure, plus construction and excavating (Illinois Workers' Compensation Commission). Hire one helper and you're covered by the Act.

The registration ties in, too. IDPH wants proof of comp with $500,000 of employer's liability, which is the part of a comp policy that defends you when an injury becomes a lawsuit. A contractor with no employees files an Affidavit of No Employees instead.

Owners have options. Sole proprietors and partners can elect to be covered. Bona fide corporate officers, meaning the president, vice president, secretary and treasurer, can withdraw themselves by written notice to the carrier.

Your subs matter at audit time. When the carrier audits your payroll after the policy year, a sub who can't produce a current comp certificate can be counted as your employee. Under NCCI rules used in most of our states, a set share of what you paid that sub becomes payroll on your policy when real payroll records aren't available. Ask every sub for a certificate before day one, and keep a copy. Our guide to comp for plumbing subcontractors covers the details.

Get the comp policy for your Illinois crew bound before the first paycheck, and set the employer's liability limit to at least the $500,000 IDPH requires. Get a quote for your plumbing business →

What drives Illinois plumbing claims

Record-setting cold

Illinois winters break pipes. On January 30, 2019, Chicago O'Hare hit 23 below zero, the city's coldest reading in 34 years, according to NWS Chicago. The next day, Rockford set its all-time record low of 31 below. Cold like that freezes supply lines in exterior walls and crawlspaces, and splits the ones that were already weak.

When a pipe you worked on gives way, the claim usually lands on general liability. GL often pays for the resulting damage to drywall and floors, depending on the policy wording, but it usually won't pay to redo your own work.

Lead service lines and very old pipe

The City's LeadSafe Chicago program says Chicago's water service lines were mostly made of lead until 1986, when lead was banned federally. And 39% of Chicago's 1.28 million housing units were built before 1940, per the 2024 American Community Survey.

Service-line and repipe work in that housing stock can disturb lead. Standard GL carries a pollution exclusion, and many contractor policies add broader ones, so contractors pollution liability is the usual way to cover contamination you cause or spread.

Felony-level comp enforcement

Illinois treats a knowing failure to carry comp as a Class 4 felony, with each day a separate offense. A negligent failure is a Class A misdemeanor. The Commission can also assess civil penalties of up to $500 a day, with a $10,000 minimum, personally against officers, partners and LLC members after a knowing and willful finding. And IDPH must refuse or revoke the registration of an uninsured employer.

Example scenario: A three-tech shop changes payroll services in March, and the comp renewal notice goes to an old email. The policy lapses for two weeks before anyone notices. That gap can put the shop's IDPH registration at risk, and an injury during those two weeks would be a much bigger problem.

Illinois plumbing markets we cover

Why Illinois plumber premiums land where they do

The statute sets floors, not targets. IDPH's minimums are $100,000 per occurrence and $300,000 aggregate for bodily injury, $50,000 for property damage or a $300,000 combined single limit, and $500,000 of employer's liability. Many GCs and property managers write in higher limits, and higher limits cost more.

The calendar matters. Registration renews every September 30, IDPH wants a fresh certificate each cycle, and it won't take continuous certificates. Line your policy dates up so a renewal never leaves a gap.

Comp follows payroll and job class. Your premium starts with payroll for each class of work times that class's rate per $100 of payroll, and your experience mod then moves it up or down. Moving a crew from service calls into sewer construction can change the class, so tell your carrier before audit, not after.

Bonds add a small line item. A shop that registers with IDPH and also holds a Chicago contractor license carries both a $20,000 state bond and a $20,000 city bond. Bond premiums are usually a percentage of the bond amount, based largely on credit. Your price depends on payroll, revenue, claims history, the work you do and the limits you choose. The plumber insurance cost guide has national medians. Get a quote for your plumbing business →

Our license in Illinois

Plumbing Insurance Group is a brand of The Allen Thomas Group, licensed in Illinois (License #3001339920, NPN 7642818). We quote Illinois plumbing contractors downstate and up north alike; our licenses page lists the rest of our footprint.