# Who is allowed to repipe a house in Chicago? > Who can repipe in Chicago: the City plumbing contractor license on top of a state license, the $20,000 bond and owner exemption. Check before you hire. URL: https://chicagolakerepiping.com/guide/who-can-repipe-in-chicago/ Learn Why a state plumbing license is not enough inside the city limits, what the single-family owner exemption allows and doesn't, how to check the contractor on your permit, and why some plumbers turn the work down. Last Updated: October 25, 2026 **Inside the City of Chicago, a repipe has to be done by a contractor holding a City of Chicago plumbing contractor license, or by the owner of a detached single-family home doing their own work.** A State of Illinois plumbing license alone does not qualify a business to work in the city. The licensed contractor is named on the permit, and a City inspector checks the work. [Chicago Lake Repiping](https://chicagolakerepiping.com/) offers and manages [whole-house repiping](https://chicagolakerepiping.com/whole-house-repiping/) across Chicago and nearby Cook County suburbs. The work is carried out by licensed and insured plumbing contractors, Chicago-licensed for jobs inside the city. This guide explains the license layers, the one exemption, how to check who is on your job and why the license changes who will take the work. Key takeaways - Installing, altering or repairing water supply piping in Chicago requires a City of Chicago plumbing contractor license. - A state-licensed contractor must also get the City license. The firm needs a Chicago-licensed plumber as a principal and files a $20,000 performance bond. - Owners of a detached single-family home may do their own plumbing, to code and inspected. Two-flat owners have no such exemption. - The contractor named on the permit is the one who must do the work; Express permits cannot be transferred. ## The license on top of the license Illinois licenses plumbers statewide through the Illinois Department of Public Health. Chicago adds its own layer. The Department of Buildings requires a [City of Chicago plumbing contractor license](https://www.chicago.gov/city/en/depts/bldgs/supp_info/TLdetails/PLcontractor.html) to install, alter, repair or maintain water piping in the city, and a contractor licensed by the State of Illinois must also obtain the City license. The application can only be filed by a plumber licensed by the City of Chicago, and the business must file a $20,000 performance bond with the City Clerk. The individual plumbers on a job can hold IDPH-issued licenses; the City recognizes them when their employer holds the Chicago plumbing contractor license. What matters for a homeowner is the contractor: the business that signs the contract, pulls the permit and answers for the work. The City’s rule has one small carve-out, for minor repairs on a person’s own premises, which does not stretch to replacing a building’s water piping. ## The single-family owner exemption The owner, occupant or lessee of a detached single-family residence may personally do their own plumbing. It still has to meet the Chicago Plumbing Code and pass inspection, and on the Express permit the owner files the City’s Form 401 with identification in place of a contractor’s acceptance. The exemption is narrower than it sounds. It covers doing the work yourself, not hiring help: the owner may not hire anyone other than a licensed plumbing contractor. A handyman, a friend in the trades without the City license or a suburban plumber without it cannot be brought in under the owner’s permit. And the exemption is for a detached single-family home only. A [two-flat](https://chicagolakerepiping.com/two-flat-repiping/) owner who lives in one unit does not qualify, so every two-flat repipe in the city is a licensed contractor’s job. A repipe is also a large job for a first plumbing project. Copper inside the city means cutting, cleaning and joining rigid tube in place, with soldering, brazing or press fittings, then a pressure test before the walls close and a flush after the cutover. The [Chicago repiping permit guide](https://chicagolakerepiping.com/guide/chicago-repiping-permit/) covers what the application needs either way. ## How to check who is on your job Homeowners search for a “Chicago plumber license lookup” because a state license number on a truck or website does not settle it. Three checks do: - **Ask for the City of Chicago plumbing contractor license number**, and the name of the licensed business. A state number alone is not the City license. - **Match the permit.** On an Express permit, the Chicago-licensed contractor has to accept the job electronically before the permit issues, and the work must be done by the contractor or homeowner named on it. The permit cannot be transferred to another contractor. If the name on your quote differs from the name on the permit, ask why. - **Watch the inspection.** Inspection results for the permit are posted online, so an owner can see that the inspection was requested and how it went. Condo associations add paperwork of their own. Homeowners report boards asking for the plumber’s license and a certificate of insurance before a unit job, even a small one, and Express work on condominium property needs a signed approval letter from the association. Having those ready keeps a [riser](https://chicagolakerepiping.com/riser-replacement/) or unit job from stalling at the management office. ## Why some plumbers turn the work down Homeowners report difficulty finding a plumber who will quote, follow up on or take on work on old galvanized pipe and lead service lines in Chicago. Some report several estimators visiting and never hearing back; others report that small repairs on galvanized are hard to get done or warrantied, and that a corroded joint in a ceiling was turned away by firms that only take larger jobs. Willing contractors exist, and owners in the same accounts did get the work done. Several reasons for the friction trace back to the rules and the building: - **The City license narrows the field.** A suburban plumber without the Chicago contractor license cannot take a job in the city at all. - **Copper is the material.** Chicago’s code lists copper, not PEX, for water distribution, so a plumber who prefers PEX in the suburbs declines it in the city because the code does, not by choice. The [guide to PEX in Chicago](https://chicagolakerepiping.com/guide/is-pex-allowed-in-chicago/) covers why. - **Old pipe is risky to touch.** Threaded galvanized can crack the next fitting when one is turned, which is why some plumbers are reluctant to warranty a spot repair. The [galvanized pipes guide](https://chicagolakerepiping.com/guide/galvanized-pipes-chicago-homes/) explains the mechanism. - **Occupied, finished houses take planning.** A repipe through plaster with people living in the house means openings, protection and staged shutoffs. Homeowners report that plumbers with easier work available pass on jobs that need holes cut in walls. ## Lead service lines and the license The same license applies when the job includes a [lead service line](https://chicagolakerepiping.com/lead-service-line-replacement/). Under the City’s Homeowner-Initiated program, the owner hires a plumbing contractor licensed in Chicago to replace the full lead line as a standalone job, the contractor tells the Department of Buildings that the job is eligible for the fee waiver, and the City waives the permit fees and connects the new line to the main. Homeowners report quotes from plumbers who did not understand how to get the waiver, so ask how the contractor files it. The contractors can be hired for a private full replacement; the [guide to repiping after a lead service line replacement](https://chicagolakerepiping.com/guide/repipe-after-lead-service-line-replacement/) covers how the two jobs fit together. ## Outside the city The suburbs rely on the state’s licensing, with local registration in some places. Park Ridge, for example, asks plumbing contractors to provide their IDPH plumbing contractor registration, a plumber’s license and insurance before working under a permit there. In unincorporated Cook County, a registered plumbing contractor applies for the permit with the County’s Department of Building and Zoning. The City of Chicago license is not required outside the city limits, but each permit office has its own rules, confirmed per address before work starts. See the [Oak Park](https://chicagolakerepiping.com/service-areas/oak-park/) and [Evanston](https://chicagolakerepiping.com/service-areas/evanston/) pages. ## Where to start Before comparing prices, confirm that each quote comes from a contractor who can work at your address: City of Chicago license inside the city, local registration where a suburb asks for it. Then compare scope line by line with the [Chicago repipe cost guide](https://chicagolakerepiping.com/guide/repiping-cost-chicago/). Call the number on this page or use the estimate form to set up a walk-through. ## Questions about this guide ### How do I check that a plumber can legally work in Chicago? Ask for the contractor's City of Chicago plumbing contractor license number, not only a state license number, and make sure that same contractor is the one named on the permit. On an Express permit the licensed contractor has to accept the job before the permit issues, and the permit cannot be transferred to anyone else. ### Can a suburban plumber with an Illinois license repipe a house in Chicago? Only if the business also holds a City of Chicago plumbing contractor license. The City requires a state-licensed contractor to obtain the Chicago license as well, the firm must have a Chicago-licensed plumber as a proprietor, member or officer, and it files a $20,000 performance bond with the City Clerk. ### Can I repipe my own single-family house in Chicago? Yes, if you own, occupy or lease a detached single-family home and do the work yourself. It must meet the code and pass inspection, and the Express permit asks for the City's Form 401 and identification. You may not hire anyone other than a licensed plumbing contractor to do it, and the exemption does not cover a two-flat. ## Related service ### Whole-house repiping Whole-house repiping replaces every hot and cold supply line from the main shutoff to the fixtures in the material the local code lists, then pressure tests it before the walls close. ## More guides - Learn [Do you need a permit to repipe a house in Chicago?](https://chicagolakerepiping.com/guide/chicago-repiping-permit/)What the Department of Buildings' Express permit covers when repiping a Chicago building, what pushes a job into plan review, the documents a riser or condo job needs, and what the suburbs do differently. - Cost Guide [How much does it cost to repipe a house in Chicago?](https://chicagolakerepiping.com/guide/repiping-cost-chicago/)Typical ranges for a single-family house and a two-flat, what sits inside the price, the City's permit fees, and why two quotes for the same house can differ. - Learn [Galvanized pipes in Chicago homes: what to do about them](https://chicagolakerepiping.com/guide/galvanized-pipes-chicago-homes/)How to tell whether a Chicago bungalow, two-flat or greystone home still has galvanized steel supply pipe, what its symptoms do and do not prove, and how Chicago's code, permits and lead rules shape the fix. - Decision Guide [Should you repipe after your lead service line is replaced?](https://chicagolakerepiping.com/guide/repipe-after-lead-service-line-replacement/)A lead service line replacement brings a new copper service to the basement wall. Whether the pipe it now feeds should go too depends on what that pipe is, where the new line comes in, and how the two permits fit together. - Decision Guide [Is repiping worth it when you buy or sell an older Chicago home?](https://chicagolakerepiping.com/guide/is-repiping-worth-it/)How to turn a home inspection note about galvanized pipe into a decision: what the inspector could and couldn't see, what to measure before closing, the scope options and how buyers and sellers each weigh them.