Chicago Plumbing — IL State Plumbing License, Cast-Iron, Backflow
Chicago plumbing reality. Illinois State Plumbing License required (state-issued through IDPH, not city), cast-iron stack replacement in pre-1930 buildings, backflow preventer on sewer lateral in flood-prone wards, copper vs PEX. $5K-$45K typical scope.
Illinois State Plumbing License (administered by IDPH, Illinois Department of Public Health) is required for all plumbing work — a state-level license, not a city registration. Chicago's pre-1930 housing stock is built on cast-iron stacks with 90+ years of wear. Backflow preventers on sewer laterals are critical in flood-prone West Side and South Side wards.
Frequently asked questions
Do Chicago plumbers need a state license? Yes — Illinois State Plumbing License through IDPH is mandatory. Verify at dph.illinois.gov.
How much does cast-iron stack replacement cost? Single-stack replacement in a 3-flat: $12K-$28K. Full cast-iron replacement in a pre-war building: $35K-$85K.
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Each neighborhood has distinct regulatory posture. Baily pre-scopes against the specific overlay your home sits under.
- Lincoln ParkChicago Department of Buildings
- Old TownChicago Department of Buildings
- Gold CoastChicago Department of Buildings
- StreetervilleChicago Department of Buildings
- River NorthChicago Department of Buildings
- LakeviewChicago Department of Buildings
- WrigleyvilleChicago Department of Buildings
- North CenterChicago Department of Buildings
- Roscoe VillageChicago Department of Buildings
- UptownChicago Department of Buildings
- AndersonvilleChicago Department of Buildings
- EdgewaterChicago Department of Buildings
- Rogers ParkChicago Department of Buildings
- RavenswoodChicago Department of Buildings
- Lincoln SquareChicago Department of Buildings
- Albany ParkChicago Department of Buildings
- Irving ParkChicago Department of Buildings
- AvondaleChicago Department of Buildings
- Logan SquareChicago Department of Buildings
- BucktownChicago Department of Buildings
- Wicker ParkChicago Department of Buildings
- Ukrainian VillageChicago Department of Buildings
- Humboldt ParkChicago Department of Buildings
- Portage ParkChicago Department of Buildings
- Jefferson ParkChicago Department of Buildings
- Norwood ParkChicago Department of Buildings
- Edison ParkChicago Department of Buildings
- DunningChicago Department of Buildings
- Belmont CraginChicago Department of Buildings
- The LoopChicago Department of Buildings
- West LoopChicago Department of Buildings
- Fulton MarketChicago Department of Buildings
- South LoopChicago Department of Buildings
- Near North SideChicago Department of Buildings
- Little ItalyChicago Department of Buildings
- University VillageChicago Department of Buildings
- PilsenChicago Department of Buildings
- Little VillageChicago Department of Buildings
- East Garfield ParkChicago Department of Buildings
- West Garfield ParkChicago Department of Buildings
- AustinChicago Department of Buildings
- LawndaleChicago Department of Buildings
- ChinatownChicago Department of Buildings
- BridgeportChicago Department of Buildings
- Back of the YardsChicago Department of Buildings
- McKinley ParkChicago Department of Buildings
- Brighton ParkChicago Department of Buildings
- EnglewoodChicago Department of Buildings
- Hyde ParkChicago Department of Buildings
- KenwoodChicago Department of Buildings
- BronzevilleChicago Department of Buildings
- South ShoreChicago Department of Buildings
- ChathamChicago Department of Buildings
- PullmanChicago Department of Buildings
- BeverlyChicago Department of Buildings
- Morgan ParkChicago Department of Buildings
- Mount GreenwoodChicago Department of Buildings
- HegewischChicago Department of Buildings
- South ChicagoChicago Department of Buildings
- East SideChicago Department of Buildings
- Oak ParkChicago Department of Buildings
- EvanstonChicago Department of Buildings
Talk to Baily about your Chicago project
Start a scoping conversation. Baily verifies every matched contractor against the specific licensing, insurance, and permit requirements that apply in Chicago before you get a quote.
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