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Resolve the property
Match the address to its parcel, zoning context, and responsible permit authority.
What we check
What a plumbing permit application usually needs
Scope and Fixture Count
Reviewers need to know which fixtures are being added, moved, replaced, or removed. Bathrooms, laundry rooms, kitchens, wet bars, utility sinks, hose bibbs, sump pumps, ejector pumps, and basement finishes can each change the permit path.
Water Supply and Fixture Changes
Moving a sink, shower, toilet, tub, laundry box, or hose bib often requires review because supply sizing, shutoffs, backflow protection, and fixture clearances may apply. Some AHJs ask for a fixture schedule or simple plumbing plan.
Drain Line and Vent Work
New or relocated drain line work usually needs a permit before walls, floors, or ceilings close. Reviewers may check pipe sizing, slope, venting, cleanouts, trap locations, and whether the work ties into existing stacks correctly.
Water Heater Permit Triggers
A water heater permit may be required for replacement or new installation, especially when fuel type, venting, combustion air, electrical connection, expansion tanks, pans, drains, seismic bracing, or TPR discharge rules are involved.
Sewer, Water Service, and Exterior Work
Sewer lateral repair, water service replacement, well or septic coordination, right-of-way excavation, exterior cleanouts, and stormwater connections can trigger extra approvals beyond the basic plumbing permit.
Rough-In Inspection and Final Signoff
Many plumbing projects need a rough-in inspection before walls or floors close and a final inspection after fixtures are set. Some AHJs require a licensed plumber, contractor registration, pressure tests, or separate sewer and water inspections.
Process
Why Plumbing Permits Get Missed
Plumbing work often looks like a small fixture job from the outside, but the reviewer is thinking about leaks, sanitation, cross-connection risk, venting, gas or combustion safety, sewer impact, and whether hidden work can still be inspected. The safest move is to confirm the permit path before walls, floors, cabinets, or tile cover the work.
Per state
State-specific notes
IL
Illinois
Illinois plumbing requirements are heavily local and can include registered or licensed plumbers, municipal contractor registration, fixture-count rules, sewer inspections, and local amendments.
Explore Illinois permit rules
WI
Wisconsin
Wisconsin plumbing projects can involve state code expectations plus local permits and inspections. Homeowner eligibility, water heater rules, and UDC-adjacent remodel steps should be checked with the AHJ.
Explore Wisconsin permit rules
IN
Indiana
Indiana plumbing permit rules vary by city, county, and local code adoption. Many AHJs require permits for bathroom additions, drain changes, water heaters, sewer work, and remodel plumbing.
Explore Indiana permit rulesWatch for these
Common plumbing permit mistakes
- Assuming a fixture swap is always exempt when piping or location changes
- Covering drain line or vent work before rough-in inspection
- Replacing a water heater without checking venting, pan, TPR, or expansion requirements
- Missing licensed-plumber or contractor-registration rules
- Forgetting that sewer or water service work can trigger right-of-way or utility approvals
Next permit paths
Related permit guides
Water heater permit guideReplacement, venting, TPR discharge, pan, expansion tank, licensed-work rules, and final inspection.Open guideBuilding permit requirementsStart with the broad permit path: AHJ, zoning, site plan, contractor rules, fees, and inspections.Open guideElectrical permit guideCheck when water heaters, pumps, remodels, outlets, panels, or new circuits create electrical review.Open guideRemodeling permit guideFor bathrooms, kitchens, basements, and additions where plumbing is part of a larger permit package.Open guideManaged permit helpUse Permitech when plumbing work needs address-specific research, licensed-work checks, or filing guidance.Open guide
Done for you · from $199
Check the Plumbing Permit Path Before Work Gets Covered
Our permit experts research the AHJ requirements for your address, including fixture and drain-line triggers, water heater rules, licensed-plumber requirements, rough-in and final inspections, and any sewer, water, or right-of-way steps.
Our DIY Permit Package currently covers sheds and garages. For plumbing permits, our Done-For-You team handles the research and filing guidance.
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For contractors
Plumbing Contractors: Turn Local Rules Into a Repeatable Path
Plumbing permitting changes by AHJ, fixture scope, licensed-work rules, sewer or water service impacts, and inspection sequence. Use Permitech to standardize the local permit path before crews open walls or schedule rough-in.
Our self-serve subscription plans currently cover sheds and garages. For plumbing permits and other project types, we work with contractors on a custom contract basis tailored to your volume and service area. Fill out the quote form above and select "Contractor", and we’ll put together a plan that fits your operation.
Request a custom contractor quote500+ permits per year, in person
Built by a former permit tech who processed 500+ building permits per year across IL, WI, and IN. We don't just check if you need a building permit, we check zoning too.