Remodeling a pre-war Chicago home often means updating the systems hidden behind its walls. Opening walls and floors can expose wiring with no ground wire, aging galvanized supply pipes and cast-iron drains, and, outside the house, a water service line that may be lead. The best time to replace them is while the walls are open: under permit, by City-licensed trades, in an order planned with the design.
That is why systems work sits at the center of residential remodeling in Chicago when a house is 80 or more years old. This guide covers what you are likely to find, what the City requires as of 2026, and how a design-build team sequences the work. Rules change, so confirm your project with the City or your contractor.
Why a Remodel Is the Moment to Update Old Systems
A kitchen or bath remodel opens the same walls and floors the wiring and pipes run through. Replacing them then means opening those walls once, not twice.
City rules point the same way. Under the City’s Express Permit Program terms for work on existing buildings, the scope of work must remedy all readily apparent violations of the Chicago Minimum Requirements for Existing Buildings, whether or not an inspector has cited them. The City’s terms for electrical-only permits add that an electrical contractor may not connect to existing wiring that is defective or unsafe, and is responsible for any overload when adding new equipment. A new kitchen cannot simply be tied into old wiring that is defective or unsafe.
Old Wiring: Knob-and-Tube and Ungrounded Circuits
Knob-and-Tube Wiring
Knob-and-tube is a wiring system found in older homes, often identifiable by its rubber or asphalt-saturated cloth coating, according to the Center for Energy and Environment, a Minneapolis nonprofit. The group says it was phased out in the 1940s, was designed for light loads, is easily overloaded by multiple appliances, and that heat from the wires makes the rubber coating brittle.
Insulation is the other concern. The U.S. Department of Energy has explained that this wiring was meant to be cooled by free air in the wall cavity or attic, and that laboratory tests showed insulation around it can make it overheat, creating a fire hazard. DOE’s current weatherization guidance tells installers to check for live knob-and-tube wiring before insulating an attic floor, and to dam it off or replace it. If your remodel adds insulation, the old wiring comes first.
Ungrounded Circuits
Knob-and-tube wiring does not contain a ground wire, the conductor behind the third prong on a modern outlet. Without it, the Center for Energy and Environment notes, there is no protection when a fault occurs.
The City’s Express Permit Program terms for electrical work say deficiencies in the existing electrical system, including the means of grounding and bonding, must be corrected as part of any electrical work under the permit, and the electrical contractor must investigate existing conditions before applying.
Who Can Do the Electrical Work
A licensed electrical contractor is required for all electrical work that needs a building permit in Chicago. The City’s license rule applies whether or not a permit is required, with work done under a licensed supervising electrician. Its only listed exceptions are public utilities and State-licensed alarm contractors, so there is no homeowner exception.
Galvanized Supply Pipes and Cast-Iron Drains
Oatey, a plumbing products maker, notes that cast-iron drain pipes were common in homes built before the 1960s. Galvanized steel water pipe can be just as old: a Rhode Island plumber writing in Fine Homebuilding (December 2019/January 2020) put the average age of galvanized water pipes at 85 to 100 years.
How Old Pipes Fail
Oatey explains that minerals in the water slowly corrode cast-iron drains, leaving the interior rough and jagged and leading to clogs. Rust spots are not always an immediate concern, it adds, but a crack along a seam means replacement. Galvanized pipes, in Oatey’s words, will eventually corrode and leak along the threads. The Fine Homebuilding plumber has seen them rusted down to a passage the size of a BB or less, and told the reader who asked that total replacement was the only solution.
Lead Inside the House
The EPA says lead particles can attach to the surface of galvanized pipes and, over time, enter drinking water, and that solder made or installed before 1986 contained high lead levels. Lead-Safe Chicago, the City’s lead program site, adds old faucets and, sometimes, interior lead piping.
Look Before You Open
Oatey suggests reading the exposed drain, waste and vent lines in the basement to identify materials. For a line under a slab, This Old House plumbing and heating expert Richard Trethewey recommends a video camera inspection before tearing into any concrete, to find cracks, root intrusion or misalignment and to decide between full replacement and a less invasive repair such as lining.
Permits and Licensed Plumbers
According to the City, stopping a leak needs no permit, but removing and replacing a water, drain, soil, waste or vent pipe with new material does. A licensed and bonded plumbing contractor is required for most plumbing work. The owner or occupant of a detached single-family home may do their own plumbing, subject to code and inspection, but may not hire anyone other than a licensed plumbing contractor.
The Express Permit Program’s plumbing option covers repairing or replacing existing piping and risers, but not altering, reconfiguring or extending a system. Our guide to Chicago remodeling permits walks through each path, and bathrooms are often where old pipes show up first, as covered in what to know before renovating an old Chicago bathroom.
Lead Service Lines and the City Programs
The service line carries water from the main in the street into your house. According to the City’s Service Line Inventory, a house, two-flat or small building built before 1986 is highly likely to have a lead service line, and the City counts approximately 400,000 of them. Lead-Safe Chicago adds the exception: unless the line was replaced during a renovation or addition. The inventory is built partly from estimates, so treat it as a starting point and confirm the material on site.
Lead-Safe Chicago also notes that, beginning in January 2023, state law bans partial replacement: a lead line must be replaced completely, on both the private and public sides. That means a new copper line from the main into the house, with a water meter added if there is not one.
The City Programs, as of November 2026
- Equity Lead Service Line Replacement: a free full replacement and free water meter for homeowners who live in a home they own, with household income below 80% of the area median income. Priority goes to households with children 18 and under or elevated lead in free City testing, and funding limits the program size.
- Homeowner-Initiated Program: you hire a licensed plumbing contractor; the City waives the permit fees, connects the new line to the main and provides a free meter if needed. Commercial and mixed-use properties are not eligible.
- Breaks and Leaks: since January 1, 2023, a free full replacement when a lead line leaks or breaks. Reporting it to 311 is mandatory.
- Block-Long Replacement: lead lines affected by scheduled City water and sewer main work may be replaced, which Lead-Safe Chicago says is free.
Replacing the Line During a Remodel
The Department of Buildings’ water service permit page says the owner-initiated fee waiver applies to a standalone replacement or one done with the rehabilitation of an existing building (an alteration or addition). It covers a same-size replacement; if your new kitchen and baths call for a larger service, the owner pays the difference. Lead-Safe Chicago describes the waiver as standalone only, so confirm with the City before you plan around it.
Water service permits go to licensed plumbing contractors, and the Department of Water Management inspects all water service work. Under the City’s permit terms, non-emergency digging deeper than 6 inches needs an 811 Chicago dig ticket at least 2 business days and no more than 14 calendar days ahead, and working in the parkway or sidewalk needs a separate Chicago Department of Transportation permit. Afterward, Lead-Safe Chicago recommends flushing your water, using an NSF-53 certified filter for the first 3 months, and requesting a free follow-up lead test through 311.
Lead Paint and the EPA Renovation Rule
In 1978 the federal government banned the sale of lead-based paint for use in homes, and the EPA says approximately three-quarters of U.S. homes built before then still contain some. Under the EPA’s Renovation, Repair and Painting Rule, anyone paid to disturb painted surfaces in a home built before 1978 must be certified, and their employees trained in lead-safe work practices. The rule generally does not cover homeowners working on their own homes, but the EPA recommends hiring a lead-safe certified contractor.
Lead-Safe Chicago calls lead paint and its dust by far the leading cause of lead poisoning in Chicago, and advises owners of pre-1978 homes to assume the paint contains lead unless tests show otherwise. The City’s permit terms require lead-safe work practices under city, state and federal law, and you may need to file a Lead-based Paint Renovation, Repair, and Painting Form with the Chicago Department of Public Health before work begins. Asbestos work may also require a notification to that department.
How a Design-Build Team Sequences the Work
With design-build, design and construction sit under one roof, so the people drawing the kitchen and the people running the new circuits work from the same information. At Areté, each project is run by a Project Manager, and our in-house interior design team carries the design through to the finishes. A typical sequence looks like this.
1. Investigate Before You Design
Identify the wiring, read the basement drain lines, camera the main drain, look up the service line and request a free water test. Surprises should surface on paper, not mid-demolition.
2. Design the Systems With the Rooms
A new kitchen adds electrical load, a relocated bath has to reach a drain stack, and more fixtures may call for a larger water service.
3. Permit It and Open Up Safely
The City requires each business whose employees do electrical or plumbing work on the job to hold a City license and be listed on the permit. Once permitted, protect the rooms you are keeping and open walls using lead-safe work practices.
4. Rough In While the Walls Are Open
New wiring, supply lines, drains and vents go in together. The general contractor schedules City inspections as the work progresses, so the Department of Buildings can verify it matches the permit drawings and the code. The Project Manager keeps the trades in order.
5. Connect the Service Line, Then Finish
If the lead line is being replaced, the dig ticket, parkway permit and the City’s connection at the main are scheduled around the interior work. Only then do insulation, drywall, tile and cabinetry go in.
For a greystone, our guide to renovating a Chicago greystone covers what to keep alongside the new systems. For a whole-house project, see single-family home remodeling in Chicago. And if you are planning residential remodeling in Chicago in an older home, start with the systems assessment: it shapes every decision after it.
Frequently Asked Questions
Do I Have to Replace Knob-and-Tube Wiring During a Remodel?
Under the City’s express electrical permit terms, existing deficiencies, including grounding and bonding, are corrected as part of the permitted work, and an electrician may not connect to defective or unsafe wiring. How much must go in your house is a question for your licensed electrical contractor and the City.
How Do I Know if My Chicago Home Has a Lead Service Line?
Start with the City’s Service Line Inventory. If your house or two-flat was built before 1986 and the line was never replaced, the City says it is likely lead. Confirm the material on site.
Can I Replace My Lead Service Line as Part of a Remodel?
Yes, and it must be a full replacement. The Department of Buildings says its fee waiver can apply when the work comes with the rehabilitation of an existing building, but Lead-Safe Chicago lists it as standalone only, so confirm with the City.
Can I Do the Electrical or Plumbing Work Myself?
Not the electrical: Chicago requires a licensed electrical contractor. The owner or occupant of a detached single-family home may do their own plumbing, subject to code and inspection, but may not hire an unlicensed person to do it.
Does the Lead Paint Rule Apply to My Remodel?
If your home was built before 1978 and you pay someone to disturb painted surfaces, the EPA requires that firm to be lead-safe certified.
If your older Chicago home is due for a remodel, we would be glad to walk it with you and plan the systems alongside the design. Contact us to schedule a consultation.
