Electrical in Older Chicago Homes: What to Know

Chicago's housing is old: the median home in the city was built in 1954, compared with 1981 nationally (Census Reporter, ACS 2024). Chicago also has its own electrical code, and the city says only city-licensed electrical contractors may do electrical installations. Here's what that means for an older home.

This guide covers how old Chicago's housing really is, what older wiring you may find, how the Chicago Electrical Code and permits work, and how to plan for bigger jobs like a service upgrade. Every fact links to the city, Census or utility source it came from.

First, is it a safety problem?

Older wiring isn't automatically dangerous, but some signs can't wait.

• Sparks, smoke, flames or a burning smell from an outlet, switch or the panel: get everyone out and call 911 from outside. Don't go back in.
• An outlet or switch that smells hot, with no smoke: turn off that circuit's breaker (or the fuse) and leave it off until an electrician checks it.
• Water near outlets, cords or the panel, such as in a wet basement: stay clear and don't touch anything.
• Downed power lines after a storm: stay away from them and anything touching them, and call 911.

Never take the cover off your electrical panel or fuse box. Parts inside stay live.

How old are Chicago's homes?

Much older than the national average. According to the U.S. Census Bureau's American Community Survey (2024 1-year estimates), Chicago had 1,282,248 housing units (Census Reporter). Of those:

• Built in 1939 or earlier: 499,860 units, more than a third of the city's housing (Census Reporter).
• Built in the 1940s: 81,131 units.
• Built in the 1950s: 141,292 units.
• Built in the 1960s: 117,471 units.
• Built in the 1970s: 98,714 units.

The median year built in Chicago is 1954. For the U.S. as a whole, it's 1981 (Census Reporter).

That age matters for electrical work. A home built in the 1920s or 1950s was wired long before central air, big kitchens full of appliances or EV chargers. Many older homes have been updated since, some more than once. Others still have parts of their original systems. You often can't tell which from the outside.

What kind of wiring might an older Chicago home have?

It depends on when the home was built and what's been updated since. These are the older systems electricians most often find in homes of this age.

Knob-and-tube wiring

Knob-and-tube is one of the earliest home wiring methods. This Old House notes that it can't be grounded, that its connections may melt if too much current flows through them, and that circuits covered by building insulation should be rewired or disconnected because insulation can make them overheat (This Old House).

It can also affect insurance. A master electrician quoted by This Old House says some buyers can't get insurance on a home with knob-and-tube, and calls it a red flag that needs to be replaced and budgeted for. He also says outdated by today's standards doesn't automatically mean bad or unsafe (This Old House). If you're buying, ask your home inspector and insurer early.

Fuse boxes

Many older homes still have screw-in fuses instead of breakers. This Old House lists an outdated fuse box as a sign a home may need an electrical upgrade (This Old House). Never put in a larger fuse to stop one from blowing.

Two-prong outlets

Two-prong outlets have no ground. This Old House says they're grandfathered in older homes, while today's code requires grounded circuits (This Old House). An electrician can add a ground, install GFCI protection or rewire, depending on the circuit. See our outlet and GFCI repair cost guide for options.

Aluminum wiring in 1960s and 1970s homes

Chicago's older homes mostly predate aluminum wiring, but its 1960s and 1970s housing may have it. The U.S. Consumer Product Safety Commission says homes built before 1965 are unlikely to have aluminum branch wiring, while wiring installed between 1965 and the mid-1970s may contain it (CPSC). The same goes for additions and circuits rewired in those years. CPSC recommends a permanent repair by a qualified electrician.

Small electrical service

Older homes were built for smaller loads. A 2022 research report prepared for ComEd, the utility that serves Chicago, found that roughly two-thirds of ComEd's residential customers, about 2.2 million units, have 100-amp or smaller service (ComEd research). That can become a limit when you add central air, a heat pump, an electric range or an EV charger.

Does Chicago follow the National Electrical Code?

Chicago writes its own electrical code, built on the national one. The Chicago Electrical Code is part of the city's construction codes (City of Chicago). The city says the current electrical code was adopted in September 2017 and became mandatory on March 1, 2018 (City of Chicago).

When the city adopted it, the Department of Buildings said it made Chicago one of the first major cities to align with the 2017 National Electrical Code (City of Chicago). The same announcement said:

• About half of the National Electrical Code's articles were adopted with no local changes, and many others with only minor ones.
• The update expanded the use of flexible metal conduit in residential and other rehab work, to lower renovation costs.
• Chicago kept its strict requirements for metal conduit, along with long-standing rules on emergency lighting and generators.

Why that matters for you

National articles about new code rules may not match what applies in Chicago. Fixr notes that the National Electrical Code is a model code, and that states and cities choose which edition to adopt and can change it (Fixr). If you read about a 2026 national requirement, ask your electrician whether it applies under the Chicago Electrical Code.

Chicago's newest round of code changes, which became optional on October 1, 2026 and mandatory for permit applications started on or after December 1, 2026, covers new fuel gas, mechanical and energy codes plus building code amendments. The city's announcement doesn't list the electrical code among them (City of Chicago).

Chicago's metal conduit rules also affect cost and scheduling. Running wire in conduit is different work from running plastic-sheathed cable, so ask any electrician who mostly works in the suburbs whether they regularly work under the Chicago code.

Can you do your own electrical work in Chicago?

No. The city's Department of Buildings answers this directly: because of the risk of shock and fire, only electrical contractors licensed by the City of Chicago can perform electrical installations (City of Chicago).

It also means a handyman or a general contractor without the right city license shouldn't be doing your electrical work.

When do you need an electrical permit in Chicago?

For most electrical work. The city says a permit must be obtained for all installations or alterations of electrical equipment, and before the work starts (City of Chicago).

The exceptions are narrow. The city says a permit isn't required for things like (City of Chicago):

• Replacing a light bulb.
• Plugging cord-and-plug equipment into an existing outlet.
• Installing or removing some low-voltage devices, such as a doorbell, thermostat, speaker or security camera.
• In residential buildings up to four stories, installing or removing low-voltage or communication wiring.

The city adds that work done without a permit under these exceptions still has to meet the code. The exceptions may not apply to Chicago Landmarks or homes in landmark districts.

Who pulls the permit?

The electrical contractor does. The city says electrical-only permits are filed online by licensed electrical contractors and expediters, and that permit applications must list the licensed contractor doing the work (City of Chicago). If a company asks you to pull the permit yourself, or suggests skipping it, treat that as a warning sign.

Why older homes can need more work than expected

Two rules on the city's permit page matter for older homes. The city says an electrical contractor may not connect to existing wiring that is defective or unsafe, and that a contractor adding equipment is responsible for any overload of the service or circuits (City of Chicago).

In practice, a small job in an old house, like adding an outlet or a circuit, can turn up problems that have to be fixed first. Ask the electrician to look at the existing wiring and panel before quoting, and to tell you up front if anything would block the job.

How can you check an electrical contractor in Chicago?

The Department of Buildings' electrical inspections page links to a city lookup for licensed contractors (City of Chicago). Before you hire anyone:

• Ask for the company's name as it appears on its city license, and look it up.
• Ask whether they'll pull the permit and schedule the inspection.
• Ask whether they work under the Chicago Electrical Code regularly.
• Ask about insurance, and get the quote in writing.

What if you rent?

The city says tenants with electrical violations a landlord won't repair can report them through 311, giving as much detail as possible so an inspector can arrange a visit (City of Chicago). For anything involving smoke, sparks or burning, call 911 first.

What about service upgrades with ComEd?

If your home needs more power, the job may involve both a new panel and new service from ComEd. Plan for the utility's part of the schedule.

The same 2022 ComEd report says electricians reported a wait of around four weeks for a ComEd disconnect and reconnect on overhead service, and slightly longer for underground service (ComEd research). It also notes that ComEd's response is often faster than stated on its website. Treat those as reported experiences, not a promise, and ask your electrician what they're seeing now.

That report found most homes with 100-amp service can add some new electric loads without major upgrades, but that a fully electric home will almost certainly need 200-amp service. It listed typical costs in ComEd's territory of $4,000 to $6,000 for an amperage service upgrade, about $1,000 for a replacement panel or subpanel without a service upgrade, and about $400 for a new dedicated circuit (ComEd research). Those are 2022 estimates and ComEd notes the report is for general awareness only, so use them as background, not a quote.

Our electrical panel upgrade cost guide explains the difference between a panel upgrade and a service upgrade, and options that can sometimes avoid one.

What does electrical work cost in Chicago?

We haven't found public, sourced price data specific to Chicago, so here are national ranges, labeled as national. Local prices can differ, and Chicago's conduit rules and older housing can add labor.

• Electrician service call (national): $176 to $327 (Fixr).
• Hourly rates (national): $40 to $120 per hour (This Old House).
• Panel upgrade (national): $1,500 to $4,500 (Fixr).
• Replacing a fuse box with a breaker panel (national): $1,500 to $4,500 (Fixr).
• Rewiring an existing home (national): $6 to $10 per square foot (This Old House).
• Whole-home electrical inspection (national): $200 to $500 (This Old House).

For more detail, see how much an electrician costs.

What should you ask a Chicago electrician?

• Do you hold a City of Chicago electrical contractor license, and under what name?
• Will you pull the permit and schedule the city inspection?
• Do you regularly work under the Chicago Electrical Code, including its conduit rules?
• What did you find in the existing wiring and panel, and does anything need fixing first?
• Is there knob-and-tube, aluminum wiring or a fuse box that affects this job?
• Will this job need a service upgrade or anything from ComEd, and how long does that take right now?
• Does the quote include the permit, conduit, wall repair and any utility work?
• Can I get the price in writing, and is the work guaranteed?

The bottom line

Chicago's homes are older than most, and the city has its own electrical code and strict rules about who can do the work. That means more permits, more conduit and sometimes more surprises behind old walls. Start with safety, hire a contractor who holds the city license and pulls the permit, and get a clear written scope before work begins.

If you're not sure what's going on with your electrical, you can check my electrical to see likely causes, typical costs and what to ask.