Written by Jimco Electric | Published on July 2025
Most Chicago homes built before 1980 run on a 100 amp panel, but the majority of modern households need at least 200 amps to handle today’s appliances, EVs, and home systems safely. This guide breaks down the real differences between 100 amp and 200 amp panels, what Chicago and surrounding area homeowners should expect to pay, and how to decide which upgrade is right for your home.
Understand What Amp Rating Actually Means for Your Home
The amp rating on your electrical panel tells you the maximum amount of electrical current your home can draw at one time. Think of it like a water pipe: a wider pipe carries more flow. A larger amp rating means more capacity for your lights, appliances, HVAC systems, and electronics to run simultaneously without tripping breakers.
A 100 amp service delivers roughly 24,000 watts of power. A 200 amp service doubles that to about 48,000 watts. That difference matters a lot when you add an EV charger, upgrade to a central air system, or finish a basement with new circuits.
Chicago homes face unique demands. Cold winters mean heavy furnace loads. Many neighborhoods have older wiring that was installed when homes had far fewer devices. Understanding your panel’s limits is the first step toward keeping your home safe and functional.
Compare 100 Amp vs 200 Amp Panels Side by Side
Here is a direct comparison of the two most common residential panel sizes so you can see exactly how they stack up against each other.
| Feature | 100 Amp Panel | 200 Amp Panel |
|---|---|---|
| Maximum Wattage | 24,000 watts | 48,000 watts |
| Number of Circuit Slots | Typically 20 to 30 | Typically 30 to 40+ |
| Supports EV Charger | Limited, often not recommended | Yes, with dedicated circuit |
| Supports Central AC | Possible in smaller homes | Yes, comfortably |
| Typical Home Size | Under 1,500 sq ft, older builds | 1,500 sq ft and above |
| Common in Chicago? | Yes, pre-1980 bungalows and two-flats | Yes, newer builds and renovated homes |
| Upgrade Cost Range | N/A (already installed) | $1,500 to $4,000 installed |
The upgrade cost range above reflects typical pricing in the Chicago metro area. Homes located in suburbs like Naperville, Oak Park, Joliet, or Evanston may see slightly different pricing depending on permit fees and local utility coordination requirements.
Identify the Signs Your Chicago Home Needs a 200 Amp Upgrade
Not every home needs to upgrade right away. But certain warning signs and lifestyle changes are clear signals that a 100 amp panel is no longer keeping up with demand. Here are the most common situations Jimco Electric sees in Chicago-area homes.
- Breakers trip frequently, especially when running multiple appliances at once
- Lights flicker or dim when large appliances turn on
- You are adding or already have central air conditioning
- You want to install an EV charger in your garage
- You are finishing a basement or adding a home office or workshop
- Your panel uses fuses instead of breakers (a sign of very outdated service)
- Your electrician or home inspector flagged the panel as undersized
- You are adding an electric water heater or induction range
Chicago bungalows, two-flats, and coach houses are especially common candidates for upgrades. These older building types were designed for far less electrical load than modern households require. If your home was built before 1970 and has never had a panel upgrade, it is worth scheduling an inspection.
Review What a Panel Upgrade Costs in Chicago and Surrounding Areas
Pricing for a 100 amp to 200 amp panel upgrade in the Chicago area depends on several factors including your current wiring condition, permit requirements, and whether ComEd needs to upgrade the meter base or service entrance. Here is a breakdown of what to expect.
| Cost Component | Estimated Range |
|---|---|
| Panel and breakers (200 amp) | $400 to $900 |
| Labor (licensed electrician) | $800 to $2,000 |
| Chicago or suburban permit fees | $75 to $300 |
| Meter base upgrade (if needed) | $200 to $600 |
| ComEd coordination and reconnection | Usually included by utility |
| Total Estimated Range | $1,500 to $4,000 |
Homes in Chicago proper may face stricter permit inspection timelines than suburbs like Plainfield, Downers Grove, or Aurora. Always hire a licensed electrician who knows the local code requirements for your specific municipality. Jimco Electric handles permit pulls and ComEd coordination so you do not have to manage that process yourself.
Know When a 100 Amp Panel Is Still Enough
A 100 amp panel is not automatically a problem. There are situations where it is perfectly adequate and an upgrade may not be necessary or cost-effective right now.
- Your home is under 1,200 square feet with no plans to expand
- You use gas for heating, cooking, and water heating
- You do not plan to add an EV charger or significant new circuits
- Your panel is relatively new, properly grounded, and has no signs of overloading
- You are renting out the property and tenants have modest electrical needs
In these cases, keeping your existing 100 amp service and focusing on other electrical improvements like GFCI outlets or updated wiring may make more financial sense. A licensed electrician can do a load calculation to tell you exactly how close to capacity your current panel is running.
Understand Chicago and Illinois Code Requirements for Panel Upgrades
In Chicago, any electrical panel upgrade requires a permit from the City of Chicago Department of Buildings. The work must be performed by a licensed electrical contractor, and an inspection is required before the new service is energized. Skipping permits creates liability problems if you sell the home or file an insurance claim.
Suburban municipalities within 40 miles of Chicago each have their own permit processes. Towns like Schaumburg, Elmhurst, Bolingbrook, and Cicero follow the Illinois Electrical Licensing Act but may add local requirements on top of it. Always verify permit requirements in your specific village or city before work begins.
ComEd, the primary utility for the Chicago area, must be notified before a service upgrade. They will disconnect power before the work starts and reconnect after the inspection passes. Jimco Electric coordinates directly with ComEd on these upgrades, which saves homeowners from back-and-forth scheduling headaches.
Illinois also requires that panel upgrades include proper grounding and bonding per the National Electrical Code. Older Chicago homes sometimes have knob-and-tube wiring, which may need to be addressed during or alongside a panel upgrade depending on its condition and location in the home.
FAQs on 100 Amp vs 200 Amp Electrical Panels
How do I know if my Chicago home has a 100 amp or 200 amp panel?
Look at the main breaker inside your electrical panel. It will be labeled with its amp rating, either 100A or 200A. If you are unsure or the label is worn, a licensed electrician from Jimco Electric can inspect it and give you a clear answer during a service call.
Is a 200 amp panel required if I install an EV charger?
A Level 2 EV charger requires a dedicated 240-volt, 40 to 50 amp circuit. While some 100 amp panels can technically support this, it leaves very little room for other loads. Most electricians and EV charger manufacturers recommend a 200 amp panel for safe and reliable charging at home.
How long does a panel upgrade take in Chicago?
The physical installation typically takes 4 to 8 hours for an experienced crew. However, the full process including permit approval and ComEd scheduling can take 1 to 3 weeks depending on the municipality and utility availability. Jimco Electric manages this timeline for you from start to finish.
Will upgrading to 200 amps lower my electric bill?
Not directly. A larger panel does not use more electricity on its own. It simply gives your home more capacity. In some cases, homes with overloaded 100 amp panels run less efficiently, so an upgrade combined with newer appliances can indirectly reduce energy waste over time.
Can I upgrade my panel without upgrading the whole service entrance?
Sometimes, yes. If your current service entrance wires and meter base are already rated for 200 amps, only the panel itself needs to be replaced. An electrician will inspect your full service to determine what components need upgrading. This evaluation is typically part of the estimate process.
Do older Chicago bungalows always need a 200 amp upgrade?
Not always, but many do. Chicago bungalows from the 1920s through 1960s were built with minimal electrical loads in mind. If yours still has a 60 or 100 amp fuse box and you use modern appliances, central air, or want to add circuits, an upgrade is strongly recommended for both safety and functionality.
Wrap Up and Next Steps
Choosing between a 100 amp and 200 amp panel comes down to your home’s size, age, current appliances, and plans for the future. Most Chicago-area homeowners with older homes or growing energy needs benefit significantly from upgrading to 200 amp service.
Jimco Electric serves homeowners throughout Chicago and the surrounding suburbs up to 40 miles out. Whether you need a quick inspection or a full panel upgrade, our licensed team handles permits, ComEd coordination, and the installation itself.
Call Jimco Electric today at 708-304-8687 to schedule your panel evaluation or request a free estimate. The sooner you know your panel’s capacity, the sooner you can plan with confidence.