Written by Jimco Electric | Published on June 2025
Most residential electrical panel upgrades in Chicago take between 4 and 8 hours to complete in a single day. For larger homes, older buildings with outdated wiring, or jobs that require utility coordination, the full process can stretch across two days. This article covers every factor that affects the timeline, what happens during each phase, and how Chicago-specific rules can impact your project.
Understand the Typical Panel Upgrade Timeline
A standard panel upgrade has several distinct phases. Each one takes time, and skipping or rushing any phase creates safety and code problems. Here is a realistic breakdown of what happens on the day of your upgrade.
- Utility shutoff coordination: ComEd needs to disconnect power at the meter before work begins. This can take 1 to 3 hours depending on scheduling and crew availability in your area.
- Old panel removal: The licensed electrician removes the existing breaker box, labels all circuits, and inspects the existing wiring. This usually takes 30 to 60 minutes.
- New panel installation: Installing the new panel, landing circuits, and connecting the main breaker typically takes 2 to 4 hours depending on the number of circuits.
- Inspection and reconnection: After the work is done, the inspector checks the installation before ComEd restores power. This adds another 1 to 2 hours.
Add those phases together and you get a realistic 4 to 8 hour window. Jimco Electric schedules these jobs early in the morning so most customers have power restored by late afternoon.
Compare Timelines by Panel Size and Home Type
Not every panel upgrade is the same. A 100-amp upgrade on a small bungalow is a different job than a 200-amp or 400-amp upgrade on a larger home. The table below shows realistic time ranges based on common scenarios in the Chicago area.
| Upgrade Type | Typical Home Size | Estimated Time | Notes |
|---|---|---|---|
| 100-amp to 200-amp upgrade | Small to mid-size home | 4 to 6 hours | Most common upgrade in Chicago bungalows |
| 200-amp panel replacement | Mid-size to large home | 5 to 7 hours | Same amperage, new hardware |
| 200-amp to 400-amp upgrade | Large home or multi-unit | 1 to 2 days | May require new service entrance |
| Sub-panel addition | Garage, addition, or workshop | 3 to 5 hours | Main panel stays; new sub-panel added |
| Older home rewire with upgrade | Pre-1960s Chicago home | 2 to 4 days | Knob-and-tube or aluminum wiring involved |
Chicago has a large stock of older homes, especially in neighborhoods like Beverly, Oak Park, and Evanston. If your home was built before 1960, budget extra time for the electrician to assess and address outdated wiring before the new panel goes in.
Know How Chicago Permits Affect the Timeline
In Chicago and most suburbs within 40 miles, you are required to pull a permit before upgrading an electrical panel. This is not optional, and skipping it creates serious problems when you sell your home or file an insurance claim.
The City of Chicago requires an electrical permit through the Department of Buildings. Most suburbs like Naperville, Joliet, Aurora, and Elgin have their own permit offices with their own processing times.
- Chicago city permits: Standard processing typically takes 5 to 10 business days online. Expedited review may be available for an additional fee.
- Suburban permits: Many suburbs in Cook, DuPage, and Will County process permits in 3 to 7 business days. Some smaller towns still require an in-person application.
- Inspection scheduling: After the work is done, an inspector must sign off. In Chicago, that appointment can take 3 to 7 days to schedule after work completion.
When you factor in permitting, the full project from first call to final inspection approval can take 2 to 3 weeks. The actual hands-on work is still just one day. Jimco Electric handles permit applications on your behalf so you do not have to navigate city portals or make multiple trips to a permit office.
Identify Factors That Can Slow Down Your Upgrade
Some jobs run into complications that add time. Knowing these in advance helps you plan and avoid surprises.
Chicago’s older housing stock is the most common source of delays. Homes with Federal Pacific or Zinsco panels, knob-and-tube wiring, or aluminum branch circuit wiring require extra attention before a new panel can be safely installed.
| Complication | How It Adds Time | Extra Time Estimate |
|---|---|---|
| ComEd scheduling delays | Utility may not arrive on the scheduled window | 1 to 4 hours |
| Knob-and-tube wiring present | Requires evaluation and partial rewire | Half day to full extra day |
| Service entrance replacement needed | Requires new weatherhead, mast, and meter base | 2 to 4 hours |
| Panel in difficult location | Crawlspace, tight utility closet, or high ceiling | 1 to 2 hours |
| Failed inspection | Corrections needed before reinspection | 1 to 5 business days |
One factor specific to the Chicago area is winter weather. ComEd lineworkers work outside at the meter and service entrance. During heavy snow or ice storms, utility crews may be delayed. If you are scheduling an upgrade between November and March, build in some flexibility.
Explore What Happens on Installation Day
Understanding the actual day-of process helps you prepare your home and family. Here is what to expect step by step.
- Morning arrival: The electrician arrives early, usually between 7 and 8 AM. They review the scope of work, confirm the permit is in hand, and call ComEd to confirm the shutoff window.
- Power shutoff: ComEd disconnects power at the meter. Your home will have no electricity during this phase. Plan accordingly with food, lighting, and any medical equipment needs.
- Panel swap: The old panel comes out, circuits are carefully labeled, and the new panel is mounted and wired. This is the longest hands-on portion of the day.
- Grounding and bonding: Chicago code requires proper grounding. The electrician verifies the grounding electrode system meets current NEC and local code requirements.
- Inspector visit: The inspector checks the work before ComEd restores power. If everything passes, ComEd reconnects the meter and power is restored.
- Final walkthrough: Your electrician labels every breaker clearly, tests circuits, and explains the new panel to you before leaving.
Jimco Electric communicates with customers throughout the day so you always know what phase the job is in and when to expect power back on.
Learn What to Do Before Your Upgrade Appointment
A little preparation on your end can save an hour or more on installation day and reduce the chance of complications.
- Clear a 3-foot work area around the electrical panel. Remove shelving, stored items, or furniture blocking access.
- Make a list of all the circuits in your home if you know them. Your electrician will label everything, but any notes you have help speed that process.
- Plan for a full day without power. Charge devices, stock ice if needed, and arrange any medical equipment with battery backup or alternate location.
- Let your neighbors know if the work involves the exterior service entrance, since ComEd crews sometimes work near shared utility lines.
- Confirm the permit has been pulled before the crew arrives. If Jimco Electric is handling this for you, verify the permit number is in hand at least one day before the job.
Homes in Chicago and the surrounding suburbs often have panels in tight basement utility rooms or in unfinished areas with low clearance. Clearing that space before the crew arrives makes a real difference in how quickly the job moves.
FAQs on Electrical Panel Upgrades in Chicago
Do I need to be home during the electrical panel upgrade?
Yes, someone over 18 should be present for the full duration of the job. The electrician may have questions about your circuits, and the inspector needs access to the panel area. You also need to be available when power is restored so any issues can be caught immediately.
Will my power be out all day during the upgrade?
In most cases, power is out for 4 to 7 hours during the active work phase. ComEd shuts off power at the start and restores it after the inspection is complete. Jimco Electric works efficiently to minimize downtime, and most customers have power back by mid to late afternoon.
Does ComEd charge a fee to disconnect and reconnect for a panel upgrade in Chicago?
ComEd does not typically charge a separate fee for the service disconnect and reconnect associated with a permitted panel upgrade. Your electrician coordinates the request. However, if additional utility work is needed at the meter or service entrance, fees may apply through ComEd directly.
Can a panel upgrade be done in Chicago during winter?
Yes, panel upgrades happen year-round in Chicago. The main risk in winter is ComEd crew delays due to storm response priorities. Scheduling on a clear weather day and giving yourself a flexible timeline reduces that risk. Interior work is not affected by cold weather.
How long does it take to get a permit for an electrical panel upgrade in Chicago?
In the City of Chicago, electrical permits are typically processed in 5 to 10 business days through the online portal. Suburban municipalities in Cook, DuPage, and Will County vary but most process in 3 to 7 business days. Jimco Electric submits permit applications as part of the project so you do not have to manage this yourself.
What is the difference between a panel upgrade and a panel replacement?
A panel replacement swaps your existing panel for a new one of the same amperage. An upgrade increases the amperage capacity, such as going from 100-amp to 200-amp service. Upgrades often also require new wiring at the service entrance and coordination with ComEd, which adds time compared to a straight replacement.
Wrap Up and Next Steps
For most Chicago-area homeowners, an electrical panel upgrade takes one full day, with the hands-on work running 4 to 8 hours. Permits, ComEd coordination, and older home conditions are the main factors that stretch the timeline beyond a single day.
If you are ready to schedule your upgrade or want a clear estimate of how long your specific job will take, call Jimco Electric at 708-304-8687. We serve Chicago and communities within 40 miles, and we handle permits, ComEd coordination, and inspections so the process is straightforward for you.