A panel upgrade or rewiring job isn't something you can knock out in an afternoon—but knowing what to expect timeline-wise helps you plan your budget and schedule. Most residential panel upgrades take 1–3 days, though the total project duration depends heavily on scope, permits, and your home's existing infrastructure. Understanding the phases and potential delays will save you frustration and unexpected costs down the road.
What Determines Panel Upgrade Timeline
The speed of your panel upgrade hinges on several factors that extend far beyond the electrician's skill level. Permit acquisition often adds 1–2 weeks depending on your local jurisdiction's backlog and inspection requirements. The complexity of your current wiring, age of your home, and whether you need trenching or new service runs all affect how long the actual work takes.
If you're upgrading from a 100-amp to a 200-amp service, that's more invasive than a panel swap at the same amperage. Similarly, homes built before the 1970s may have outdated wiring that requires more extensive rewiring alongside the panel replacement.
The Typical 3-Phase Timeline
Inspection and permitting (1–2 weeks) Before any tools come out, your electrician needs to assess your current setup and submit plans to local authorities. This phase includes a site visit, measurements, and paperwork filing. Some jurisdictions rubber-stamp permits in days; others take weeks.
Actual installation (1–3 days) The hands-on work usually happens faster than people expect. A straightforward panel replacement at the same amperage might take a single day. A full upgrade with new service lines, breaker replacements, and rewiring of multiple circuits typically spans 2–3 days depending on crew size and complexity.
Final inspection (1 week) After installation, the local electrical inspector must sign off before your utility company energizes the new service. Scheduling the inspection and waiting for availability can add another week.
Real-World Timeline Scenarios
Simple 100-amp panel swap (older home, same amperage upgrade): Permit + inspection: 10–14 days | Installation: 1 day | Final inspection: 5–7 days Total: 2.5–3 weeks
100-amp to 200-amp upgrade (new service line required): Permit + inspection: 10–14 days | Installation: 2–3 days | Final inspection: 5–7 days Total: 3–4 weeks
Full home rewiring + panel upgrade (1950s home, knob-and-tube rewiring): Permit + inspection: 14–21 days | Installation: 5–7 days | Final inspection: 7–10 days Total: 4–6 weeks
Factors That Slow Things Down
Several hidden delays can extend your timeline beyond estimates:
- Utility company delays: If your service line needs replacement, the utility may take 1–3 weeks to schedule work before your electrician can finish.
- Structural obstacles: Rewiring through finished walls, conduit runs, or underground trenches requires extra time and sometimes demolition.
- Permit revisions: If the inspector requests changes to the submitted plans, you're waiting another 1–2 weeks for reapproval.
- Material shortages: High-demand components like certain breaker types occasionally ship late.
- Weather delays: Underground work and exterior trenching get postponed in rain or frozen ground.
- Code compliance surprises: Older homes sometimes fail initial inspection due to discovered violations, requiring additional work.
Questions to Ask Before Scheduling
Before hiring a panel upgrade contractor, pin down these specifics:
- How long does the permit approval typically take in your area?
- Does the company handle permit filing, or do you?
- Will the utility need to shut off your service during installation?
- Are inspections included, or billed separately?
- What happens if the inspector finds problems requiring rework?
- Is a site assessment visit free or charged?
Cost vs. Speed Tradeoffs
Faster doesn't always mean better when upgrading panels. Rushing the electrical work invites safety issues and code violations. Licensed electricians in your area typically work at realistic speeds that align with code compliance. You might find Mercoly useful for comparing multiple vetted electricians' timelines and pricing side-by-side, ensuring you're not sacrificing quality for speed.
Adding crew members can shorten installation time by a day, but expect a modest cost premium. Most homeowners find 2–4 weeks total timeline acceptable and safe.
Frequently Asked Questions
Q: Can I live in my home during a panel upgrade? Yes, in most cases. Your electrician will coordinate with the utility to minimize power shutoff time, often just a few hours. Full rewiring jobs may require you to be elsewhere for a day or two.
Q: Do I need permits for a panel upgrade? Yes, virtually every jurisdiction requires permits and final inspection for panel work. Skipping permits voids warranties, blocks insurance claims, and creates safety liability.
Q: Why does a simple panel swap take so long if the work is only one day? Most time is spent on permits and inspection scheduling, not installation. These administrative phases are unavoidable and legally required.
Get estimates from multiple providers to compare their timelines and pricing side-by-side.