Knowing the panel upgrade process before it starts eliminates surprises. A typical residential panel upgrade takes 4–8 hours, but the full project spans several days when you include permits and inspections. Here is the step‑by‑step timeline.
Step 1: Estimate and Contract. Your electrician assesses your current panel, performs a load calculation, and provides a written estimate. Once you approve, they schedule the work and pull the required permits.
Step 2: Utility Coordination. The utility company must disconnect power at the meter before the panel can be swapped. Your electrician schedules this disconnect. In some cases, the utility does the disconnect remotely; in others, a crew visits.
Step 3: The Installation Day. Expect a power outage during the upgrade—typically 4–8 hours. The electrician removes the old panel, installs the new panel and breakers, runs new service entrance cable if needed, and reconnects circuits. If you’re upgrading from 100 to 200 amps, a new meter socket and larger service mast may also be installed.
Step 4: Utility Reconnect and Initial Testing. Once the panel is installed, the utility reconnects power. The electrician tests every circuit, checks for proper grounding, and labels the new panel.
Step 5: Inspection. A city or county inspector verifies the work meets code. This is a critical step—never skip it. A failed inspection means additional work and delay, but a passed inspection gives you peace of mind and a documented permit for future resale.
For help deciding which panel size to install, see our panel size guide. If your upgrade is for an EV charger or heat pump, see panel upgrades for EV, solar, and heat pumps. For preparing your home for installation day, see how to prepare for a panel upgrade. And for the bigger picture of whether you need one, start with when you need a panel upgrade.