How Long Does an Electrical Panel Upgrade Take?

One of the most common questions we receive about panel upgrades is "how long will I be without power?" It's an important question—you need to plan around the outage for work, meal preparation, and family needs. Here's a detailed breakdown of what to expect.

Quick Answer: The On-Site Window Is Project-Specific

Access, service condition, utility disconnect and reconnect availability, equipment, permit status, inspection requirements, and weather determine the field-work and outage windows. The written proposal identifies the expected sequence after those inputs are reviewed.

Timeline by Project Type

Panel Replacement (Same Amperage)

Planning basis: Confirm after panel condition, access, circuit count, permit stage, and any utility requirement are reviewed.

If you're simply replacing a problematic panel (like a Federal Pacific) with a modern panel at the same amperage, the work is straightforward:

• Set up the work area and document existing circuits
• De-energize under the approved service plan
• Remove and replace the listed equipment
• Reconnect, torque, label, test, clean up, and complete the walkthrough

100 Amp to 200 Amp Upgrade

Planning basis: Confirm after the service entrance, meter base, grounding, access, utility window, and permit stage are reviewed.

This is our most common upgrade. It includes service entrance changes:

• Setup and utility coordination
• Utility disconnects power
• Remove and replace the documented service equipment
• Install the approved service conductors, meter equipment, and 200-amp panel
• Reconnect, torque, label, and test the circuits
• Utility reconnects during its available window
• Complete final checks, cleanup, and walkthrough

200 Amp to 400 Amp Upgrade

Planning basis: Quoted per project after the load, utility design, transformer needs, equipment, route, and site conditions are reviewed.

Larger upgrades are more complex and may involve utility transformer work:

• Service entrance, meter equipment, and panel sequencing follows the approved design
• Circuit redistribution and testing depend on the selected equipment
• Utility design and available work windows control part of the schedule

Subpanel Installation

Planning basis: Feeder size and route, equipment, panel condition, access, and the permit path determine the on-site window.

A subpanel follows a different sequence because the main service remains in place:

• Planned de-energization to add the feeder breaker
• Run feeder cable to subpanel location
• Mount and wire subpanel
• Connect circuits to subpanel

Factors That Can Extend Timeline

Panel Location Issues

Difficult access adds time:

• Cramped spaces requiring careful maneuvering
• Exterior panels in challenging locations
• Panel relocation requests
• Panels behind obstacles that must be worked around

Existing Code Violations

If we discover issues during the upgrade, they must be addressed:

• Double-tapped breakers requiring additional circuits
• Improper grounding that needs correction
• Damaged wires that need replacement
• Unsafe installations from previous work

Utility Company Scheduling

For service upgrades, Dominion Energy must:

• Disconnect power at the meter
• Reconnect after our work is complete
• Coordinate the available disconnect and reconnect windows
• Utility changes or delays can alter the planned sequence

Weather Conditions

Since service entrance work is exterior:

• Rain may delay outdoor portions
• Extreme heat or cold affects work pace
• We'll reschedule in severe weather for safety

Additional Work Added

If you're adding circuits during the upgrade:

• Each new circuit adds route-, access-, and protection-specific work
• Long wire runs take longer
• Multiple additions can extend project significantly

The Full Project Timeline

Beyond the field-work window, the complete schedule includes:

Before Installation:

• Initial review: Site conditions, load, service, access, and goals
• Proposal: Prepared after the required inputs are documented
• Scheduling: Based on equipment, crew, access, utility, and permit status
• Permit: Controlled by the jurisdiction's current queue
• Utility coordination: Controlled by the serving utility and approved design

After Installation:

• Inspection scheduling: Controlled by the jurisdiction's current queue
• Inspection: The authority having jurisdiction makes the final determination
• Corrections: Scope and reinspection timing depend on any issued notice
• Documentation: Provided after the applicable records are available

Minimizing Disruption

Here are tips for managing around your upgrade:

Before the Day:

• Charge all devices overnight
• Plan meals that don't require cooking
• Notify anyone who works from home
• Make arrangements for medical equipment
• Clear the area around your panel

During the Work:

• Use a coffee shop or library for work-from-home needs
• Follow current food-safety guidance for any item affected by the documented outage
• Use the time to run errands
• Battery-powered devices provide entertainment

Special Circumstances:

• Medical equipment: Follow the device manufacturer's and care team's emergency plan; optional temporary power does not guarantee uninterrupted operation
• Sump pumps: Review weather and the manufacturer's backup recommendations before the outage
• Work meetings: Make an off-site or independent-connectivity plan because restoration timing is not guaranteed

Why We Don't Rush

While we work efficiently, we never sacrifice quality for speed. Proper panel installation requires:

• Careful documentation of existing circuits
• Proper torque on all connections
• Complete testing of every circuit
• Thorough safety verification
• Correct labeling for future reference

A rushed installation can lead to problems that cost more to fix than the time saved. Our experienced electricians work at a pace that ensures quality while minimizing your outage.

Schedule Your Panel Upgrade

Ready to upgrade your panel? Contact AJ Long Electric at (571) 444-6886 to schedule your consultation. We'll provide an accurate timeline estimate based on your specific situation and work with your schedule to minimize disruption.