Electrical Panel Upgrade Cost: 100A to 200A and Beyond

An electrical panel upgrade is one of the most important home improvements you can make, yet it often goes unaddressed until a problem forces the issue. With increasing electrical demands from EV chargers, heat pumps, and smart home systems, upgrading from a 100-amp to a 200-amp service has become a common need. Here’s what it costs and what’s involved.

Signs You Need a Panel Upgrade

Breakers that trip frequently, lights that dim when appliances run, a panel full of tandem (double-pole) breakers crammed in, a fuse box that hasn’t been updated in decades, or plans to add a hot tub, EV charger, or major appliance are all signs that an upgrade is warranted. Older Federal Pacific Electric Stab-Lok panels and Zinsco panels are safety hazards that should be replaced regardless of capacity.

Cost to Upgrade from 100A to 200A

A standard 100-amp to 200-amp service upgrade typically costs $1,500-$4,000, with most homeowners paying around $2,500. This includes the new panel, installation labor, permits, and the utility company’s meter base upgrade. Geographic location significantly affects pricing — urban areas and high cost-of-living regions trend toward the upper end.

What Determines Cost

• Service entrance cable — If the utility feed cable needs replacement or lengthening, add $500-$2,000
• Meter base upgrade — Often coordinated with the utility; may require their involvement
• New panel location — Moving the panel to a different location adds $500-$1,500
• Circuit reconnection — All existing circuits must be reconnected to the new panel
• Code compliance updates — Old wiring may require AFCI/GFCI upgrades to pass inspection

Upgrading to 400A Service

Homes with significant loads — multiple EV chargers, a swimming pool, electric heating for a large home, or home battery systems — may benefit from 400-amp service. This typically requires a meter socket upgrade and larger service entrance conductors. Cost for 400A service runs $3,000-$8,000 due to larger wire gauge requirements and utility coordination.

The Permit Process

Electrical service upgrades require permits in every jurisdiction. Your electrician should pull the permit, and the work must pass inspection before the utility will reconnect power. Typically the utility disconnects power before work begins, the electrician works while power is off (usually 4-8 hours), and the utility reconnects after a successful inspection.

Calculate your electrical load. Use the Service Size Calculator on electricalcalcpro.com to determine whether your home’s electrical load requires a 100A, 200A, or 400A service upgrade.