electrical upgrade cost
1 Typically it costs $800-$1,200 to have a qualified electrician upgrade an existing panel to 100 amps, or $1,500-$2,500 if a new panel is needed. 2  Expect to pay $1,300-$3,000 to upgrade to 200 amps, or $2,000-$4,000 to go to 400 amps.3  Installing a new sub-panel runs $500-$1,000.lectrician: NW Vaughn Electric. average cost for a 100A complete service upgrade 1200 - 1500 200A complete service upgrade 1800-2000 complete upgrade includes new meter, new service drop, new 100A or 200A Panel, utility grounding bridge, 2 ground rods, all necessary breakers. labor and permit fees included.