New panel box pricing typically ranges from about $150 to $1,900 for parts and labor, with most residential projects landing between $450 and $1,500 depending on amp rating, gauge of wiring, and labor complexity. The exact cost of an electrical panel installation or replacement can vary widely based on the project scope. If. The cost of a new panel box depends on the box size, meter/branch requirements, enclosure type, and labor for installation. A 100-amp main breaker panel, which is often sufficient for smaller homes with minimal electrical demand, typically costs between $100 and $200 for the hardware. The cost of an electrical main panel upgrade in the Bay Area typically ranges from $5,500 to $7,500, depending on the size of the panel, the complexity of the installation, and other site-specific factors.