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. Understanding distribution box cost is essential for businesses and property owners planning electrical installations or upgrades. What Usually Pushes Junction Box Cost Up? What Usually Pushes Junction Box Cost Up? Junction box cost can vary much more than. Buyers typically pay for a full panel replacement, including labor, materials, and permits. It is an engineered low voltage power distribution system.