Installation price of external electrical distribution box for buildings

Junction box costs range from low‑price indoor models ($10‑$60) to weatherproof units ($70‑$450), with installation averaging $100‑$300 depending on location and materials. The distribution box cost encompasses not only the initial purchase. Breaker box installation cost typically spans a low end around $1,400 for a simple 100-amp panel with minimal wiring and no upgrades, to well over $9,000 for a full service upgrade in a larger home. Costs vary based on amp rating, construction materials, socket type, overhead vs. underground service, labour. If you're planning a new commercial building or upgrading an existing space, our commercial electrical installation calculator can help you estimate what your project might cost.