The total project usually falls between $1,000 and $4,500, with most homeowners landing in the $1,500–$3,000 zone when conditions are average. Assumptions: region, specs, labor hours. Buyers typically pay a wide range for septic distribution box replacement, with cost driven by box material, accessibility, and local permitting. Key cost drivers include panel amperage, indoor vs outdoor location, wiring length, and whether a full panel upgrade or rerouting is needed. Labor makes up the largest portion of the cost to replace a septic distribution box, running as high as $1,200 for some projects. Expect to pay anywhere from $50 to $150 per hour for labor. A distribution box, also known as an electrical distribution board or panel, serves as the central hub for managing and distributing electrical power throughout a.