Urban: Low-$1,000s to mid-$2,000s with higher labor and disposal costs. Three scenario cards illustrate typical projects with varied scope. Buyers typically pay a wide range for septic distribution box replacement, with cost driven by box material, accessibility, and local permitting. Even the most skilled DIY homeowners should hire a plumber to tackle the job, which can cost anywhere from $550 to $1,800. Labor makes up the largest portion of the cost to replace a septic distribution box, running as high as $1,200 for. Typical project ranges for a single distribution box install span from $500 to $3,000, with most residential jobs landing around $1,000 to $1,800. For example, plastic boxes are generally cheaper but may not last as long as concrete options.