For a basic plastic D-box, expect $25-$60 per unit, with installed costs typically $150-$400 depending on site access and labor rates. The main cost drivers are the number of boxes, trenching, backfill, and permit requirements. Cost estimates below use. In the United States, buyers typically pay for a distribution box (D-box) as part of septic system upgrades or repairs. Assumptions: region, specs, labor hours. The following table parses major cost buckets. Septic distribution box replacement costs between $500 and $1,500, with your box material and outlet size determining your final total.
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