Cost

Notes

• Where the number comes from. The national price for interior basement waterproofing is $75 per linear feet — interior drain tile pricing published for 2026, $50–$110 per linear foot. Labor is about 60% of that. Cement Masons and Concrete Finishers in Missouri average $64,140 a year against a U.S. mean of $60,050 — a factor of 1.068 — so the labor half is scaled by that and the material half is not.
• What is in the price: breaking out the slab at the perimeter, the drain tile and gravel, a wall vapour barrier, re-pouring the concrete, a sump pit and pump.
• What is not: a battery backup pump, exterior grading and downspout work, foundation crack injection, and finishing the basement afterwards. These are the lines that turn a $7,806 quote into a $9,758 invoice, so ask about each one before signing.
• Why state matters more than people expect. Materials ship at national prices; crews do not move. Missouri sits above the national mean by 6.8%, which lands on 60% of the job and moves the total by $306.
• Use this as a bid check, not a quote. It prices an average job in an average condition. Difficult access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a per-unit average.