2026 cost reference
These are the reviewed unit and project ranges used by the calculator. The model does not apply hidden state, ZIP, access or severity multipliers.
Use the range for comparison, not diagnosis
A browser tool cannot inspect structure, moisture pathways, contamination, code requirements or hidden conditions. Use the estimate to understand the rough scale of the cost and compare contractor quotes on a more consistent basis.
Frequently asked questions
Why are interior and exterior drainage priced differently?
Interior systems usually involve cutting and repouring basement slab; exterior footing drains require excavation outside the foundation. Current published interior-system pricing also commonly assumes connection to a sump, so RepairGauge does not automatically add another pump on top.
How much perimeter should I enter?
Use the approximate length included in the proposed drainage system, not automatically the entire basement unless the contractor is pricing a full-perimeter system.
Does RepairGauge include drywall and flooring restoration?
No. Finish restoration varies too much without measured quantities, so the calculator keeps it outside the drainage estimate rather than inventing an allowance.
Related cost guides
These figures may be quoted with attribution and a link back to this page. Review date: August 29, 2026.