What’s wrong with my basement?
Pick the symptom you’re seeing. We’ll tell you the likely cause, how urgent it is, the usual fix — and what that fix typically costs in the U.S.
Approximate national range — not a quote. Get exact numbers for your state with the cost estimator.
A first read — not a substitute for eyes on site.
Each symptom above maps to the cause that professionals most commonly find behind it, based on published guidance from independent cost and home-repair sources. Basements do surprise people, though: a musty smell can hide a slow leak, and a “harmless” crack can be the first sign of soil pressure. If we’ve flagged your symptom as urgent — especially anything structural — get a professional inspection before spending money on a fix.
Cost ranges & sources used by this tool
- Leak & seepage repair: $2,000–$7,000 — Angi (May 2026), This Old House (Mar 2026)
- Crack injection: $250–$800 per crack — HomeGuide (Jan 2026)
- Structural wall reinforcement: $4,000–$12,000 — HomeGuide (Jan 2026), Angi (May 2026)
- Sump pump install/replace: $600–$2,500 — HomeGuide (Jan 2026)
- Mold & moisture remediation: $500–$4,000 — HomeGuide (2026)
- Flood cleanup / water damage: $1,360–$6,290 — Angi (May 2026)
Last verified July 5, 2026 · See a wrong number? Tell us and we fix it.
Know the problem? Price the fix.
Run your repair through the free cost estimator for a range adjusted to your state — or get matched with a local pro for a real quote.