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Water DamageFlooded Basement Repair Cost Calculator
A fully flooded basement means water extraction, drying, sanitizing, and often rebuilding. Enter the flooded area and rate for a realistic estimate.
Repairing a flooded basement typically costs $3,000–$10,000+, often around $10–$15 per square foot once extraction, drying, sanitizing, and rebuild are combined. Sewage or deep, prolonged flooding can exceed $20,000.
How this calculator works
We combine a per-square-foot rate for drying and rebuild with a flat amount for the pumping, extraction, and equipment a full flood requires. The wide high-end reflects sewage contamination and prolonged saturation, which can more than double a clean-water job.
What changes the number
- Water depth and how long it sat drive mold risk and material loss.
- Sewage or storm water (Category 3) requires sanitizing and raises the rate sharply.
- Rebuild of drywall, flooring, and built-ins is often the largest line.
- Preventing the next flood (sump pump, backflow valve, grading) is an added but worthwhile cost.
Flooded basement repair cost by flooded area
At the calculator’s default $12/sq ft plus $800 for extraction and equipment. Depth matters as much as area: an inch of water across a finished basement can still mean removing every base cabinet, the bottom two feet of drywall and all the flooring, which is why the high multiplier on this calculator is the widest on the site. Remember that outside flooding is not covered by a standard homeowners policy.
| Affected area | Typical range | Midpoint estimate | All-in per sq ft |
|---|---|---|---|
| 200 sq ft | $2,560–$4,800 | $3,200 | $16.00 |
| 500 sq ft | $5,440–$10,200 | $6,800 | $13.60 |
| 1,000 sq ft | $10,240–$19,200 | $12,800 | $12.80 |
| 1,500 sq ft | $15,040–$28,200 | $18,800 | $12.53 |
| 2,000 sq ft | $19,840–$37,200 | $24,800 | $12.40 |
Frequently asked questions
Does homeowners insurance cover a flooded basement?
Internal failures (burst pipe, failed water heater) are often covered; external flooding from rain, rivers, or groundwater generally needs a separate flood policy.
What should I do first with a flooded basement?
Cut power to the area if safe, stop the water source, and start extraction fast — every hour of standing water raises the repair and mold risk.
How much does it cost to repair a flooded basement?
Commonly $5,440–$10,200 for a 500 square foot flooded area, and $15,040–$28,200 for 1,500 square feet. At the default $12 per square foot plus extraction and equipment, 500 square feet works out to about $6,800 mid-range. A finished basement costs multiples of an unfinished one for the same footprint.
Does homeowners insurance cover a flooded basement?
Not if the water came from outside. Rain, river water, surface runoff and rising groundwater are all flood, and flood is excluded from every standard homeowners policy — it needs an NFIP or private flood policy bought separately, typically with a 30-day waiting period. A burst pipe that flooded the same basement would be covered.
What should I do first when the basement floods?
Cut the power to the basement at the breaker before going down, then shut off the water source if it is internal. Photograph everything before you move it — that documentation is what an adjuster works from. Then get the water out and air moving within 24 hours, because that is the window before mold becomes part of the job.
Is it worth finishing a basement that has flooded before?
Only after the cause is fixed and proven through a wet season. If you do refinish, the cost-effective approach is flood-resilient: closed-cell foam instead of fiberglass insulation, cement board or PVC trim at the base, and a floating floor that can be lifted rather than carpet. It costs a little more and survives the next event.