Water damage repair cost calculator
Updated July 2026 · built on published national cost data · free, no signup
Answer four questions and get an honest planning range for professional water damage mitigation — the same factors a restoration estimator prices first: area, contamination category, standing water, and how long it's been wet.
- Drying & restoration, clean water (cat 1): ~$3.75–$5.25/sq ft × 300 sq ft
How this calculator works (and what it can't know)
Restoration pricing starts from the IICRC S500 standard — the industry's framework for water damage work. It classifies water by contamination: Category 1 (clean, from a sanitary source like a supply pipe), Category 2 (gray — appliance discharge, roof leaks), and Category 3 (black — sewage or rising floodwater). Category drives cost more than anything else: Cat 1 can often be dried in place, while Cat 3 usually means removing carpet, drywall and insulation.
We multiply your affected area by the published per-square-foot range for that category (~$3.50–$7.50), add extraction if water is still pooled, add the published mold-remediation range ($1,100–$3,400) when water has sat past 72 hours, and apply a disclosed ±15–20% adjustment for clearly high- or low-cost labor markets. What no calculator can see: hidden water paths inside walls, wet insulation, subfloor damage, and access difficulty — which is why the output is a planning range, and the only real number is an on-site assessment (reputable firms inspect free).
What typically drives the bill up
| Factor | Why it matters |
|---|---|
| Time wet > 24–48h | Mold can begin colonising within 24–48 hours; past ~72 hours remediation is likely, adding $1,100–$3,400. |
| Water category | Cat 3 roughly doubles Cat 1 per-square-foot cost — contamination forces removal instead of drying. |
| Wet building cavities | Water inside walls/ceilings needs opening up, more equipment, longer drying. |
| Finished basements | More materials to remove and rebuild than unfinished space. |
| Rebuild scope | Mitigation dries the structure; drywall, flooring and paint are a second, separate line. |
Common questions
How much does water damage restoration cost per square foot?
Industry cost guides put professional water damage restoration at roughly $3.50–$7.50 per square foot depending on the water category: clean supply-line water sits at the bottom of the range, and contaminated (black) water at the top because porous materials usually must be removed and the space sanitised.
What is the average cost of water damage repair?
The national average for professional water damage restoration falls between $1,300 and $5,600 per incident. Severe events — deep flooding, sewage, or long-standing water — regularly exceed $10,000 once demolition and rebuild are included.
Does the estimate include rebuilding walls and flooring?
No — like real restoration quotes, this estimates mitigation and structural drying. Rebuild (replacement drywall, flooring, trim, paint) is scoped separately once the structure is verified dry, because the extent of demolition isn't known until drying is complete.
Will insurance pay for this?
Standard homeowners policies generally cover water damage that is sudden and accidental (like a burst pipe) but exclude gradual leaks, poor maintenance, and outside flooding — flood needs a separate policy. Use our insurance claim estimator to check your scenario.
Next: check what insurance is likely to pay with the insurance claim estimator, or if this is happening right now, follow the first-60-minutes checklist.
Put this calculator on your website — free
Restoration companies, plumbers, insurance agents, local news: embed the calculator free. One condition — the “Free tool by Lumen & Ink” attribution link stays visible. Paste this where you want it to appear:
<iframe src="https://restorationanswers.com/embed/water-damage-calculator" width="100%" height="920" style="border:0;max-width:760px" title="Water Damage Cost Calculator" loading="lazy"></iframe>
Sources & methodology
Every figure on this page comes from the published references below — never invented, never inflated. Costs are national ranges; your local market, access, and materials move real quotes in both directions.
This is general information, not insurance, legal, or engineering advice. Estimates are planning ranges, not quotes — always get on-site assessments, and confirm coverage against your own policy wording or with your insurer.