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Crawl Space Repair & Moisture Remediation

Crawl space repair averages $6,000 ($4,500–$8,000). See costs for sagging floors, piers, drainage, sump pumps and mold cleanup, plus permit rules near you.

  • Full encapsulation typically $5,000–$15,000, average $5,500 (Angi)
  • Vapor barrier installed $2–$4 per sq ft (HomeGuide)
  • Dehumidifier installed $1,000–$3,000 (HomeGuide)
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About Crawl Space Repair & Moisture Remediation

Encapsulation often uncovers work that has to come first: standing water, rotted or sagging joists, settling piers or mold on the subfloor. Angi puts typical crawl space repair at $4,500–$8,000, averaging $6,000, or $3–$5.50 per square foot. Structural problems run $6,000–$15,000 and standing water $2,000–$10,000.

Water comes first, because nothing else holds without it. NC R409 requires a drain to daylight or a sump pump at each low spot of a closed crawl space. HomeGuide prices sump installation at $600–$2,500 and drainage at $800–$3,000. For mold, EPA's guidance is to fix the water problem and clean up the mold. It says homeowners can usually handle areas under about 10 sq ft, and larger areas call for its remediation guidance. HomeGuide puts crawl space mold remediation at $1,500–$4,000. Structural repairs need a permit in every market we cover.

Cross-section of a vented crawl space with a bare dirt floor. Humid outside air flows in through an open foundation vent and condenses into droplets on a cool HVAC duct and the floor framing. Moisture evaporates up from the bare soil, and surface water from grading that slopes toward the house collects in a puddle at a low spot of the crawl space floor.
Water comes first because it causes the rest: humid air through the vents, evaporation from bare ground and drainage toward the house wet the framing over time.

Common Jobs We Route

  • Sagging floor and joist sistering or beam repair (beam $1,500–$5,000; sagging floor $1,500–$10,000)
  • Supplemental piers or underpinning ($1,000–$3,000 per pier; underpinning $3,000–$15,000)
  • Crack repair (minor $250–$1,000; major $3,000–$10,000)
  • Interior drainage and sump ($800–$3,000 drainage; sump $600–$2,500; full interior drainage $4,000–$12,000)
  • Mold cleanup in the crawl space ($1,500–$4,000; Angi $1,000–$6,000)
  • Wall stabilization ($6,000–$12,000)
Numbered section of a vented crawl space showing what to check yearly: 1 standing water, 2 wet or sagging insulation at the rim joist, 3 white powder and stains on the wall, 4 mold on subfloor or joists, 5 a sagging joist and a post off its pier, 6 a torn vapor barrier, 7 a disconnected duct, 8 pest droppings. Bad readings per DOE: wood moisture over 18%, humidity over 70%.
Repairs come before the liner: standing water, sagging framing, posts off their piers and mold all have to be fixed first.

What Affects the Price

Providers quote their own work — these are the factors that consistently move the number.

  • Underlying issue: minor moisture $250–$4,000 vs structural $6,000–$15,000
  • Number of piers or joists and access height
  • Engineering letter and permit (Angi permits $50–$250; Johnston County NC remodel permit $200 for the first 400 sq ft plus $75 per trade)
  • Labor is 50–80% of repair cost (Angi)

Cost Guides

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Crawl Space Repair & Moisture Remediation FAQs

How much does crawl space repair cost?

Angi: typically $4,500–$8,000, averaging $6,000. Structural repairs run $6,000–$15,000.

Should repairs happen before encapsulation?

Both sources list repairs and cleaning as separate, earlier line items. HomeGuide puts cleaning and repairs at $500–$8,000. Water and structure come before the liner.

Is mold in a crawl space dangerous?

We don't make health claims. EPA says molds have the potential to cause health problems, that allergic reactions are common, and that the key is moisture control. Health questions go to your doctor or local health department.

Do structural repairs need a permit?

Yes in the jurisdictions we checked: Jefferson County, AL lists 'Foundation/Structural Repair' as a permit type; Chesterfield and Henrico, VA require permits for structural work.

Crawl Space Repair & Moisture Remediation by Area

Crawl Space Repair & Moisture Remediation in Wake County, NCCrawl Space Repair & Moisture Remediation in Johnston County, NCCrawl Space Repair & Moisture Remediation in Franklin County, NCCrawl Space Repair & Moisture Remediation in Henrico County, VACrawl Space Repair & Moisture Remediation in Chesterfield County, VACrawl Space Repair & Moisture Remediation in Jefferson County, AL

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