{
  "title": "Soft Spot in the Floor or Mold in the Crawlspace — Who Do I Call?",
  "description": "A bouncy floor and a musty crawlspace are usually the same problem wearing two faces: moisture. Who to call in what order — and when it's a structural engineer, not a contractor.",
  "category": "home",
  "vertical": "water-damage",
  "tldr": "A soft spot in the floor means something under it is wet or was: find the moisture first. Above a crawlspace, that's a flashlight inspection — mold, standing water, or crushed insulation tells you which pro. Order matters: fix the water source (plumber or drainage), then mold remediation ($500–$2,000 for a crawlspace), then the wood repair (joists $200–$2,000 each, subfloor $3.50–$12/sq ft). Widespread sag or anything near the foundation: structural engineer first, $300–$600, before any contractor quotes.",
  "who_to_call": [
    {
      "who": "Your own flashlight, first",
      "when": "Floor is soft above a crawlspace or basement — look under the spot before calling anyone: water, mold, insulation condition, and daylight through vents tell the story",
      "not_for": null
    },
    {
      "who": "Plumber",
      "when": "The soft spot is near a bathroom, kitchen, or laundry, or you find a supply/drain leak below — the wood repair is pointless until the water stops",
      "not_for": null
    },
    {
      "who": "Mold remediation company",
      "when": "Visible growth in the crawlspace beyond a small patch — they treat and remove; they don't fix the moisture source or the framing",
      "not_for": "You haven't found and stopped the water yet"
    },
    {
      "who": "General contractor or carpenter",
      "when": "Structure is dry and treated — they sister or replace joists and replace subfloor",
      "not_for": null
    },
    {
      "who": "Structural engineer",
      "when": "Multiple soft spots, visible sag, cracks in walls above, or anything involving beams or foundation — $300–$600 buys a diagnosis from someone with nothing to sell you",
      "not_for": null
    }
  ],
  "costs": [
    {
      "item": "Crawlspace mold removal",
      "range": "$500–$2,000",
      "source": "Fixr",
      "source_url": "https://www.fixr.com/costs/mold-remediation"
    },
    {
      "item": "Floor joist repair (sistering)",
      "range": "$200–$500 per joist",
      "source": "Fixr",
      "source_url": "https://www.fixr.com/costs/repair-floor"
    },
    {
      "item": "Floor joist replacement",
      "range": "$500–$2,000 per joist",
      "source": "Fixr",
      "source_url": "https://www.fixr.com/costs/repair-floor"
    },
    {
      "item": "Subfloor replacement",
      "range": "$3.50–$12 per sq ft",
      "source": "Fixr",
      "source_url": "https://www.fixr.com/costs/replace-subfloor"
    },
    {
      "item": "Structural engineer (foundation inspection)",
      "range": "$300–$600 (full-home assessment $500–$2,000)",
      "source": "Fixr",
      "source_url": "https://www.fixr.com/costs/structural-engineer"
    },
    {
      "item": "Crawlspace encapsulation (the permanent moisture fix)",
      "range": "$2,000–$15,000 ($2–$6 per sq ft)",
      "source": "Fixr",
      "source_url": "https://www.fixr.com/costs/crawl-space-repair"
    },
    {
      "item": "Foundation repair (if it's gone that far)",
      "range": "$2,200–$8,200",
      "source": "Fixr",
      "source_url": "https://www.fixr.com/costs/repair-foundation"
    }
  ],
  "faq": [
    {
      "q": "Is a soft spot dangerous, like fall-through-the-floor dangerous?",
      "a": "Rarely overnight, but it's not stable either — softness means the subfloor or joists have lost strength to rot, and they don't regain it. Keep heavy furniture off the spot, and treat a spot that visibly grows, sags, or creaks worse over weeks as a this-month problem, not a someday problem."
    },
    {
      "q": "Can I just screw down new plywood over the soft spot?",
      "a": "That's hiding it, not fixing it. The wood softened because of moisture; cover it and the rot continues underneath, now invisible, spreading to joists that cost $500–$2,000 each to replace instead of $3.50–$12 per square foot of subfloor. Find the water, dry the structure, then re-deck."
    },
    {
      "q": "The crawlspace smells musty but I don't see mold. Problem or not?",
      "a": "Musty IS the moisture alarm — mold you can't see yet, or ground moisture feeding toward it. Check the usual suspects: torn or missing vapor barrier on the dirt floor, blocked vents, ducts sweating condensation, grading that sends rain under the house. Fixing those now is hundreds; the encapsulation-and-remediation version later is thousands."
    },
    {
      "q": "Every crawlspace company wants to sell me encapsulation. Do I need it?",
      "a": "Sometimes — but it's also the industry's default upsell. Encapsulation ($2,000–$15,000) genuinely solves chronically wet crawlspaces. If your moisture traces to one fixable cause — a plumbing leak, a downspout dumping at the foundation, a torn $200 vapor barrier — fix that first and re-inspect in a season. A company that quotes encapsulation without identifying WHERE the moisture comes from is selling a product, not a diagnosis."
    },
    {
      "q": "When is this a foundation problem instead of a floor problem?",
      "a": "When the pattern is structural: floors sloping toward a wall, multiple rooms affected, stair-step cracks in block walls, doors that stopped latching upstairs. That's beam/post/foundation territory — get the structural engineer's report ($300–$600) before any repair company's quote, because foundation repair averages $5,200 and you want the scope defined by someone who doesn't sell the fix."
    }
  ],
  "sources": [
    {
      "label": "Fixr: Floor repair costs (joists)",
      "url": "https://www.fixr.com/costs/repair-floor",
      "accessed": "2026-08-11"
    },
    {
      "label": "Fixr: Subfloor replacement cost",
      "url": "https://www.fixr.com/costs/replace-subfloor",
      "accessed": "2026-08-11"
    },
    {
      "label": "Fixr: Crawl space repair and encapsulation",
      "url": "https://www.fixr.com/costs/crawl-space-repair",
      "accessed": "2026-08-11"
    },
    {
      "label": "Fixr: Mold remediation cost",
      "url": "https://www.fixr.com/costs/mold-remediation",
      "accessed": "2026-08-11"
    },
    {
      "label": "Fixr: Structural engineer fees",
      "url": "https://www.fixr.com/costs/structural-engineer",
      "accessed": "2026-08-11"
    },
    {
      "label": "Fixr: Foundation repair cost",
      "url": "https://www.fixr.com/costs/repair-foundation",
      "accessed": "2026-08-11"
    },
    {
      "label": "EPA: Mold testing and standards",
      "url": "https://www.epa.gov/mold/mold-testing-or-sampling",
      "accessed": "2026-08-11"
    }
  ],
  "updated": "2026-08-11",
  "url": "https://whodoicallfor.com/home/soft-spot-in-floor/",
  "json_url": "https://whodoicallfor.com/home/soft-spot-in-floor.json",
  "recommended_call": null
}