Crawl Space Repair Cost (2026)
"Crawl space repair" is not one job. It covers structural work on joists and supports, water management, insulation replacement and mold removal — and the four have completely different prices. Most homeowners end up between $2,000 and $10,000, with $6,000 a fair midpoint for a house with more than one problem.
- How much does crawl space repair cost?
- Crawl space repair costs $1,500 to $15,000, and the figure depends entirely on what failed. Replacing insulation runs $1,000 to $4,000, sistering damaged floor joists $1,000 to $10,000, installing an interior drain and sump pump $3,000 to $8,000, and replacing a main beam $2,500 to $12,000.
- How much does it cost to fix sagging floors from a crawl space?
- Fixing sagging floors from below costs $1,000 to $10,000. Adjustable support jacks run $150 to $500 each installed and often solve mild sag. Sagging caused by rotted joists or a failed girder means sistering or beam replacement, which puts the job in the $4,000 to $12,000 range.
- Is crawl space repair covered by homeowners insurance?
- Sudden, accidental damage is usually covered — a burst pipe that soaked the crawl space, for example. Damage from long-term humidity, groundwater seepage, poor drainage or deferred maintenance is almost always excluded as wear and tear. Flood damage needs separate flood insurance.
- How do I know whether the crawl space or something else is the problem?
- Cupped or sloping floors, doors that stop latching, a musty smell on the first floor and visible condensation on ductwork all point downward. A crawl space inspection costs $100 to $500 and identifies which of the four repair categories you are actually in, which is worth paying for before collecting quotes.
| What you're pricing | Low | Typical | High |
|---|---|---|---|
| Replace crawl space insulationRemove fallen batts, install new; 1,500 sq ft | $1,000 | $2,200 | $4,000 |
| Sistering damaged floor joists$100–$400 per joist plus access labour | $1,000 | $4,000 | $10,000 |
| Support jacks / adjustable columns$150–$500 each installed, usually several | $800 | $2,000 | $5,000 |
| Beam replacementMain girder, includes temporary shoring | $2,500 | $5,500 | $12,000 |
| Interior French drain + sump pumpPerimeter trench, gravel, pump and discharge | $3,000 | $4,800 | $8,000 |
| Mold remediation in a crawl spaceScope depends on affected square footage | $1,500 | $3,500 | $6,000 |
| Subfloor replacementPer affected area, from below | $1,200 | $3,000 | $7,000 |
What drives the price
- Which system failed
- Insulation is the cheapest thing to fix and the most common to quote. Structural work — joists, beams, supports — is several times the price and the only category where delay makes the number grow.
- How many joists
- Sistering is priced per joist, $100 to $400 each installed. Two joists is a $700 job. Fifteen is a $5,000 one. Ask for the count on the quote, not just the total.
- Whether water is still coming in
- Repairing rot without fixing drainage means paying twice. A contractor who quotes structural work and says nothing about where the water came from has quoted half a job.
- Access
- Everything in a crawl space is done lying down. Low headroom, tight hatches and obstructed runs add labour to every line item, typically 10 to 20%.
Read the quote as four separate jobs
Almost every crawl space repair quote mixes structural work, water management, insulation and remediation into a single number. Ask for it split. The split tells you which parts are urgent — structural and water — and which are comfort and efficiency, which can wait a season if the budget is tight.
It also tells you whether the contractor has diagnosed anything. A quote that lists "crawl space repair — $9,400" is a sales document. A quote that lists eleven sistered joists, four support jacks, 140 linear feet of drain and a 60-pint dehumidifier is an estimate.
What is urgent and what is not
Urgent: standing water, active rot in joists or a girder, a failing support. These get worse and the cost of waiting is compounding — a joist that needs sistering this year may need replacing next year, at three times the price.
Not urgent: fallen insulation, an old thin vapor barrier, general mustiness without measurable damage. These are worth fixing, and worth fixing as one project alongside encapsulation, but a month of delay costs nothing.
Repair first, then seal
The correct order is diagnose, dry, repair, then encapsulate. Sealing a crawl space that still has an active water source or rotten framing traps the problem behind a liner where nobody will look at it for ten years.
Contractors who lead with encapsulation on a house with structural symptoms are selling the product they have, not the job the house needs. It costs $100 to $500 to get an independent inspection first, and on a $10,000 decision that is cheap.
Common questions
- How much does crawl space repair cost?
- Crawl space repair costs $1,500 to $15,000, and the figure depends entirely on what failed. Replacing insulation runs $1,000 to $4,000, sistering damaged floor joists $1,000 to $10,000, installing an interior drain and sump pump $3,000 to $8,000, and replacing a main beam $2,500 to $12,000.
- How much does it cost to fix sagging floors from a crawl space?
- Fixing sagging floors from below costs $1,000 to $10,000. Adjustable support jacks run $150 to $500 each installed and often solve mild sag. Sagging caused by rotted joists or a failed girder means sistering or beam replacement, which puts the job in the $4,000 to $12,000 range.
- Is crawl space repair covered by homeowners insurance?
- Sudden, accidental damage is usually covered — a burst pipe that soaked the crawl space, for example. Damage from long-term humidity, groundwater seepage, poor drainage or deferred maintenance is almost always excluded as wear and tear. Flood damage needs separate flood insurance.
- How do I know whether the crawl space or something else is the problem?
- Cupped or sloping floors, doors that stop latching, a musty smell on the first floor and visible condensation on ductwork all point downward. A crawl space inspection costs $100 to $500 and identifies which of the four repair categories you are actually in, which is worth paying for before collecting quotes.
How we price this. Figures are national 2026 estimates built from contractor quote ranges, material pricing and regional labour rates, then cross-checked against published industry cost data. Reckon Home does not sell, broker or perform this work. Use these numbers to judge whether a quote is reasonable — not as a quote.