Most homeowners pay $2,500–$8,000 for crawl space foundation repair, with national averages of about $5,500–$6,000. Simple fixes such as sistering a few joists or sealing cracks cost a few hundred dollars, while underpinning or major structural work can reach $15,000 or more (Angi, HomeGuide and Fixr data, as of October 2026).
Updated October 8, 2026. Source: Angi + 4 more. National US estimates.
Homes built over a crawl space rest on perimeter walls plus interior piers, beams and floor joists. When the soil settles, wood rots from moisture or termites damage the framing, the first signs are usually bouncy or sloping floors, gaps under baseboards and doors that stick.
Below you'll find what typical crawl space structural repairs cost, a sample budget and the factors that move the price. If your house sits on piers with no continuous perimeter wall, our pier and beam foundation repair cost guide covers that system in more detail.
Average cost
Typical installed prices for crawl space foundation repairs, national averages as of October 2026:
| Scenario | Typical range | Notes |
|---|---|---|
| Minor repair: sister a few joists, seal cracks | $250–$2,000 | Joist sistering runs $150–$325 per joist; cracks $250–$1,000 |
| Moderate repair: new piers or support beam, some rot repair | $2,500–$8,000 | Most common range; averages near $5,500–$6,000 |
| Major repair: underpinning, wall stabilization or many joists | $6,000–$15,000+ | Soil movement, long sections of damaged framing |
Cost by repair type
| Repair | Typical cost | Notes |
|---|---|---|
| Joist sistering | $150–$325 per joist | Bolts a new joist alongside a weak one |
| Joist replacement | $350–$1,000 per joist | When the joist is rotted or broken |
| Support beam replacement | $1,500–$5,000 per beam | Includes temporary shoring |
| Replacing or adding piers | $1,000–$3,000 per pier | Concrete or steel; underpinning piers similar |
| Wood rot repair | $750–$5,000 | Depends on how much framing is affected |
| Wall stabilization (tiebacks) | $6,000–$12,000 | Bowing perimeter walls |
| Vapor barrier | $1,000–$4,000 | Often added after structural repairs |
Cost breakdown: materials, labor, permits and extras
Line-item estimate for fixing a sagging floor in a 1,500 sq. ft. crawl space: two new support piers, one replaced beam and four sistered joists. Ranges are national, as of October 8, 2026.
| Cost item | Typical range | What it covers |
|---|---|---|
| New piers (2) | $2,000–$4,000 | Concrete or steel piers, $1,000–$2,000 each |
| Support beam replacement (1) | $1,500–$3,000 | Beam, temporary shoring and installation |
| Joist sistering (4 joists) | $600–$1,300 | $150–$325 per joist |
| Structural engineer plan | $250–$1,000 | Often required for beam and pier changes |
| Permits | $75–$150 | Varies by city |
| Contingency (about 10%) | $400–$900 | Rot or termite damage found once work starts |
| Estimated total | $4,800–$10,500 | Before any discounts or rebates |
Labor typically accounts for 50%–80% of a crawl space repair bill, because crews work lying down in tight spaces.
What affects the price
- Number of piers or supports to add or replace. Each pier added or replaced costs about $1,000–$3,000, so the count drives the total. A single sagging spot may need one or two; a whole floor line can need several.
- Beam and joist repair. Sistering a joist costs $150–$325, replacing one $350–$1,000, and a new support beam $1,500–$5,000. Replacing joists across a full level can reach $10,000–$30,000.
- Moisture or wood rot found. Rot repair runs $750–$5,000 depending on how much wood has to be cut out. Mold treatment adds about $500–$6,000; see our crawl space mold remediation cost guide.
- Height and access of the crawl space. Crawl spaces under about 18 inches are slow and difficult to work in, so labor, which already makes up 50%–80% of the cost, rises further. Some contractors have to dig out access first.
- Termite or pest damage. Termite damage means replacing framing and treating the house; treatment adds about $225–$2,500, or $500–$2,000 when bundled with a pier and beam repair.
- Drainage or encapsulation added. Fixing the moisture source prevents repeat repairs: a vapor barrier costs $1,000–$4,000, a drainage system $800–$4,000 for simple jobs and full encapsulation $1,500–$15,000.
Ways to save
- Hire an independent structural engineer ($250–$1,000 for a plan) so contractors bid on the same number of piers, beams and joists.
- Sister joists instead of replacing them where the engineer approves it; sistering costs roughly a third of replacement per joist.
- Combine structural work with a vapor barrier or encapsulation in one visit to avoid paying twice for crew setup and access.
- Fix gutters, downspouts and grading first so water stops reaching the crawl space; it is far cheaper than repeated rot repairs.
- Get at least three written quotes and ask each contractor to list the exact count of piers, beams and joists included.
How to get an accurate quote
Get at least three written quotes from licensed foundation contractors. Give each the same information:
- Square footage of the house and crawl space height, plus any access issues (small hatch, low clearance, ductwork).
- Symptoms: where floors sag or bounce, any visible rot, standing water, mold or termite activity.
- Ask for itemized pricing per pier, beam and joist, engineering and permits, debris removal, and the warranty on the work.
FAQ
How long does crawl space foundation repair take?
Sistering joists or adding a few piers usually takes one to three days. Beam replacement or extensive rot repair can take a week or more, especially when the crawl space is tight.
Can sagging floors over a crawl space be fixed without lifting the house?
Usually yes. Contractors jack the floor up gradually from inside the crawl space, then add piers, beams or sistered joists to hold it at the new height.
Is crawl space repair cheaper than basement foundation repair?
Generally yes. Crawl space repairs typically cost $2,500–$8,000, while major basement wall stabilization can run $2,500–$25,000 because of excavation or wall bracing.
For the big picture, start with our complete foundation repair cost guide.
Related cost guides
Sources
- Angi — How Much Does Crawl Space Repair Cost? (updated Oct 8, 2026). Checked October 8, 2026.
- HomeGuide — How Much Does Crawl Space Repair and Cleaning Cost? (2026) (Feb 5, 2026). Checked October 8, 2026.
- HomeGuide — How Much Does It Cost to Repair a Sagging Floor? (2026) (Feb 6, 2026). Checked October 8, 2026.
- HomeGuide — How Much Does Pier and Beam Foundation Repair Cost? (2026) (Dec 19, 2025). Checked October 8, 2026.
- Fixr — Crawl Space Repair Cost (updated Jan 31, 2025). Checked October 8, 2026.
Prices are estimates and vary by location and provider. See our methodology and editorial policy. Browse all foundation & water cost guides.