Polyjacking for void filling and minor lifting
A contractor should explain why this method fits the observed movement, soil conditions, drainage, and load path before asking for a signature.
FoundationCost.ai
Slab Foundation Repair Cost Calculator
Estimate slab foundation repair cost for concrete slab settlement, sinking slabs, cracks, and foundation slab repair options such as piers, polyjacking, and drainage work.
Typical repairs$1,800-$14,000
Major settlement$14,000-$35,000+
Quote signalsScope, warranty, piers, drainage
Best next stepCompare diagnosis before price
Free calculator
Estimate Your Foundation Repair Cost
Enter what you know. The range updates instantly and stays conservative.
Low
$2,500
Typical
$8,500
High
$20,000
ConfidenceLow
Likely repair methods
- Polyjacking or mudjacking
- Steel piers
- Helical piers
- Soil moisture correction
Main cost drivers
- Moderate visible severity
- normal access around the affected area
- unknown foundation type
- 2,000 sq ft home size
Questions to ask
- What failure mode are you diagnosing, and what evidence supports it?
- Does this quote include permits, engineering, cleanup, and warranty terms?
- Which line items are required now, and which are optional upgrades?
- How will drainage, grading, or plumbing leaks be ruled out before repair?
- Can you show comparable local projects with similar foundation conditions?
Second opinion
Get a Quote Review Checklist
Send the basic project details and quote text. The form is built to work before you add a mail provider, and can email leads once `RESEND_API_KEY` and `LEAD_TO_EMAIL` are set.
Good for high-price pier, waterproofing, slab, and crawl space quotes.
Avoids collecting payment or sensitive documents on the first pass.
Short answer
What Homeowners Should Know First
Slab foundation repair often ranges from $2,500 to $20,000, with major settlement or pier systems costing more. The biggest pricing drivers are pier count, lift complexity, access, plumbing risk, and drainage or soil moisture correction.
Main Cost Drivers
- Sinking slab area and severity
- Steel pier, helical pier, mudjacking, or polyjacking method
- Plumbing leak investigation under the slab
- Drainage, grading, and soil moisture correction
Compare Repair Scopes
| Scope | Typical range | Best for | Confirm first |
|---|---|---|---|
| Polyjacking | $2,000-$12,000 | Void filling and limited slab lift | Foam specs and cause of voids |
| Mudjacking | $1,500-$8,000 | Some settled concrete areas | Structural settlement limits |
| Steel piers | $8,000-$35,000+ | Load-bearing settlement | Pier count and lift plan |
| Drainage correction | $1,000-$8,000+ | Moisture-related movement | Discharge and grading scope |
Average Foundation Repair Costs
| Repair type | Low | Typical | High |
|---|---|---|---|
| Hairline crack sealing | $500 | $1,800 | $5,000 |
| Foundation leak repair | $1,200 | $4,500 | $12,000 |
| Slab foundation repair | $2,500 | $8,500 | $20,000 |
| Pier and beam repair | $3,000 | $9,500 | $25,000 |
| Settlement repair with piers | $5,000 | $14,000 | $35,000 |
| Bowing wall stabilization | $4,000 | $12,000 | $30,000 |
Common Repair Methods
Mudjacking for some concrete slab lift scenarios
A contractor should explain why this method fits the observed movement, soil conditions, drainage, and load path before asking for a signature.
Steel piers for deeper load-bearing support
A contractor should explain why this method fits the observed movement, soil conditions, drainage, and load path before asking for a signature.
Drainage and soil moisture correction
A contractor should explain why this method fits the observed movement, soil conditions, drainage, and load path before asking for a signature.
Warning Signs to Take Seriously
Cracks through tile or concrete floors
Slab edges separating from exterior walls
Interior doors rubbing after seasonal changes
Gaps at baseboards or cabinets
Plumbing leaks suspected under the slab
Already Have a Contractor Quote?
Paste the quote into the checker to identify vague scopes, missing warranty details, and questions worth asking before you commit.
Questions to Ask a Contractor
What is the exact cause of the movement or water intrusion?
Ask for a plain-language answer and make sure the final contract matches what you were told verbally.
Is an engineer letter included or recommended?
Ask for a plain-language answer and make sure the final contract matches what you were told verbally.
How many piers, anchors, drains, or injection points are included?
Ask for a plain-language answer and make sure the final contract matches what you were told verbally.
What warranty is transferable, and what can void it?
Ask for a plain-language answer and make sure the final contract matches what you were told verbally.
Does the price include permits, utility marking, cleanup, and landscape restoration?
Ask for a plain-language answer and make sure the final contract matches what you were told verbally.
FAQ
How accurate is an online foundation repair cost calculator?
It can provide a planning range, but final pricing depends on soil conditions, access, structural movement, drainage, permits, and the contractor's diagnosis.
Should I get more than one foundation repair quote?
Yes. Compare the diagnosis, method, warranty, pier count or material quantities, and exclusions. The cheapest quote is not always the safest scope.
When should I call a structural engineer?
Call an engineer when there is active movement, large or horizontal cracking, bowing walls, major water intrusion, or conflicting contractor recommendations.
Does homeowners insurance cover foundation repair?
Often it does not cover settlement or long-term drainage issues, but sudden covered events may be different. Ask your insurer and review the policy language.
Why does slab foundation repair cost vary so much?
The largest drivers are pier count, lift complexity, access, plumbing investigation, soil movement, and whether drainage or moisture correction is included.
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Disclaimer
This tool provides educational cost estimates only. It is not a structural engineering report, legal advice, or a substitute for an inspection by a licensed professional.