Calculator Inputs
Enter structure, damage, labor, material, and uncertainty values. Then submit the form.
Example Data Table
| Scenario | Length | Width | Settlement | Pier Spacing | Crack Length | Drainage Length | Expected Use |
|---|---|---|---|---|---|---|---|
| Small slab repair | 32 ft | 24 ft | 0.75 in | 8 ft | 18 ft | 40 ft | Light settlement planning |
| Medium home repair | 48 ft | 32 ft | 1.50 in | 6 ft | 36 ft | 80 ft | Typical pier and water control estimate |
| Large perimeter repair | 70 ft | 45 ft | 2.25 in | 5 ft | 60 ft | 140 ft | Higher risk structural budget |
Formula Used
Footprint Area: A = length × width
Perimeter: P = 2 × (length + width)
Total Load: L = A × floors × (dead load + live load) + P × wall load
Soil Pressure: q = L / A
Safety Ratio: SR = soil bearing capacity / q
Spacing Pier Count: ceil((P × repair coverage) / pier spacing)
Load Pier Count: ceil((L × repair coverage) / (pier capacity × 2000 × 0.70))
Final Pier Count: max(spacing pier count, load pier count)
Total Estimate: direct costs + overhead + fees + contingency
How to Use This Calculator
- Enter the building length, width, floor count, and load values.
- Add soil bearing capacity from a local report when available.
- Enter the visible settlement, crack length, and repair coverage.
- Select a pier method or add a custom pier cost.
- Add drainage, waterproofing, slab lifting, and wall stabilization needs.
- Adjust labor, equipment, permit, overhead, and contingency values.
- Submit the form to view results above the calculator.
- Use CSV or PDF export for project notes and contractor discussions.
Foundation Repair Estimating Guide
A foundation repair estimate is not only a price guess. It is a structured review of load, soil response, access, damage size, and repair method. This calculator blends practical pricing with simple physics. It helps owners compare common repair paths before calling a contractor.
Why load matters
Every building pushes weight into the soil. The load depends on floor area, floor count, wall weight, and service loads. When soil pressure is higher than safe bearing capacity, settlement can grow. Piers, wall braces, drainage, and crack repairs reduce risk in different ways.
What drives the estimate
Pier count is a major cost driver. The tool estimates piers from perimeter spacing and load capacity. It then adds crack sealing, wall stabilization, drainage, slab lifting, excavation, permits, engineering, equipment, labor, and contingency. You can adjust rates to fit your market.
Using results carefully
The result is a planning estimate. It is not a stamped engineering design. Actual costs depend on soil tests, hidden utilities, structure age, pier refusal depth, crawl space access, concrete thickness, and code demands. Use the low and high range to plan a safer budget.
Better decisions
Run several scenarios. Compare helical piers with push piers. Change pier spacing and settlement size. Add drainage when water is a known cause. Save the CSV or PDF report for discussions. A clear estimate helps you ask better questions and understand contractor quotes.
Reading the cost range
The low range reduces the subtotal by the selected uncertainty margin. The high range adds the same margin. Wide ranges are useful when access is poor or soil data is limited. Narrow ranges fit simple repairs with clear measurements.
Physics limits
The pressure check compares estimated service load with soil bearing capacity. The safety ratio is capacity divided by pressure. A ratio below one suggests overload. A higher ratio does not prove safety. It only shows that the entered values pass this check.
Site notes
Photos, level readings, crack maps, and moisture notes improve estimates. Measure wall length and crack length. Record where doors stick. Note seasonal water. Small details often explain why settlement happened and which repair is most logical.
FAQs
1. Is this calculator a contractor quote?
No. It gives a planning estimate. A real quote needs an inspection, soil review, access check, measurements, and local pricing.
2. Why does the calculator use soil pressure?
Soil pressure shows how much load reaches each square foot of soil. It helps compare building load with entered bearing capacity.
3. What is the safety ratio?
The safety ratio compares soil capacity with estimated soil pressure. Higher values suggest more reserve, but they do not replace engineering judgment.
4. How is pier count estimated?
The calculator checks perimeter spacing and load capacity. It uses the larger count, so the result considers both layout and support demand.
5. Why include drainage in a repair estimate?
Water often causes soil movement near foundations. Drainage, sump pumps, grading, and waterproofing can reduce future settlement risk.
6. Can I change local prices?
Yes. Edit pier cost, labor rate, repair rates, equipment rate, fees, overhead, and contingency to match local market conditions.
7. What does access factor mean?
Access factor adjusts labor for tight crawl spaces, landscaping, concrete removal, limited equipment access, and difficult working conditions.
8. Should I use the high estimate?
Use the high estimate when soil data is limited, damage is hidden, utilities are unknown, or the project needs complex excavation.