Underpinning a foundation reinforces your home’s structural integrity, especially if it shows signs of damage or you plan significant changes like a home addition. Here’s a detailed cost breakdown to help you plan.

Average Costs

| Expense | Cost Range |
|----------------------------------|------------------------------|
| Total Project | $11,300–$75,000 |
| Average Cost | $25,000 |
| Per Pier | $1,400–$3,500 (8–10 needed) |
| Building Permit | $2,000–$3,000 |
| Structural Engineer | $100–$200/hour |
| Excavation | $75–$200/hour |
| Contractor Labor | $100–$200/hour |

Cost by Underpinning Type

| Method | Cost |
|----------------------------------|------------------------------|
| Concrete Slab Underpinning | $3–$20/sq. ft. |
| Screw Pile Underpinning | $15–$30/linear foot |
| Grout Injection | $75–$230/materials |

Details:
- Concrete Slab: Environmentally friendly, less disruptive.
- Screw Piles (Helical Piers): Ideal for deep foundational support.
- Grout Injection: A modern, cost-effective solution if suitable.

Additional Cost Factors

• Foundation Type:
• Costs vary by foundation type (slab, crawl space, etc.).

• Some methods work better for specific foundation types.

• Foundation Damage:

• Extensive repairs before underpinning can increase costs.

• Environmental Factors:

• Poor soil quality or water drainage issues raise labor costs.

• Location:

• Urban areas with higher labor costs may inflate project expenses.

DIY vs. Hiring a Pro

• DIY Costs:
• Requires specialized equipment and materials.
• Costs may approach professional rates without expertise.

• Recommendation: Only attempt minor tasks like excavation prep.

• Hiring Professionals:

• Safer: Guarantees proper structural support.
• Comprehensive: Covers permits, inspections, and execution.

How to Save Money

• Get Multiple Quotes: Compare costs from local professionals.
• Grout Injection: Choose this method if applicable to your foundation.
• DIY Prep Work: Tackle simple tasks like clearing work areas.
• Bundle Services: Combine underpinning with other foundation repairs.

Signs Your House Needs Underpinning

• Cracks in Walls: Diagonal or widening cracks inside/outside.
• Sticky Doors and Windows: Difficulty opening/closing.
• Uneven Floors or Ceilings: Sloping, sagging, or bouncing surfaces.
• Old Foundations: Homes 80+ years old may require reinforcement.

Quick Facts

• Insurance Impact: Homes with a history of underpinning may have higher premiums.
• Alternatives to Underpinning: House lifting or structural shoring (often costlier).
• Typical Timeline: Underpinning projects can take weeks to complete.

Properly underpinning your foundation protects your home from structural issues and increases its lifespan. Work with trusted professionals to ensure the best results!

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