Foundation Repair vs. Replacement: How to Make the Right Call
Cracks, settling, bowing walls. When a foundation can be patched, when it needs underpinning, and when it's time to demo and pour new.
Diagnose before you decide
Hairline vertical cracks under 1/8 inch are usually cosmetic shrinkage and seal for under $500. Horizontal cracks, stair-step cracks in block walls, or any crack with offset signals structural movement and requires engineering review.
A licensed structural engineer's report runs $400 to $900 and is non-negotiable before spending five figures on repair. Compare to concrete slab repair logic.
When to repair
Isolated settlement: helical or push pier underpinning runs $1,500 to $3,000 per pier. Most settlement repairs use 6 to 12 piers, totaling $9k to $36k.
Bowing block walls under 2 inches: carbon fiber straps at $500 to $800 each, typically 6 to 10 straps per wall.
Bowing walls over 2 inches: wall anchors or full I-beam bracing, $500 to $700 per anchor.
When to replace
Multiple foundation walls compromised, deflection over 3 inches, or repair estimates exceeding 50% of replacement cost are the standard rules of thumb. Full foundation replacement runs $40k to $100k including structure lift, demo, excavating, pouring new footings and walls.
Frequently asked questions
Properly installed piers and carbon fiber repairs are permanent and typically come with transferable lifetime warranties.
Documented, engineer-stamped repairs with transferable warranties typically preserve or improve value.
Yes. Interior repairs and underpinning continue year-round.
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