Foundation Repair Cost Calculator

Fixr's 2026 guide puts the national average at $5,200, with most homeowners paying $2,200–$8,200 — that covers crack injection and smaller stabilization jobs. Structural underpinning runs deeper: this calculator's six-push-pier turnkey job computes to about $12,000 nationally, and HomeGuide's Nov 2025 sinking-foundation guide lists $4,500–$15,000 typical, up to $40,000 for severe cases.

For piers, wall anchors, or any permitted structural repair, most building departments want a stamped plan before issuing the permit, and a neutral engineer's report stops one contractor from selling you the biggest fix. Expect $500–$1,500 (national average ≈ $965 per Angi and Thumbtack data); this calculator adds $950 by default and you can switch it off for cosmetic crack work.

Helicals cost roughly $700 more per pier in this model — an 8-pier job runs about $21,200 vs $15,600 with push piers. They earn it on lighter structures (brick veneer, chimneys, additions) where push piers can buckle before developing resistance, on tension/uplift loads, and on tight sites where the torque-driven install avoids heavy equipment.

Walls bowing under 2 inches get carbon fiber straps; anything more gets steel wall anchors that are torqued back over months. On a 28-ft wall this model computes $5,100 for straps and $6,900 for anchors, inside the $4,000–$12,000 range contractor guides publish for bowed-wall systems. A wall too far gone to pull back rebuilds for $15,000–$25,000 — that's beyond what this calculator prices.

Mudjacking runs $3–$6 per sq ft of cement slurry and polyjacking $8–$25 per sq ft of expanding foam (HomeGuide, Nov 2025). Lifting 400 sq ft computes to about $1,800 vs roughly 3× that in foam. Poly is lighter (no extra weight on weak soil), drills dime-sized holes and lasts longer; mudjacking wins on big flatwork like driveways where material cost dominates.

Only if the wall isn't still moving. Injection ($1,800 for three cracks in this model, $250–$800 per crack across contractor guides) is the right fix for non-structural shrinkage cracks that have been stable for a year — mark the crack ends with a dated pencil line and re-measure each season before committing. The material follows the symptom: ports are bonded along the crack, epoxy is injected for a structural weld, and polyurethane is the choice where water seepage, not strength, is the complaint. Stair-step cracking in brick, widening cracks, or doors sticking mean settlement or wall movement — sealing those just hides the evidence the repair quote will be based on anyway.

Almost never for the repair itself — gradual settlement, expansive clay soil and normal movement are named exclusions on most policies. Coverage occasionally kicks in when a sudden covered event (a burst pipe undermining a footing, for example) caused the damage, and even then the carrier pays the pipe and resulting damage, rarely the underpinning. Budget for this one out of pocket.

Crack injection is half a day. Carbon fiber straps take 1–2 days per wall with everything done from inside — no excavation at all. Mudjacking a slab is usually done in a few hours and usable the same day. Piers and wall anchors need 2–4 days of excavation, and the crew needs a few feet of working room along the digging line: plan to move shrubs, pull downspout extensions, and flag irrigation lines before mobilization day. Interior piers mean cutting and re-pouring small floor sections — dust barriers go up, HVAC shuts off for the hammering days, and cosmetic patching makes the rooms presentable a couple of weeks later.