How much does foundation crack repair cost in San Antonio?

Hairline monitoring and sealing: $200–$600. Epoxy injection on a single structural crack: $500–$1,500. Multiple cracks with carbon fiber straps: $1,500–$4,000. If cracks signal slab drop, full piering ($7,000–$15,000+) may be needed. Crack repair alone will not hold a moving foundation.

What crack width means I need to call?

Watch any crack wider than 1/8 inch, stair-step patterns in brick, horizontal cracks in block walls, or cracks that grew after rain. The penny test: if a penny slides in, schedule an inspection. Hairline vertical drywall cracks without sticking doors are often cosmetic, still worth documenting in San Antonio clay.

Why do cracks appear after rain in San Antonio?

Expansive clay swells when wet after drought, pushing on the slab and exterior walls. That pressure opens cracks quickly, sometimes within days of a heavy storm. Cracks that open and close seasonally signal active movement, not just age.

Can I DIY epoxy injection on foundation cracks?

Surface sealants hide the symptom without bonding the full crack depth. Structural epoxy injection requires pressure ports and proper prep. Done wrong, water keeps entering and the crack widens. We recommend professional diagnosis first; DIY is fine for monitoring, not for structural cracks.

Do interior drywall cracks mean foundation damage?

Often yes, but the interior crack may not sit above where the slab failed. We map interior and exterior cracks together and run an elevation survey. Drywall-only cracks near corners without floor slope may be truss uplift: different fix, different cost.

Will crack repair help me sell my San Antonio home?

Documented repair with warranty reassures buyers more than undisclosed cracks. For minor sealed cracks with stable elevation, a written inspection report may be enough. Active movement should be fixed or priced into the sale. Buyers in Stone Oak and Alamo Heights will notice.

Foundation Crack Repair | San Antonio TX

Not every crack means disaster, but in San Antonio's expansive clay soil, cracks that grow after rain or drought cycles need attention now. We diagnose whether a crack is cosmetic or structural, then fix it permanently.

Types of Foundation Cracks

Hairline vertical cracks: often cosmetic, but worth monitoring
Horizontal cracks: soil pressure on walls; act quickly
Stair-step cracks in brick or block: differential settlement
Wide cracks (>¼ inch): structural movement underway

Cracks Widening After Rain? Call Now

The Penny Test & When to Worry

Slide a penny into the crack. If it fits easily, or the crack is wider at the top than the bottom, call for an inspection. Clay soil expands after heavy rain and contracts during drought. Cracks that open and close with the seasons signal active movement. Epoxy alone will not hold.

Document cracks with photos and dates. San Antonio homeowners who track changes after spring storms give us the best data for deciding repair vs. monitor. Stable hairline cracks with level floors and closing doors can wait. Growing stair-step brick cracks cannot.

Foundation crack repair cost in San Antonio

Price depends on whether the crack is cosmetic, structural, or a sign of slab drop requiring piering.

Scope	Typical range
Hairline seal / monitoring	$200 – $600
Single crack epoxy injection	$500 – $1,500
Multiple cracks + carbon fiber straps	$1,500 – $4,000
Active slab movement (piers required)	$7,000 – $15,000+
Full foundation repair (if crack is a symptom)	~$12,663 avg

Ranges reflect San Antonio market conditions. Final price depends on inspection findings. We quote in writing before work begins.

Get free estimate

When Crack Repair Is Not Enough

Epoxy injection bonds the concrete, but it does not stop a slab that is still dropping. If an elevation survey shows corners down more than about an inch, or doors are sticking across multiple rooms, you need stabilization (piers or lifting), not just sealing. We tell you which category you are in before quoting.

A $500 injection today saves thousands when the slab is stable. It wastes money when the foundation is still moving; the crack rips open again within a season. That is why every crack call starts with inspection, not a one-size-fits-all seal.

Our Crack Repair Methods

We use high-pressure epoxy injection to fill and bond structural cracks from the inside out. For bowing or shifting walls, carbon fiber straps add tensile strength without excavation. Polyurethane foam seals active leaks in wet conditions.

Every repair includes before-and-after photos and a written warranty. Most crack repairs are completed in a single day with minimal disruption to your landscaping.

Interior vs. Exterior Cracks

Drywall cracks often trace back to foundation movement, but the crack you see inside may not match where the slab actually failed. We map both interior and exterior cracks together so repairs target the real problem, not just the visible symptom.

Call (830) 244-0222 for emergency same-day service across Bexar County.

San Antonio Slab Repair · 454 Soledad Street, 3rd Floor, San Antonio, TX 78205 · (830) 244-0222

Questions & answers