FNF Foundation Repair's under-slab tunneling service in Houston, TX accesses plumbing systems, foundation components, and utility lines beneath your concrete slab by excavating a tunnel from outside the home perimeter — eliminating the need to jackhammer through interior flooring. Non-invasive. Fast. Locally owned.
Under-slab tunneling is a technique for accessing the area beneath a concrete slab foundation without breaking through interior flooring. Instead of jackhammering through your tile, hardwood, or concrete from inside the home, our crew excavates a horizontal tunnel from the exterior foundation perimeter inward — reaching the target area cleanly and efficiently.
This approach is used when plumbing repairs, pier installation, waterproofing, or utility work needs to be performed beneath an occupied home. It protects your interior floors and finishes, keeps your home livable throughout the repair, and eliminates the costly process of replacing tile or flooring afterward.
Compared to jackhammering through interior floors, tunneling causes no floor damage, keeps disruption minimal, requires no flooring replacement, contains dust and debris outside the home, and is typically completed in 1–3 days.
Jackhammering breaks through your interior floors, fills the home with dust and debris, and requires expensive flooring replacement afterward. Tunneling reaches the same point from outside — your floors are never touched. Our inspector confirms whether tunneling fits your home during your free assessment.
Houston's clay soil causes slab pipe failures more often than most U.S. cities. Tunneling lets us fix what's beneath your home while your floors, tile, and daily life stay exactly as they are.
Tunneling gets the job done without touching a single floor tile.
Schedule Free Tunneling Assessment →We inspect the exterior foundation perimeter, review any available plumbing or structural drawings, and determine the precise access point. We mark the excavation path and confirm the approach with you before breaking ground.
Free written assessmentOur crew excavates the tunnel from the exterior, working inward beneath the slab and shoring the walls as we go for structural integrity. The excavation is clean and contained — no interior work until the tunnel is complete.
No interior disruptionOnce the target work is complete, we restore the tunnel with compacted fill and concrete, and return the exterior to its original condition. A final inspection confirms stability.
Typically 1–3 daysReal footage of foam injection and stabilization performed beneath a slab — reached from outside the home so your floors stay untouched.
Tunneling is frequently paired with slab foundation repair when piers must be placed beneath finished floors.
Every home is different. The scope of work depends on the tunnel length and depth, your foundation type, soil conditions, and the repair being performed at the access point. There is no accurate way to give a price without seeing your home in person.
FNF Foundation Repair provides a free, no-obligation assessment and a clear written estimate — so you know exactly what needs to be done, and what it will cost, before you commit to anything.
Get My Free Written Estimate →FNF Foundation Repair provides under-slab tunneling across all 15 cities in our service area — from Pasadena and Pearland to Katy and The Woodlands.
We had a great experience with FNF Foundation. Erik and his crew were highly professional, arriving early and finishing our foundation lift in a single day. Erik took the time to answer all our questions, and the pricing was very fair. Highly recommended!
Erik is very knowledgeable and was able to get us a great evaluation. He is very honest and was able to provide very valuable feedback. Give FNF a call if you need their services.
I highly recommend FNF Foundation! Mr. Erik and his crew are professional, thorough, and honest, and their work is outstanding. I couldn’t be happier with the level of service and quality I received. If you’re in need of foundation repair, this is the company to call.
Still have questions? Our team is happy to help.
Call (713) 560-5843Our certified inspector assesses your foundation perimeter and access points, then delivers a written plan — at absolutely no cost and zero obligation. Honest answers, not a sales pitch.
No sales pressure. No obligation. Just honest answers about your home.
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Thank you — a member of the FNF Foundation Repair team will call you within 2 business hours to schedule your free inspection.