For realtors & home inspectors
Under-Slab Access for Repairs Before Closing
A failed hydrostatic test or a foundation note in the report doesn't have to kill the deal. The calendar is what kills it. We open the access fast so the repair and the re-test both land inside the option period, and so there is something specific to put in front of the buyer.

Agents and inspectors are usually first to know when an under-slab problem surfaces, and the question is always the same. Can this be fixed before we close? Two things decide the answer. How quickly the access opens, and what the buyer gets told while it is open. Digging is what takes the days, so the day the issue surfaces is the day to start. Then the paperwork matters, because a repair the buyer can't see is the hardest kind to close on. We photograph the access, the condition it exposed, and the finished backfill, so the file shows work rather than assurances.
When you call us
The jobs that need a tunnel.
Hydrostatic test failed in the option period
The buyer wants it fixed before closing. We dig to the leak fast so the repair and the re-test both fit the option days you have left.
The buyer wants to know what was done
Nobody can inspect a repair buried under a slab. We document the access, the exposed condition, and the backfill so the agent has something real to hand across the table.
Inspection flags possible foundation movement
A single line in a report can spook a buyer. Get eyes under the slab, or a free second opinion, so the negotiation runs on measurements.
Repair required before funding
A lender or a buyer requires the fix before closing. We open the access on a schedule built backward from the funding date.
A staged home still showing
Tunneling from outside keeps the interior presentable, so showings continue while the repair happens below the floor.
What you get
How we work with you.
What you refer reflects on you, so we treat your client like ours. A schedule we keep, a property left clean, and an honest read when the flagged issue turns out to be cosmetic, because telling your client not to spend protects your relationship better than a quick job would. When the repair is real we move on it, coordinate the licensed trade, and backfill before the walkthrough so the buyer sees a finished yard. Then ask us for the photos and the backfill record. Handing a buyer a documented repair at the table is worth more to the deal than the two days you'd save by skipping it.
SCOPE OF WORK
- Access dug on a schedule that protects the closing date
- Coordination with the licensed plumber or foundation crew
- A read on whether a flagged issue is structural or cosmetic
- Clean backfill and restoration before final walkthrough
- Photos and documentation for the transaction file
How every bore is held
Velocity, precision, OSHA, quality control, and the standards behind them.
Tunneling is the slow, risky part of a plumbing or foundation job. We run it like a discipline, not a dig.
Velocity
Hand-tunneling is the slow part of any plumbing or foundation job. We staff the bore to the schedule and hand over an open, ready trench instead of billable hours spent waiting on a shovel.
Precision
We dig to the plan. Depth, width and pitch are shot before the first spade and verified as we go, so the pipe run or the pier lands where the drawing says.
OSHA safety
Cave-in exposure is real. We work to OSHA Subpart P excavation practice: protective systems, safe access and egress, spoil set back from the edge, water and air managed, and daily competent-person inspection.
Quality control
Every bore is checked against the drawing for working width, clean floor and walls, and true pitch. Backfill goes in compacted lifts so the ground above settles right.
Standards & compliance
Texas 811 is called and lines are located before we dig. We sell the access, not the licensed pipe work. Permits, locates and clean documentation come standard.
Why a foundation crew digs a better tunnel
We come out of foundation repair, and we've dug alongside plumbers for years, so we know how to dig it.
We know how a sewer line runs under a slab, where the belly usually hides, and how much room it takes to set a fitting and lie down to make a joint. So we open the bore wider at the repair, shore it, keep it dry, light it, and get out of the way. Years of watching the pipe work happen is what tells us how wide to make it.
- We open the work area wider where the repair is, leaving room to set, slope, and joint
- Shored, dry, and lit so the plumber works in a tunnel, not a hole
- We dig it and back-fill it; your licensed plumber does the pipe work
From locate to backfill
How an under-slab tunnel runs.
Locate & plan
We call Texas 811, locate utilities, and shoot the depth, width, and pitch the repair needs before a spade hits the ground.
Open the entry
A compact entry pit goes in at the chosen point, usually outside the foundation, so the floors above stay whole.
Tunnel to the work
We hand-tunnel to the pipe run, pier location, or access point, widening the bore where the repair happens.
Shore & hand off
The bore is shored and inspected, then handed off open, dry, and workable to your licensed plumber, foundation crew, or engineer.
Backfill in lifts
Once the repair passes, we place backfill in compacted lifts so the slab, drive, or walk above settles correctly.
Clean & document
Spoil hauled, site restored, and the access and backfill documented for your file or warranty.
LICENSING & SAFE DIGGING
In Texas, plumbing repairs are regulated by the Texas State Board of Plumbing Examiners, which issues Tradesman, Journeyman, Master, and Inspector licenses. Motmot sells under-slab tunneling and access excavation, and partners with your licensed plumber for the pipe repair. Before any dig, Texas 811 is contacted at least two business days ahead so gas, water, and utility lines are located first.
Industry FAQ
Realtors & inspectors tunneling, questions answered.
From real jobs
What this access looks like on real jobs.



Tunneling for other industries
Plumbing companies
Under-slab tunneling for plumbers.
See plumbing companies tunneling →Foundation repair
Foundation repair tunneling.
See foundation repair tunneling →Structural engineers
Engineer-access excavation for under-slab evaluations.
See structural engineers tunneling →GCs & remodelers
Under-slab access for remodel plumbing.
See gcs & remodelers tunneling →Property mgmt & multifamily
Low-disruption under-slab tunnel access for rental and multifamily properties.
See property mgmt & multifamily tunneling →Investors & flippers
Pre-sale and investor property tunneling for plumbing/foundation access.
See investors & flippers tunneling →Restoration & insurance
Access excavation for slab leak and water-damage repairs.
See restoration & insurance tunneling →Commercial facilities
Commercial under-slab tunneling for plumbing and structural access.
See commercial facilities tunneling →Backfill & cleanup
Tunnel backfill and cleanup.
See backfill & cleanup tunneling →Need under-slab access? Tell us the run.
We'll scope the tunnel, dig it to plan, shore it, and back-fill it clean, so your licensed repair goes in smoothly and the floors above stay whole.
Now booking free inspections in Central Texas.
