For commercial facilities & operators

Commercial Under-Slab Tunneling for Plumbing & Structural Access

For a restaurant, a clinic, or a school, the repair bill is the small number. Closed doors is the big one. Interior demolition shuts the space. Tunneling from outside keeps the slab in service while the work happens underneath it.

Get a Tunneling Quote (210) 816-0034

Under-slab tunnel excavation at a commercial foundation, access without interior demolition.

A commercial slab has a schedule attached to it. Lunch service, clinic hours, a school day, a Sunday morning. When a line fails under that slab, tearing up the floor means picking a week to be closed. We tunnel the access instead, plan the dig around when the space is actually in use, and keep the entry off the path your customers walk in on. Where flatwork has to come out to reach the run, we put it back on a compacted subgrade so the lot doesn't tell the story a year later.

“Commercial under-slab tunneling for plumbing and structural access”“Low-downtime access for restaurants, clinics, schools, and retail”“Phased access excavation around operating hours”

When you call us

The jobs that need a tunnel.

Restaurant sewer or grease-line failure

A kitchen line fails and the floor can't come out during service. We tunnel from outside so the plumber works below the slab while the kitchen keeps running where it can.

Clinics and schools that can't close

Healthcare and education spaces can't take demolition during hours. We dig on a schedule set by the operating calendar.

Retail and office downtime

A torn-up sales floor is lost revenue and displaced staff. Tunneling keeps the space open.

Interior structural access

A commercial slab needs interior support or an engineer's look. We tunnel to it without demolishing the floor above.

Parking and drives you can't lose

Access sometimes crosses a lot or a drive lane. We phase it so you never lose the whole approach at once.

Phased work around operations

Big footprints need staged access. We sequence the dig so the business absorbs it.

What you get

How we work with you.

We plan the dig the way an operator would. Access points that don't block the entrance, zones fenced and signed to OSHA Subpart P, after-hours or phased digging where the business needs it, and backfill compacted in lifts so the floor slab, the drive, or the parking above it doesn't settle later. The licensed plumber owns the pipe repair and the engineer owns the structural call. We own getting them safe, workable access with the least interruption to trade. When you compare quotes, price the dig against a day of closed doors rather than against a residential tunnel. That comparison is the one an operator actually has to make, and it is usually the whole argument.

SCOPE OF WORK

Access dug below the slab with the business staying open where possible
Work phased around operating hours when needed
Fenced, signed, OSHA-compliant commercial work zones
Backfill and compaction so slabs, drives, and parking settle right
Flatwork replacement available for sections removed for access

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.

VEL

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.

PRC

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.

SAF

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.

STD

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

Commercial facilities tunneling, questions answered.

Can we stay open during the work?

On most jobs, at least partly. The dig and the repair happen below the slab from an exterior or contained entry, so the space above usually stays usable. For the most sensitive areas we phase the work or run it after hours.

Do you work after hours or in phases?

Yes, and commercial jobs often need it. We plan the access around your operating schedule with staged entry points, off-hours digging, and contained zones so customers and staff are never in the work area.

Who handles the plumbing and the structural call?

Your licensed plumber makes the pipe repair and a structural engineer makes any structural determination. Motmot provides the tunneling and access excavation that gets them to the work safely.

Will the parking lot or floor settle after backfill?

Not when it's compacted right. We backfill in lifts and compact so the slab, drive, or lot above the tunnel settles correctly. Where flatwork has to be removed for access, our concrete & flatwork crews replace it.

Is the dig safe in an occupied commercial building?

Yes. Fenced and signed work zones, OSHA Subpart P excavation practice, utility locates called first, and a daily competent-person inspection. Commercial safety expectations are built into the job.

From real jobs