Let Two Brothers Reach the Pipe Without Breaking Your Floors
Tunneling Under Slab in Houston, Texas
☼
Need Access Under Your Slab in the Houston Metro Area?
Has a plumber told you the broken line runs beneath your foundation? You have two choices. Break through the floor of your home, or reach the pipe from outside.
Tunneling under slab lets our crew hand-dig an access tunnel from your yard, work underneath the concrete, and leave your tile, hardwood, and cabinetry untouched.
So, what are you waiting for? Call us at 832-710-6957 and get your first consultation and estimate for free.
See more of our residential foundation repair services. We also offer commercial foundation repair services in the Greater Houston area.
Why Houston Homeowners Call Two Brothers
- 20+ years working in Houston's expansive clay
- A+ BBB accredited and fully insured
- Lifetime transferable warranty on slab and grade repairs
- Free written assessment, no obligation and no pressure
- Licensed structural engineers on the projects that need them
- Engineer sealed completion reports available
Prefer to write? Use the contact form and we will call you back.
When Do You Need Under-Slab Tunneling in Houston?
Most homeowners never think about foundation tunneling until a plumber hands them a camera report. Find your situation below and see what under slab tunneling solves.
Slab Leak Under a Load-Bearing Wall
The pipe sits under the strongest part of your slab. Cutting there weakens the structure exactly where it carries the most weight. Tunneling under slab reaches it from outside and leaves the concrete continuous.
Cracked and leaking foundation repair ›Sewer Line Replacement
Cast iron drain lines in older Houston homes corrode from the inside and separate at the joints. Replacing the full run means reaching all of it, not one spot, and that is a job foundation tunneling is built for.
Foundation drainage solutions ›Whole House Repiping
When the original supply lines have failed in three places, they will fail in a fourth. At that point spot repairs cost more than full access, and an under-slab tunnel gives your plumber the whole run at once.
Residential foundation repair ›Interior Pier Access
Some settlement patterns need piers set beneath the middle of the slab, not just the perimeter. Tunneling under slab creates the working room to place them without opening your floor.
House leveling and lifting ›Finished Interiors Worth Protecting
Tile, hardwood, stained concrete, and custom cabinetry are expensive to replace and often impossible to match. On finished homes, under slab tunneling frequently costs less overall than breaking through and rebuilding.
Concrete slab foundation repair ›Occupied Homes and Businesses
Restaurants, retail, apartments, and families who cannot relocate. Because tunneling under slab happens outside, the household keeps living there and the business keeps trading.
Commercial foundation repair ›Not sure which applies to you? A free assessment answers it in writing.
Call 832-710-6957What Is Tunneling Under Slab?
Tunneling under slab is the process of hand-digging an access tunnel from outside your home, running beneath the foundation, to reach plumbing lines or structural elements buried under the concrete. Instead of cutting through the slab from above, our crew excavates from the exterior and works underneath.
The tunnel is dug by hand, not by machine. Crews shore the walls as they go and stop short of anything that would undermine the load-bearing sections of your foundation. When the work is finished, the tunnel is backfilled in compacted lifts so the soil beneath your home returns to proper density.
Every under slab tunneling job is backed by our lifetime transferable warranty.
Tunneling vs Breaking the Slab
Both methods work. The right one depends on where the pipe sits, what your floors are made of, and whether anyone needs to live in the house while the work happens.
| Factor | Tunneling Under Slab | Breaking Through the Slab |
|---|---|---|
| Where the work happens | Outside the home | Inside, through your floors |
| Flooring impact | None | Flooring in the work zone is removed |
| Can you stay in the home | Usually yes | Often no |
| Dust and debris inside | Minimal | Significant |
| Foundation integrity | Slab is left intact | Slab is cut and patched |
| Landscaping impact | Excavation at the entry point | None |
| Best for | Load-bearing areas, finished interiors, long pipe runs, occupied properties | Short runs, unfinished floors, pipes near the perimeter |
A cut slab is never as strong as an uncut slab. That matters in Houston, where the ground moves every season. Keeping the concrete continuous is the main structural argument for foundation tunneling.
Our Tunneling Under Slab Process
Free On-Site Assessment
We come out, review the plumber's findings, locate the line, and evaluate the foundation above it. You get a written proposal with no obligation.
Tunnel Planning and Layout
We map the shortest safe route to the work area, staying clear of footings and load-bearing sections. Entry point placement accounts for your landscaping, driveway, and utilities.
Hand Excavation
Crews dig by hand and shore as they advance. Excavated soil is stockpiled on site for backfill, and tunnels are sized for safe working access.
Plumbing or Foundation Work
Your plumber completes the repair with full access to the line, or our crew performs the foundation work the tunnel was dug to reach.
Backfill and Compaction
Soil goes back in compacted lifts, not dumped and left to settle. Improper backfill creates voids, and voids under a slab cause the exact settlement problems you were trying to avoid.
Restoration and Follow-Up
We restore the entry area and return to confirm everything is performing as expected. Read more about our process and the foundation repair methods we use.
Five Myths About Tunneling Under a House
There is a lot of confident misinformation about under slab tunneling in Houston. Here is what holds up.
Tunneling under a house is always more expensive than cutting the slab
The tunneling line item is often higher. The total frequently is not. Breaking through means demolition, slab patching, flooring removal and replacement, interior cleanup, and sometimes a hotel. On a home with tile, hardwood, or stained concrete, foundation tunneling regularly comes out cheaper once everything is counted. Where it is true: on homes with inexpensive or unfinished floors, breaking through usually does cost less overall.
Tunneling weakens your foundation
Done correctly it does the opposite of the alternative. Tunnels are routed to avoid undermining load-bearing sections, shored as they advance, and backfilled in compacted lifts. Cutting the slab, by contrast, permanently interrupts the concrete. A patched slab is never as strong as an uncut one. The real risk: not the tunnel, but lazy backfill. See our backfill and compaction section above.
Insurance companies prefer tunneling
Insurers prefer whichever option costs them least, and that varies job to job. Neither method is automatically favored. What actually affects a claim is whether the water damage came from a sudden covered event and how well the cause is documented. What helps: a written assessment and clear documentation of the cause, which we provide.
Any excavation crew can dig an under-slab tunnel
Digging is the easy part. Routing a tunnel so it does not undermine footings, shoring it safely in saturated Houston clay, and restoring soil density afterward are foundation problems, not digging problems. The consequences of getting them wrong show up years later as settlement. Ask any contractor: how do you backfill, and is that work warrantied?
The tunnel is wasted work once the pipe is fixed
Not necessarily. A properly routed and documented access tunnel maps a path under your home that can serve future inspections, warranty work, or additional repairs. On homes likely to need further plumbing or foundation attention, that is a one-time cost with a long tail of value. Worth noting: our lifetime transferable warranty covers the foundation work either way.
The Part Most Companies Skip: Backfill and Compaction
Anyone with a shovel can dig a tunnel. What separates a good tunnel job from one that costs you a foundation repair in five years is how the tunnel gets filled back in.
When soil is excavated, it loses the density it spent decades developing under the weight of your house. If that soil is simply pushed back into the hole and left to settle on its own, it compresses unevenly under load. Voids form. Your slab loses uniform support in exactly the area someone just paid to repair.
We backfill in compacted lifts. Soil goes back in measured layers, each one mechanically compacted before the next is added, so the ground beneath your slab returns to something close to its original density rather than settling on its own schedule.
This is the reason we treat tunneling as foundation work. A plumbing contractor's job ends when the pipe is fixed. Ours ends when the soil under your home is carrying load properly again, and that work is covered by the same lifetime transferable warranty as our pier work.
Under-Slab Tunnel Specifications
What an access tunnel beneath a Houston slab foundation actually looks like. Final dimensions are set during your free assessment, based on your foundation depth and the work required.
| Specification | Typical Range | What Determines It |
|---|---|---|
| Excavation method | Hand dug | Machine excavation cannot work safely beneath a slab |
| Tunnel depth | Roughly 3 to 6 feet | Foundation depth and the depth of the line being reached |
| Cross section | Sized for safe worker access | Crew must be able to work and exit safely |
| Tunnel length | Set by the job | Distance from the exterior entry point to the work area |
| Wall support | Shored as excavation advances | Soil type, moisture content, and tunnel length |
| Entry point | Exterior, outside the footprint | Routed around footings, utilities, driveways, and landscaping |
| Backfill method | Compacted lifts | Never loose fill, which creates voids under the slab |
| Spoil handling | Stockpiled on site | Excavated soil is reused for backfill where suitable |
Why Houston Homes Need Tunneling More Than Most
Houston sits on expansive clay. The soil swells when it rains and shrinks when it dries, and it does both hard. That cycle moves foundations, and moving foundations put stress on the rigid pipes running underneath them.
Cast iron and clay drain lines in homes built before the 1980s were not designed for decades of that movement. They crack at the joints, separate at the connections, and corrode from the inside. When they fail, the leaking water saturates the clay directly beneath your slab, which swells that section, which stresses the foundation further. The plumbing problem becomes a foundation problem.
This is why we treat under slab tunneling as foundation work and not just as plumbing access. Our crew looks at what the leak has already done to the soil and the slab above it, not only at the pipe.
Poor drainage makes all of it worse. If water is pooling against your foundation, our foundation drainage solutions address the cause instead of the symptom.
Signs You May Have a Slab Leak
- A water bill that climbed with no change in usage
- The sound of running water when everything is turned off
- Warm or hot spots on the floor
- Damp carpet, buckling wood, or lifting tile
- A musty smell that will not go away
- Cracks appearing in walls or floors
- New settling or unevenness in one section of the house
Several of these overlap with foundation movement. If you are seeing cracks alongside moisture, our cracked and leaking foundation repair page covers what that combination usually means.
How Tunneling Is Priced
Under-slab tunneling is priced per linear foot, not as a flat job rate. That is why nobody in Houston can quote you honestly over the phone without knowing where you live and how far the tunnel has to run.
The per-foot rate itself shifts across the metro, because soil digs at very different speeds. Dense, tight clay takes longer per foot than looser sandy soil, and areas with a high water table need more shoring and more time. Two identical tunnel lengths in different parts of Houston are not the same job.
On top of the per-foot rate, these factors move the total:
- Total tunnel length from entry point to work area
- Depth required, set by your foundation and the line
- Number of separate access points needed
- Obstructions such as driveways, patios, and mature roots
- Scope of the repair, spot fix versus full replacement
- Surface restoration required at the entry point
Longer runs sometimes earn a better rate per foot. Tell us your neighborhood and what your plumber found, and we will give you a written figure. Every estimate is free. If financing would help, we offer payment plans.
Residential and Commercial Under-Slab Tunneling
Left unaddressed, the movement a leaking under-slab line causes shows up in the walls above it. We provide tunneling under slab for both property types.
Residential
Single family homes, townhomes, and additions where the goal is reaching the line without tearing up finished living space. See our full range of residential foundation repair services, or our concrete slab foundation repair for damage above the tunnel line.
Commercial
Office buildings, retail, apartment complexes, restaurants, and institutional properties where closing the building is not an option. Learn more about our commercial foundation repair work.
Six Questions to Ask Before You Hire a Tunneling Contractor
Under slab tunneling in Houston is not a licensed specialty, which means quality varies more than price does. These questions separate the crews worth hiring.
How do you backfill the tunnel?
The answer you want is compacted lifts, meaning measured layers each compacted before the next goes in. If the answer is vague, or amounts to putting the dirt back, walk away. Improper compaction is the number one cause of settlement after a tunnel job.
Is the backfill warrantied, or only the dig?
Plenty of crews warranty the excavation and nothing else. If the soil under your slab settles in three years, you want that covered. Our foundation work carries a lifetime transferable warranty.
Are you a foundation company or a digging company?
A digging crew's job ends when the plumber can reach the pipe. A foundation company's job ends when your slab is properly supported again. Those are different finish lines, and only one of them protects your house.
How do you route the tunnel around footings?
You want to hear about planning the path before digging starts, keeping clear of load-bearing sections, and accounting for utilities. If the plan is to dig toward the pipe and figure it out, that is a problem.
Is the quote per foot, and what is included?
Tunneling is priced per linear foot. A flat number quoted over the phone without knowing your neighborhood or tunnel length is a number that will change. Get it in writing, with restoration specified.
Are you insured, and will you document the work?
Excavation beneath an occupied home carries real liability. Confirm insurance, and ask whether you will receive documentation, including engineer sealed completion reports where the scope calls for them.
We are happy to answer all six on the phone before you book anything.
Call 832-710-6957For Plumbers, Contractors, and Property Managers
Not every job that needs a tunnel comes from a homeowner. If you are the one who found the problem, we are the crew that gets you to it.
We dig, shore, and secure the access tunnel, then backfill in compacted lifts and restore the entry point once you are finished. You do the plumbing. We do the ground.
We work regularly with licensed plumbers, repipe specialists, electricians, general contractors, remodelers, and property managers across the Greater Houston area.
- We schedule around your crew. The tunnel is open and ready when your team arrives, so nobody stands in a yard waiting.
- We do not compete with you. We are a foundation company. We will not quote your customer on the plumbing.
- We carry the backfill liability. Improper compaction is what turns a plumbing job into a foundation callback. That risk sits with us, warrantied.
- We work on occupied properties. Apartments, retail, and restaurants where the building cannot close.
Two Bros Foundation Repair Service Areas
Professional under-slab tunneling services available across the Greater Houston area. Click any location to learn more about our foundation repair services in that area.
- Houston
- Sugar Land
- Katy
- Pearland
- League City
- Spring
- The Woodlands
- Conroe
- Cypress
- Tomball
- Humble
- Kingwood
- Friendswood
- Missouri City
- Pasadena
- Baytown
- Clear Lake
Client Testimonials: What Our Customers Are Saying
Good experience with Two Brothers Foundation repair! The team was very professional and very polite. They answered all my questions, and the working crew did a good job cleaning up the dirt that was dug out. I'd definitely recommend them to anyone asking for a good, reputable foundation repair company!
I had Two Brothers repair my home's foundation back in 2018, and it has had no problems since, now 7 years later. They were quick to answer even now as I look to sell the property and transfer the service. Would recommend to anyone who needs their foundation repaired.
Aaron & Jacob were very professional and walked me through the entire process. They made sure I was informed at each step and made sure they left the work area in an excellent condition when completed. Glad to be back on a level foundation again.
Related Foundation Services in Houston
Under-slab tunneling rarely happens on its own. These are the services most often needed alongside it.
Concrete Slab Foundation Repair
If the leak or the movement has already cracked or settled your slab, the structural repair happens above the tunnel line.
Learn more ›Structural Foundation Assessments
Free elevation survey and written report telling you whether you have a plumbing problem, a foundation problem, or both.
Learn more ›Foundation Drainage Solutions
A repaired pipe stops one water source. Poor exterior drainage never stops, and it will move your foundation again.
Learn more ›House Leveling and Lifting
Where settlement has already occurred, pressed pilings bring the slab back to elevation and hold it there.
Learn more ›Cracked and Leaking Foundation Repair
Sealing and reinforcing damaged areas so moisture stops spreading and the foundation stabilizes.
Learn more ›Commercial Foundation Repair
Tunneling and structural repair for apartments, retail, restaurants, and institutional buildings that cannot close.
Learn more ›Frequently Asked Questions (FAQs)
Still have questions about tunneling under slab? See some of our frequently asked questions below or contact us today.
How long does tunneling under a slab take?
Tunnel excavation typically takes a few days depending on length, depth, and soil conditions. The plumbing or foundation repair happens after the tunnel is open, and backfill follows that. Your written proposal includes a timeline for your specific job.
Can I stay in my home during under-slab tunneling?
In most cases yes, and that is one of the main reasons homeowners choose it. The excavation happens outside, so your floors stay intact and your water service is only interrupted during the actual plumbing repair.
Is tunneling under slab safe for my foundation?
Yes, when it is done correctly. Tunnels are routed to avoid undermining load-bearing sections, walls are shored during excavation, and the tunnel is backfilled in compacted lifts. Poor compaction is what causes problems later, which is why we do not rush that step.
Is tunneling cheaper than breaking the slab?
Not always on the invoice, but often on the total. Breaking through means demolition, patching, and replacing flooring, and it may mean living elsewhere during the work. Tunneling under slab avoids those costs. We give you both options in writing so you can compare.
Will tunneling damage my yard or landscaping?
There will be excavation at the entry point. We plan the location to limit the impact and restore the area when the work is done, but we cannot guarantee plants in the immediate work zone. If you have valuable landscaping there, we recommend relocating it beforehand.
Who does the actual plumbing repair?
We dig and secure the tunnel, then backfill and restore. Your licensed plumber performs the plumbing repair itself. We coordinate scheduling directly with them so there is no waiting.
Does homeowners insurance cover under-slab tunneling?
Coverage varies. Damage from a sudden covered event such as a burst pipe is more likely to be covered than gradual deterioration or soil movement. Review your policy, and we can provide documentation to support your claim where it applies.
How do I know if I need tunneling or interior access?
It depends on where the line sits and what your floors are made of. Pipes near the perimeter under unfinished floors may be easier to reach from inside. Lines under load-bearing walls or finished living space usually call for tunneling. Our free assessment gives you a direct recommendation.
How is under-slab tunneling priced?
Tunneling is priced per linear foot rather than as a flat job rate, and the per-foot rate varies across Houston because soil digs at different speeds. Dense clay takes longer than sandy soil, and a high water table means more shoring. Length, depth, obstructions, and restoration also affect the total. Longer runs sometimes earn a better rate per foot.
What happens to the tunnel after the repair is finished?
The tunnel is backfilled in compacted lifts, meaning soil goes back in measured layers with each one mechanically compacted before the next. This restores the density the soil lost during excavation. Loose fill left to settle on its own creates voids beneath the slab, which is what causes settlement problems years later.
Do you work with plumbers and contractors, or only homeowners?
Both. We regularly provide tunneling for licensed plumbers, repipe specialists, electricians, general contractors, and property managers. We dig, shore, backfill, and restore. Your crew does the repair. We do not quote your customer on plumbing work.
Do you offer free estimates for foundation tunneling?
Yes. Assessments and written estimates are free with no obligation, across Houston and the surrounding area. Call 832-710-6957 to schedule.
Still have questions?
Still have questions about residential or commercial under-slab tunneling? Give us a call or fill out the form on our contact page.
Contact us