Most yard sinkholes are fixable with the right material and method. But filling one without identifying the cause first is how you end up filling the same hole three times. After delivering over a million yards of dirt across DFW and Denver, we have seen every type of sinkhole a residential yard can produce. Here is what actually works.
What Causes Yard Sinkholes
Before you order a single yard of material, figure out why the hole appeared. There are four common causes, and each one changes your repair strategy.
Surface Erosion
Water runoff carves a channel, washes away loose soil, and leaves a depression. Common in North Texas after heavy spring rains hit exposed clay. These are usually shallow (under 12 inches), wide, and appear along drainage paths or at the base of slopes. Easiest to fix.
Buried Pipe or Utility Failure
A broken sewer line, collapsed French drain, or cracked irrigation pipe creates a void underground. Water erodes the soil around the break, and the surface eventually drops. The telltale sign: the sinkhole keeps getting worse, the soil around it stays wet even in dry weather, or you smell sewage. Do not fill this until the pipe is repaired. You will waste every dollar you spend on dirt.
Organic Decomposition
A buried tree stump, construction debris with wood, or old root system rots over years and leaves a void. Very common in DFW neighborhoods built in the 2000s where builders buried clearing debris instead of hauling it off. These sinkholes appear suddenly, often 10 to 15 years after construction.
Settling Fill from Original Construction
The builder backfilled around the foundation, patio, or driveway with loose dirt that was never compacted. Over time it consolidates, especially through North Texas wet-dry cycles or Denver freeze-thaw seasons. You get a trough running parallel to the foundation or a depression next to the driveway. Very common and very fixable.
When to DIY vs. Call a Professional
You can safely handle a sinkhole yourself if all four of these are true:
- The hole is less than 3 feet deep and less than 6 feet across
- It is more than 10 feet from your foundation
- There are no utility lines in the area (call 811 before you dig)
- The hole is not recurring — this is the first time it has appeared
Call a professional if the sinkhole is deeper than 3 feet, keeps coming back after filling, sits within 10 feet of your foundation, shows signs of a broken pipe (wet soil, odor, gurgling sounds), or is actively growing. A structural engineer costs $300 to $500 for an inspection. That is cheap compared to filling a hole four times because you skipped the diagnosis.
Step-by-Step Sinkhole Repair
Step 1: Excavate the Loose Material
Remove all loose, spongy, or organic soil from the hole. Dig down until you hit firm, undisturbed ground. In DFW, that usually means you reach solid clay. In Denver, you will often hit compacted sandy gravel. If you pull out rotted wood, old roots, or construction debris, keep digging until it is all out. Leaving organic material in the hole guarantees future settling.
Step 2: Inspect for Pipes and Voids
With the loose material cleared, look for utility lines, broken pipes, or underground voids that extend beyond the visible hole. Probe the sidewalls with a metal rod. If you punch through into soft soil or open space, the problem is bigger than it looks. This is where most DIY repairs go wrong — people fill what they can see without checking what they cannot.
Step 3: Pack Gravel at the Bottom
Lay 4 to 6 inches of clean gravel (3/4-inch crushed stone) at the bottom of the excavation. This creates a drainage layer that prevents water from pooling at the base and re-eroding your fill. Skip the gravel if you are filling a shallow erosion depression under 12 inches deep.
Step 4: Fill with Structural Fill in Lifts
This is the step most people get wrong. Do not dump regular fill dirt into the hole and call it done. Use structural fill and place it in 6-inch lifts. Add 6 inches, compact it with a hand tamper or plate compactor, then add the next 6 inches. Each lift should be compacted until it feels solid under your feet — no spring, no give.
Structural fill holds its density and resists settling because it is a controlled blend of sand, clay, and aggregate. Regular fill dirt will compact unevenly, hold water in DFW clay conditions, and settle again within a year. We price structural fill at $20 per yard in DFW and $25 per yard in Denver. It costs more than standard fill dirt, but for sinkhole repair, it is the only material that stays put.
Step 5: Cap with Topsoil
Once your structural fill is within 4 inches of grade, cap the repair with topsoil. Crown it slightly — build it about 2 inches above the surrounding grade. It will settle that much over the first few weeks, especially after the first good rain. Our topsoil runs $17 per yard in DFW and $22 per yard in Denver. Seed or sod the surface within a week to prevent erosion from undoing your work.
Material Selection: What to Use and What to Avoid
For sinkholes deeper than 12 inches, the right combination is gravel at the bottom, structural fill for the body, and topsoil for the cap. Do not use regular fill dirt ($10 per yard in DFW, $15 per yard in Denver) for recurring sinkholes or any hole deeper than 2 feet. It lacks the engineered density to resist re-settling.
Never use pure sand. It migrates through clay soil and creates new voids. Never use construction debris, broken concrete, or random rocks. They leave air gaps that collect water and cause future collapse. We have pulled out everything from old tires to mattress springs from sinkholes that homeowners "filled" with whatever was lying around.
How Much Material You Need
Measure the length, width, and depth of the excavated hole in feet. Multiply all three and divide by 27 to get cubic yards. Add 15 percent for compaction loss. A typical yard sinkhole measuring 4 feet by 4 feet by 3 feet deep needs about 2 cubic yards of structural fill plus a half yard of topsoil. Use our free calculator to get an exact number.
Our minimum delivery is 10 yards, so if your sinkhole only needs 3 yards, consider grading other low spots in your yard at the same time. A tandem truck carries 10 yards, and a tri-axle carries 16 yards. All prices include delivery with no hidden fees.
Cost Estimates for Sinkhole Repair
A small sinkhole (under 3 feet deep, under 5 feet across) typically requires 2 to 4 yards of structural fill and a half yard of topsoil. In DFW, that runs $40 to $80 for structural fill plus about $9 for topsoil, delivered. In Denver, the same repair costs $50 to $100 for structural fill plus $11 for topsoil. Add $50 to $80 if you need to rent a plate compactor for the day.
A medium sinkhole (3 feet deep, 6 to 8 feet across) might need 6 to 10 yards of structural fill. In DFW that is $120 to $200 for the fill alone. Still far less than the $1,500 to $3,000 a landscaping company will charge for the same repair.
Preventing Future Sinkholes
Grade your yard so water flows away from filled areas. Extend downspouts at least 4 feet from the foundation. In DFW, check filled areas after every heavy rain for the first six months — Texas clay soil expands and contracts with moisture, and new fill needs time to bond with the surrounding ground. In Denver, watch for settling after the first freeze-thaw cycle in fall. Keep gutters clean so roof runoff does not concentrate in one spot and carve new problems.
If you have a sinkhole that needs filling, text us at (469) 523-6420 with the dimensions and a photo. We deliver same-day on orders placed before 10 AM, Monday through Saturday, 7 AM to 5 PM. We will help you pick the right material so you only fill it once.