Foundation Underpinning: Transferring Your Home's Weight to Stable Soil
When the soil near the surface can no longer carry your foundation, underpinning reaches deeper ground to stabilize the structure. Serving homeowners across North and South Carolina.
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What to Know About Foundation Underpinning
Underpinning works on a simple idea: if the soil near the surface can no longer carry the foundation, the load moves down to soil or bedrock that can. The method depends on the home and the soil, which the inspection determines.
Most residential underpinning in the Carolinas uses steel piers under the existing footing. Piers pressed down by hydraulic rams travel through weak surface soil to a deeper layer that can support the structure. Steel piers with screw shaped plates are turned in like a large auger and often suit lighter loads or sites where driving resistance is a factor. Brackets connect the piers to the footing and shift the weight onto them.
Where the structure allows, the piers can also lift the foundation back toward its original height, which can help close cracks at door frames and corners. Underpinning stabilizes the home by bypassing the soil that failed. It does not change how water reaches the foundation, so the inspection looks at water too and we explain what we find alongside the structural plan.
The symptoms that usually lead to foundation underpinning are on the foundation repair problem signs page, alongside the other signs that point to the same underlying cause.
How We Underpin a Foundation
Free Inspection and Diagnosis
We start by confirming whether the foundation has actually settled and why. We measure floor heights across the home, look at crack patterns and gaps opening around windows and doors, and check how water reaches the footing. In Piedmont clay or Sandhills sandy soil, the cause of the movement shapes the recommendation, and we will tell you plainly if underpinning is not needed for your home.
Plan the Pier Layout
If underpinning is the right solution, we choose the type of pier, the spacing, and the target depth based on the load of the home and the depth to firmer soil. The plan is built for your structure and soil, and we walk you through it before any work begins.
Expose the Footing and Set Brackets
Our crew carefully digs access points at each pier location and prepares the footing so a bracket can be secured to it. The work is staged around the home so the structure stays supported throughout, and digging is kept to what the plan requires.
Install Piers to Firmer Soil
Each pier is driven or screwed down under the sunken section of foundation, through the weak soil near the surface, until it reaches a deeper layer that can carry the load. We watch resistance as the piers advance to confirm they have reached firm soil.
Transfer the Load and Stabilize
Once the piers reach capacity, the weight of the home is transferred from the unstable shallow soil onto the piers through the brackets. Where the structure allows, we can also lift the foundation back toward level, which can help narrow gaps where walls meet the ceiling, then check that the home is stable.
Backfill, Clean up, and Review
We backfill the access points, restore the work areas, and review the completed stabilization with you, including what the inspection found about how water reaches the foundation.
Photos From Our Work
Foundation Underpinning on Our Job Sites
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Care and Expertise From a Team Serving the Carolinas Since 2017
When the fix is foundation underpinning, our own crews do the work. HydroHelp911 handles foundation repair and related structural and moisture work across North and South Carolina.
An inspector looks at your home, finds the source of the problem, and explains each finding in plain language. There is no obligation.
We are headquartered in Dallas, North Carolina, with eight offices across North and South Carolina.
Foundation repair, crawl space repair and encapsulation, basement waterproofing, framing repair, and concrete leveling are the whole focus of the team.
We have 1,300+ verified Google reviews (4.9 stars) from homeowners across the Carolinas and are BBB A+ Accredited.
For example, helical and push piers carry a lifetime warranty that no additional settlement will occur in the area of installed piers, once the final invoice is paid in full. Read the warranty terms.
Ask your inspector about financing when you get your written estimate. See financing options.
Common Questions About Foundation Underpinning
Don't see your question here? Call or fill out our quick online form, and our team will help.
Foundation underpinning is a structural repair that stabilizes a settled foundation by transferring its load to deeper, firmer soil. When the shallow soil beneath a footing shifts or loses strength, piers are installed down to a stronger layer, and the weight of the home is carried by those piers. It is one of the main ways a sinking or shifting foundation is supported.
Which Foundation Repair Problem Signs Can Foundation Underpinning Help With?
A sign can trace to more than one cause. These are the foundation repair signs that can point to a cause this method addresses; the inspection shows which cause is at work in your home.
Foundation Settlement
When part of your home drops because the soil beneath it has moved or compressed, the symptoms show up as cracks, sticking doors, and uneven floors.
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Stair Step Cracks
When cracks climb diagonally along the mortar joints of a brick or block wall, the masonry may be showing you that one part of the foundation has shifted.
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Diagonal Cracks
A crack running on an angle out of a doorway corner, across a wall, or up through brick is one of the clearer signs that a foundation has shifted.
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Sticking Doors and Windows
A door that suddenly drags or a window that won't slide is often the first thing homeowners notice when a foundation moves.
Learn MoreSinking Foundation
When part of your home is dropping because the soil beneath it can no longer hold the load, the signs show up as cracks, sticking doors, and floors that pull away from level.
Learn MoreLeaning Chimneys
When a chimney starts to tilt or pull away from the house, the cause is often below the masonry, in the footing underneath it.
Learn MoreOther Foundation Repair Solutions We Install
Each solution fits a different cause. The inspection shows which one your home needs.
Carbon Fiber Reinforcement
When soil and water pressure starts pushing a foundation wall inward, carbon fiber straps bond to the wall and resist that load, a slim repair for minor to moderate bowing.
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Epoxy or Polyurethane Crack Injection
A targeted way to seal cracks in poured concrete foundation walls and stop water seepage, paired with a careful look at what caused the crack in the first place.
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Helical Piers
Steel piers shaped like large screws, turned down below the active surface soil to support and, where possible, lift a settling foundation.
Learn More
I-Beam Wall Bracing
When clay or saturated soil presses a foundation wall inward, steel I-beams brace it from the inside and stop further movement.
Learn MoreDeep Foundation Systems
When the soil near the surface keeps moving, we install piers that carry your home's weight down to ground that holds, and only after a free inspection.
Learn MoreGrout Injection (Chemical Grouting)
A targeted way to fill voids and firm up weak or shifting soil under foundations and slabs, so settlement has less room to continue.
Learn MoreGuides and Answers
A Guide About Foundation Underpinning
An article from our team that goes deeper on this topic.
Foundation Repair
Helical Pier Underpinning Costs
The cost of underpinning with helical piers depends on how many piers the home needs, their length, the soil and access.
Get the Free Foundation Repair Guide
A free guide for homes in North and South Carolina: what can move a foundation here, the signs worth writing down, and how foundation repairs work, in plain language.
- A room by room checklist to walk your home with
- Why foundations move in Piedmont clay, on hillsides and near the coast
- How piers, wall anchors and other repairs work
- Five questions worth asking any contractor, including us
1,300+ Verified Google Reviews (4.9 Stars)
Before you choose a contractor for foundation underpinning, read how homeowners across North Carolina and South Carolina rate our work.
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