Helical Pier
Foundation
Stabilization

A helical pier is a steel shaft with one or more helical flights — think of a large screw — that is hydraulically driven into the ground beneath a failing foundation. The helix flights cut through unstable surface soils as the pier advances, and the shaft continues until it reaches load-bearing soil or bedrock below the frost line. Once there, the pier is connected to the foundation wall through a steel bracket, transferring the load of the structure from the failing shallow soil to the stable deep soil.

The mechanics are fundamentally different from surface-level repairs. Crack repair, drainage, and wall reinforcement address symptoms at or near the foundation surface. Helical piers address the root cause of settlement — the soil beneath the foundation is no longer supporting the structure's weight. Until that load path is corrected, surface repairs cannot stop the settling.

Maryland's clay soils are prone to two types of movement that cause foundation settlement: consolidation under load over time, and shrink-swell cycling driven by moisture changes. Homes built before the 1980s often sit on shallower footings that did not anticipate the long-term settlement behavior of Maryland's Piedmont clay. When those footings drop, doors stick, floors slope, and cracks appear — often stair-step cracks in block or diagonal cracks in poured concrete near window openings.

Depth depends on local soil conditions — specifically, where load-bearing strata exist below your site. In central Maryland, this is typically 15 to 35 feet below grade, though it varies significantly by location. The pier installation is torque-monitored: as the pier advances, we track installation torque, which correlates to soil bearing capacity. The pier is advanced until the torque reading indicates it has reached competent soil.

On the question of lifting: yes, in many cases helical piers can restore some or all of the foundation's original elevation. Once piers are installed and connected to the foundation bracket, hydraulic pressure is applied through a manifold system to incrementally lift the structure. This is called the lift phase. The amount of lift achievable depends on how long settlement has been occurring, whether the structure has adjusted to the settled position, and whether plumbing or utilities would be affected by lifting.

OBW will be honest with you about lift expectations during the assessment. In some cases — particularly with older structures that have settled gradually over decades — attempting a full return to original elevation can cause more damage than stabilizing at the current position. We will recommend the approach that serves the structure's integrity, not the most dramatic-sounding outcome.

Helical pier installation is the most capital-intensive of the foundation repair services OBW offers. Individual pier installation typically runs $800 to $2,000 per pier depending on depth required, soil conditions, and the bracket configuration needed for your foundation type. Most residential foundation stabilization projects require eight to twelve piers, placing total project costs in the $8,000 to $20,000 range.

The wide range reflects genuine variability in what the work actually requires. A pier driven 18 feet to competent soil costs less than a pier driven 30 feet through deep clay to bedrock. A simple bracket on a poured concrete footing costs less than a customized bracket on a deteriorating block wall. You cannot get an honest pier quote without a site visit and soil assessment.

For context: the cost of helical piers is significant but should be compared to the alternative — continued settlement that can eventually result in structural wall failure, floor system damage, and potentially uninhabitable conditions. Early intervention with piers is considerably less expensive than addressing a foundation that has failed completely.

No. Helical pier installation is a below-grade operation. The work happens outside the house — around the perimeter of the foundation — or in the crawl space or basement where access to the footing is required. Most homeowners remain in their homes throughout the installation with normal use of all floors.

The equipment produces noise and some vibration. The hydraulic driver used to advance the piers creates a rhythmic mechanical sound as each pier is installed. This is notable but not disruptive to normal daily activity. Pier installation typically runs one to two days depending on the number of piers and site access conditions.

One exception: if piers need to be installed from inside the basement or crawl space and you have finished spaces directly above those areas, you may want to clear those rooms of fragile items during the lift phase, when controlled hydraulic pressure is applied to the structure. We will walk you through any specific precautions before work begins.

OBW is expanding into pier and underpinning work after decades of mastering Maryland basement waterproofing. We want to be straightforward about that: pier installation is a newer addition to our service lineup, not a 50-year track record. What we bring to this work is the same family ownership, the same English-speaking crew, the same no-subcontracting commitment, and the same Lifetime Transferable Warranty that covers every OBW repair.

We source helical piers from commercial suppliers — not a proprietary franchise system. The bracket and shaft specifications are commercial-grade and meet accepted engineering standards for residential underpinning. We engage a licensed structural engineer where the scope of settlement or the structural conditions warrant an independent engineering review.

If your settlement situation is complex — significant differential settlement across multiple corners, structural compromise of the foundation wall alongside settlement, or commercial-scale loading — we will tell you honestly whether OBW is the right contractor for that specific scope or whether you need a firm with deeper underpinning specialization.