Helical Piers vs Push Piers: Which Fits Your Sinking House?

Price won't decide this one. What decides it is whether your house weighs enough to drive a push pier to a stable layer, or whether the job needs a pier that screws itself into the ground. Per pier, the two usually price within a few hundred dollars of each other. Fit is where you win or lose.

How do helical piers and push piers work?

Both carry your foundation's weight past weak, shallow soil to stronger ground far below, using steel shafts tied to a steel bracket under the footing.

Push piers (also called resistance piers) are steel tubes that a hydraulic ram presses into the ground one section at a time. The ram pushes against the weight of your house, so the house is the reaction force. The installer stops when the tube meets resistance above the load it must carry. Then the bracket picks up the load, and the piers can lift the wall back toward level.

Helical piers look like oversized screws: a steel shaft with one or more round helix plates welded on. A hydraulic drive head turns them into the soil, and the installation torque gives the installer a running estimate of capacity. They don't need the building's weight to go down. That's the biggest practical difference between the two.

Helical piers vs push piers: how do they compare side by side?

Helical piers and push piers cost about the same per pier, so the real differences are how they're driven, what they need from the house, and how capacity gets checked.

Depths vary a lot by region. Treat these ranges as starting points, then ask local installers what they actually hit on nearby jobs.

Where do helical piers win?

Helical piers win on lighter structures, on jobs where you want a measurable capacity number, and anywhere uplift is a concern.

Start with weight. A porch, sunroom, chimney, or lightly framed addition may not weigh enough to push a tube to depth, and a pier that stops early isn't carrying anything useful. Helical piers screw in under their own power, so they work where the structure can't supply the force.

Then there's verification. The torque reading gives you and the engineer a number tied to the soil the helices are bearing in, which makes capacity less of a judgment call. Helical shafts can also be designed to resist upward pull, something a smooth push tube isn't built for.

Where do push piers win?

Push piers win on heavy, load-bearing walls when stable soil or rock sits deep, because the tubes go in as short sections and can keep going past the depth where a helical pier gets impractical.

A two-story house with masonry veneer gives the ram plenty of weight to push against, and a smooth tube generally passes through soft soil more easily than a plated shaft. The installer also watches the hydraulic force reading until the target load is met, so there's a check built into the process. Ask each bidder which system their crew installs most often. Experience in your local soil counts for a lot.

How do soil type and depth to stable ground change the choice?

Depth to stable ground matters more than any other factor, because either pier only works if it ends in soil or rock that won't move.

In expansive clay, the top several feet swell and shrink with moisture. Piers must bottom out well below that zone, and swelling soil can grip a shaft and pull it upward. That's why helical piers often get the nod in clay under lighter structures: the shaft can be designed for tension. Under a heavy house, the building's own weight generally holds push piers down, and the question becomes whether stable ground is reachable.

With fill, organic soil, or very soft layers, a slender shaft may need sleeving or a larger diameter so it doesn't buckle. That's an engineering call, not a sales-pitch one. Ask each contractor what depth they reached on recent jobs within a few miles. If stable bearing is 30 feet down, a push system is often the practical answer. If it's 12 feet down, either can work.

What drives the cost difference between the two?

Pier count, depth, and access move the price far more than pier type does.

Helical piers typically run roughly $1,500 to $3,500 each installed, and push piers roughly $1,500 to $3,000. Engineers often space piers every 6 to 10 feet along the affected wall, so a typical foundation repair of 4 to 10 piers lands somewhere around $6,000 to $35,000. What pushes you up that range:

• Depth, because every extra section adds steel and labor
• Tight access, such as a low crawlspace where crews hand-dig
• Cutting through a slab for interior piers, plus patching afterward
• Engineering and permit fees, often several hundred dollars to $1,500 or more combined
• Landscaping, patio, or utility work around the excavation

A cheaper bid that skips the engineer's report or specifies fewer piers isn't a deal. It's a repeat repair.

Which should you choose for your situation?

For a heavy, conventional house with a settling wall, we'd pick push piers if the engineer confirms deep stable ground, and for lighter structures we'd pick helical. Your soil report can overrule both.

• Expansive clay, light structure: helical piers, for the uplift capacity and torque verification.
• Expansive clay, heavy house: either can work. Let the engineer set depth and type.
• Tight crawlspace: access depends on the contractor's equipment more than pier type, so ask which compact drive heads or ram setups they bring.
• Addition, porch, or chimney: helical piers, since there may not be enough weight to drive push piers.
• Heavy masonry wall, deep stable layer: push piers.

What should you ask contractors before you sign?

Get the pier type, count, target depth, and capacity method in writing, then press on permits and warranty terms.

1. Why this pier type for the soil and weight of this house?
2. What depth or torque do you expect, and what happens if you don't reach it?
3. Who pulls the permit? Many jurisdictions require one, and local code, often built on the International Code Council model codes, may require stamped plans. Your local building department has the final word.
4. Is this a transferable warranty, what does it cover (settlement, materials, labor), and what voids it?
5. How will you lift the structure, and how much lift do you expect?
6. Who repairs cracked drywall, concrete, and landscaping afterward?

Warranties vary widely. A lifetime promise is only as good as the company still standing in 20 years. The FTC's consumer advice pages are a useful place to review contract and payment red flags before you sign. Your next step: book an independent engineer's inspection, then get three bids against that one spec.