# Foundation Piers in Tennessee | Push vs. Helical, Cost

> Foundation piers in Tennessee: push piers vs. helical piers, how many a house needs, why depth to rock varies across the state, and cost per pier.

URL: https://tennesseefoundationrepair.us/foundation-pier-installation/

Tennessee Foundation Repair connects Tennessee homeowners with participating contractors for **foundation piers** and underpinning. A pier is a steel shaft installed beside or under a footing that reaches deeper, firmer ground than the soil the house was built on. Brackets tie it to the footing so the house rests on the piers instead of the soil that has been giving way.

## Push piers vs. helical piers

Both are steel, both are installed with brackets on the footing, and both are common. They differ in how they get into the ground:

- **Push piers (resistance piers):** sections of steel pipe driven down with hydraulic rams, using the weight of the house as resistance, until they hit load-bearing soil or rock. Common under heavier houses and where rock is reachable.
- **Helical piers:** steel shafts with round plates (helices) screwed into the soil to a measured torque. Common under lighter structures, porches, and additions, and where the house is too light to push against.
- **Concrete piers and pressed pilings:** poured or stacked concrete; used by some contractors, with different depth and capacity limits.

## Why depth changes across Tennessee

Piers go until they reach something that can carry the load, and in Tennessee that distance varies a lot. USGS well data puts the median depth to bedrock at about **2.4 meters (roughly 8 feet)** in the inner Central Basin around Nashville and Murfreesboro, and about **12.8 meters (roughly 42 feet)** in the Valley and Ridge of East Tennessee, with wide variation within each region. Karst adds another wrinkle: the rock surface in limestone country can be pinnacled and uneven, with soil-filled gaps, so two piers a few feet apart can stop at different depths. A contractor should record the depth and pressure or torque reached at each pier.

## How many piers does a house need?

It depends on how much of the foundation is settling, the weight of the house, and the pier capacity. Piers are typically spaced several feet apart along the affected wall, and a contractor should show you on a drawing where each one goes. Be cautious of a quote that piers far more of the house than the visible movement suggests, or far less; an independent structural engineer can check the layout.

## What pier installation involves

For an exterior job, the crew digs a hole at each pier location down to the footing, prepares the footing, mounts the bracket, installs the pier, and transfers the load. Some lift the house at that stage. Holes are backfilled afterward. Interior piers go through the basement or garage floor. Expect noise, digging in landscaping, and a few days of work for a typical job. Ask about utility locating before anyone digs: Tennessee 811 marks underground lines.

## When piers may be the right conversation

- A corner or side of the house has settled and cracks are growing.
- A previous crack repair keeps reopening.
- An engineer has recommended underpinning.
- A porch, chimney, or addition is sinking away from the house.
- You are adding weight (a second story or heavy addition) to an older foundation.

## What foundation piers cost

HomeAdvisor's June 2026 data puts piering and underpinning at **$1,000 to $3,000 per pier**, and a settling or sinking foundation repair overall at $5,000 to $25,000. Multiply the per-pier figure by the number of piers on the plan to sanity-check a quote, then add excavation, engineering, permits, and landscaping repair if they are listed separately. Try the [cost range calculator](https://tennesseefoundationrepair.us/foundation-repair-cost-calculator/).

- **Number of piers.**
- **Depth** to load-bearing soil or rock.
- **Pier type:** push, helical, or concrete.
- **Interior vs. exterior** installation and access.
- **Lifting,** engineering, and permits.

## What you can do right now

1. Mark on a sketch of your house where the cracks and sloping floors are.
2. Note decks, patios, and plantings along the affected walls; they affect access.
3. Find any past inspection or engineering reports.
4. Get more than one proposal for a pier job, each with a pier layout drawing.
5. Call and ask what pier type and spacing the contractor typically uses.

## Questions to ask about pier installation

- Push or helical, and why for my house?
- How many piers, where, and what is the rated capacity of each?
- Will you record the depth and the pressure or torque reached for every pier and give me the log?
- Will you try to lift the house? What might crack?
- Who calls Tennessee 811, and who repairs landscaping afterward?

## FAQ

**How much do foundation piers cost?**

HomeAdvisor's June 2026 data puts piering and underpinning at $1,000 to $3,000 per pier. The total depends on how many piers the plan calls for, how deep they go, and access.

**Are helical piers better than push piers?**

Neither is better everywhere. Push piers use the weight of the house to drive to rock or firm soil; helical piers screw in and suit lighter loads or situations without enough weight to push against. The right choice depends on the house and the soil.

**How deep do foundation piers go in Tennessee?**

It varies. USGS well data puts the median depth to bedrock around 8 feet in the inner Central Basin and around 42 feet in the East Tennessee Valley and Ridge, with wide local variation. Piers go until they reach load-bearing material, so the depth is measured during installation.

**Will piers lift my house back to level?**

Piers can be used to lift a settled section, but full leveling is not always possible or advisable. Lifting can open cracks in drywall and affect plumbing. Ask what the contractor expects to achieve.

**Do I need a structural engineer or a foundation repair contractor?**

Sometimes both. A contractor evaluates the house and proposes the repair they install. An independent licensed structural engineer assesses the cause and can specify a repair without selling one; HomeAdvisor puts a structural engineer inspection at $340 to $780. An engineer is worth it for major movement, a sinkhole near the house, a home sale, or contractors who disagree.

Referral disclosure: Tennessee Foundation Repair is an independent contractor-referral service. We help connect Tennessee property owners with participating foundation repair professionals. Services are performed by independent contractors. We may receive compensation for qualified referrals. Phone: (865) 276-7293.