Most homeowners meet helical piers after a foundation fails. Builders meet them earlier.
On sites with weak, variable, or saturated soil, engineers specify helical piers for new construction during design. Crews drive them before the footings get poured. The building starts on verified bearing capacity instead of hoping the soil holds.
This guide covers what helical piers for new construction do, how deep and how far apart they go, what they cost, and what to require from your installer before signing.
What Is a Helical Pier Foundation?
A helical pier is a steel shaft with one or more helix plates welded near the tip. Hydraulic equipment rotates the shaft into the ground like a large screw. Each plate bites into the soil and pulls the shaft deeper. Driving stops when the tip reaches load-bearing strata.
Alexander Mitchell patented the design in the 1840s. Engineers have used the same principle ever since.
Installers measure torque throughout the drive. Torque correlates to capacity, so every pier gets verified during installation rather than assumed afterward. No other deep foundation method gives you a load reading on every single support.
Shaft sizes range from 1.5-inch square bar up to 4.5-inch tubular. Axial compression limits run from roughly 60,000 pounds to 160,000 pounds per pier depending on shaft selection.
Why Builders Specify New Construction Helical Piers Before the Pour
Conventional footings assume consistent soil across your whole site. Real sites rarely cooperate.
Drilled concrete piers and grade beams work well when bearing soil sits at a uniform depth. When depth varies, engineers over-design the whole system to cover the worst spot. You pay for material and labor across the entire footprint to solve a problem affecting one corner.
Helical piers for new construction get engineered pier by pier. Each one goes as deep as the soil at that location requires. Nothing gets over-built.
The schedule advantage matters as much as the material savings:
- Piers accept load immediately after installation. No concrete cure delay before framing starts.
- Installation runs in any weather. Rain does not stop a drive the way rain stops a pour.
- Crews work with smaller equipment and fewer people.
- Excavation stays minimal, which cuts spoil removal and site restoration.
- Drives run quiet, which helps on infill lots and jobs with noise restrictions.
- Steel arrives ready to install. No batch plant scheduling.
Getting out of the ground faster protects your margin on every job behind schedule. This is one reason new construction piering keeps gaining ground on builds where soil conditions are unpredictable.
Where Helical Piers Earn Their Keep in Georgia
North Georgia sits on Piedmont soils. Depth to competent rock swings wildly across short distances. One corner of your lot might hit refusal at eight feet while the opposite corner needs twenty-five.
Red clay adds a second problem. Georgia clay expands when wet and shrinks when dry. Shallow footings ride those seasonal cycles. Helical piers bypass the active zone entirely and transfer load below the layer doing the moving.
Three site types across metro Atlanta call for piering more often than others:
- Fill sites. Subdivision lots cut and filled during grading carry loose material of unknown depth.
- Sloped lots. Hillside builds around Gainesville, Woodstock, and Dawsonville often need deep support on the downhill side.
- Former agricultural or wooded land. Organic layers near the surface compress under load.
A geotechnical report tells you which category your site falls into. Order one before design, not after.
How Pre-Construction Helical Piers Get Installed
The sequence differs from a repair job. Repair crews work around a standing building. New construction crews work on open ground, which speeds everything up.
Step 1. Excavate and prep the site. Footing forms go in position.
Step 2. Drive the piers at engineered intervals along the footing lines. Hydraulic machinery rotates each shaft to the target depth while a gauge tracks torque.
Step 3. Tie the pier caps into the rebar grid inside the forms.
Step 4. Pour the footings. The concrete cures around a support system already carrying verified capacity.
Your framing crew starts on schedule. The piers were ready the day they went in. This staged approach is why pre-construction helical piers fit so well into a normal build sequence instead of disrupting it.
Sizing, Spacing, and Depth for New Construction Helical Piers
Three numbers drive your pier layout. All three come from your engineer, not from a rule of thumb.
- Spacing. A typical residential structure needs a pier every six to nine feet along load-bearing lines. A four-story building needs one every four feet to hit the required factor of safety.
- Depth. Most helical piers land between 10 and 25 feet deep. Difficult sites go further. Installations past 100 feet exist. There is no fixed maximum. The pier goes as deep as the load and soil demand.
- Count. A single-family home foundation typically needs somewhere between five and fifteen piers depending on footprint and soil. Larger and multi-story structures need proportionally more.
Your structural engineer runs the load calculations and specifies shaft size, helix configuration, and target torque for each location. Your installer drives to the spec and documents the result.
New Construction Helical Piers Cost
Industry pricing runs $10 to $30 per linear foot of shaft. Most piers fall between five and twenty feet in length.
Average installed cost per pier lands around $900 to $1,300 for standard residential work. Piers requiring larger equipment or unusual depth run $2,000 to $3,000 each.
New construction helical piers cost differently from repair pricing in two ways.
Labor per pier drops. Crews work on open ground with clear access. Nobody excavates around a standing structure or works through a crawl space hatch.
Pier count rises. Repair jobs support the failing sections. New construction supports the whole footprint.
Compare the total against your alternative rather than against a repair quote. One helical pier costs more than one comparable concrete footing. On projects needing deep support, the labor savings, the eliminated cure time, and the reduced excavation close the gap and often reverse the outcome.
Ask your installer for a per-pier price plus a mobilization figure. Ask what happens if a pier hits refusal early or drives deeper than specified. Both scenarios happen on Georgia sites.
Code Compliance and What to Require From Your Installer
Helical pier systems carry ICC-ES Evaluation Service Reports. An ESR confirms the product meets International Building Code requirements. Request the ESR number before you approve a submittal.
Four things belong in your file on every job:
- The ESR number for the pier system being installed
- Manufacturer quality certification, ISO 9001:2015 or equivalent
- Stamped engineering drawings showing pier locations, shaft specs, and target torque
- Installation logs recording achieved torque and final depth at every pier
The installation log is your proof of capacity. Any installer refusing to provide one is a problem. Walk away.
When Helical Piers Are the Wrong Call
Helical piers are not universal. Two conditions rule them out.
Rocky soil and shallow bedrock. Helix plates need soil to bite into. Cobbles, boulders, and shallow rock cause early refusal and damaged tooling. Driven piles or drilled shafts handle those sites better.
Extremely heavy structures. Very high point loads sometimes exceed practical helical capacity, pushing the design toward micropiles or drilled caissons.
Your geotechnical report answers this before design starts. A contractor recommending helical piers without reading one is guessing.
Frequently Asked Questions
Can you build a house on helical piers?
Yes, on the right site. Builders use building a house on helical piers as a standard approach for residential foundations, decks, additions, and outbuildings, and engineers specify them for schools, retail, industrial buildings, and bridges. Site soil determines suitability, not building type.
How deep do helical piers go for new construction?
Most land is between 10 and 25 feet. Depth depends on where competent bearing soil sits, so two piers on the same lot often differ by ten feet or more.
How many helical piers does a new house need?
Plan on one every six to nine feet along load-bearing lines for a typical residential structure. Taller and heavier buildings need tighter spacing. Your engineer sets the final layout.
Do you install helical piers before or after excavation?
After excavation, before the pour. Crews prep the site, set footing forms, drive the piers, tie the caps into the rebar grid, then pour.
Do helical piers cost more than conventional footings?
Per unit, yes. Across a full project on difficult soil, often no. The savings show up in reduced excavation, smaller crews, no concrete cure delay, and no over-design across the whole footprint.
Do helical piers meet building code?
Systems carrying an ICC-ES Evaluation Service Report comply with the International Building Code. Request the ESR number during submittal review.
How long do helical piers last on a new build?
Galvanized steel piers installed below the active soil zone are designed for the service life of the structure. Corrosion protection specifications vary by soil chemistry, so ask your engineer about your site.
Specify With Confidence on Your Next Georgia Build
Guessing at soil costs more than testing soil. Every over-designed footing and every mid-job foundation change order started with an assumption nobody verified.
Tri-State Waterproofing has installed deep foundation support across Georgia, Tennessee, and the Carolinas for over 20 years. We work from your geotechnical report and your engineer’s drawings, drive to specified torque, and hand you the installation log for every pier.
Talk to us during design, not after the excavator leaves. Call 770-869-7888 or request a consultation online.
