A helical pier is a steel foundation element that looks and functions like a giant screw: a central shaft fitted with one or more helical (spiral) bearing plates that are mechanically rotated into the ground until they reach a competent load-bearing layer. Once at depth, the pier transfers building loads through the weak near-surface soils to stronger strata below. Helical systems are available in a range of shaft sizes and plate diameters, are typically hot-dip galvanized for corrosion resistance, and are fitted with a bracket or coupling that ties directly into footings, grade beams, or foundation walls.
For homes, helical piers are chosen when site conditions or project constraints make conventional shallow footings risky or impractical. Typical use cases include new construction on infill lots with variable or loose fill, building on expansive Denver-area clays prone to shrink-swell, additions or remodels adjacent to existing foundations, sites with a high water table, and locations with limited access where large excavation equipment can’t reach. They’re also used to underpin and lift settled foundations because they can be installed with relatively low vibration, require minimal excavation, and can be loaded immediately after installation—advantages when working on a client’s occupied property.
At RKM Homes we treat helical piers as one of several engineered foundation solutions rather than a one-size-fits-all fix. We start with a geotechnical investigation and coordinate with structural engineers to size and locate piers, specify corrosion protection, and define the connection detail to the home’s foundation system. Installers monitor torque and stroke as the piers are advanced to verify capacity, and final integration can include jacking and permanent brackets or cast-in hardware for new footings. When properly specified and installed, helical piers give our Denver clients a reliable, low-impact way to build or stabilize homes on challenging lots.
Do I need a soil and geotechnical evaluation before using helical piers?
Before we decide on helical piers I always order a geotechnical report. That report tells us what’s actually under your yard — soil types, depth to a competent bearing layer, groundwater level, presence of fill or organics, and corrosivity — all of which determine whether helical piers are appropriate and how deep or robust they must be. For a typical single‑family lot I’ll ask for borings at or near the proposed footing locations (usually a minimum of 2–4 borings for a new home; more if the site is large, sloped, or has visible variations). Get the geotech early, before finalizing bids or foundation plans, so the foundation system is priced and engineered to the real subsurface conditions.
A geotechnical engineer also provides the specific design inputs a structural engineer and pier contractor need: allowable axial capacity, recommended torque‑to‑capacity correlation for helical anchors, minimum embedment depth to competent strata, and required corrosion protection or coatings. If the report shows loose sands, deep fill, high water table, or expansive clays, helical piers are often still a good solution because they reach deeper competent soils and can be installed without heavy excavation — but the report may call for proof load tests or longer shaft lengths and different coatings. Conversely, if the geotech flags organic layers, peat, or very soft compressible soils without a reachable bearing layer, the recommendation may be for an alternate deep foundation or ground improvement.
Practical steps I give homeowners: require a geotechnical report in the contract scope so you don’t buy a foundation assumption that changes later; ask the geotechnical firm to include explicit helical‑pier parameters (target torque, minimum penetration, corrosion allowances, and whether proof testing is required); make sure the structural engineer references those numbers on foundation plans; and verify borings were taken at the actual footing/piers locations. If you’re doing a repair or retrofit for settlement, insist on a site‑specific evaluation rather than a visual guess — it’s the single best way to avoid surprises and make sure helical piers are designed and installed to last.
Structural design, load capacity, and engineering requirements
What loads will a helical pier actually carry under my house and how are they sized? When we design with helical piers for a custom home, the structural engineer calculates capacity based on the combined dead, live, snow, wind and seismic loads that each pier or pier group must support — not on a guess. For typical residential projects you’ll commonly see pier capacities anywhere from about 10,000 to 40,000 pounds per shaft depending on shaft diameter, helix configuration and soil conditions, but the exact number should come from a site‑specific engineering calculation. Ask to see the engineer’s stamped load table showing required capacity per pier, number of piers per footing or beam, and the assumed safety factor so you know the design matches your foundation loads.
What engineering documents and approvals should I insist on before work starts? I always tell homeowners to require a stamped foundation drawing and calculation letter from a licensed structural engineer that calls out pier locations, design loads, allowable settlement criteria, corrosion protection, and any required tie‑beams or grade beams. The paperwork should also state the method the engineer used to correlate installation torque or test results to capacity, and whether a special inspection or proof load test is required. Keep a copy of those stamped plans in your construction file and confirm the permit set matches the engineer’s deliverables — that’s the document the building inspector will check against the work in the field.
How do engineers verify that the piers will perform long term and handle lateral or uplift forces? Engineers commonly require torque‑to‑capacity correlation from the manufacturer for vertical capacity and may call for proof (load) tests when higher confidence is needed; as a builder I request torque logs from the installer and an as‑built letter from the engineer verifying capacities were met. For lateral or uplift concerns — for example on walkout foundations, deck footings, or basements in seismic zones — the engineer will specify larger helix configurations, deeper embedment, or supplemental tie‑beams to distribute lateral loads; make sure those details are shown on the stamped plans so the contractor installs the system that the engineer actually designed.
How are helical piers installed and how do I choose a qualified contractor for my home?
As a custom home builder we’ve installed dozens of helical piers, and the actual installation is a straightforward mechanical process: crews position the bracket locations, assemble a lead helix section and extension shafts, then screw the pier into the ground using a hydraulic drive motor mounted to a small excavator, skid steer, or portable torque rig. Installers monitor torque as they advance the pier — that torque log is the primary record of capacity — and they add shaft sections until the required torque (and therefore capacity) is reached. For a typical residential job each pier often takes 15–60 minutes to set; the work creates limited vibration, no wet concrete waits, and the finished bracket or pile cap is ready to accept foundation loads quickly.
What you should expect on site and how to prepare: the crew will need clear, level access for their equipment and a stable spot to park machinery and store extension shafts, so move vehicles and fragile landscaping out of the way and mark any garden beds you want protected. Always request that they coordinate a utility locate before work begins — you want underground gas, water, and electrical lines identified. For new construction we coordinate helical brackets with the foundation crew so anchor plates are embedded or fastened where planned; for retrofit jobs expect local spot excavation for bracket mounting and short-term jacking if settling correction is needed. Cleanup is typically minimal but confirm how they will protect turf and repair small concrete or finish work where brackets are installed.
To pick a qualified contractor ask for these concrete items: proof of experience with helical systems (photos and references from comparable custom-home jobs), evidence of a calibrated torque-monitoring system and example installation logs, and a signed engineer’s report or installer certification tying torque readings to pile capacity. Verify general liability and workers’ comp insurance and get a written scope of work that includes number and location of piers, estimated schedule, site protection measures, who coordinates with your foundation/framing crew, warranty on workmanship, and a clear payment schedule. If they balk at providing installation records or an engineer-signed acceptance, look elsewhere — competent helical contractors will supply documentation and past-job references as a matter of course.
Costs, warranties, lifecycle maintenance, and long‑term performance
How much will helical piers cost for my home and what factors drive that price? As a Denver custom home builder I tell clients that per‑pier pricing ranges widely because the job is driven by site specifics: the number of piers required, required working load per pier (which dictates shaft diameter and length), how deep you need to go before reaching competent soil or bedrock, site access for the installation rig, and whether you’re underpinning an existing foundation or installing a new deep‑foundation system. Ballpark figures to discuss with contractors are typically in the low thousands per pier for straightforward installs, while small underpinning jobs often run from roughly $5,000–$25,000 and complete foundation systems can be much higher depending on house size and complexity. Get written scope items (pier count, design load, coating spec, required concrete pads or brackets) so you can compare apples to apples between bids.
What warranties should I ask for so I’m protected after installation? Expect two separate warranties: a manufacturer warranty on the steel and corrosion protection (specify hot‑dip galvanizing or epoxy coating and request the written service life estimate), and a contractor warranty for workmanship and installation — typically one to five years but negotiable on custom builds. Make sure the contract requires a certified installation report: torque records, installed lengths, and proof of load tests when required. Confirm whether warranties are transferable with the property, what specific conditions void them (for example, post‑installation excavation around the piers or chemical contamination), and that the contractor carries appropriate insurance and bonding; all of these should be explicit in the written contract.
What maintenance will keep helical piers functioning long term and what performance can I reasonably expect? Properly designed and installed helical piers are essentially low‑maintenance and, with appropriate corrosion protection for your soil, can reliably perform for 50 years or more. Practical homeowner tasks are simple: keep surface water away from foundation (graded soil, working gutters and downspouts), avoid digging or adding deep plantings near pier locations, keep records of the installation report and warranty, and do a quick visual check annually for new foundation cracks, sticking doors/windows, or settling signs. If you notice movement or if you have aggressive soil (high sulfate, very acidic) ask your builder or a geotechnical engineer about periodic inspections or installing corrosion monitoring—these small steps preserve performance and keep warranty coverage intact.
Building codes, permits, inspections, and compatibility with foundation type
What permits and plan approvals should I expect my builder to pull for helical piers, and what documents should I ask to see before work starts — as a builder I always include the foundation plan with the pier connection detail, the permit application showing the pier type and model, and the foundation engineer’s note that the piers are acceptable so the plan reviewer has everything they need to approve the job?
How will the building inspector verify the helical pier work during construction, and what proof should I insist on seeing before anything is covered up — on our jobs inspectors typically confirm that the piers are installed per the approved plans and manufacturer requirements, sign off on the inspection card, and we provide the homeowner with the inspection record plus the contractor’s installation log and any required witness-test or torque documentation?
Will helical piers work with my existing or new foundation type (slab, crawlspace, basement), and what details should be on the plans to make them compatible — from a builder’s perspective they integrate well with perimeter footings, grade beams and crawlspace/basement walls when the plans show the bracket locations, connection to reinforcement or anchor plates, and any sequence for concrete pours so the inspector and trades can coordinate?