Concrete Pier vs. Footing vs. Helical Pile: Foundation Types Explained
These three terms get used loosely and sometimes interchangeably, but they describe different foundation elements with different install methods, costs, and best-use cases.
On this page13 sections
- Foundation Types at a Glance
- Why the Terminology Confusion Happens
- Precise Definitions
- How to Decide Between Concrete Pier and Helical Pile
- How to Determine Which Foundation Type Fits Your Site
- Cost and Timeline Comparison
- Alternative: Precast Concrete Piers and Deck Blocks
- Common Mistakes
- Which Should You Choose: Decision Table
- Other Factors to Weigh
- Choosing Your Foundation Type: Step by Step
- Frequently Asked Questions
- Related Calculators
Choosing a poured concrete pier? Use the concrete pier calculator to work out your concrete volume once you’ve settled on a foundation type. This guide breaks down how the three terms actually differ.
Foundation Types at a Glance
| Concrete Pier | Footing (General Term) | Helical Pile | |
|---|---|---|---|
| What it is | A poured concrete vertical support element | Any foundation base bearing on soil — includes piers, slabs, and footing pads | A screw-in steel shaft with helical plates, mechanically driven |
| Installation | Dig, form (optional), pour, cure | Varies by type | Screwed in with hydraulic equipment, no curing time |
| Time to load-ready | Days (concrete cure time) | Varies | Same day — no cure time needed |
| Best soil fit | Most soil types with adequate bearing capacity | N/A (general term) | Poor, soft, or previously disturbed soil; sites needing minimal excavation |
| Relative cost | Lower material cost, more labor-intensive | N/A (general term) | Higher per-unit cost, faster installation |
Why the Terminology Confusion Happens
“Footing” is a general structural engineering term for any element that transfers a structure’s load into the soil — it’s not a specific shape or material. A concrete pier’s base is technically a footing, which is why the two terms often get used as if they mean the same thing. A helical pile is a completely different foundation category, but it’s sometimes loosely called a “pier” in casual conversation since it serves the same structural role — supporting a post above the ground.
Understanding the distinction matters mainly when you’re comparing quotes or researching options: a contractor quoting “helical piers” versus “concrete piers” is describing two fundamentally different products with different cost, timeline, and soil-condition trade-offs.
Precise Definitions
| Term | Precise Definition |
|---|---|
| Concrete pier | A poured, vertical concrete shaft (round or square) that transfers a post’s load down to bearing soil, typically formed with a sonotube or dug directly with an auger. |
| Footing | The general engineering term for any foundation element’s soil-bearing base — a pier’s bottom, a slab’s edge, or a spread pad are all “footings.” |
| Spread footing / footing pad | A wider, flatter concrete pad poured to spread load over more bearing area than a narrow pier alone would provide. |
| Helical pile (helical pier) | A steel shaft with one or more helical plates, mechanically screwed into the ground to reach load-bearing soil without excavation or curing time. |
| Sleeve or bracket adapter | The steel connection point atop a helical pile where a wood post or beam bracket attaches, analogous to a post anchor on a concrete pier. |
How to Decide Between Concrete Pier and Helical Pile
Standard soil, standard budget, timeline allows for cure time → concrete pier.
Poor/soft/fill soil, high water table, tight timeline, or minimal excavation desired → helical pile.
How to Determine Which Foundation Type Fits Your Site
- Get a soil assessment if bearing capacity is uncertain. Soft, fill, or previously disturbed soil often favors helical piles, which can be driven to a specific torque value confirming adequate bearing regardless of visual soil condition.
- Check your timeline. Concrete needs cure time before loading (commonly a few days to a full week depending on mix and temperature); helical piles are load-ready the same day.
- Check access and excavation constraints. Helical piles need only a small-diameter access point and no large hole, useful near existing structures, utilities, or trees where digging is restricted.
- Get quotes for both where the choice is unclear. Cost differences vary regionally and by contractor availability — a direct quote comparison is more reliable than a general rule of thumb.
Example 1: Standard Backyard Deck
- Site: Flat, stable soil, no access constraints
- Timeline: Standard, no urgency around cure time
- Foundation chosen: Poured concrete pier
With no site constraints pushing toward an alternative, concrete piers remain the lower-cost default for a standard residential deck build.
Example 2: Soft or Filled Soil Near a Retaining Wall
- Site: Recently backfilled soil, uncertain bearing capacity
- Concern: Concrete pier bearing on unverified fill could settle unevenly
- Foundation chosen: Helical pile, torqued to a verified bearing capacity
Helical piles can be driven past questionable fill soil to reach verified load-bearing depth, confirmed in real time by installation torque — something a poured pier can’t self-verify the same way.
Example 3: Tight Timeline, Cold Weather
- Site: Standard soil, but project needs to be load-ready within 48 hours
- Concern: Cold weather concrete cure time and strength development
- Foundation chosen: Helical pile, load-ready same day regardless of temperature
Concrete cure time extends in cold weather, which can be a deciding factor on a tight schedule where a helical pile’s immediate load capacity is worth its added cost.
Going with poured concrete? Use the concrete pier calculator to get your exact volume and bag count for every pier on the job.
Cost and Timeline Comparison
| Concrete Pier | Helical Pile | |
|---|---|---|
| Typical per-unit material cost | Lower | Higher (steel shaft and hardware) |
| Labor to install | Digging, forming, pouring, finishing | Mechanical driving, faster per unit once equipment is on site |
| Time before load-ready | Days, depending on mix and weather | Immediate |
| Excavation/spoil to manage | Full hole volume of soil removed | Minimal — no large hole dug |
| Best-fit soil | Firm to moderate soil with known bearing capacity | Soft, fill, or variable soil; sites needing depth verification |
Alternative: Precast Concrete Piers and Deck Blocks
A third option worth mentioning separately from poured piers and helical piles is a precast concrete pier or surface-set deck block — a factory-made concrete unit set on grade or in a shallow bed of compacted gravel rather than poured or driven into the ground. These are common on low, ground-level decks in frost-free regions but generally aren’t accepted by code for elevated structures or anywhere frost depth is a real design factor, since they don’t extend below the frost line the way a poured or driven foundation does.
Common Mistakes
- Using “pier,” “footing,” and “pile” interchangeably when comparing quotes. Confirm exactly which foundation type a contractor is proposing before comparing prices.
- Assuming helical piles are always more expensive overall. On sites needing significant excavation, dewatering, or extended cure-time scheduling, helical piles can come out competitive or cheaper once total project cost is considered.
- Choosing a precast deck block for an elevated or frost-exposed structure. Surface-set blocks generally don’t meet frost depth or elevated-load requirements that a poured pier or driven pile does.
- Not verifying helical pile torque/depth against an engineer’s requirement. A helical pile’s capacity is confirmed by installation torque — get that documented rather than assuming any installed pile meets your load requirement.
- Assuming a helical pile eliminates the need for a post anchor. Most helical piles still need a bracket or sleeve adapter to connect to a wood post, similar in concept to a concrete pier’s anchor.
Which Should You Choose: Decision Table
| Situation | Recommended Foundation Type |
|---|---|
| Standard soil, standard budget and timeline | Poured concrete pier |
| Soft, fill, or unverified soil | Helical pile (verified by installation torque) |
| Tight timeline or cold-weather scheduling | Helical pile (no cure time) |
| Limited excavation access (near utilities, trees, structures) | Helical pile |
| Low, ground-level deck in a frost-free region | Precast deck block may be code-acceptable — confirm locally |
| Elevated deck or any frost-depth requirement | Poured concrete pier or helical pile — not a surface-set precast block |
Other Factors to Weigh
- Local contractor availability and equipment access. Helical pile installation needs specialized hydraulic equipment that not every area has a contractor for.
- Local code acceptance. Confirm your jurisdiction permits helical piles for residential deck construction before pricing them as an option.
- Total number of foundation points on the project. Cost-per-unit trade-offs between methods shift with scale — larger decks amplify whichever method has the lower marginal cost per pier.
- Existing site conditions. Retrofit or addition projects near an existing structure often favor helical piles’ minimal excavation footprint.
- Warranty and engineering documentation needs. Helical piles typically come with manufacturer load-capacity documentation tied to installation torque, useful for permit or resale documentation.
Choosing Your Foundation Type: Step by Step
- Assess your soil — firm and known bearing capacity, or soft/fill/uncertain.
- Check your timeline and weather conditions against concrete cure-time needs.
- Check access and excavation constraints around the build site.
- Confirm local code acceptance for whichever type you’re leaning toward.
- Get quotes for both concrete pier and helical pile installation if the choice is close.
- For a poured concrete pier, calculate exact volume with the concrete pier calculator before ordering.
Frequently Asked Questions
Is a “footing” always concrete?
Not necessarily — footing is a general engineering term for any foundation element bearing load into soil, and could technically describe a pier’s base, a helical pile’s bearing plate depth, or a spread concrete pad.
Are helical piles as strong as concrete piers?
They can be, when properly sized and torqued for the load — helical pile capacity is verified during installation by torque readings correlated to bearing capacity, which is a different verification method than a poured pier’s strength-through-cure-time approach.
Can helical piles be removed or reused?
Yes, unlike poured concrete, helical piles can typically be unscrewed and relocated or reused, which is occasionally relevant for temporary structures or sites expecting future changes.
Why are helical piles more expensive per unit?
The steel shaft and helical plates cost more than concrete and rebar for a comparable load capacity, and installation requires specialized hydraulic equipment rather than a standard auger and concrete mixer.
Can I mix concrete piers and helical piles on the same deck?
Generally not recommended without an engineer’s input, since the two foundation types can settle or respond to load differently over time, potentially causing uneven movement across the structure.
Do deck blocks count as a “footing”?
In the general sense, yes — a surface-set deck block is a type of footing, but it’s a shallow, non-frost-protected type that most codes only accept for low, ground-level structures rather than elevated decks.
More deck pier & footing guides
Going with concrete piers? Use the concrete pier calculator to get exact volume, bags, and cost for your whole project.