Helical piers for new construction cost $2,700 per pier for the first three, then $2,200 per pier after that, and they carry the weight of a new build, addition, deck, or porch down to firm soil when the dirt near the surface is too weak or too wet to trust. Instead of pouring concrete footings and hoping the ground holds, a crew screws steel piers into the earth until each one hits load-bearing strata, then ties the new structure to those piers. 603 Basement Solutions self-performs every helical install in-house across the New Hampshire Seacoast, so the crew that engineers the layout is the same crew that drives the piers. Below is what that costs on a new-build or addition, how the system works, and when it beats a poured footing.

Helical pier pricing for new construction (603)

| Project | Typical piers | Ballpark total |

|—|—|—|

| Deck or porch footing replacement | 4–8 | ~$10,300–$19,100 |

| Room addition or sunroom | 6–12 | ~$15,000–$28,000 |

| New foundation on weak/wet soil | 12+ | ~$28,000+ |

_The first three piers are $2,700 each, then $2,200 each after that. Pier count is set by the load and the soil, so the only firm number comes from an on-site assessment and an engineered layout. Ranges are directional, not quotes._

Why a new build or addition uses helical piers instead of poured footings

A conventional footing only works if the soil directly under it can carry the load without settling. On a lot with soft clay, loose fill, a high water table, or organic topsoil over weak ground, that footing can sink unevenly the first winter, and a brand-new addition starts cracking before the paint dries. Helical piers solve that at the source. They reach past the weak surface layer and transfer the building’s weight onto firm soil or refusal deep below.

You will hear them called helical piers, helical piles, or screw piles. They are the same thing: a steel shaft with one or more screw-shaped steel plates (helices) near the bottom. A hydraulic motor turns the pier into the ground like a giant wood screw until the plates reach soil strong enough to hold the structure (Civil Today).

Three reasons builders reach for them on new work in New England:

The capacity is measured during the install, not assumed. The harder the soil resists as the pier turns, the more weight it can carry. The crew reads that resistance (installation torque) and stops at the value the engineer specifies, so every pier is verified on the spot. This torque-to-capacity method is formalized in the ICC-ES AC358 acceptance criteria the industry installs to (Cantsink / ICC-ES AC358).
They carry load immediately, with no cure time. There is no concrete to pour and wait on. Framing can start the same day the piers go in, which keeps a build on schedule (Hubbell CHANCE).
They go below the frost line cleanly. Piers are driven well past the depth where the ground freezes and heaves, so the addition does not lift and drop with the seasons.

New construction jobs 603 puts on helical piers

Helical piers earn their keep anywhere a new load lands on questionable ground:

Room additions and sunrooms

When you bolt a new room onto an existing house, the old foundation and the new one have to settle together or not at all. If the addition sits on weaker soil than the original footprint, it will move differently and tear at the connection. Piers anchor the new section to firm strata so it stays put with the house.

Decks and porches

Attached decks in New Hampshire have to reach below the frost line. In most communities that means footings roughly 48 inches deep, and attached decks get no exemption from that depth (Permits Guide, NH). On a wet or rocky lot, digging and pouring six to ten frost-depth footings is slow and messy. Screw piles reach below-frost bearing with no excavation, no spoil pile, and no pour to cure, then the beam mounts straight to a bracket on the pier (Family Handyman). When an old deck’s footings have heaved or rotted out, replacing them with helical piers is often cleaner than re-digging.

New garages, outbuildings, and small structures

Detached garages, barns, and ADUs on soft or filled ground get the same benefit: a verified, frost-protected support point without betting the build on surface soil.

Full foundations on poor soil

On a tight or low-lying lot where a soils report flags weak or saturated ground, a new home’s foundation can be carried on a grid of helical piers rather than over-excavating and re-compacting. Larger piles in this class carry substantial loads, which is why the same family of products supports everything from decks to multi-story buildings (Pier Tech).

If your project is about fixing a foundation that has already settled rather than building a new one, that is a different job. See our guide on what helical piers cost to repair a settling foundation.

What new-construction helical piers cost: the breakdown

Helical pier pricing is built one pier at a time, so the math is straightforward.

Per pier. 603 installs helical piers at $2,700 each for the first three, then $2,200 each after that. That covers the pier, the hydraulic install, and the bracket or cap that ties the new structure to it.

Number of piers. This is the biggest driver of the total. Piers are placed under the load path, usually under beams, posts, and bearing points, and spacing is set by the engineered design rather than a fixed rule. A deck might take 4 to 8; a room addition 6 to 12; a full new foundation more.

Engineering and permits. New-construction and addition work almost always needs a structural design and a town permit. On a helical job that includes the engineered layout (pier locations, helix size, and the target install torque) plus inspection. Budget for it on any new build.

Soil and depth. If firm soil is shallow, piers are shorter and faster. If the crew has to drive deep to reach refusal, that is more steel and more time. A soils report or test pier tells you which lot you have.

So the working formula is: (number of piers × per-pier price) + engineering, permits, and access. Nail down the pier count and you have a real range.

What moves the price up or down

Pier count and the load. A two-story addition puts more weight on each bearing point than a single-level deck, which can change both helix size and how many piers you need.
Depth to bearing soil. Shallow firm soil is cheaper than driving deep through fill or to ledge.
Site access. An open lot is quick. Working between an existing house and a property line, or over a finished yard, takes more care.
Soil obstructions. Buried debris, boulders, or old construction can slow the install.
Engineering scope. A simple deck needs less design than a full foundation grid.

How the install works on a new build

For most projects helical piers go faster than a dig-and-pour footing because there is no excavation to inspect and no concrete to cure.

Engineered layout. The structural design sets where each pier goes, the helix configuration, and the install torque that proves the required capacity.
Mark and stage. The crew lays out pier locations under the load path and brings in the hydraulic drive head.
Drive the piers. Each pier is screwed into the ground while the crew watches the torque climb, stopping at the engineered value that confirms it has reached load-bearing soil.
Cap or bracket. A steel cap, bracket, or new-construction connector ties the framing, beam, or foundation to the top of each pier.
Build on it. Because the piers carry load immediately, framing or foundation work can start without a curing delay.

Because 603 self-performs the install rather than handing it to a subcontractor, the engineering, the torque readings, and the warranty all stay with one crew. That is the difference homeowners feel when something needs to be verified or documented later.

Helical piers vs. poured concrete footings for new work

Poured footings. Lower material cost per point, familiar to every builder, but they need a frost-depth dig, an inspection before the pour, and days of cure time. On weak or wet soil their capacity is assumed from the soils report, not measured at each footing.
Helical piers. Higher per-point cost, but no excavation, no spoil, no cure delay, and the capacity of every pier is verified by torque as it goes in (Hubbell CHANCE). On a difficult lot, skipping the dig, the spoil haul-off, and the inspection-before-pour wait can close most of the cost gap.

The honest rule of thumb: on good, dry, stable soil a poured footing is hard to beat on price. The wetter, looser, or tighter the lot, the more a helical pier earns its premium, because it removes the part of the job that goes wrong on bad ground.

How long do they last, and what about the warranty?

The piers are galvanized steel driven below the frost line into stable soil, so they are built to last for decades. 603 backs the work with a 25-year engineered performance warranty that is transferable to a new owner, as long as no other contractor or the homeowner alters the installed work. On a new build or addition, a documented, torque-verified foundation with a transferable warranty is a record you can hand the next owner.

Helical piers for new construction in NH, southern ME & northeastern MA

603 Basement Solutions designs and self-performs helical pier foundations for new builds, additions, decks, and porches across the New Hampshire Seacoast, Rockingham County, southern Maine, and northeastern Massachusetts, from our base in East Kingston, NH. Pricing is $2,700 per pier for the first three, then $2,200 per pier, plus engineering and permits on new work. The only way to get your real number is an on-site assessment and an engineered pier count. Call (603) 610-1770 or request a visit below.

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Frequently asked questions

How much do helical piers cost for new construction?

603 installs helical piers at $2,700 per pier for the first three, then $2,200 per pier after that, plus engineering and permits on new-build or addition work. The total comes down mostly to how many piers the engineered design calls for: a deck might take 4 to 8, a room addition 6 to 12, and a full foundation more.

Can you build a new house or addition on helical piers?

Yes. Helical piers are a recognized deep-foundation system for new construction. They carry the structure’s load down to firm soil and are commonly used for additions, decks, garages, and full foundations on weak or wet lots. The capacity at each pier is verified by installation torque under the ICC-ES AC358 criteria.

Are helical piers cheaper than concrete footings?

On good, dry, stable soil, a poured footing usually costs less per point. On a wet, soft, or hard-to-access lot, helical piers can close most of that gap because they skip the frost-depth dig, the spoil haul-off, the inspection-before-pour wait, and the cure time, and they verify capacity at each pier.

Do helical piers need to go below the frost line in New Hampshire?

Yes. Helical piers are driven well past the frost line into stable soil, which is exactly why they suit New England. Attached decks in NH generally require footings to roughly 48 inches deep, and helical piers reach below-frost bearing without excavation.

How many helical piers does a deck or addition need?

That is set by an engineered design based on the load and the soil, not a fixed rule. Piers go under the beams, posts, and bearing points. A deck commonly needs 4 to 8; a room addition 6 to 12. A 603 estimator and the structural design confirm the exact count.

Can helical piers be installed in winter?

Yes. There is no concrete to cure, so 603 installs helical piers year-round, including through the New England winter, which keeps a cold-season build or addition on schedule.

Does 603 install the piers in-house?

Yes. 603 self-performs every helical install rather than subcontracting it. The same crew handles the engineered layout, drives the piers, records the torque, and stands behind the 25-year transferable warranty.

Helical Piers for New Construction & Additions: Cost and How They Work