How Many Piers Does a House Need? What Determines the Count

How Many Piers Does a House Need? What Determines the Count

Most homes need 8 to 30 piers for foundation repair. The count depends on the home’s weight, the soil’s bearing strength, and how much foundation has settled.

How many piers does a house need for foundation repair? Most single-family homes need 8 to 30: a settled corner takes 6 to 8, a typical full-perimeter job takes 12 to 20, and a large home settled on multiple sides can run past 30. Your number comes from the home’s weight, the soil underneath, and how much foundation has settled.

No contractor can give you that number without visiting — anyone quoting a pier count over the phone is guessing. And the count matters: too few piers and the spans between them keep flexing until the cracks come back; too many and you pay for steel your house never needed. In Shreveport and across Northwest Louisiana, our expansive clay adds a twist: piers must reach past the active clay layer to stable soil.

The Short Answer: Load, Soil, and Layout Decide

Every pier in a foundation repair does the same job: carrying a share of your house’s weight down to soil strong enough to hold it. So the count comes from three questions: how heavy is the house, how strong is the soil at pier depth, and how much of the foundation needs support?

Load is the weight each pier must carry. A single-story wood-frame ranch weighs far less per linear foot than a two-story brick home, so heavier walls need piers closer together — which is why a brick two-story in South Highlands needs more piers than a wood-sided ranch of the same footprint in Broadmoor.

Soil is what the pier bears on. In Northwest Louisiana, the top layer is expansive clay that swells and shrinks with the seasons — useless as long-term support. Piers get driven through it to denser, stable strata below, and the bearing capacity at that depth sets how much weight each pier can carry.

Layout is which parts of the foundation actually need help. Settlement is rarely uniform — usually one or two sides drop while the rest holds. Piers go where the elevation survey shows movement. A house that dropped on the south side only might need 8 piers; the same house settled on three sides might need 24.

How Contractors Actually Calculate Pier Count

Here is the process a competent contractor follows — and what you should expect to see explained in your quote. First, the elevation survey: floor readings on a grid map the high and low spots in fractions of an inch, defining the repair area. No survey, no credible pier count. Second, the load estimate: the weight per linear foot of the settled walls, accounting for stories, brick vs. siding, and roof type. Each pier type has a rated capacity, and spacing is set so no pier carries more than its safe share.

Third, the spacing rule: for residential steel push piers and helical piers, spacing typically lands at 6 to 8 feet on center — tighter for heavy brick walls and poor soils, wider for light frame walls on good bearing. Divide the settled wall length by the spacing and you have your count: a 48-foot wall at 6-foot spacing needs 8 piers. Fourth, the extras: corners often get piers on both adjoining walls, concentrated loads near openings may get an extra pier, and interior supports go where the elevation map shows the slab middle sagging.

Ask for that plan in writing: pier locations marked on a sketch of your house, with the count, the spacing, and the reasoning. A contractor who cannot show you why each pier is where it is has not done the calculation. Our steel push pier installation page walks through how the piers themselves work once the plan is set.

Typical Pier Counts by Home Size and Situation

Every house is different, but patterns exist. These are the ranges seen across Shreveport, Bossier City, and the surrounding parishes for common situations — use them to sanity-check a quote, not to price your own job:

Home Situation	Typical Pier Count	Why This Range
One settled corner, small ranch	6–8 piers	Two short wall runs meeting at a corner, light frame construction
One full settled side, average home	8–12 piers	40–60 feet of wall at standard 6–8 ft spacing
Full perimeter, 1,500–2,000 sq ft slab home	14–22 piers	Entire perimeter at standard spacing plus corners
Full perimeter, two-story brick home	20–30+ piers	Heavier walls need tighter spacing; brick and second story add load
Sinking addition or garage	4–8 piers	Smaller footprint, often on its own footing separate from the house
Interior slab supports	2–6 piers	Added where the elevation map shows the slab middle sagging

Notice what is missing from the table: square footage alone. Two 2,000-square-foot homes can need wildly different pier counts if one settled on a single side and the other dropped on three. Settlement pattern matters more than house size — another reason the elevation survey drives the plan, not the tax assessor’s square footage.

And a word on interior piers, since they surprise homeowners: on a slab home, the crew cuts small holes through the slab inside the house — often in a closet or utility room — to reach the soil below. The patch is concrete, the flooring goes back, and the middle of your slab stops sagging.

Steel Push Piers vs. Helical Piers: Does the Type Change the Count?

Short version: not much. Both are deep foundation supports, both get spaced on the same 6-to-8-foot logic, and a house that needs 14 steel push piers would need roughly 14 helical piers in the same locations. The type changes how the pier reaches bearing soil, not how many you need.

The real difference is installation. Steel push piers are hydraulically driven straight down, using the weight of the house as resistance, until they hit refusal — the point where the soil is dense enough that the pier will not go further. Helical piers are screwed in like giant augers, with torque readings telling the crew when they have reached adequate bearing. Our guide to whether helical piers can lift a house digs into the lifting side of that comparison.

What does change the cost is depth. Where the stable bearing layer sits deeper, piers go deeper — and deeper piers cost more per pier, not more piers. If a contractor says your soil requires “extra piers,” ask whether they mean deeper piers or more of them; the distinction matters for your wallet. Depth questions are covered in our article on how deep helical piers go.

What Too Few — or Too Many — Piers Costs You

Pier count is one of the easiest places for a bad quote to hide, in both directions. Too few piers is the classic cheap-bid trick: the quote comes in lower because it specs 8 piers where the engineering calls for 14. The doors work for a season, then the long unsupported spans start flexing again. Cracks reopen, floors slope back, and you pay twice — once for the cheap job, once for the real one.

Too many piers is the quieter version. Each unnecessary pier is steel, labor, and slab cuts your house did not need — typically many hundreds of dollars apiece. It rarely harms the structure, which makes it harder to spot. The tell: a quote that piers the entire perimeter at tight spacing when the survey shows movement on only one side. Every pier should sit on or near a low reading on the survey map.

The right count looks boring on paper: piers at sensible spacing, exactly where the survey shows settlement, with corners and load points covered and nothing extra. The quote explains the spacing, the plan is drawn on your floor plan, and a 20-year structural warranty on qualifying repairs backs the whole thing. Boring is what you want holding up your house.

Why Shreveport’s Clay Changes the Math

Here is the Louisiana-specific piece. Our expansive clay has an “active zone” — the top several feet of soil that swells and shrinks with moisture changes. Piers must extend below that zone into stable soil, or they just ride the swell cycle along with everything else. That typically means piers driven to significant depth here, confirmed by refusal or torque readings — not by a number someone wrote down in the office.

This affects your quote two ways. First, deeper piers cost more apiece, so identical pier counts can price very differently depending on whether the contractor truly drives to refusal — which should be in your contract language. Second, spot repairs in clay country sometimes grow: a house piered on one side can see another side move years later. A good inspection flags borderline areas honestly.

The clay is also why drainage keeps showing up in pier conversations. Piers solve the structural problem; managing water around the foundation protects the solution. Grading, gutters, and sensible watering in drought keep the soil between the piers quiet for the long term. For a deeper look at the soils at work here, the USDA Natural Resources Conservation Service publishes soil survey data mapping what sits under Northwest Louisiana neighborhoods — and our Pelican Foundation Repair team is happy to walk your property and explain what it means for your home.

How to Read a Pier Quote Like a Pro

You will likely get two or three quotes. Compare them on more than the bottom line:

• Match pier counts to the survey. Every quote should reference an elevation survey, and every pier should sit on or near a low reading. Divide wall length by pier count — much beyond 8 feet between piers on a brick home is a red flag.
• Look for “driven to refusal.” The contract should say piers go until they reach stable bearing, not to a fixed depth. Fixed-depth piers in variable clay are a gamble.
• Read the warranty, not the brochure. Get the actual warranty document before signing: what is covered, what voids it, and is the 20-year structural warranty on qualifying repairs in writing?
• Beware the round number. Exactly 10 piers on an irregular settlement pattern is suspicious. Real pier plans produce odd numbers — 13, 17 — because they follow the survey, not a sales tier.

The best question you can ask any contractor is also the simplest: “Show me on the survey map why each pier is where it is.” The good ones light up. The bad ones change the subject.

Frequently Asked Questions

How many piers does a typical house need for foundation repair?

Most single-family homes need 8 to 30 piers: a single settled corner might take 6 to 8, a typical full-perimeter job takes 12 to 20, and a large two-story brick home can need 20 to 30 or more. The exact count comes from an elevation survey, the home’s weight, and the soil.

What determines how many piers a house needs?

Three things: the load (weight per linear foot of wall), the soil (depth and bearing strength of the stable layer), and the layout (how much of the foundation has settled). Spacing typically lands 6 to 8 feet apart along the settled areas.

How far apart should foundation piers be spaced?

For residential steel push piers and helical piers, 6 to 8 feet on center is the standard range. Heavier construction like two-story brick calls for tighter spacing, while lighter frame walls on good soil can go wider. Spacing much beyond 8 feet on a brick home is a red flag.

Can you install too many piers?

Structurally it rarely causes harm, but each unnecessary pier costs you money — typically many hundreds of dollars apiece in steel, labor, and slab work. A quote that piers the whole perimeter when the survey shows movement on one side deserves a hard question about every extra pier.

What happens if a house does not get enough piers?

The spans between piers keep flexing, and the symptoms — cracks, sloping floors, sticking doors — come back. Under-piered jobs are the most common reason homeowners pay for foundation work twice.

Do piers go under the whole house or just the settled part?

Just the settled part, in most cases. Piers go where the elevation survey shows movement; piers under stable sections add cost without benefit.

How deep do foundation piers need to go in Louisiana?

Below the active clay zone into stable, load-bearing soil. Depth varies by location and is confirmed during installation by refusal (push piers) or torque readings (helical piers) — the contract should say “driven to refusal,” not a fixed depth.

Pelican Foundation Repair
6118 Fairfield Ave, Shreveport, LA 71106, USA
318-585-2003
https://foundationrepairshreveport.com/