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Learning Center · Methods & Money

How Many Piers Does a House Need?

6 min readUpdated June 2026By Ricardo Chamorro · ICC-certified Residential Building Contractor
6'-0"AFFECTED: REAR (55') + CORNER RETURN (15')= 70 LF ÷ 6 ≈ 13 PIERS, CORNER SHARED
Piers support the affected footage at roughly 6-foot intervals — the corner pier serves both intersecting walls.

Every foundation quote is really a pier count wearing a dollar sign. So before you compare bids — or panic at one — it helps to know how the count is honestly derived. The good news: the math is simple enough to do on a napkin.

The rule: affected footage, not house size

Piers don't go around your house; they go under the parts that are moving. The honest formula:

  • Step 1: The elevation survey identifies which wall runs are actually low and trending — the affected linear footage.
  • Step 2: Divide by 6 (standard spacing, set by what grade beams can span) and round up.
  • Step 3: Corner logic: an affected corner needs support on both intersecting walls, with the corner pier shared between them.
  • Step 4: Adjustments: two-story sections carry roughly double the load and may need tighter spacing; severe drops sometimes take an extra pier as a lifting point.

Worked examples (typical corridor homes)

  • Settled rear corner: 12 ft on the back wall + 12 ft on the side = 24 LF ÷ 6 = 4 spans → 5–6 piers.
  • One full side (the dried-out west wall): 48 LF ÷ 6 = 8 spans → 9–10 piers.
  • Rear + corner return (the diagram above): 70 LF → about 13 piers, corner shared.

Pair these with per-pier prices from the cost guide and you can sanity-check any bid in your head — which is exactly why we publish both.

What the formula can't estimate: interior movement. Piers along the perimeter can't reach the middle of a slab — interior support involves tunneling or breaking out floor, and honest companies will tell you that math requires its own evaluation, not a napkin. (Our calculator says the same thing when you select 'center.')

Estimate yours in two minutes

The repair calculator runs this exact logic on a sketch of your floorplan: draw the shape, tap the affected walls, and it places piers at 6-foot spacing with the corner rules applied — then shows the math openly, the way a quote should.

Acorn Finance — easy payment options. Check your rate.

Financing through Acorn Finance, an independent third party. Checking your rate won’t affect your credit score.

The napkin math gets you close. The free elevation survey gets you a firm count — and shows you every reading behind it.Get My Real Number

From real Central Texas jobs and inspections

Series of pier holes dug along the exterior of a home ahead of foundation pier installation
Pier holes dug along home exterior corner under cloudy sky — corner sections typically add two to three piers to the count.
Open pier pits dug along the foundation line of a brick home during underpinning work
Open pier pits along brick foundation line with spoil — the length of settling wall sets the pier count.
Hand-dug pier holes spaced along the slab edge of a home in preparation for foundation piers
Pier holes excavated along the slab edge of a home — each open hole here is one pier in the final tally.
Hand-dug pier holes and excavated soil beside a home's bay window during foundation pier installation
Two excavated pier holes and spoil pile beside a bay window with caution tape — corners and bay windows often demand extra piers.
Line of foundation pier excavations wrapping a home's corner, dug to lift and level the slab
House corner with line of pier holes and spoil piles across lawn — a typical corner run: several piers wrapping the settled section.

Straight answers

Related questions.

Grade beams are designed to span limited distances unsupported. At wider spacing, the beam itself can deflect between piers — you'd stabilize the piers and still grow cracks between them. Six feet (give or take a foot by beam condition) keeps the spans inside what typical residential beams carry comfortably.
Mechanically possible, usually false economy. You'd pay mobilization twice, and the unsupported half keeps moving against the stabilized half — sometimes cracking exactly at the seam. Where budget is the constraint, ask about method (concrete vs steel) before asking about partial scope.
Sometimes legitimate (severe, multi-side movement happens) — but full-perimeter quotes deserve scrutiny. Ask to see the elevation map and which readings justify piers on each wall. If the north side reads level and they're piering it anyway, ask why. 'Prevention' is not a measurement.

Keep reading

Wondering about your own house?

A free elevation survey answers in an hour what an article can only describe — and 'you're fine' is a real possible outcome.

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