# Piers vs Mudjacking: Which Foundation Fix Fits

> Compare piers and mudjacking for slab and foundation repair. Costs, lifespans, and when each method applies.

Canonical: https://foundationrepairlab.com/piers-vs-mudjacking/

Last updated: 2026-11-09

Piers and mudjacking address different problems. Piers extend below a foundation to reach stable bearing soil or bedrock, while mudjacking injects grout beneath a slab to lift it where the existing soil can still support the load. Choosing between them starts with measured crack width, displacement, and depth to bearing, not with price.

## How Piers Work

Piers are steel shafts driven or screwed into the ground until they reach load-bearing strata. Push piers are hydraulically driven and typically cost $1,000–$3,000 each. Helical piers are screwed into place and typically cost $700–$2,500 each. A full pier job usually ranges from $6,000 to $30,000 depending on pier count, depth to bearing, and site access.

If a foundation has settled 3 inches and requires eight push piers at $2,000 each, the pier material and installation portion alone is roughly $16,000. That figure excludes engineering, permits, and any interior finish repairs. Piers are appropriate when the foundation itself has moved or when soil beneath the structure can no longer carry the design load. They do not fill voids under a slab; they transfer the building’s weight to deeper, more stable ground.

## How Mudjacking Works

Mudjacking, also called slab jacking, pumps a cementitious grout mixture through holes drilled in a concrete slab. The grout fills voids and lifts the slab back toward its original position. Cost typically runs $3–$8 per square foot. Polyurethane foam lifting, a related method, costs about $5–$15 per square foot and cures faster, but the principle is the same: lift from below using the slab as the bearing surface.

For a 500-square-foot garage slab, mudjacking at $5 per square foot would cost about $2,500. At $8 per square foot, the same slab would cost $4,000. Mudjacking is suitable for slabs that have settled because of soil washout or compaction but where the slab itself remains intact and the underlying soil can support the load once voids are filled. It is not a structural underpinning method for a foundation wall or a home’s perimeter footing.

## Measuring Before Choosing

Measure first, method second, price third. Start with crack width. A crack at or below 1/16 inch is generally cosmetic. A crack at or near 1/8 inch warrants monitoring. Wall movement beyond 2 inches often indicates that localized slab lifting will not address the root cause. Record displacement at multiple points and note whether movement is ongoing or stabilized.

Depth to bearing determines pier length and count. A shallow bearing stratum may require fewer, shorter piers; deep bearing soil increases pier count and cost. An engineer inspection, typically $400–$1,500, can confirm whether the issue is a slab problem or a foundation problem. Inspection lead time is usually 1–2 weeks, and permits vary by city and county, typically taking 1–3 weeks.

## Cost Comparison by Scenario

Use these figures as estimates. Actual pricing depends on local labor rates, access restrictions, and the extent of movement.

| Repair method | Typical unit cost | Typical job range | Best suited for |
|---|---|---|---|
| Push piers | $1,000–$3,000 each | $6,000–$30,000 | Settled foundations needing deep bearing |
| Helical piers | $700–$2,500 each | $6,000–$30,000 | Tight access or tension-loaded conditions |
| Mudjacking | $3–$8 per sq ft | Varies by slab area | Shallow slab settlement with stable soil |
| Polyurethane foam | $5–$15 per sq ft | Varies by slab area | Fast-cure slab lifting where access is limited |

If a homeowner compares ten helical piers at $1,500 each against mudjacking a 400-square-foot porch at $6 per square foot, the pier estimate is $15,000 before engineering and finishing work, while the mudjacking estimate is $2,400. The pier price is higher because it addresses structural support, not just surface leveling. For more detail on pricing, see the breakdowns at /pier-and-beam-foundation-repair-cost/ and /mudjacking-cost/.

## Lifespan and Warranty

Pier warranties are commonly lifetime and transferable, though a transfer fee of $100–$500 may apply at resale. Mudjacking typically lasts 5–15 years. The shorter lifespan reflects the fact that mudjacking does not change the bearing capacity of the soil; if the soil continues to erode or compact, the slab can settle again. Piers bypass the problem soil entirely, which is why they carry longer warranty terms.

Neither method fixes drainage issues. If downspouts discharge against the foundation or the grade slopes toward the house, both piers and mudjacking can fail prematurely. Correcting surface drainage is a separate, lower-cost step that should accompany either repair.

## When to Consider Other Methods

Some foundation issues do not fit either category. Bowing basement walls may call for carbon fiber straps at $400–$1,200 each or wall anchors at $500–$1,500 each. Crawl space moisture problems may lead to encapsulation at $3–$8 per square foot, or $4,000–$15,000 per job. These are distinct scopes from slab lifting or underpinning. For wall-related repairs, see /carbon-fiber-foundation-repair-cost/ and /wall-anchor-cost/.

Replacement is rarely the first option. It typically costs $40,000–$150,000 and is generally considered only when more than one-third of the foundation has failed or when piers cannot reach adequate bearing. Restoration work, where applicable, is usually 10–25 percent of structural repair cost.

## Decision Framework

1. Identify the element: slab only, or foundation wall and footing?
2. Measure movement: crack width, displacement, and floor level variation.
3. Determine soil condition: stable bearing soil, washout, or deep fill?
4. Get an engineer inspection: $400–$1,500, usually available within 1–2 weeks.
5. Compare unit prices: pier count and depth versus square footage of slab.
6. Check permits: timelines vary by city and county, typically 1–3 weeks.

Piers cost more per unit but address structural bearing. Mudjacking costs less per square foot but lifts slabs without changing the load path to deeper soil. Match the method to the measurement, not the other way around.

Next, compare [foundation repair cost](https://foundationrepairlab.com/foundation-repair-cost/), [pier and beam foundation repair cost](https://foundationrepairlab.com/pier-and-beam-foundation-repair-cost/), [foundation crack repair cost](https://foundationrepairlab.com/foundation-crack-repair-cost/) before you commit.