Short answer
A slab foundation repair that needs piers usually costs about $6,000 to $25,000, and severe jobs can reach $30,000 to $40,000, per 2025 and 2026 cost guides. The widely quoted $5,200 national average blends small crack repairs with pier jobs. Add an engineer's report, often $500 to $3,000, and a permit.
Key facts
- Underpinning for moderate settlement using 5 to 8 piers costs $6,000 to $25,000, per HomeGuide (2024 underpinning guide).[3]
- Fixr puts the national average for all foundation repair at $5,200, with underpinning or piering at $10,000 to $40,000 (January 2026).[4]
- A structural engineer's report costs $500 to $3,000, per HomeGuide (February 2026).[1]
- Houston requires a permit for slab foundation repair, with engineer plans showing the location, quantity and type of piers.[7]
The short answer, by job size
Slab foundation repair prices depend on one thing more than any other: how many piers the house needs. Here is how the price sources break it down.
| Job | Typical range | Source (date) |
|---|---|---|
| Single pier | $1,000 to $3,000 | HomeGuide (Nov 2024)[3] |
| Minor settlement, 2 to 4 piers | $2,000 to $12,000 | HomeGuide (Nov 2024)[3] |
| Moderate settlement, 5 to 8 piers | $6,000 to $25,000 | HomeGuide (Nov 2024)[3] |
| Severe settlement, 8 to 10+ piers | $10,000 to $30,000+ | HomeGuide (Nov 2024)[3] |
| Moderate settling repair | $4,500 to $15,000 | HomeGuide (Nov 2025)[2] |
| Severe sinking repair | $15,000 to $40,000 | HomeGuide (Nov 2025)[2] |
| Underpinning or piering | $10,000 to $40,000 | Fixr (Jan 2026)[4] |
| 7 to 10 piers | $7,000 to $30,000, about $16,000 average | Today's Homeowner (Apr 2025)[6] |
| Slab mudjacking, 1,500 sq ft foundation | $4,500 to $9,000 | HomeGuide (Nov 2025)[2] |
Why the "$5,200 average" misleads
You will see a national average of about $5,200 on many sites. Fixr lists $5,200[4]. This Old House, using Angi data, lists $5,179, within a typical range of $2,224 to $8,134[5].
Those averages mix every kind of foundation job together, from a $200 crack seal to a $40,000 lift. A slab that needs piers is the expensive end of that mix. HomeGuide puts moderate settlement at 5 to 8 piers and $6,000 to $25,000[3]. If your house needs piers, plan around that, not the blended average.
A note on independence: Angi, HomeAdvisor and This Old House share one dataset. This Old House says its estimates are "based on cost data from Angi"[5]. We count them as one source. HomeGuide is separate. Fixr and Today's Homeowner pages are separate sites, but their foundation pages credit the same writer, so we do not lean on them as two fully independent checks.
Costs on top of the repair
| Item | Range | Source |
|---|---|---|
| Structural engineer report | $500 to $3,000 | HomeGuide (Feb 2026)[1] |
| Structural engineer report | $300 to $2,000 | Fixr (Jan 2026)[4] |
| Structural engineer report | $500 to $1,000 | This Old House / Angi (Mar 2026)[5] |
| Foundation inspection | $400 to $750 | HomeGuide (Feb 2026)[1] |
| Permit | $75 to $150 | HomeGuide (Feb 2026)[1]; Fixr (Jan 2026)[4] |
| Budget for surprises (roots, old repairs, utilities) | $1,000 to $2,500 | HomeGuide (Nov 2025)[2] |
Local permit rules can add cost and steps. Two Texas examples:
- Houston requires a permit for foundation repair. For slab-on-grade houses, the permit needs foundation plans from a Texas-licensed engineer showing the location, quantity and type of piers. Fees follow the city schedule plus a $33.56 admin fee and a plan review fee[7].
- San Antonio requires repairs to be designed by, or done under the guidance of, a Texas professional engineer. An Engineer of Record letter is due at application, and the inspection clears only on the engineer's inspection letter[8].
Check your own city. See the Texas, Ohio and Illinois pages for what we could source.
What drives regional spread
- Soil. Expansive clay moves with moisture, and repairs there often need more piers spread around more of the house. Midwest settlement repairs are often more local. See our county soil data.
- Depth to firm soil. Piers are priced partly by depth. Deeper bearing soil means more pipe or more concrete segments.
- Labor and access. Interior piers mean breaking through floors and tile, then patching them.
- Plumbing. Leaks under a slab can drive movement, and lifting a slab can break old pipes. A plumbing test before and after adds cost but can save a second repair[9].
- Pier type. Steel, helical, pressed concrete and drilled piers price differently. See foundation pier cost.
What the price does not cover
The Foundation Performance Association notes that common repair piers in the Houston area are not tied to the grade beams, so they cannot stop a slab from heaving up when clay swells[9]. FPA also calls watering, drainage and root barriers maintenance, not repair[9]. Read your warranty for heave and maintenance exclusions before you sign.
How to compare quotes
- Get the number of piers, the pier type and the price per pier in writing.
- Ask how added piers found mid-job are priced.
- Ask who designed the repair: an independent engineer or the salesperson.
- Ask for a final elevation survey and an engineer's letter after the work.
When to call a pro
- Doors or windows that stick suddenly, along with new cracks in walls or floors.
- A crack in the slab with one side higher than the other.
- Any repair that needs a permit or an engineer's plan, which a structural engineer should design.
- Before you sign any pier contract, so an engineer can check the pier count and layout.
More questions
Does homeowners insurance pay for slab repair?
Usually not, unless a covered event such as a burst pipe or a fire caused the damage [5]. In Texas, some policies carry an optional endorsement for slab damage caused by plumbing leaks. See the Texas page for what that endorsement covers.
Should I pay for my own engineer if the contractor offers a free inspection?
An engineer who works for you, not the contractor, gives you a repair plan you can take to several bidders. Several Texas cities also require engineer involvement for the permit [7][8], so that cost may be unavoidable.
Sources
- How Much Does Foundation Repair Cost? (dated February 6, 2026), HomeGuide. Accessed 2026-10-06.
- Sinking Foundation Repair Cost (dated November 21, 2025), HomeGuide. Accessed 2026-10-06.
- Underpinning Foundation Cost (dated November 26, 2024), HomeGuide. Accessed 2026-10-06.
- How Much Does Foundation Repair Cost? (updated January 27, 2026), Fixr. Accessed 2026-10-06.
- Foundation Repair Cost (updated March 6, 2026), This Old House. Accessed 2026-10-06.
- How Much Do Piers for a Foundation Cost? (updated April 9, 2025), Today's Homeowner. Accessed 2026-10-06.
- Foundation Repair permit (HPWFMO1010), Houston Permitting Center, City of Houston. Accessed 2026-10-06.
- Information Bulletin 172: Residential Foundation Repair (rev. April 7, 2025), City of San Antonio Development Services. Accessed 2026-10-06.
- FPA-RC-01-0: Post Foundation Repair Performance (2004), Foundation Performance Association. Accessed 2026-10-06.
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