Des Moines, IA · Polk County · USDA soil survey 2026-08-28
Foundation repair in Des Moines, IA: what the soil says, what it should cost
The soil under Polk County is mostly well drained; shrink-swell is low (LEP 2.71%), so Des Moines foundation problems are usually water and pressure, not expansive clay. Published national ranges put a typical repair at $2,224–$8,134, piers at $1,000–$3,000 each. Check the soil under your own address below; then read what an independent engineer costs before you sign.
- Well drained soil
- 141 map units with data
- Every price cited
- No contractor rankings
How much do basement waterproofing and foundation repair cost in Des Moines?
We do not have Des Moines-specific price data and won't invent an “average for Des Moines.” What published national guides report, with the figures the guides themselves publish:
- Typical job: $2,224–$8,134, average $5,179. Source: This Old House — Foundation Repair Cost, updated 2026-03-06
- Piering / underpinning: $1,000–$3,000 per pier. Source: This Old House — Foundation Repair Cost, updated 2026-03-06
The pier count and depth move a Des Moines number, and they depend on the soil under that specific house and how far down stable material sits. On this soil, the cheaper fixes (drainage, grading, leak repair) are more often the right answer than a pier plan.
| Repair | Published range | Source |
|---|---|---|
| Crack repair (epoxy / polyurethane injection) | $250–$800 per crack | Bob Vila — How Much Does Foundation Repair Cost?, updated 2024-05-29 |
| Wall stabilization / reinforcement (carbon fiber or steel, ~12 strips) | $4,000–$12,000 per job | This Old House — Foundation Repair Cost, updated 2026-03-06 |
| Bowed wall repair (all methods) | $5,000–$15,000 per job | Bob Vila — How Much Does Foundation Repair Cost?, updated 2024-05-29 |
| Foundation sealing / waterproofing | $2,300–$7,300 per job | This Old House — Foundation Repair Cost, updated 2026-03-06 |
| Drainage system | $2,800–$6,500 per job | Bob Vila — How Much Does Foundation Repair Cost?, updated 2024-05-29 |
Holding a Des Moines quote? Read it against the Polk County soil record before you sign.
What the soil under Polk County does
Source: USDA NRCS SSURGO, county legend IA153, top 152 cm, weighted by mapped acreage. Coverage: 90% of mapped acres carry usable data across 141 map units. Built 2026-08-28.
- very high0%
- high2%
- moderate28%
- low70%
Drainage class (acre-dominant): Well drained. Hydrologic group: B (D = slowest infiltration, highest runoff). Water table (annual minimum depth, cm): 150. Flooding: None.
The largest mapped unit in Polk County is Clarion loam, Bemis moraine, 2 to 6 percent slopes (14% of surveyed acres, low, LEP 1.89%, well drained); next is Webster clay loam, Bemis moraine, 0 to 2 percent slopes at 9%, low with LEP 2.86%.
Where the expansive soil is: largest map units in Polk County
The hyper-local view: Des Moines neighborhoods sit on different ground, and the address lookup tells you which unit is under a given house.
| Map unit | Share of surveyed acres | LEP | Class | Drainage |
|---|---|---|---|---|
| Clarion loam, Bemis moraine, 2 to 6 percent slopes | 14% | 1.89% | low | Well drained |
| Webster clay loam, Bemis moraine, 0 to 2 percent slopes | 9% | 2.86% | low | Poorly drained |
| Nicollet loam, 1 to 3 percent slopes | 9% | 2.1% | low | Somewhat poorly drained |
| Canisteo clay loam, Bemis moraine, 0 to 2 percent slopes | 8% | 2.2% | low | Poorly drained |
| Clarion loam, Bemis moraine, 6 to 10 percent slopes, moderately eroded | 4% | 1.5% | low | Well drained |
| Coland clay loam, 0 to 2 percent slopes, occasionally flooded | 3% | 3.79% | moderate | Poorly drained |
| Dockery-Quiver silt loams, 0 to 2 percent slopes, occasionally flooded | 3% | 2.65% | low | Somewhat poorly drained |
| Clarion-Urban land complex, 2 to 5 percent slopes | 3% | 0.82% | low | Well drained |
| Spillville-Coland complex, channeled, 0 to 2 percent slopes | 3% | 3.57% | moderate | Moderately well drained |
| Clarion-Urban land complex, 5 to 9 percent slopes | 2% | 0.82% | low | Well drained |
Check the soil under an address
USDA soil survey, read for the top 60 inches under the address. Free, no account, nothing is sent to a contractor.
Usually 1–3 seconds. The USDA service occasionally takes longer.
Is it worth waterproofing a basement in Des Moines? Do you actually need this?
Around here the soil story is water, not swelling clay: seasonally high water tables and slow drainage push water and pressure against basement walls.
- Wet basement quotes split into drainage/waterproofing (thousands) and wall stabilization (more). Make sure you know which one you're being quoted.
- Bowing walls are structural and deserve an engineer's measurement; damp walls usually don't.
- Interior drain-and-sump systems and exterior grading fix most water problems; carbon-fiber or steel is for walls that have actually moved.
We are not engineers and this is not an engineering opinion. We report public soil-survey data and published price ranges. Nothing here states that a specific house is or is not structurally sound; a licensed structural engineer who has seen the house can.
Does homeowners insurance cover basement waterproofing or foundation repair in Iowa?
Usually no. Standard homeowners policies exclude earth movement (settling, shrinking, expanding and cracking of the foundation), so damage from expansive soil is not covered. Damage that results from a covered sudden event, such as a burst pipe flooding under a slab, can be, and separate earthquake or flood policies cover those perils.
Full answer for Iowa → Source: HO-3 Special Form policy text (exclusion: "settling, shrinking, bulging or expansion, including resultant cracking, of pavements, patios, foundations, walls, floors, roofs or ceilings"), as filed with the Oklahoma Insurance Department
Finding a structural engineer in Des Moines for an independent opinion
A contractor's free inspection produces a bid. A licensed structural engineer who does not sell repairs produces the scope that bid should be written to: whether movement is active, what is causing it, and the pier count and depth if any. Published cost: $300–$1,000. Source: Bob Vila — How Much Does Foundation Repair Cost?, updated 2024-05-29
People in Des Moines search for a structural engineer about 110 times a month, more than they search for a “foundation inspection” (0). Verify a license with the Iowa board; what the report should contain →
Foundation repair types people in Des Moines search for
Monthly Google searches for each phrase with “Des Moines” attached (Google Ads, pulled 2026-08-28). Each links to the cited cost range and when that repair is the right one.
- Basement waterproofing in Des Moines, about 90/mo: gutters, downspouts and grading before any system; interior drain and sump on slowly drained soil.
- Crawl space repair in Des Moines, about 10/mo: water first, then framing and piers; encapsulation only once it is dry from outside.
Finding and comparing foundation repair companies in Des Moines
Google shows a map pack of 3 contractors for “foundation repair Des Moines”; we don't rank them and don't take money to list them. A good bid and an aggressive one differ in scope, not in company name, so get the engineer's scope first and have every Des Moines company bid to it. On this soil drainage is usually the fix, and a bid with no drainage line is incomplete. What a comparable quote itemizes →
Des Moines foundation repair: questions people ask
How much does foundation repair cost in Des Moines?
We don't have Des Moines-specific price data. Published national figures put a typical job at $2,224–$8,134 (average $5,179); piers run $1,000–$3,000 each, and the pier count is what moves a Des Moines quote.
Does homeowners insurance cover foundation repair in Iowa?
Usually no. Standard homeowners policies exclude earth movement (settling, shrinking, expanding and cracking of the foundation), so damage from expansive soil is not covered. Damage that results from a covered sudden event, such as a burst pipe flooding under a slab, can be, and separate earthquake or flood policies cover those perils.
Is it worth waterproofing a basement in Des Moines? Do I actually need it?
Around here the soil story is water, not swelling clay: seasonally high water tables and slow drainage push water and pressure against basement walls.
What is the cheapest way to waterproof a basement in Des Moines?
Start outside: gutters, downspout extensions and grading away from the wall are the cheapest interventions and are where most water comes from. An interior drain and sump is the durable fix on slowly drained soil (hydrologic group C/D), and exterior excavation is the most expensive option. Price them in that order.
Will insurance pay for basement waterproofing?
Almost never as a preventive job. Usually no. Standard homeowners policies exclude earth movement (settling, shrinking, expanding and cracking of the foundation), so damage from expansive soil is not covered. Damage that results from a covered sudden event, such as a burst pipe flooding under a slab, can be, and separate earthquake or flood policies cover those perils.
How do I compare foundation repair companies in Des Moines?
Get an independent engineer's report first, then have every company bid to that scope: same pier type, count and depth. Compare the warranty terms (transferable? covers the house or only the pier?) and the moisture plan, not the sales pitch. We don't rank contractors.
Where do I get an independent opinion in Des Moines?
A licensed structural engineer who is not selling the repair. A report costs about $300–$1,000 and specifies whether movement is active and what work, if any, is warranted.
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