Slab Foundation Repair in Oklahoma City

The short answer

A slab that dropped at the edge during a dry spell is usually a piering job, paired with gutter or grading work so it does not happen again. A slab that rose in the middle after a wet spell or a plumbing leak is a water job first. Piers lift low spots. They do not pull a high spot back down.

Published prices run from about $1,000 to $10,000 for slab repair (HomeGuide) up to $15,000 to $30,000 or more for severe failure or full underpinning (Olshan Foundation Repair, a national contractor). Most of the spread is pier count: Olshan says most slab jobs need 5 to 15 piers.

A floor measurement tells you which one you have. A local foundation specialist can take one on a free visit and tell you whether the slab needs piers at all.

How slabs fail on Oklahoma City clay

A slab house sits on one poured concrete pad with a thicker beam around the edge. Under much of the metro is expansive clay, which shrinks as it dries and swells when wet. During the 2011 drought, University of Oklahoma geotechnical engineer Gerald Miller described what that does to a slab: picture a sheet of paper with its edges bent down (quoted in The Oklahoman).

The ground under the slab moves unevenly and the slab bends to follow. There are three patterns, and each has a different fix.

Edge drop in a drought

Soil at the edge of the house dries faster than soil under the middle, because it is exposed to the weather and to tree roots. When it shrinks, the perimeter beam sinks while the center stays put. Engineers call this center lift or edge drop. Texas A&M engineer Robert Lytton, presenting to the Foundation Performance Association, named trees as a main cause of edge drying and said the zone of moving soil can run 3 to 20 feet deep when a tree is present.

This is a drought year. As of October 20, 2026, the US Drought Monitor had all of Oklahoma County in severe drought (D2) or worse. So far 2026 has logged 34 weeks with at least half the county in D2 or worse, the most since 2011 (39 weeks). 2006 had 41. More on that in drought and your foundation.

Edge heave after a wet spell

The reverse happens when the perimeter gets wetter than the middle, as with a wet spring after a dry year or a downspout dumping water beside the wall. The edge swells and rises. Lytton lists overwatering and poor drainage as the usual causes of edge wetting. The same house can do both, dropping in a dry summer and rising again after a wet spring.

Center heave from a leak

A water or sewer line leaking under the slab can soak the clay in the middle of the house. Olshan notes that plastic pipes under slabs are stressed as expansive clay swells and shrinks, which can crack them, and that a leak under a slab can make the area around it heave.

This pattern is the one piers do not fix. The US military's design manual for foundations on expansive soils (UFC 3-220-07, formerly Army TM 5-818-7) says repairing a heaved area often requires raising the whole unheaved part of the slab up to the level of the high spot. That is a big job, so the first step is finding and stopping the water. Our page on slab leaks and foundation damage covers leaks in more detail.

Where you live changes the odds

Our ZIP-level data, built from the USDA NRCS soil survey, puts 69 to 84% of the land in south and west-central Oklahoma City (73159, 73139, 73119, 73120, 73162) on high shrink-swell clay. The east side is different. Choctaw (73020), Harrah (73045) and Midwest City (73130) sit mostly on sandy Stephenville and Harrah soils with low shrink-swell, so a moving slab there more often points to one specific water source.

You can check your own street before anyone comes out.

Signs your slab is moving

Movement usually shows up in walls and doors before you see it in the concrete. Olshan and the OU article list these:

• Diagonal drywall cracks running from the corners of doors and windows
• Doors that stick or will not latch
• Gaps between interior walls and the ceiling or floor
• Floors that slope or dip
• Cracks in floors or exterior brick

Olshan treats cracks wider than 1/4 inch and floors sloping more than 1 inch over 10 feet as signs of a larger problem. One door that sticks every August is weak evidence on its own. Three sticking doors and a brick crack on the same corner of the house is a pattern. Our list of signs of foundation problems explains what each one usually means.

If you have a crack you are unsure about, a photo is enough for a first opinion.

The repair options

A pier is a column installed under the perimeter beam that carries the load down to steadier soil. It usually also lets the contractor lift the slab back toward level. These are the options that show up on Oklahoma City slab estimates, with Olshan's published prices where it lists one:

Method	How it works	Published price
Pressed concrete piers	Short concrete cylinders stacked and pushed into the ground with a hydraulic jack until they stop moving	Not on Olshan's list; ask for a per-pier price
Steel push piers	Steel pipe sections driven down using the weight of the house as the counterforce	$990 to $1,350 per pier
Helical piers	Steel shafts with screw-shaped plates turned into the soil	$3,500 to $4,400 per pier
Drilled piers	A hole drilled under the beam and filled with concrete	$765 to $1,100 per pier
Slabjacking (mudjacking)	Cement grout pumped through holes drilled in the slab to fill voids and lift low sections	$5,000 to $10,800 per job
Polyurethane foam injection	Expanding foam injected under the slab, lighter than grout	$4,500 to $11,500 per job

Which one fits

On high-swell clay the case for steel push piers is depth. The aim is to get below the layer that wets and dries every season, and steel can usually be driven deeper than pressed concrete before it stops. Pressed concrete costs less. If an estimate uses it, ask how deep each pier is expected to go and what happens if one stops shallow.

Helical piers run about three times the price of push piers on Olshan's list. They make sense where a push pier cannot get enough resistance, such as a lighter garage or addition. On a heavy brick house, ask for the specific reason before paying for helicals.

Slabjacking and foam are for the interior slab. They fill a void under a sunken section of floor and lift it, but they do not reach deeper soil, so they do nothing to stop the perimeter beam from moving. UFC 3-220-07 describes repair of a damaged slab as a combination of underpinning and mudjacking with cement grout. In practice: piers for the edge, injection for low spots inside. Our foundation piering guide goes further into pier types.

Water control comes first

Piers on a house that still has a downspout emptying against the beam are a poor use of money. Colorado State University Extension, writing about expansive clay, recommends:

• Grading the yard so water drains away from the house
• Keeping sprinkler spray at least five feet from the foundation
• Planting trees at least fifteen feet from the foundation
• Leaving downspout extensions in place

Olshan lists drainage correction with regrading at $2,800 to $8,000. A French drain is one option where the yard slopes toward the house.

What it costs

These are published ranges from cost guides and a contractor's own price list, not quotes:

Job	Published range	Source
Concrete slab repair	$1,000 to $10,000	HomeGuide
Underpinning, a few piers for limited repairs	$2,000 to $12,000	HomeGuide
Underpinning, major projects	$10,000 to $30,000 or more	HomeGuide
Severe failure or full underpinning	$15,000 to $30,000 or more	Olshan
Residential structural engineer report	$499 to $780	Olshan
Structural engineer report	$500 to $3,000	HomeGuide

Say an inspection calls for 8 steel push piers along one side of the house. At Olshan's per-pier range that is $7,920 to $10,800, before drainage work or interior patching. Switch the same 8 piers to helicals and the pier line alone becomes $28,000 to $35,200. Pier type and count drive the total, so ask for the reason behind both. The full breakdown is in our foundation repair cost guide.

What a written estimate should spell out

Get at least two, and line them up against this list:

1. A floor elevation map. Readings across the house showing high and low points. It shows edge drop versus heave and gives you a before picture to check the lift against.
2. The diagnosis. Did the slab sink or heave, and why? If the contractor says heave and the estimate is all piers, get a second opinion.
3. Pier type and count, with a drawing showing where each pier goes.
4. Depth. How deep each pier is expected to go and what decides when to stop.
5. Per-pier price and what it includes (digging, brackets, backfill, haul-off).
6. The lift target, in inches or as a tolerance.
7. A plumbing test before and after lifting, and who pays if a line is damaged.
8. Interior work: breaking through flooring, and who patches it.
9. Drainage. Included or priced separately. If it is missing, ask why.
10. Warranty terms in writing, including whether they transfer to a buyer.

If two contractors disagree about whether your slab sank or heaved, that is the moment to pay for an independent engineer, who has no piers to sell. See structural engineer inspections and choosing a foundation repair company.

When it is not a structural problem

A lot of slab cracks are just concrete. Concrete shrinks as it cures, and BuildingAdvisor says a slab crack of 1/8 inch or less is typically a normal shrinkage crack and not a cause for concern. The ones to watch are cracks that keep getting wider, or where one side sits higher than the other. BuildingAdvisor says an offset like that should be looked at by a structural engineer.

Olshan's own list of cases where prevention may be enough includes hairline cracks only, minor seasonal door sticking, and settlement under 1 inch that has stopped. In those cases the right answer may be water control alone.

A sunken patio or driveway is usually a concrete problem, unless it is pulling away from the wall or its cracks line up with cracks in the house. For the simple version, see concrete leveling.

If you are still not sure which side of the line you are on, the symptom checker sorts it out in about a minute.

Getting the slab measured

The expensive mistake on Oklahoma City clay is paying for piers on a slab that heaved, or for slabjacking on a beam that is still dropping. A floor elevation map from an on-site visit settles which one you have. A local foundation specialist can take those readings for free and put the scope in writing, even when the answer is gutters and grading instead of piers.