You have an engineer's report recommending remediation and three quotes that differ by twenty thousand dollars and propose three different methods. Working out which is appropriate is genuinely hard, because the contractors quoting are also the people selling.
This article explains what each method actually does, when each is appropriate, what questions to ask, and how to compare quotes that are not comparing the same thing.
We buy houses with foundation problems, so we have an interest in the last section. We are not engineers or foundation contractors and nothing here is a recommendation for any property. Get a licensed structural engineer's opinion before you commission work, because they are paid for a judgement rather than for the job.
What you are actually trying to fix
Almost all residential foundation work in Oklahoma addresses one of two things: a foundation that has settled downward because the soil beneath it moved, or lateral pressure pushing a wall inward.
Settlement is by far the more common here, and it is caused by the expansive clay soils covered in our article on why Tulsa houses move. The soil swells when wet and shrinks when dry, and the shrinking is what lets a foundation drop.
The underlying logic of every remediation method is the same: stop relying on soil that moves, and transfer the load to something that does not.
The methods, and what each actually does
Steel push piers
Sections of steel pipe driven into the ground beneath the foundation, using the weight of the house itself as the resistance, until they reach load bearing strata or refusal. Brackets attach the piers to the foundation and the load transfers to them.
Suits: heavier structures, since the method relies on the building's own weight to drive the pier. Situations where competent strata is at a depth reachable by driving.
Watch for: the depth reached varies across a site, which is why quotes sometimes include a per-foot allowance beyond an assumed depth. Ask what happens if the piers go deeper than quoted.
Helical piers
Steel shafts with helical plates, screwed into the ground with a torque motor rather than driven. Torque readings correlate with capacity, so the installer has a measurement of what each pier will carry.
Suits: lighter structures where there is not enough weight to drive a push pier. Situations where verified capacity matters. New construction and additions as well as remediation.
Watch for: generally more expensive per pier than push piers. Ask what torque readings were achieved and whether they are documented.
Concrete or pressed pilings
Cylindrical concrete sections pressed into the ground in a stack. A long established and generally cheaper method.
Suits: situations where the depth to competent soil is modest and the budget is constrained.
Watch for: without a mechanical connection between sections, a stack can shift laterally over time in soils that move. This is the main argument steel pier installers make against it, and they are not disinterested. Ask an engineer rather than a contractor which is appropriate for your soil.
Interior slab piers
Where the middle of a slab has settled rather than the perimeter, piers can be installed through the slab from inside. This means breaking the floor, which is disruptive and affects flooring reinstatement.
Mudjacking and foam lifting
Injecting material beneath a settled concrete slab to lift it. Traditional mudjacking uses a cement based slurry. Polyurethane foam is the modern alternative: lighter, faster curing, smaller injection holes.
Suits: driveways, patios, garage slabs, walkways and porches. Sometimes interior slabs where the structure itself is not the problem.
Watch for: this fills voids and lifts, it does not transfer load to competent strata. Where the underlying cause is ongoing soil movement, it can need repeating. It is generally not a structural remedy for a house.
Drainage and moisture management
Correcting grading, extending downpipes, installing French drains, managing trees, and in some cases foundation watering systems that keep moisture even during drought.
Suits: almost every property, as a first step or alongside structural work.
Watch for: this addresses the cause rather than the symptom, and it is the option with the smallest margin attached, which is why it gets mentioned least. On early or moderate movement an engineer will frequently recommend this and monitoring before anything else.
Lift or stabilise? The question nobody explains
This is the most important thing on this page and it rarely appears in a quote.
Stabilising means stopping further movement. The foundation stays where it is now.
Lifting means attempting to return the foundation toward its original elevation.
Lifting a settled house sounds better and is not always better. Everything attached to the foundation has adjusted to its current position over decades.
Lifting can open cracks that had closed, disturb plumbing under the slab, crack tile and drywall, and put doors and windows out of square in new ways. On a house that has been stable for years at its current position, an engineer may specifically recommend stabilising rather than lifting.
Ask every contractor directly: are you proposing to lift or to stabilise, and how much movement do you expect to recover? A quote that promises full recovery on a house that settled over forty years is worth questioning.
Comparing quotes that are not comparable
Three quotes on the same house frequently propose different pier counts, different methods and different scopes. Comparing the totals tells you almost nothing.
Ask every contractor the same questions
- How many piers, at what spacing, and why that number?
- Which method, and why is it appropriate for this soil?
- Are you lifting or stabilising? How much recovery do you expect?
- What depth are you assuming, and what happens if you go deeper?
- Is the warranty transferable? For how long? What exactly does it cover?
- Who is responsible for reinstating flooring, landscaping and concrete?
- Does the price include an engineer's sign-off afterwards?
- Are permits required and who obtains them?
The pier count question is the most revealing. A quote for eight piers and a quote for twenty on the same house means somebody has a very different view of the problem, and the engineer's report should settle which.
Warranties, and what they are worth
Most foundation contractors offer a warranty, frequently described as lifetime and frequently transferable to a future owner.
Read what it covers. Typically it covers further settlement at the piered locations, which is narrower than it sounds. It generally does not cover settlement elsewhere on the foundation, cosmetic damage from further movement, or plumbing.
Transferability matters at sale and it carries less weight with buyers than sellers hope, covered in our page on selling a house with foundation problems. It also depends entirely on the contractor still existing, which on a twenty year warranty is a real consideration.
Why the engineer comes first
A foundation contractor inspects for free and produces a proposal to do work. Many are entirely reputable. Their assessment is nonetheless produced by somebody whose income depends on work existing.
A licensed structural engineer charges a few hundred dollars for a residential inspection and report, has no financial interest in the outcome, and produces a scope that contractors then quote against. Comparing three quotes against one engineered scope is a completely different exercise to comparing three quotes against each other.
Many engineers will also return afterwards to verify the work was completed to the specified scope, which is worth arranging and worth having documented.
Should you do it before selling?
Our interest is obvious, so here is the arithmetic rather than an opinion.
Structural repair rarely returns its full cost. A buyer looking at a repaired foundation sees a house that had a foundation problem, and prices that perception regardless of the paperwork. The repair also creates its own disclosure trail: the report, the scope, the invoice and the warranty are all material facts.
Where it makes sense: localised movement, modest scope, a higher value property so the spend is a smaller fraction of the sale price, and both the money and several months available.
Where it does not: comprehensive remediation on a property in a lower value market, where the same spend sits against a lower ceiling. That is covered on our pages for Muskogee and Sand Springs, the latter because slopes make the problem worse there than almost anywhere in the metro.
Get the engineer's report and the quotes, establish what the repaired house would realistically sell for using sold comparables, subtract the cost and the months. If the first number is meaningfully higher, repair. Often it is not, and that is when we are worth a conversation.
The short version
Six things worth knowing
- Every method does the same thing: transfer load off soil that moves
- Push piers suit heavier structures, helical piers suit lighter ones and give measured capacity
- Mudjacking and foam fill voids. They are not a structural remedy for a house
- Lifting is not automatically better than stabilising and can cause new damage
- Compare pier counts and scope, not totals. Three quotes rarely price the same job
- Get the engineer first. They are paid for a judgement, not for the work
Frequently asked questions
What do foundation repairs actually do?
Almost all of them transfer the load of the foundation off soil that moves and onto something that does not, either deeper competent strata or bedrock. The methods differ in how they achieve that rather than in the underlying logic.
What are push piers?
Sections of steel pipe driven into the ground beneath the foundation using the weight of the house as resistance, until they reach load bearing strata or refusal. Brackets attach them to the foundation and the load transfers.
What are helical piers?
Steel shafts with helical plates screwed into the ground with a torque motor rather than driven. Torque readings correlate with capacity, so the installer has a measurement of what each pier will carry. They suit lighter structures.
Which is better, push or helical?
Neither universally. Push piers rely on the building's weight, so they suit heavier structures. Helical piers work where there is not enough weight to drive a push pier and give verified capacity. Your engineer should specify which is appropriate.
What about concrete pilings?
A long established and generally cheaper method using pressed concrete sections. The main concern raised against them is lateral shift over time without a mechanical connection between sections. Ask an engineer rather than a contractor, since contractors are not disinterested.
Is mudjacking a foundation repair?
Generally not for a house. It fills voids and lifts a slab rather than transferring load to competent strata, so where ongoing soil movement is the cause it can need repeating. It suits driveways, patios, garage slabs and walkways.
What is polyurethane foam lifting?
The modern alternative to mudjacking. Lighter material, faster curing, smaller injection holes. Same principle and same limitation: it fills and lifts rather than transferring load.
What is the difference between lifting and stabilising?
Stabilising stops further movement and leaves the foundation where it is. Lifting attempts to return it toward its original elevation. Lifting sounds better and is not always better.
Why can lifting cause problems?
Because everything attached to the foundation has adjusted to its current position over decades. Lifting can open cracks that had closed, disturb plumbing under the slab, crack tile and drywall, and put doors and windows out of square in new ways.
How do I compare quotes that differ wildly?
Not by total. Ask every contractor the same questions: pier count and spacing and why, which method and why for this soil, lifting or stabilising, assumed depth and what happens if deeper, warranty terms, and who reinstates flooring and concrete.
Why do pier counts differ so much between quotes?
Because somebody has a very different view of the problem. It is the most revealing difference between quotes, and an engineer's report should settle which view is correct rather than leaving you to guess.
Should I get an engineer before a contractor?
Usually yes. An engineer charges a few hundred dollars, has no financial interest in the outcome, and produces a scope contractors then quote against. Comparing three quotes against one engineered scope is a different exercise to comparing them against each other.
What does a foundation warranty actually cover?
Typically further settlement at the piered locations, which is narrower than it sounds. It generally does not cover settlement elsewhere on the foundation, cosmetic damage from further movement, or plumbing. Read the actual document.
Is a transferable warranty worth much at sale?
It carries some weight and less than sellers hope. It also depends on the contractor still existing, which on a twenty year warranty is a real consideration rather than a technicality.
Do I need a permit for foundation work?
It depends on the jurisdiction and the scope. Ask each contractor whether permits are required and who obtains them, and confirm with your city or county building department rather than taking the contractor's word alone.
Will drainage work fix it on its own?
On early or moderate movement it frequently helps substantially, because it addresses the cause rather than the symptom. It is also the option with the smallest margin attached, which is why it is mentioned least by people selling remediation.
How long does the work take?
It depends entirely on scope. A handful of exterior piers is measured in days. Comprehensive remediation with interior piers and slab work is longer and considerably more disruptive, potentially making the house difficult to occupy.
Who reinstates my floors and landscaping?
Ask explicitly, because it varies and it is a real cost. Some quotes include reinstatement and many do not, which is one reason totals are not comparable between contractors.
Should I repair before selling?
Where movement is localised, the scope modest, the property higher value, and you have both the money and several months, frequently yes. Where remediation is comprehensive and the market lower value, the spend often does not come back.
Does repairing remove the disclosure obligation?
No. The engineer's report, the scope, the invoice and the warranty all become material facts. You spend the money and still have the conversation, which is one of the main reasons repair rarely returns its full cost.
Will you buy a house that has already had foundation work?
Yes, and send us the documentation. An engineer's report, the scope of work and any warranty are all useful and more accurate than our own estimate from a walkthrough. Having had work done does not count against you with us.
Will you buy one that has not been repaired?
Yes, and that is more common. There is no lender and no appraisal in our purchase, so the chain that kills financed sales does not start. The remediation cost goes into the repair estimate we hand you with the offer.
We buy houses with foundation problems, so we have an interest in the last section. We are not engineers or foundation contractors and nothing here is a recommendation for any property. Get a licensed structural engineer's opinion before you commission work.