Before You Even Ask for References
Some prep work has to happen before you call the references the contractor gives you. The references themselves are only one signal. They have to be evaluated alongside license verification, insurance verification, and basic business research that you can do online in twenty minutes. Skipping these steps means you are doing reference calls in a vacuum, where you cannot tell whether the contractor is a legitimate business with a hiccup or a fly-by-night operation that just happens to have a couple of happy customers from a year ago.
I usually do this prep before the contractor even hands over the reference list, so that when I get the names I am ready to call right away. The longer you wait between getting references and actually calling them, the easier it is to lose momentum and just sign the contract.
Verify the License Independently
Most states require foundation repair contractors to hold a general contractor or specialty license. Do not trust the laminated license card the salesperson shows you. Go directly to your state's licensing board website and search by the company name or license number. In Ohio, that means the Ohio Construction Industry Licensing Board. Other states have similar online portals.
What you are looking for is an active license in good standing, no recent disciplinary actions, no consumer complaints filed within the past several years, and a license type that actually authorizes the work being quoted. A few states draw fine distinctions between general residential contractors and structural specialty contractors, and the wrong license type could affect your warranty and your insurance.
Verify Insurance
Ask the contractor for a certificate of insurance issued directly from their insurance company to you as a third-party verifier, not a photocopy of a certificate they hand you in person. This is a standard request and any reputable contractor will arrange it without complaint. Confirm both general liability coverage and workers compensation coverage, since work happening on your property exposes you to liability if either is missing.
I also like to check whether the policy explicitly covers foundation work. Some general liability policies exclude structural work or have lower sub-limits for excavation and underpinning. The certificate of insurance will note any major exclusions.
Asking for the Right References
When you ask for references, do not just say can I have three references. Be specific. The contractor will hand you their best three customers no matter what you ask. You want references that match your situation closely enough that the comparison is useful.
I usually ask for three local references where the contractor performed the same type of repair I am being quoted on, within the past twenty-four months, in homes of roughly similar age and construction. So if I am being quoted on wall anchors for a 1980s block foundation, I am asking for three recent wall anchor jobs on similar block walls in the same general region. Not slab pier installations on 1950s ranches, which the contractor might have also done but tell you nothing about how this specific type of work goes for this specific contractor.
What to Do If They Cannot Produce Specific References
A legitimate contractor doing volume in your area should have no trouble producing three references that match your specific repair type from the past two years. If they hedge or hand you references from five years ago, or from a different state, or for completely different work, treat that as significant data. It either means they have not been doing much of your specific repair type recently, or it means their recent customers are not happy enough to be willing to serve as references.
This is one of the clearer red flags in the whole process and I have walked away from contractor quotes specifically for this reason.
Questions That Actually Get You Useful Information
This is the section most homeowners get wrong. Asking a reference whether they were happy with the work produces almost no signal. Most people will say yes out of social politeness even if they have lingering concerns. You need questions that pull out specific factual information that lets you compare what you are being told by the contractor against what the customer actually experienced.
Here are the questions I actually use. I write them down before the call and check them off as I go so I do not freeze up or forget anything important.
Questions About the Original Diagnosis
How did the contractor describe the problem to you originally? Did they recommend the most expensive option or did they walk you through alternatives? Did anyone else evaluate your foundation before you signed with this contractor, and did the other opinion match? This is where you find out whether the contractor tends to over-prescribe expensive solutions or whether they offer measured recommendations.
Questions About the Work Itself
How long did the work take compared to what they quoted you? Did the crew show up when they said they would? Were there change orders or surprise charges, and if so, how were they handled? Did the work area get left clean at the end of each day? How disruptive was the work to your daily life? These questions surface organizational and operational issues that are common with smaller or overextended contractors but are hard to detect from a sales meeting.
Questions About the Warranty Experience
This is the most important set of questions and the one most homeowners forget. Has anything gone wrong since the work was completed? If yes, how did the contractor respond? Did they return calls promptly? Did they honor the warranty without arguing? How long did the resolution take? A contractor's behavior during a warranty claim tells you more about their actual character than ten sales conversations. References whose work happened twelve to eighteen months ago are the most useful here because that is enough time for any latent issues to have appeared.
Drive Past One of the Properties
This step feels excessive until you do it once and realize how much you can learn. Pick one of the reference properties that is reasonably close to you and drive past it. You are not trespassing, you are not bothering the homeowner, you are just looking at the outside of the house. What you can usually see is whether there is any visible exterior evidence of recent excavation around the foundation, whether the landscaping was restored or left messy, and whether any cosmetic exterior work was done well or badly.
I drove past one reference property when I was helping my brother evaluate a contractor in Cincinnati a few years ago, and the exterior of the house had a strip of bare clay running along the entire foundation where the contractor had clearly never finished the soil restoration after a pier installation eighteen months prior. The reference had said on the phone that the work was fine. Maybe it was, structurally. But the contractor had not bothered to come back and finish the yard, which is the kind of detail that tells you something about how they will treat you after the check clears.
Cross-Check What the Contractor Told You
After you have called the references and ideally driven past one property, sit down with the original contractor quote and your notes from the sales meeting and compare them to what the references actually said. Specifically look for any factual claims the contractor made that the references contradict.
If the contractor told you wall anchors take two days and the reference said it took five, that is not necessarily disqualifying but it is data. If the contractor told you they always restore the landscaping and the drive-by showed bare clay, that is a bigger problem. If the contractor described their warranty as transferable to future owners and the reference says their attempt to transfer it was denied, that is a serious issue worth raising before signing.
The point is not to catch the contractor in trivial errors. The point is to see whether the picture the salesperson painted matches the experience the customer actually had. When those two pictures match closely, that is a good sign. When they diverge significantly, you need to either ask follow-up questions or move on to another contractor.
When to Trust the Process and When to Walk Away
Reference checking is not a guarantee. A contractor with three glowing references can still mess up your job. A contractor with mediocre references might do excellent work on your property. What reference checking does is shift the odds. It catches the worst contractors before they get a check from you, and it gives you a clearer-eyed view of who you are about to work with.
If three references all confirm a consistent story that matches what you were told, license and insurance check out, and the drive-by looks clean, you have done your part. Sign with confidence. If anything in the process feels off, if references are evasive, if the contractor pushes back on letting you verify anything, or if the drive-by reveals issues nobody mentioned, you have just saved yourself a lot of money by being patient enough to do this work before signing. That is the whole game.