How to Vet a Contractor Before You Sign Anything

October 24, 2026 · Real renovation and flip numbers, start to finish

Public domain, via Wikimedia Commons

Most bad contractor experiences don't start on day one of the job. They start at the bid stage, when a homeowner skips the boring verification work because the guy seemed nice and the price was right. By the time the problems show up, the deposit is spent and the contract is signed. Here's what to actually check before you hand over any money.

What the problem actually looks like

You've seen the pattern even if you haven't lived it. A contractor shows up on time for the first two visits, then starts missing days. Change orders appear for things that should have been caught in the original walkthrough. The crew on site isn't the crew that bid the job. Draws get requested ahead of the work completed. Then one day the job stalls for two weeks with no explanation, and you realize you don't actually know this person's license number, insurance status, or legal business name.

None of this is rare. It's the single most common complaint in renovation forums and small claims filings: not that the work was bad, but that the vetting never happened in the first place.

Why it happens

Homeowners are usually hiring for the first time or the first time in years, and they're comparing bids on price and gut feeling because that's what they have. Contractors know this. A general contractor's actual skill at running a crew, managing subs, and pulling permits correctly is invisible in a kitchen conversation. It only shows up once money has changed hands.

There's also a volume problem. Good, busy contractors are hard to reach and slow to bid, because they're actually working. The contractors with the fastest callback times and the lowest bids are sometimes just better at sales than at building. That's not always true, but it's true often enough that speed and charm are bad proxies for competence.

Finally, licensing and insurance requirements vary a lot by state and even by county, so there's no single national standard a homeowner can rely on. That gap is exactly where unlicensed or underinsured operators work.

What we do about it

This is the actual sequence, not a theoretical one. It takes a few hours spread across a week, and it's worth every minute of it.

• Verify the license directly. Don't take a license number off a business card as proof. Look it up on your state contractor licensing board's website. Check that it's active, matches the business name on the bid, and has no disciplinary history. If your state doesn't license general contractors (some don't), check municipal registration instead.
• Get proof of insurance, not a claim of insurance. Ask for a certificate of insurance showing general liability and workers' comp, with your name and project address as the certificate holder. Call the insurance agent on the certificate to confirm it's current. This step alone screens out a surprising number of operators.
• Check for a physical business presence. A real office, a few years of registered business history, a working landline. Not a dealbreaker on its own if missing, but it's a data point.
• Call at least three references, and ask about the boring stuff. Not "were they nice" but "did they finish on the date in the contract," "did the final price match the bid," and "would you let them back into your house." Ask for one reference from a job completed over a year ago, so you can see how the work held up, not just how clean the crew left the site.
• Look up past permits. Many counties have an online permit search. Pull the contractor's license number and see what they've pulled permits for in the last two years. If they claim a dozen kitchen remodels but you find three permits, ask why.
• Check for liens and complaints. A search of your county's mechanic's lien records and the state licensing board's complaint history takes ten minutes and tells you things no reference call will.
• Read the contract like it's the only protection you have, because it is. It should specify scope of work, materials by brand and model where it matters, payment schedule tied to completed milestones (not calendar dates), a start and substantial-completion date, and a clear change order process. Avoid any contract that asks for more than 10-30% down, depending on your state's legal cap on deposits, many states cap it around 10%.
• Get three bids, but don't just take the lowest. A bid that's 30-40% below the others usually means missing scope, lower-grade materials, or a contractor who's going to come back asking for more money once the walls are open.

None of this guarantees a smooth job. It filters out the contractors most likely to cause expensive problems, and it gives you documentation if something does go wrong.

What it costs to ignore

Skipping this process doesn't usually blow up on a small job. It blows up on the bigger ones, where the money and the stakes are higher. An unlicensed or underinsured contractor who gets a worker hurt on your property can leave you exposed to that worker's medical costs if your homeowner's insurance doesn't cover it, and many policies have exclusions for uninsured contractor work. A contractor who disappears mid-job with a deposit can cost you the deposit itself (often $2,000 to $15,000 depending on job size) plus the cost of hiring someone else to finish, usually at a premium because now the work is half-done and messy to take over. Unpermitted work discovered at resale can force you to open up finished walls for inspection, which on a mid-size renovation can run several thousand dollars in rework, on top of delaying your closing.

The vetting itself costs almost nothing. A few phone calls, a few website searches, maybe an hour on a Saturday. Compare that to the cost of redoing a botched renovation and it's not a close call.

FAQ

Should I ever hire someone without a license if the price is good?

For small, cosmetic jobs with no structural, electrical, or plumbing work, some states don't require a license at all, so this may not even apply. For anything involving permits, structure, or life-safety systems, no. The license requirement exists because mistakes in those areas are expensive and sometimes dangerous, and an unlicensed contractor has no regulatory accountability if something goes wrong.

How many references are actually enough?

Three is a reasonable minimum, but ask the contractor for five and pick which three to call yourself rather than letting them hand-pick. A contractor who only offers one or two recent references, or gets cagey about contact info, is worth a second look. We've covered a few flips on Fixer Files where the contractor vetting step was the entire difference between the renovation hitting budget and blowing past it by 20%.