15 Contractor Red Flags — Warning Signs to Walk Away Before You Sign

Bad contractors exist on a spectrum — from incompetent but well-intentioned to outright fraudulent. Either end of that spectrum costs you money, time, and stress. The good news is that bad contractors almost always reveal themselves before you sign, if you know what to look for.

Here are 15 red flags to watch for during the hiring process.

1. No License, or a License That Doesn't Match the Scope

Every state requires contractors to be licensed for the work they do. A general contractor license allows general construction management. Specialty work (electrical, plumbing, HVAC) requires separate trade licenses.

Before you meet with anyone, look them up on your state's contractor licensing board website. Verify:

License is active (not expired, suspended, or revoked)
License classification covers the work you are hiring for
The person you are meeting is the licensee or an authorized representative of the licensed entity

An unlicensed contractor is not just legally problematic for them — your homeowner's insurance may deny claims for damage caused by unlicensed work, and you may be liable for injuries on your property.

2. No Insurance, or Insurance That Cannot Be Verified

Every contractor working on your property should carry:

General liability insurance ($1M minimum per occurrence)
Workers' compensation (required if they have employees)

Do not accept a verbal assurance. Request a Certificate of Insurance (COI) directly from them, then call the insurance company to verify the policy is current. Certificates can be fabricated or outdated. A 5-minute phone call confirms it.

If a worker is injured on your property and the contractor has no workers' comp, you may be liable for the injury claim.

3. A Large Upfront Deposit Request

A legitimate contractor with good cash flow and credit does not need a large deposit to start your project. They have supplier accounts and working capital.

Standard deposit: 10% or less of the total contract value. Many states have laws capping contractor deposits — California limits them to $1,000 or 10%, whichever is less. Even in states without hard caps, a large upfront payment is a financial risk signal.

A contractor asking for 30-50% upfront is either:

Poorly capitalized (a business risk)
Planning to use your money to pay off debts from other projects (a fraud signal)
Planning to disappear with your money (the worst case)

Once money is gone, recovering it from a dishonest contractor is slow, expensive, and often unsuccessful.

4. Only a Verbal Estimate, or a Lump Sum With No Detail

"Kitchen remodel, all materials and labor — $68,000" is not an estimate you can evaluate. It tells you nothing about what is and is not included, what materials are being used, or how the work will be structured.

A professional estimate includes:

Line-by-line scope of work
Materials specified by brand, model, or grade
Exclusions explicitly listed
Payment schedule tied to milestones
Timeline

If a contractor refuses to provide detail or says "trust me," move on. Vague estimates protect the contractor, not you.

5. Pressure to Sign Immediately

"This price is only good today" or "I have another job that will take this slot if you don't commit now" are pressure tactics designed to prevent you from doing due diligence.

Legitimate contractors understand that a $50,000 renovation is a significant decision. They do not pressure you to sign in an hour. If a contractor is applying significant pressure to sign before you have had time to review the estimate, check their license, verify their insurance, and talk to references — walk away.

6. No References, or References Who Won't Talk

Ask for three references from projects completed in the last 12 months. Not three years ago — 12 months. Construction businesses change fast, and a contractor who was excellent three years ago may have different staff, financial problems, or quality issues today.

If a contractor cannot provide three recent references, that is a problem. If they provide references who are difficult to reach, give vague answers, or sound coached — pay attention to that.

When you call references, ask:

Was the project finished on time?
Was the final cost close to the estimate?
Did they communicate proactively when problems came up?
Would you hire them again for a similar project?

The last question is the most revealing. Anything other than an enthusiastic "yes" tells you something.

7. No Physical Business Address

A contractor should have a verifiable business address — not just a cell phone and a Gmail account. Check:

Their website (does it look like a legitimate business?)
Google Business listing (do they have reviews? When was the listing created?)
BBB profile
State licensing board (the address on record should be real)

Contractors who operate exclusively from personal cell phones with no verifiable address are harder to find if something goes wrong.

8. Quoted Price Is Dramatically Lower Than All Others

If you get three bids and one is 30-40% lower than the other two, that is not good news — it is a warning sign.

There are only a few explanations for a dramatically low bid:

They misunderstood the scope (and will bill you change orders to make up the difference)
They are cutting corners on materials or labor quality
They have intentionally underbid to win the job, planning to renegotiate mid-project
They are misclassifying their workers to avoid workers' comp costs (a liability for you)

The lowest bid routinely ends up costing the most.

9. Suggesting You Skip the Permit

Any contractor who suggests skipping permits to save time or money is asking you to take their legal risk onto yourself. As the property owner, you are responsible for unpermitted work on your property — not the contractor who did it.

Unpermitted work can prevent you from selling the home, void your insurance, or require demolition and re-construction to bring into compliance. It is never worth it.

10. Wants to Be Paid Entirely in Cash

There is no legitimate reason for a construction project to be conducted entirely in cash. Cash payments:

Leave no paper trail if there is a dispute
May indicate the contractor is hiding income (tax fraud)
Are impossible to reverse if the contractor disappears
Make it harder to prove payment if a mechanics lien is filed

Pay by check or credit card. Keep every receipt.

11. Asks You to Pull the Permit Yourself

Contractors pull permits. If a contractor asks you to pull the permit as the "owner-builder," they are either trying to avoid the liability that comes with pulling a permit (meaning their work would be inspected under their license) or they are not able to pull permits because of licensing issues.

The only legitimate reason for owner-builder permits is if you, the homeowner, are doing the work yourself or directly hiring individual tradespeople.

12. Bad Communication During the Estimate Process

How a contractor communicates before you hire them is exactly how they will communicate during construction — except usually worse, once they have your money.

If they:

Take days to respond to calls or emails
Are vague or evasive when you ask specific questions
Show up late to the estimate appointment without explanation
Submit a disorganized or hard-to-understand estimate

...these habits do not improve once construction starts.

13. No Written Contract Offered

Any professional contractor working on a project over a few thousand dollars will have a standard contract template. If a contractor starts work without offering a written contract — or actively resists putting things in writing — that is a serious problem.

A written contract is not about distrust. It is about clarity. Every professional contractor understands this. The ones who resist written contracts are either inexperienced or planning to operate in a way that does not hold up to documentation.

14. Subcontracting Without Disclosure

Most general contractors use subcontractors for specialty work (electrical, plumbing, HVAC, tiling). That is normal. What is not acceptable is if a GC contracts for all work and then subcontracts everything without telling you — especially if the subcontractors are unlicensed or uninsured.

Ask: "Which parts of this project will you subcontract out, and can I verify that those subs are licensed and insured?"

A legitimate GC will answer this clearly. Evasiveness is a signal.

15. No Lien Release Process

When you pay a contractor, you are not just paying them — you are (implicitly) paying all the subcontractors and suppliers they owe. If your contractor fails to pay their subs or suppliers, those parties can file a mechanics lien against your property — even if you paid the contractor in full.

A professional contractor will provide conditional lien releases with each progress payment and an unconditional lien release at project completion. If a contractor has never heard of lien releases, that is a red flag about their business practices.

What to Do If You Spot Red Flags

Once you have found a legitimate contractor, the next step is getting a bid you can actually evaluate. See our guide on how to read a contractor estimate and our negotiation guide before you sign anything.

One red flag is worth noting. Two or more red flags mean you should not hire that contractor regardless of how much you like them personally or how competitive their price is. The financial exposure from a bad hire is far greater than the inconvenience of finding someone else.

If you want a structured evaluation framework, our Contractor Hiring Kit includes a red flags scorecard, bid comparison matrix, and 24 interview questions — everything you need to vet a contractor properly before you sign anything.