The Complete Guide to Hiring a Contractor: How to Protect Your Home and Your Money

Why Hiring the Wrong Contractor Is One of the Most Expensive Mistakes a Homeowner Can Make

Every year, American homeowners lose an estimated $17 billion to contractor fraud, shoddy workmanship, and abandoned projects. That number comes from the FBI’s financial crimes unit and state attorney general offices that track contractor complaints — and it almost certainly understates the real damage, because most homeowners never file a formal complaint. They just absorb the loss and move on.

Here’s what makes contractor problems so financially devastating: the damage often isn’t visible right away. A contractor who skips the proper waterproofing step on a bathroom tile job may have done work that looks flawless for six months. Then the water starts getting into your subfloor. By the time you smell it, you’re looking at a mold remediation job, a full subfloor replacement, and possible structural repairs.

All of that remediation comes on top of tearing out the original tile work. What started as a $4,000 bathroom remodel turns into a $15,000 nightmare — and that estimate assumes no structural damage to the joists below.

And that’s before we talk about liability. If an unlicensed worker gets hurt on your property, your homeowner’s insurance may not cover it. You could be personally liable for medical bills, lost wages, and legal fees. The contractor who quoted you the lowest price may be the one who ends up costing you the most.

What kinds of projects carry the highest risk?

Structural work, roofing, electrical, plumbing, and HVAC carry the most risk — both because of the safety consequences of bad work and because defects are often hidden inside walls, attics, or crawlspaces. Cosmetic work like painting or landscaping is generally lower stakes. But any project that touches your home’s bones, skin, or systems deserves serious vetting.

A contractor who skips required permits is also putting you at risk as the homeowner. Unpermitted work can void your homeowner’s insurance coverage, create problems when you try to sell your house, and require you to tear out finished work for a code inspection. The permit is not red tape — it is your proof that the work was done to code.

Why do so many homeowners skip proper vetting?

Most homeowners who get burned didn’t think they were being reckless. They trusted a referral from a neighbor. They liked the contractor’s personality. They were excited about the project and didn’t want to slow it down.

Those are all understandable human responses — but they’re not substitutes for verification. Liking someone is not the same as vetting them.

The contractors who cause the most damage are often the most likable ones. They’re confident, they talk a great game, and they’ll tell you exactly what you want to hear. What they won’t volunteer is that their license expired two years ago, they don’t carry workers’ comp, and they have a trail of incomplete jobs behind them. Your job — before you sign anything — is to find that out.

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The 5 Things to Verify BEFORE Hiring Any Contractor

These aren’t suggestions. These are the five verification steps that separate homeowners who get great work from homeowners who get burned. Do all five, every time, regardless of how good the referral was or how much you like the person. Verification is not an insult — it is standard professional practice, and any contractor worth hiring will understand that.

How do you verify a contractor’s license?

Every state in the U.S. (plus Washington, D.C.) maintains a public database of licensed contractors. You can search these databases for free — look up your state’s contractor licensing board and search by business name or license number. Confirm that the license is active, covers the type of work you need done, and is registered to the actual person or company you’re hiring.

Don’t just ask for the license number and take their word for it — look it up yourself. A license number is easy to fabricate. What matters is whether that number actually comes back to an active, properly classified license in your state’s system. For a deeper walkthrough of this process, see our guide on how to check if a contractor is licensed and insured.

If a contractor tells you they don’t need a license for your type of project, verify that independently. Licensing requirements vary by state and trade, but when in doubt, call your local building department and ask. It takes five minutes and could save you thousands.

What insurance does a contractor actually need?

A legitimate contractor carries two types of insurance: general liability and workers’ compensation. General liability protects your property if the contractor accidentally causes damage — a worker breaks a window, or a tool falls and damages your deck. Workers’ compensation protects you if a worker gets injured on your property.

Ask for a Certificate of Insurance (COI) — not just verbal confirmation. The COI should list your name and address as the certificate holder, and the coverage limits should be appropriate for the size of your project. A $150,000 renovation project needs higher coverage limits than a $3,000 fence installation. If the contractor hesitates or says their “insurance card is in the truck,” walk away.

Call the insurance company listed on the COI directly to confirm the policy is still active. Insurance certificates can be faked, and coverage can lapse after the certificate is printed. A two-minute phone call is all it takes to confirm you’re actually covered.

Why does permit history matter so much?

A contractor’s permit history tells you something that reviews and references can’t: whether they actually do work by the book. Pulling permits is legally required for most significant home improvements. A contractor who consistently skips permits is cutting corners on your project — and creating potential legal and financial problems for you as the homeowner.

Most local building departments make permit records publicly available. You can search by contractor name or license number to see what permits they’ve pulled, what projects they’ve completed, and whether any inspections failed. Consistent inspection failures are a serious warning sign. For a full guide to reading permit records, see our article on how to check a contractor’s permit history and why it matters.

How do you separate genuine reviews from fake ones?

Online reviews are useful, but they require some critical thinking. Look for patterns across multiple platforms — Google, Yelp, Houzz, Angi, and the BBB — rather than relying on any single source. A contractor with 50 four-star reviews spread across years is far more credible than one with 20 five-star reviews all posted within the same two-week window.

Pay as much attention to the negative reviews as the positive ones. Not every negative review is legitimate — disgruntled customers exist in every trade. But look for patterns: do multiple reviewers mention the same problem? Patterns of behavior across multiple reviews are far more telling than any single comment.

Watch specifically for recurring mentions of contractors not showing up, not finishing, or refusing to return calls after the check cleared. Those are the patterns that matter most.

For a full breakdown of what to look for — and what to ignore — see our guide on what contractor reviews really tell you and what they don’t.

What does a BBB report actually tell you?

The Better Business Bureau maintains complaint records, business profiles, and accreditation status for millions of contractors. A BBB report can tell you how long the company has been in business, what complaints have been filed, and whether those complaints were resolved. A pattern of unresolved complaints is a significant red flag — even if the overall rating looks acceptable.

BBB accreditation is voluntary and costs money, so not every legitimate contractor will be accredited. But complaints are complaints — whether or not the company paid for accreditation. Search the BBB database by business name and location, and look at the complaint history, not just the letter grade. Our detailed guide walks you through how to read a contractor BBB report before you hire.

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How to Get Quotes the Right Way

Getting multiple bids is one of the most commonly given pieces of advice in home improvement — and one of the most commonly done wrong. Three bids is the standard minimum, but only if those three bids are covering the same scope of work. A quote comparison that isn’t apples-to-apples tells you almost nothing useful.

Why does scope of work matter so much when comparing bids?

Here’s a common scenario: you get three quotes for a roof replacement. One comes in at $8,500, one at $12,000, and one at $15,000. The low bid looks attractive — until you realize it doesn’t include removing the old underlayment, uses a lower-grade shingle, and excludes replacing any rotted decking they find.

The “expensive” bid covers all of that and includes a longer workmanship warranty. The quotes weren’t comparable at all — and the low bid wasn’t actually cheaper once you account for what it left out.

To compare bids fairly, give every contractor the same written scope of work before they quote. Specify the materials you want (brand, grade, model number if applicable), the exact work to be done, what’s included and what’s excluded, and any existing conditions they need to account for. When everyone is quoting the same job, the price differences become meaningful — and the outlier bids, high or low, become obvious.

Should you automatically choose the lowest bid?

No — and experienced homeowners know this instinctively. A bid that’s dramatically lower than the others is a warning sign, not a windfall. The low bidder may be skipping essential steps, planning to substitute cheaper materials, or underbidding intentionally to get the job and then hit you with change orders once work begins.

The reverse is also true: the highest bid isn’t automatically the best. Look for the bid that shows the most detailed understanding of your project. The contractor who asks the most questions, requests the most access for their assessment, and delivers the most detailed written quote is usually the one who knows exactly what they’re getting into — and won’t hit you with surprises later.

How do you find contractors worth getting a bid from?

Start with referrals from people whose taste and judgment you trust — not just “my neighbor used them.” Ask specifically: Did they finish on time? Did the final cost match the estimate? Would you hire them again without hesitation?

A lukewarm “they were fine” is not a strong referral. You want someone who says “I’d call them tomorrow” — and means it.

Trade associations are another solid source. The National Association of the Remodeling Industry (NARI), the National Roofing Contractors Association (NRCA), and trade-specific state associations maintain member directories. Members typically agree to a code of ethics and carry required licensing and insurance as a condition of membership. This doesn’t guarantee great work, but it filters out a significant portion of the worst actors.

Beyond referrals and associations, always do your own verification regardless of the source. A contractor recommended by your best friend still needs to show current license, valid insurance, and a clean permit record before they touch your home.

What questions should you ask during the bidding process?

When meeting with contractors for estimates, ask these questions directly and watch the responses carefully. How long have you been in business under this company name? Will you personally be on the job, or will it be subcontractors?

Also ask: If subcontractors, are they licensed and insured too? How many active projects do you have right now? A contractor juggling a dozen jobs rarely gives any of them the attention they need.

Also ask: Who do I call if there’s a problem and you’re not on-site? What does your warranty cover and for how long? Can you provide three references from similar projects in the past 12 months? A contractor who gets irritated by these questions, deflects them, or can’t answer them clearly is telling you something important.

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Red Flags That Should Stop You From Signing Anything

Most homeowners who get burned report, in hindsight, that the warning signs were there — they just didn’t know what to look for, or they talked themselves out of taking them seriously. These are not edge cases or rare scenarios. These are patterns that repeat constantly across contractor complaint files in every state in the country.

What are the biggest warning signs before a job starts?

They approach you unsolicited — especially after a storm or major weather event. Door-to-door contractors who show up uninvited with a “special deal” are one of the most common sources of contractor fraud. Legitimate contractors get work through referrals and reputation, not by knocking on doors after hailstorms.

They want a large upfront cash payment. A reasonable down payment is typically 10-30% of the total project cost, paid by check or credit card. Any contractor demanding 50% or more upfront, or asking for cash only, is a red flag. Cash payments are untraceable, and large upfront demands are a classic setup for a contractor who plans to disappear.

They pressure you to sign today. Phrases like “I can only hold this price until tonight” or “I have another customer who wants this slot” are pressure tactics, not legitimate business constraints. A reputable contractor won’t evaporate if you take three days to review the contract and verify their credentials.

They can’t or won’t provide license and insurance documentation. This is not negotiable. If they “forgot” the paperwork, ask them to email it before you schedule any work. If they’re resistant or have repeated excuses, trust what that tells you.

What red flags show up in the contract itself?

Any contract that is vague about materials is a problem. If it says “standard roofing shingles” instead of specifying the manufacturer, product line, and warranty class, you have no guarantee of what will actually be installed. Vague language in contracts always benefits the contractor, never the homeowner.

A contract without a payment schedule tied to project milestones is also dangerous. You should be paying for completed work, not for work that hasn’t happened yet. If the contract shows a lump sum due at signing with no milestone breakpoints, that’s a structure that benefits a contractor who plans to take your money and slow-walk the job.

No written change order process is another red flag. Every legitimate change to the scope of work — including things the contractor “discovers” after demo — should be documented in writing and priced before the work proceeds. A contractor who says “we’ll work it out” when changes come up is setting up a disagreement that will cost you money.

What are the warning signs during an active job?

A contractor who is consistently absent from the job site while billing for labor hours is a problem. You should be able to reach your contractor by phone during business hours. If calls go unreturned for more than 24 hours, especially during active work phases, escalate immediately — don’t wait and hope it resolves itself.

Materials showing up at your job site that don’t match what was specified in the contract is another serious sign. Contractors who substitute cheaper materials without disclosing it to you are effectively stealing the difference. If you notice a discrepancy, stop work, document it with photos, and get a written explanation before work continues.

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What Should Be in Every Contractor Contract

A contractor contract is not a formality. It is a legally binding document that defines exactly what you’re paying for, when you’re paying for it, and what happens if something goes wrong. A weak contract is almost worse than no contract at all — it creates false security while leaving you without real protection.

If a contractor shows up with a two-paragraph “agreement” on a preprinted pad, that is not a contractor contract. That is a receipt with a signature line. Do not sign it as your sole documentation for a significant project.

What are the non-negotiable elements of a real contractor contract?

Full identification of both parties — complete legal name, business address, license number, and contact information for both you and the contractor. If they’re operating as an LLC or corporation, the contract should reflect the business entity, not just a personal name.

Detailed scope of work — a description specific enough that a third party could read the contract and know exactly what was agreed to. Not “install new floors” but “install 450 square feet of 5/8-inch white oak engineered hardwood (Brand X, Product Y, color Z) in the main living area and hallway, including removal and disposal of existing carpet and pad.”

Materials specifications — brand, model, grade, and quantity for every significant material in the project. This protects you from substitution and creates a baseline for quality disputes if the work doesn’t meet expectations.

Payment schedule tied to milestones — not just a total price, but a breakdown of when payments are due and what must be completed before each payment is made. A reasonable structure might be: 10% at signing, 30% when materials are delivered and work begins, 40% at substantial completion, 20% at final walkthrough and punch list sign-off.

What legal protections should every contract include?

Start and completion dates — with language about what happens if the contractor misses the timeline. “Substantial completion by [date]” is standard language. You may not get exact-date guarantees for complex projects, but there should be a target completion date and a process for communicating delays.

Lien waiver provisions — this is critical. Mechanics’ liens allow unpaid subcontractors and material suppliers to place a claim against your property even if you paid the general contractor in full. A proper contract should include a provision requiring the contractor to provide lien waivers from themselves and any subcontractors as a condition of final payment.

Change order process — written confirmation that any changes to the original scope, timeline, or price must be documented in writing and signed by both parties before additional work proceeds. This one clause prevents the majority of contractor payment disputes.

Dispute resolution — a clause specifying how disagreements will be handled. Options include mediation, arbitration, or small claims court (depending on the dollar amount). Having an agreed process in advance is far better than trying to negotiate one after a dispute erupts.

What should you do before signing?

Read the entire contract before you sign it — even if it takes an hour. Ask questions about anything you don’t understand. If the contractor pressures you to sign immediately without reading, consider that a disqualifying red flag. You have every right to take the contract home, review it overnight, and return signed the next day.

If the project is large (anything over $25,000), it’s worth having a real estate or construction attorney review the contract before you sign. The cost of a one-hour legal review is almost always less than the cost of the dispute it might prevent. And keep a copy of the signed contract somewhere you can find it — not just in an email thread you’ll have to dig through later.

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How to Manage the Project Once Work Begins

Signing the contract is the beginning, not the end, of your job as a homeowner. Active, engaged oversight of a home improvement project is not micromanagement — it’s how you protect an investment that may represent tens of thousands of dollars. The contractors who do their best work are not bothered by an attentive homeowner. The ones who are bothered by it are usually the ones who were counting on you not paying attention.

How should you document the work as it progresses?

Take dated photos throughout the project — before work starts, after each major phase, and at final completion. Photos are the single most powerful evidence you’ll have if a dispute arises. The cost of pulling out your phone twice a day is zero; the value of that documentation in a dispute can be enormous.

Keep a simple project log: note who was on the job each day, what work was performed, what materials were delivered, and any conversations or decisions that happened. It doesn’t need to be elaborate — a notes app on your phone works fine. Date every entry. This becomes your timeline if you ever need to reconstruct what happened and when.

For every payment you make, get a receipt — ideally a written receipt from the contractor confirming the amount paid and the milestone it covers. Pay by check or credit card, not cash, so there’s a paper trail. Never make a payment without something in writing that confirms what it was for.

How do you handle changes that come up mid-project?

Changes happen on almost every significant home improvement project — especially remodels that open up walls and floors. Hidden rot, out-of-code wiring, unexpected plumbing configurations — these are real issues that require real decisions. The key is that no change should proceed without a written change order signed by both parties.

A legitimate change order should specify exactly what additional work is needed and why, what materials it requires, how much it will cost (labor and materials broken out), and how it affects the project timeline. Review each change order carefully. Some contractors use change orders as a revenue center — bidding low, then recovering margin through a series of “unexpected” add-ons. If you see a pattern of this, it’s worth a frank conversation about your expectations.

What does a professional final walkthrough look like?

Before making your final payment, do a thorough walkthrough of all completed work with the contractor present. Bring a printed copy of the contract and the original scope of work. Check every item on the agreed scope — not just the obvious things, but the details like trim installation, caulking, paint coverage at corners, and hardware installation.

Create a punch list of anything that needs to be corrected or completed. Get written agreement from the contractor on what will be fixed and by when, before you release the final payment. The final payment is your leverage — once it’s gone, your ability to compel corrections drops dramatically. Don’t release it until you’re satisfied the work is complete.

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What to Do If Something Goes Wrong

Even with good vetting and a solid contract, projects can go sideways. The contractor may miss deadlines, deliver substandard work, or in the worst cases, take your money and disappear. Knowing what your options are before a problem happens puts you in a much stronger position when one does.

What should your first steps be if a problem develops?

Start with direct communication — a written message (email or text so there’s a record) clearly stating the specific problem and what resolution you’re requesting. Give the contractor a reasonable response deadline, typically 48-72 hours. Keep the tone professional. You’re documenting a business problem, not venting frustration.

If the contractor is unresponsive or the problem is serious, get an independent assessment from another licensed contractor. This gives you a professional opinion on the nature and cost of the defect — documentation that becomes critical if you end up in a formal dispute. Get it in writing. The second contractor’s assessment can often move an unresponsive first contractor to action faster than any direct demand from you.

What formal options do homeowners have?

State contractor licensing board: Every state that licenses contractors has a board that investigates complaints. Filing a complaint won’t get you money back directly, but it creates an official record, can result in license suspension, and sometimes prompts settlements because contractors don’t want disciplinary action on their license. This is often your most powerful lever for disputes under $10,000.

Small claims court: For disputes under your state’s small claims limit (typically $5,000-$15,000 depending on the state), this is a viable option that doesn’t require an attorney. The filing fee is usually $50-$100, the process is designed for non-lawyers, and judgments are issued quickly. Your documentation — photos, receipts, written communications, the signed contract — is what wins or loses small claims cases.

Civil court with an attorney: For larger disputes, especially those involving significant property damage or fraud, an attorney is the right path. Many construction attorneys work on contingency for clear-cut contractor fraud cases. Your state bar association can provide a referral.

Your homeowner’s insurance: Depending on the nature of the damage, your homeowner’s policy may cover some or all of it. Call your insurer and describe the situation — don’t assume it’s not covered before you ask. Keep in mind that claims may affect your premium, so weigh that factor for smaller damage amounts.

What if the contractor placed a lien on your property?

A mechanics’ lien on your property is serious but not catastrophic. It must be addressed before you can sell or refinance your home. If a contractor filed a lien after you paid them in full (which happens when they didn’t pay their subcontractors or suppliers), you have legal remedies including filing a “lien release bond” and pursuing the contractor for the subcontractors’ claims.

If you receive a lien notice — which in most states must be sent to you before a lien can be filed — do not ignore it. Consult a real estate attorney immediately. Liens have filing deadlines and expiration dates, and acting quickly preserves your options. This is another reason lien waiver provisions in the original contract are so important.

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The Complete Contractor Hiring Checklist

Print this out. Use it every time. The homeowners who get burned are almost always the ones who trusted their gut instead of working a checklist. The steps below represent every verification and protection action covered in this guide, compressed into a format you can work through before you sign anything.

What should you verify before the first meeting?

Before you even invite a contractor to your home for an estimate, do preliminary screening. This takes 15-20 minutes and eliminates the worst candidates before they ever walk through your door.

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Frequently Asked Questions

How much should a contractor ask for as a down payment?

A reasonable down payment is typically 10% to 30% of the total project cost. Some states actually cap the legal down payment amount — in California, for example, contractors cannot legally collect more than 10% or $1,000, whichever is less, as a deposit for most residential projects. Any contractor demanding 50% or more upfront, or asking for full payment before work begins, should be declined. That structure benefits only a contractor who intends to abandon your project.

Is a licensed contractor always better than an unlicensed one?

In almost every case, yes — and for more than just quality reasons. Where licensing is required, hiring an unlicensed contractor exposes you to serious legal and financial risk. If an unlicensed worker is injured on your property, your homeowner’s insurance may not cover the claim. And in a dispute, an unlicensed contractor has far less accountability — no licensing board to complain to, no bond to make a claim against.

What happens if a contractor does unpermitted work on my house?

Unpermitted work can create problems that outlast the original project by years. It can void your homeowner’s insurance coverage for damage related to that work. When you sell the home, a buyer’s inspection may flag the unpermitted work, triggering required disclosure or mandatory remediation before closing. The contractor who says “permits aren’t necessary” is putting you — not themselves — at long-term risk.

How do I know if a contractor’s insurance certificate is real?

The surest method is to call the insurance company listed on the certificate directly — not the number on the certificate (which could be manipulated), but the number you find independently on the insurer’s official website. Ask the insurer to confirm that the policy is active, that the named insured matches the contractor’s business name, and that the coverage limits are as shown on the certificate. This takes five minutes and gives you direct, independent confirmation. Do not skip this step for any project over a few thousand dollars.

What is the single most important thing a homeowner can do before hiring a contractor?

Verify the license independently — meaning you search the state licensing database yourself rather than taking the contractor’s word for it. A license number is meaningless if you don’t confirm it’s active, current, and properly classified for the work you need. This single step eliminates a huge percentage of the fraudulent and unqualified contractors who cause the most financial harm to homeowners every year. Do it yourself, in the official state database, before you schedule an estimate or sign anything.

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