Vendor Vetting Checklist: 10 Things to Verify#

Every year, Americans lose over $10 billion to home improvement fraud, shoddy workmanship, and contractor disputes. The vast majority of these losses are preventable. They happen because homeowners skip basic verification steps that would have identified unqualified, uninsured, or dishonest providers before any money changed hands.

The 10-point checklist in this guide is not theoretical. It is the distillation of what consumer protection agencies, contractor licensing boards, insurance companies, and attorneys consistently recommend. Each item takes 5 to 15 minutes to verify. The entire checklist can be completed in 60 to 90 minutes. That investment protects financial commitments that routinely reach thousands or tens of thousands of dollars.

Some of these items will feel obvious. Good. Obvious steps that everyone knows about and nobody does are the exact steps responsible for the majority of preventable losses. This checklist is not about discovering obscure secrets. It is about systematically executing the basics that most homeowners skip out of convenience, social discomfort, or misplaced trust.

Item 1: Valid State or Local License#

What to verify: The provider holds a current, active license for the specific trade and scope of work they will perform.

How to verify: Visit your state's contractor licensing board website. Every state maintains a searchable database of licensed contractors. Enter the provider's name, business name, or license number and confirm the license is active, the correct trade category covers your project, and no disciplinary actions are pending or on record.

Why it matters: Licensing ensures the provider has met minimum competency requirements, which typically include passing trade-specific exams, demonstrating work experience (usually 2 to 5 years as a journeyman), and maintaining continuing education. Without a license, you have no assurance that the person working on your electrical system, plumbing, or structural elements has any formal training.

Licensing also provides legal recourse. If a licensed contractor performs defective work, you can file a complaint with the licensing board, which can sanction the contractor, order remediation, or revoke their license. With an unlicensed contractor, your only recourse is civil litigation, which is expensive and time-consuming.

Common pitfall: Accepting a general contractor's license as sufficient for specialized trades. A general contractor is licensed to manage projects, not to perform electrical, plumbing, or HVAC work. If the project involves regulated trades, either the GC must hold additional licenses or must subcontract to licensed specialists. Verify the specific trade licenses, not just the general contractor license.

Red flag: The provider claims they do not need a license, that licensing is just government bureaucracy, or that they are in the process of getting licensed. Walk away.

Item 2: Current Insurance Coverage#

What to verify: The provider carries both general liability insurance and workers' compensation insurance, both with current effective dates.

How to verify: Ask the provider for a Certificate of Insurance (COI). This is a standard document that insurance companies issue to policyholders for exactly this purpose. It lists the policy types, coverage amounts, effective dates, and the insurance company name.

Call the insurance company listed on the certificate and confirm the policy is active. Some fraudulent operators present expired or fabricated certificates. A two-minute phone call to the insurer eliminates this risk.

Why it matters: General liability insurance covers damage to your property caused by the provider's work. If a painter spills a can of paint on your hardwood floor or a roofer's equipment damages your siding, their liability insurance pays for the repair. Without it, you bear the cost.

Workers' compensation insurance covers injuries to the provider's employees while on your property. This is critical. If an uninsured worker falls off a ladder at your house and breaks their back, their medical bills and lost wages could become your responsibility. Homeowner's insurance policies vary in how they handle injuries to uninsured workers on your property, but the worst-case scenario involves personal liability for hundreds of thousands of dollars in medical costs.

Minimum coverage amounts: General liability should be at least $1 million per occurrence and $2 million aggregate. Workers' compensation should meet your state's minimum requirements (varies by state).

Red flag: The provider says they are insured but cannot produce a certificate, or produces one with an expired date, or asks you to trust them because getting a certificate is too much trouble.

Item 3: Physical Business Address#

What to verify: The provider operates from a verifiable physical address, not just a PO Box or cell phone number.

How to verify: Check the business address on their website, business card, or quote documents. Search the address online to confirm it exists and is a commercial or home office location. Drive by if it is local. Check that the address matches their business registration with the state.

Why it matters: A physical address establishes permanence and accountability. A provider with a shop, office, or registered home business has invested in a fixed location and is less likely to disappear mid-project. A provider operating from a truck with only a cell phone number has minimal overhead, which also means minimal accountability.

This does not mean that all home-based businesses are unreliable. Many excellent tradespeople operate from home offices with workshop spaces. The key is that the address exists, matches their business registration, and provides a location where they can be found if issues arise.

Red flag: No physical address listed anywhere. Only a cell phone number. Business address is a UPS Store or similar mailbox service.

Item 4: Written References from Similar Projects#

What to verify: The provider can supply names and contact information for 3 to 5 clients who had similar work performed within the last 2 years.

How to verify: Call or email the references. Ask them specific questions about the scope of work, timeline adherence, cost accuracy (final cost versus original quote), communication quality, how issues were handled, and whether they would hire the provider again.

Why it matters: Past performance is the best predictor of future performance. A provider who consistently delivers quality work on time and on budget for other clients will likely do the same for you. A provider who cannot produce references either has no satisfied clients or has not been in business long enough to establish a track record.

Questions to ask references:

• What work was done and when?
• Was the final cost within 10 percent of the original quote?
• Was the project completed by the agreed-upon date?
• Were there any problems? If so, how were they resolved?
• Was the provider easy to communicate with?
• Would you hire them again without hesitation?

The last question is the most informative. A reference who pauses, hedges, or says "probably" is telling you something different from one who says "absolutely, already have them scheduled for another project."

Red flag: Provider cannot supply references, references are all family members or personal friends, references are from projects more than 3 years ago, or references are for significantly different types of work.

Item 5: Online Reputation Assessment#

What to verify: The provider's online reviews across multiple platforms present a consistent picture of quality and professionalism.

How to verify: Check Google Business Profile reviews, Yelp, the Better Business Bureau, Angi, and any industry-specific platforms. Look at the total review count, the average rating, the content of both positive and negative reviews, and the provider's responses to negative reviews.

Why it matters: While no single review is reliable, the aggregate pattern across 20 or more reviews provides a reasonably accurate picture. A provider with 100 reviews and a 4.6-star average has demonstrated consistent quality over a significant sample size. A provider with 5 reviews and a 5.0-star average has an insufficient sample.

Pay particular attention to negative reviews and how the provider responds. Every business gets occasional negative reviews. The question is whether the criticism reveals a pattern (consistently late, poor communication, hidden charges) and whether the provider responds professionally (acknowledging the issue, offering resolution) or defensively (blaming the customer, denying obvious problems).

Pattern to watch for: Multiple reviews mentioning the same issue (unexpected charges, poor cleanup, missed deadlines) indicate a systemic problem, not isolated incidents.

Red flag: No online presence at all, fewer than 5 reviews total, or responses to negative reviews that are combative or dismissive.

Item 6: Better Business Bureau Status#

What to verify: The provider's BBB profile, including any complaints filed and their resolution status.

How to verify: Search bbb.org for the business name. Review their rating (A+ through F), the number of complaints filed in the last 3 years, and how complaints were resolved.

Why it matters: The BBB complaint process provides a structured mechanism for resolving disputes. Providers who respond to and resolve BBB complaints demonstrate a commitment to customer satisfaction. Providers who ignore BBB complaints reveal a pattern of unaccountability.

A few complaints over many years of business are normal. No business operates at scale without occasional dissatisfied customers. The key metrics are the complaint-to-customer ratio and the resolution rate. A company with 5 complaints and 5 resolutions over 10 years is healthy. A company with 15 unresolved complaints in 2 years has a systemic problem.

Red flag: Numerous unresolved complaints, particularly those involving the same issues (failure to complete work, refusal to honor warranties, unexpected charges).

Item 7: Written Detailed Quote#

What to verify: The provider has given you a written quote that specifies the scope of work, materials to be used (brands and grades), labor costs, project timeline, payment terms, and warranty.

How to verify: Review the quote document for completeness. If any of the above elements are missing, request them in writing before proceeding.

Why it matters: A verbal quote is worthless in a dispute. A vague written quote ("bathroom renovation - $15,000") is barely better. A detailed quote that specifies every element of the project creates mutual accountability and prevents the most common source of contractor disputes: mismatched expectations.

The quote should be specific enough that a third party could read it and understand exactly what will be done, with what materials, by when, and for how much. If the provider is unwilling or unable to produce this level of detail, they either have not thought through the project carefully enough or are deliberately leaving ambiguity that benefits them.

What a complete quote includes: Line-item materials list with brands and quantities, labor hours or cost, project start and completion dates, payment schedule tied to milestones, warranty terms for both labor and materials, what is explicitly excluded from the scope, the process for handling change orders.

Red flag: Provider insists on verbal agreements, provides a one-line quote with no detail, or resists putting specific terms in writing.

Item 8: Clear Contract Terms#

What to verify: A written contract exists that includes all quote terms plus additional protections for both parties.

How to verify: Read the contract completely before signing. If anything is unclear, ask for clarification in writing. If the contract includes terms you do not understand, consult a local attorney (many offer 30-minute consultations for $50 to $100).

Why it matters: The contract is the legal document that governs the entire relationship. It protects you if the provider fails to deliver and protects the provider if you fail to pay. Without a contract, disputes devolve into he-said-she-said arguments that are expensive to resolve.

Essential contract elements: Full scope of work, materials specifications, total cost and payment schedule, start and completion dates, change order process (must be in writing with agreed pricing), warranty terms, dispute resolution mechanism, cancellation terms, cleanup and debris removal responsibility, permit responsibility (who pulls permits and pays for inspections), and compliance with local building codes.

Payment schedule best practices: Never pay more than one-third upfront. Structure payments as milestones: one-third at signing (or upon material delivery), one-third at project midpoint, and one-third upon completion and your inspection. Never pay the final installment before inspecting the work and confirming it meets the agreed-upon specifications.

Red flag: No written contract offered, contract is excessively short or vague, contract requires more than 50 percent upfront, contract does not include a warranty, or provider pressures you to sign immediately without time to review.

Item 9: Permit Compliance#

What to verify: For projects that require building permits, the provider will pull all necessary permits and schedule all required inspections.

How to verify: Ask the provider directly: "Does this project require permits?" Then verify their answer by calling your local building department. Building departments are public-serving offices that will tell you over the phone whether a specific type of work requires a permit in your jurisdiction.

Why it matters: Building permits exist to ensure that construction and renovation work meets safety codes. Plumbing, electrical, structural, and HVAC work almost always require permits. The permitting process includes inspections at key stages by municipal inspectors who verify code compliance.

Unpermitted work creates three serious risks. First, safety: work that is not inspected may not meet fire, structural, or safety codes, creating hazards for your family. Second, insurance: if your home suffers damage related to unpermitted work (a fire caused by improper electrical work, for example), your insurance company may deny the claim. Third, resale: when you sell your home, the buyer's inspection or appraisal may identify unpermitted work, requiring expensive remediation or reducing your sale price.

A provider who suggests skipping permits is not saving you money. They are transferring risk from themselves to you.

Red flag: Provider says permits are unnecessary for work that clearly requires them, offers to do the work without permits to save time and money, or suggests that the building department will never find out.

Item 10: Gut Check and Communication Quality#

What to verify: Your overall impression of the provider's professionalism, communication, and trustworthiness.

How to verify: This is the subjective assessment that integrates everything you have observed throughout the vetting process. It cannot be reduced to a database search or document review, but it is no less important.

What to assess: Did the provider show up on time for the estimate? Did they return calls and emails within 24 hours? Did they listen to your concerns or talk over you? Did they explain the project in terms you could understand without being condescending? Did they pressure you to decide immediately or give you time to compare options? Did they speak respectfully about competitors or trash-talk them? Did they walk through your home respectfully or track mud on your floors?

Why it matters: The vetting process is a preview of the working relationship. A provider who is difficult to reach before getting the job will be impossible to reach after getting it. A provider who is dismissive during the estimate will be dismissive when you raise concerns during the project. A provider who pressures you to decide quickly is more interested in closing a sale than in earning your business.

Trust your discomfort. If something about the interaction feels wrong, even if you cannot articulate exactly what, that feeling is information. You are about to let this person into your home, potentially for days or weeks, and trust them with a significant financial commitment. If the relationship does not feel right at the beginning, it will not improve under the stress of a live project.

Red flag: High-pressure sales tactics, unwillingness to provide any of the items on this checklist, negative comments about every competitor, claims that sound too good to be true, or a general sense that the provider is more interested in getting your money than in doing excellent work.

Using the Checklist#

Print this checklist or save it on your phone. Before hiring any service provider for any project over $500, work through all 10 items. Score each item as pass, fail, or needs investigation. Any item that scores "fail" is a reason to eliminate the candidate. Two or more items that score "needs investigation" warrant additional scrutiny before proceeding.

The 60 to 90 minutes you invest in this process protects a financial commitment that may be 10, 50, or 100 times larger. No other hour of your time delivers a comparable return on investment. The homeowners who consistently avoid contractor problems and get quality work at fair prices are not lucky. They are systematic. This checklist is their system.