Contractor Red Flags Checklist: 20 Warning Signs Before You Hire

Contractor fraud and substandard work cost American homeowners an estimated $17 billion annually according to the National Association of Homebuilders. Most victims describe warning signs they noticed but dismissed before the problem became serious. This checklist covers the red flags that matter most — before you sign a contract and during the project.

What are the most important pre-hire red flags?

Before signing anything, the most serious red flags are: inability or refusal to provide a license number, no verifiable physical business address, a request for large deposits (over 30% upfront), refusal to provide a written contract, pressure to sign immediately, and a price significantly below every other bid you received. Any single one of these warrants significant additional scrutiny. Two or more are grounds to walk away.

• Cannot provide a license number — or provides a number that does not verify
• No physical address — only a P.O. box, cell phone, and email
• Large upfront deposit — anything over 30% of total contract value before work starts
• Refuses to provide a written contract — wants to work on a handshake
• High-pressure tactics — “This price is only good today”
• Price 30%+ below all other bids — either scope is mismatched or corners will be cut
• Cash-only demand — no paper trail, no consumer protections
• Cannot provide proof of insurance — or insurance certificate is clearly dated or from an unknown insurer

What contract red flags should I watch for?

In the contract itself, red flags include vague scope language (“as needed” or “standard quality” without specifics), payment schedules that are time-based rather than milestone-based, mandatory binding arbitration clauses, clauses waiving your right to cancel, no warranty provision, and the contractor's license number absent from the document (required by law in most states).

• Vague scope — no specific materials, brands, or specifications
• Time-based payment schedule rather than milestone-based
• No warranty clause or extremely limited warranty
• Mandatory binding arbitration waiving court rights
• No contractor license number on the document (legally required in most states)
• No mention of permit responsibility

What during-project red flags indicate trouble ahead?

Once work has started, watch for: work that stops for days without explanation, crew being replaced frequently without notice, requests for additional payment before agreed milestones are reached, materials arriving that look different from what was specified, failure to pull permits for work that requires them, and evasive answers to direct questions about timeline or scope changes.

• Work stops for unexplained extended periods
• Requests for additional money ahead of agreed milestones
• Materials substituted without your approval
• No permits pulled for work that clearly requires them
• Evasive answers to questions about schedule or budget
• Sub-standard workmanship visible during construction that the contractor dismisses

What payment red flags should I watch for?

Payment red flags include: consistent requests for payment ahead of completed milestones, requests to make payment to an individual name rather than the business entity on the license and contract, cash-only demands for ongoing payments, and the contractor refusing to provide lien waivers in exchange for payments. According to the National Consumer Law Center, payment manipulation is the single most common mechanism in contractor fraud cases.

What communication red flags should concern me?

Communication red flags include: the contractor who was responsive pre-contract becomes hard to reach post-signing, instructions being given verbally rather than confirmed in writing, refusal to communicate via email (insisting on phone calls only), and changing the story about why work is delayed. All important communications should be in writing — if a contractor will only communicate verbally, follow up every call with an email summary to create a written record.

What licensing and credentials red flags are most commonly overlooked?

Homeowners frequently miss: a license in the qualifying individual's name rather than the business name (important to verify both), a recently obtained license with no prior history in the state, a license classification that does not match the proposed work (a residential-only license bidding on commercial work), and an expired license the contractor hopes you will not notice. All of these are verifiable through the state licensing board database.

How do I use this checklist before hiring?

Use this checklist as a go/no-go screen before signing any contractor agreement. Start with license verification — CheckLicensed.com verifies contractor license status from official state sources for $14.99, confirming Active status, license classification, and whether any formal complaints are on file. That single check eliminates the most common set of pre-hire red flags before you go any further in the process.