Door-to-Door Contractor Scam: "I Noticed a Problem With Your House"

There's a knock at the door. A friendly contractor says he was working down the street and noticed something wrong with your roof — or your foundation, siding, or driveway. He offers to take a quick look, free of charge. Minutes later, he's describing a serious problem that needs immediate attention.

This is one of the oldest contractor tactics in the book, and federal consumer agencies specifically warn about it: be wary of any contractor who shows up uninvited claiming to have spotted trouble with your home.

How it works

The visit usually follows a script. First, the contractor establishes credibility: "We just finished a job on your street." Then comes the free inspection — which is really a sales pitch. Once on your roof or in your crawl space, where you can't easily verify what he's pointing at, he "discovers" damage: missing shingles, a cracked foundation, a failing system.

Then the pattern kicks in: the problem is serious (fear), it needs handling now (urgency), and wouldn't it be convenient to just let him take care of it today (financial commitment)? The whole encounter is engineered so that he is both the person who found the problem and the person who gets paid to fix it.

Red flags

• A contractor knocks on your door without you calling them
• Claims he "was working in the neighborhood" or "noticed something from the street"
• Offers a free inspection on the spot and finds urgent damage within minutes
• Pressures you to decide before he leaves
• Can't — or won't — provide a license number you can verify independently

What to do instead

• Don't let an unsolicited visitor inspect your home. A polite "no thank you" is a complete sentence.
• If you're genuinely concerned about your roof or foundation, hire your own inspector — someone with no financial interest in finding problems.
• Never hire a contractor who found you. You find the contractor, through referrals, reviews, and verified licenses.
• Remember the golden rule: never let the person who discovers the problem be the only person who gets paid to fix it.