Why you should be skeptical of door-to-door salespeople Published: July 12, 2021 5:02 PM EDT Updated: July 12, 2021 5:05 PM EDT Recommended With so many people doing home improvements, contractors are busier than ever. It could be months before they can take on your project, then comes a knock on your door offering to take the job on the spot. It may seem like a bygone era, but door-to-door salespeople are around, and there are some red flags to watch out for if one shows up at on your doorstep. A common tactic is to say they’re a contractor with extra supplies and can offer you a really good deal. It could be on building supplies, painting, driveway paving, roofing or pest control, among other things.