Smart move? Not necessarily.
Here's a dirty little secret: bad contractors want to get fired. That's right. They want you to fire them from your project and better yet, be banned from your property.
Why? Simple. Because when you take the contractor to court he can tell the judge you wouldn't let him on the premises to finish work.
Here's how it works:
Step 1: The contractor will try to get as much money from you up front as possible including offering discounts, time-limited deals on materials or labor, and tried-and-true hard luck stories for needing stage payments ahead of schedule.
Step 2: Meanwhile, the contractor will do as little work as he can get away with. He'll have plenty of excuses for the delays. It seems to be class 101 as taught at the bad contractor training academy.
Step 3: The contractor will do any and every thing to get fired. Expect more excuses, sloppy workmanship, absenteeism...you name it. We've even known of contractors who will intentionally not take out the required building permits and then have someone else call the local authorities to have the project shut down. Why does he care, he's got your money and a day off for fishing.
If you do file a civil suit against the contractor and even if you do win the judgment it is often a waste of time. Try to go after his assets and you'll find the truck is not his but instead leased. His house and equipment will be in the name of his wife.
Since there are likely few assets from the contractor to award to you, judgments are often made based on future earnings. You'll be lucky to get $100 a month from the contractor on the 20k you gave him for your basement remodel. A bad contractor is expert at living under the radar and will quickly find a way to avoid giving you a cent back.
With the housing downturn there are more contractors out of work and who are willing to take on jobs that are outside their specialties. Beware of the lowballers. Your chances of getting your project completed and through inspection decreases while delays and demands for more money increases. The cheapest bid might actually turn out to be the most expensive when all is said and done.
If you've already hired a contractor and find yourself in the position of wanting to fire him, we can't help you much as this is your call in deciding when limiting damage is more important than getting what you paid for.
If you haven't already hired a contractor then your homework is a simple matter of due diligence:
Get references and call them.
-Check the contractor's standing with the BBB.
-Get a contract in your hands and insist on a lien waiver.
-Verify the contractor's license. Don't just look at it. Call it in.
-Don't pay a penny before its due and never everything up front.
-Verify the contractor has liability insurance and is current with it.
-Use a contractor you found from an online service like BestContractors.com. They prescreen their members and minimize your risk.

