Make sure they are insured. Small, one or two man companies often have the lowest prices but also are risky. Some of those might be excellent, but many don't know what they're doing because they do lots of things not just roofing, and they don't have as much equipment.

My next door neighbor liked his company, but he recommended not paying the entire amount up front. You can often get a deal by doing so, but he said you don't know for sure what you're getting until you've had a good rain. Even good companies occassionally need to fix their work. There was one spot they needed to fix and because he paid everything up front, the company was not in a hurry to come and fix that part.

I have also found that i can get great advice on which people to use for anything – roofing, plumbing, electrical, etc. – that the people at my local hardware store know who's really good and who isn't because they hear it all from their customers. But then, i'm in a small town and it's an independent hardware store. The people at the church also knew who was good and who wasn't because they had four buildings and had used lots of local contractors until they found ones that were great and they'd go back to them again and again, so you might try asking your church secretary for a recommendation, too.

A legitimate business needs to make a profit to stay in business. In order to stay in business over the long haul, the business must pay taxes, carry liability and worker's compensation insurance, and pay other normal operating expenses. This usually means that their prices are somewhat higher than the guy who works out of the back of his truck for cash.

Unfortunately, many homeowners make their buying decisions based on the cheapest price. They are often burned when an uninsured workman is hurt on their job and the only way to recover damages is to sue the homeowner. They are also frustrated when they can't find the contractor a year or two later for a warranty claim. In some cased, they are forced to pay for materials twice when a supplier files a lein against the homeowner's property because the "contractor" failed to pay for the material.

Contractor complaints like these will be among the top three types of complaints received by your state's Attorney General's Office (usually the division of Consumer Affairs). The only way you can assure that these problems do not befall you is to deal with reputable contractors.

My advice is to decide what brand and color shingles you want on your house before you contact roffing contractors for a price. This ensures that each is bidding based on the same criteria. At a minimum, I recommend screening contractors using the following criteria:

1) Make sure the contractor has been in business for at least ten years. This demonstrates in a very real way that the contractor is on the up and up.

2) Ask for, and check out references in your area. Previous customers will usually be very glad to tell you their experience with a contractor.

3) Insist that a contractor furnishes you with a Certificate of Insurance proving that they are covered by general liability and Worker's Compensation Insurance. The Certificate must be mailed to you by the contractor's insurance carrier because it is just too easy for a clever contractor to phoney up a copy.

4) Make sure that any warranty on workmanship is in writing. They will usually provide a separate manufacturer's warranty on materials.

5) Make sure that all of the details of the job are spelled out in writing in the contract.

6) Do not give a contractor more than a 10% downpayment when you sign the contract. Contractors who ask for more money "so they can buy materials" should send up an alarm that you shouldn't ignore. You can bet that a contractor who demands a large downpayment has no working capital and will soon be out of business. Do not pay the contractor the balance owed until the entire job is done to your satisfaction. Once they are paid in full, you lose all leverage in getting them back to finish up the job.

Keep in mind that this is a highly competitive business and a contractor who charges very high prices will not be in business very long. The prices from legitimate contractors will usually be very close if they are all bidding on exactly the same work.

I hope this information helps you make your decision.

Good luck with your roofing project.