If I weren't in this shade sail business, a method I would do it is to move to the setting up resource business and ask some of the fellas behind the office about personnel who conduct your size task - they sure as heck aren't going to recommend personnel who not necessarily paying their bills and that will be a lifesaver there as well. It's unexpected those men at the setting up source would come to be obtaining kickbacks from personnel. Some of those men will certainly not suggest technicians, but some will. Obtain four or five advice.
We prepare subcontractor contracts for our Standard Service provider construction organization and just before preparing the agreements, definitely check with the condition workplace that gives out builder contractor licenses to make certain they're listed in the trade they say to be proficient in and find if there are any complaints filed. I also contact the status company commission to see if they're outlined now there and how long they've been in business, and then have got their insurance agent to send us a copy of their insurance certificate showing that they have general liability and worker's compensation insurance (and make sure the name of their company on the contract matches the builder's license, the listed corporate entity, and insurance).
And, you definitely want to ensure your contract has start and finish dates with liquidated damages for failure to finish on time, that the contractor supplies all materials and labor, that if the contractor breaches the contract that the contractor will be in charge of your legal fees, progress payments with lien waivers, as well as many other clauses AND a very detailed scope of work. It is important to specify the manufacturer and the precise type/quality & color of shingle, the underlayment brand and quality, the valleys' ice and water shield, tear-off or not of the existing shingles, how much will be charged if the sheathing is rotten per sheet for labor and material and type that it is to be replaced with, disposal of all construction debris, protection of your landscaping and personal property below the roof. I also attach a copy of the manufacturer's installation instructions and state that the product will be installed according to them. I prepare our contract and attach the subcontractor's contract to ours as an addendum (and our clauses supersede theirs). You want to get your scope of work ready to give to contractors to bid on so everyone is bidding on the same thing. When I first started, I would get several bids and cobble together a scope of work and then ask persons to rework their bids based on it if their bids didn't include my new scope of work.
So, this is going to be a large, important expense for you, and you probably want a good attorney, experienced in contracts, to review your contract. It will be worth the couple hundred extra dollars. (Ask how much the cost is up front.)