You should not sign any contract that does not specify the total or full price of the work to be done. To be sure, the contract should list itemized costs for materials and labor. But the contract should also state the final total price for the work. Unscrupulous contractors have been known to manipulate contracts and argue that the contract reflects only an estimate or only partial costs. You can protect yourself from price increases by insisting on a total price in the contract and holding the contractor to that price.

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If you found this tip helpful, you might also want to read this:
Introduction to Contracts
Contract Checklist
Make sure you get a release of liens from all material and service providers