Bid bonds vs. performance bonds
Bid bonds are necessary at the bidding stage of a contracted job, but they're not the only bonds that will be needed if your bid is accepted. If you're the chosen contractor, your bid bond will be replaced by a performance bond, sometimes called a performance and payment bond, which covers the quality and scope of the work promised.
If your company fails to perform the work that you bid on and won in the time specified and to the terms agreed upon, the performance bond will allow the surety company to compensate the obligee. (The surety company will likely come after you for the damages it paid out, so don't think this is a get-out-of-jail-free card.)