What Is a Bid Bond? (And When You Need One)

A bid bond is a guarantee that if you win the bid, you'll actually sign the contract and provide any required performance and payment bonds. It's issued by a surety company, it typically runs 5 to 10 percent of your bid amount, and on most public construction work it's not optional. No bond in the envelope, no bid. Agencies check for it at the bid opening, and a missing or defective bid bond is one of the fastest ways to get a low bid thrown out.

Let's unpack what it actually does, what it costs, and how you get one.

What does a bid bond actually guarantee?

Think about the agency's risk for a second. They run a sealed bid process, open the envelopes, and award to the low bidder. Then the low bidder looks at their own number, realizes they left out the electrical work, and walks away. Now the agency has to award to the second bidder at a higher price, and the whole schedule slips.

The bid bond covers that gap. If you're awarded the contract and refuse to sign, or can't produce the required performance and payment bonds, the agency can claim against your bid bond, generally up to the bond amount or the difference between your bid and the next bidder's. The surety pays the agency, and then the surety comes after you, because every bond you get is backed by an indemnity agreement where you (and usually you personally, not just your company) promise to pay the surety back.

That's the thing new contractors miss about bonds. A bond isn't insurance for you. It's a guarantee for the agency, with your assets standing behind it. Which is exactly why agencies trust it: a surety put real underwriting behind the promise that you're good for the job.

How much does a bid bond cost?

Here's some good news. Bid bonds themselves are usually cheap or free. Most sureties issue bid bonds at no charge or for a small flat fee for contractors in their program, because the real business is the performance and payment bonds that follow an award. The bond amount (the 5 to 10 percent figure) is the guarantee limit, not what you pay. The exact percentage is set in the solicitation, so read it. Some agencies accept alternatives like a certified or cashier's check for the same amount, but tying up cash that way is usually worse than just getting the bond.

How do you get one?

Through a surety, and almost always through a surety bond agent or broker rather than directly. The process looks like this:

1. Find an agent who works with contractors on public work. Ask other contractors in your trade who they use, or ask your insurance agent for a referral.
2. Get prequalified. The surety underwrites you like a lender would. Expect to hand over business financials, references, information on your work history, and details on the specific job. For small bonds, many sureties have fast programs based mostly on personal credit.
3. Request the bid bond for the specific solicitation, with the exact solicitation number, the bid date, and the bond percentage. The surety issues the bond, you sign it, and the original goes in with your bid.

Start this well before your first bid, not the week it's due. First-time prequalification can take a while, and a surety relationship is really a capacity relationship: they'll set a single job limit and an aggregate limit for how much bonded work you can carry. As your financials and track record grow, those limits grow, and so does the size of work you can chase.

One practical warning: sureties won't bond a job they don't think you can perform. If you can't get a bid bond for a project, that's the surety telling you something. Listen.

What about performance and payment bonds?

Bid bonds travel with two siblings you'll meet the moment you win.

A performance bond guarantees you'll complete the work per the contract. If you default halfway through, the surety steps in to get the job finished, then recovers from you. A payment bond guarantees your subcontractors and suppliers get paid, which matters on public work because subs generally can't lien government property the way they can on a private job. Both are commonly required at 100 percent of the contract price on public construction, and unlike bid bonds, these cost real money, a premium based on the contract value and your rates.

Price that premium into your bid. It's a legitimate cost of the work, and forgetting it is a classic rookie mistake.

When do you actually need a bid bond?

Rules vary by state and agency, so the only answer that counts is the one in the solicitation documents. But some general patterns hold. Construction and public works bids require bid bonds far more often than anything else, especially above certain dollar thresholds that vary by jurisdiction. Federal construction work has its own bonding requirements under the Miller Act, and most states have similar "little Miller Act" laws for state and local projects. Supply and service bids often skip the bid bond entirely, though some agencies use bid deposits or other security even there.

So the habit to build: every time you download a solicitation, check the instructions to bidders for bond requirements before you spend an hour on anything else. If a bond is required and you don't have a surety relationship yet, that's your critical path, not the estimate.

And triple-check the mechanics. The bond has to be the right percentage, on the agency's form if they specify one, signed by both you and the surety's attorney-in-fact, usually with the power of attorney attached, and physically (or electronically) included with the bid. Agencies reject bids over defective bonds all the time, and unlike a price you second-guess, this one's completely avoidable.

Where do you find bonded work worth chasing?

If you're set up with a surety, public construction is where that investment pays off, because bonding requirements thin out the competition. Plenty of contractors never get prequalified, which means every bonded job has fewer bidders than an unbonded one. See How to Find Government Construction Bids for where these jobs get posted and how to track them, and Why Bids Get Rejected: 10 Common Mistakes for the paperwork traps that catch bonded bids specifically.

Ready to look? Browse open government construction bids across all 50 states at govbidspro.com/categories/construction, or set up a free email alert so bonded jobs in your state and trade land in your inbox the day they post.