A bid bond is a may provide from a bank or bonding company that a contractor will honor the price they quoted if they win a project

When a construction company or contractor bids on a public project—a school renovation, a highway repair, a municipal building—the government agency running the project often requires a bid bond. This is a written promise, backed by a bank or bonding company, that says: if you win this contract, you will sign the actual construction contract at the price you quoted. If you refuse or fail to do that, the bonding company will pay the agency a penalty, usually equal to the bid amount itself.

The bid bond protects the agency from a contractor who bids low to win, then walks away or demands more money before starting work. It is not insurance. It is a financial may provide that sits between the contractor and the agency, enforced by a third party with money at stake.

Key Takeaways

  • A bid bond guarantees that a contractor will sign the construction contract at the bid price if they win; if they refuse, the bonding company pays the agency a penalty.
  • Bid bonds are required on most public construction projects above a certain dollar threshold, which varies by state and agency but often starts at $25,000 to $100,000.
  • The contractor pays the bonding company a premium—typically 1 to 3 percent of the bid amount—whether they win or lose the project.
  • The bank or bonding company investigates the contractor's financial health and track record before issuing the bond, so not all contractors can obtain one.
  • A bid bond is different from a performance bond, which guarantees the contractor will actually complete the work after the contract is signed.

Who requires bid bonds and why

Federal, state, and local government agencies require bid bonds on public construction projects. The threshold varies: federal projects almost always require them; many states require them on projects above $25,000 to $100,000; some cities have their own rules. Private owners—a corporation building an office, a developer building apartments—rarely require bid bonds, though some do.

The reason is straightforward. A government agency opens bidding to multiple contractors, receives sealed bids, and awards the contract to the lowest may have access to bidder. Without a bid bond, a contractor could bid $500,000 to win, then refuse to sign the contract or demand $600,000 instead. The agency would have to re-bid the project, lose time, and possibly pay more. A bid bond forces the contractor to honor their word or face a financial penalty.

How a bid bond works in practice

The contractor contacts a bonding company or bank and requests a bid bond for a specific project. The bonding company reviews the contractor's financial statements, credit history, past projects, and references. If they approve, they issue the bond—a document stating they will may provide the contractor's bid up to the bond amount.

The contractor includes the bid bond with their sealed bid when they submit it to the agency. If the contractor loses the bid, the bond expires and nothing happens. If the contractor wins, they must sign the construction contract at the bid price within a set timeframe—usually 10 to 30 days. If they sign, the bid bond is released and replaced by a performance bond, which guarantees they will finish the work. If they refuse to sign, the bonding company pays the agency the penalty—typically the full bid amount or a percentage of it.

The contractor pays the bonding company a premium for issuing the bond, whether they win or lose. This premium is usually 1 to 3 percent of the bid amount, though it can be higher for contractors with weak credit or limited track record. A $500,000 bid might cost $5,000 to $15,000 in bond premiums.

The difference between bid bonds and performance bonds

A bid bond covers only the bidding phase—it guarantees the contractor will sign the contract. A performance bond covers the construction phase—it guarantees the contractor will actually do the work, on time and to specification. Most public projects require both.

Here is the sequence: the contractor obtains a bid bond and submits it with their bid. If they win, they sign the construction contract and the bid bond expires. They then obtain a performance bond, which the agency holds for the duration of the project. If the contractor fails to complete the work or abandons the site, the bonding company steps in to finish it or pay the agency the cost of hiring someone else.

Who issues bid bonds

Bid bonds are issued by surety bonding companies—specialized firms that underwrite bonds for contractors. Examples include Liberty Mutual Surety, Travelers Bond, CNA Surety, and Fidelity & Deposit. Some banks also issue bonds, though most refer contractors to a surety company.

A surety company is not the same as an insurance company. Insurance protects the policyholder against loss; a surety bond protects the project owner against the contractor's failure. If the bonding company pays a claim, they typically pursue the contractor for repayment.

To obtain a bid bond, a contractor must have a relationship with a surety company or work through a broker who does. The surety company will require financial statements, tax returns, bank references, and a list of past projects. Contractors with strong financials and a solid track record get bonds quickly and at lower premiums. New contractors or those with weak credit may be denied or charged much higher premiums.

What happens if a contractor refuses to sign after winning

If a contractor wins the bid but refuses to sign the construction contract at the bid price, the agency files a claim with the bonding company. The bonding company investigates—they may contact the contractor to understand why they are refusing—but if the refusal is confirmed, they pay the agency the penalty amount.

The penalty is usually the difference between the winning bid and the next-lowest bid, or a fixed percentage of the bid amount, depending on the bond terms. If the winning bid was $500,000 and the next bid was $550,000, the penalty might be $50,000. The bonding company pays this to the agency and then pursues the contractor for repayment, often through legal action or by withholding payment on future bonds.

This is rare. Most contractors who bid on public projects understand the bid bond requirement and plan to honor their bid if they win. But it happens when a contractor miscalculates costs, discovers they underestimated labor or materials, or straightforward changes their mind about the project.

The cost of bid bonds and how they affect bidding

The premium a contractor pays for a bid bond—1 to 3 percent of the bid amount—is a real cost that affects their bottom line. A contractor bidding on a $1 million project might pay $10,000 to $30,000 in bond premiums across multiple bids, even if they win only one.

This cost is usually built into the bid price. If a contractor bids on 10 projects and wins 2, they have paid bond premiums on all 10. The cost of the 8 losing bids is absorbed by the 2 winning projects, which means the contractor must bid slightly higher to cover it. This is one reason public construction projects often cost more than private ones—the bonding requirement adds a layer of cost and complexity.

Contractors with strong credit and a long track record pay lower premiums, sometimes 0.5 to 1 percent. New contractors or those with financial problems may pay 3 to 5 percent or be denied bonds altogether. This creates a barrier to entry for small or new contractors, which is why some government agencies have programs to help them access bonding at lower cost.

Frequently Asked Questions

Is a bid bond the same as a bank may provide?

A bid bond is a type of bank may provide or surety bond. The term "bank may provide" is broader and can refer to any written promise from a bank or bonding company to pay if a contractor fails to perform. A bid bond is specifically a may provide that the contractor will sign the contract at the bid price.

Can a contractor get a bid bond if they have bad credit?

It depends on the surety company and the contractor's overall financial picture. A contractor with bad credit but strong cash flow and a solid project history may still may have access to. Those with very poor credit or no track record will likely be denied or charged much higher premiums. Some bonding companies specialize in higher-risk contractors.

What if the bonding company goes out of business?

Surety companies are regulated by state insurance departments and must maintain reserves to cover claims. If a surety company fails, the state insurance commissioner typically steps in to may support claims are paid. The agency holding the bond is protected; the contractor may face delays but should not lose coverage.

Do private construction projects ever require bid bonds?

Rarely. Most private owners do not require bid bonds because they are not spending public money and can negotiate directly with contractors. Some large private developers or corporations do require them, especially on major projects, but it is not standard practice.

What is the difference between a bid bond premium and the penalty amount?

The premium is what the contractor pays the bonding company to issue the bond—usually 1 to 3 percent of the bid amount. The penalty is what the bonding company pays the agency if the contractor refuses to sign the contract—usually the full bid amount or the difference between bids. The contractor pays the premium regardless of outcome; the penalty is paid only if a claim is filed.