What Is a Bid Bond? The Surety Bond That Guarantees You Mean It
A bid bond is a surety bond submitted with a bid on a construction project, guaranteeing that if the bidder is awarded the contract, they will sign it and provide any required performance and payment bonds. If the bidder refuses to execute the contract after winning, the bid bond pays the obligee (typically the project owner) the difference between the bidder's price and the next-lowest responsive bid, up to the bond's face value.
The underlying policy problem is simple. Without a bid bond, a contractor could submit an unrealistically low bid to win a project, then refuse to honor it after discovering they can't perform profitably at that price. The owner would have to re-bid or negotiate with the next bidder at a higher price — which the defaulted bidder's low bid effectively caused. The bid bond puts a financial consequence on bid-withdrawal, which keeps bidders honest about their pricing.
Bid bonds, performance bonds, and payment bonds are often grouped as 'construction bonds' but serve different purposes at different stages of a project.
The three construction bond types
- Bid bond — guarantees the bidder will execute the contract if awarded; active during the bid period, ends when contract is signed or awarded to someone else
- Performance bond — guarantees the contractor will complete the work per the contract; active during construction
- Payment bond — guarantees the contractor will pay subs and suppliers; active during construction
All three come from the same surety, typically written together when a contractor does public or bonded work. The bid bond is the first one issued; if the bidder wins and signs the contract, the bid bond rolls off and the performance and payment bonds come into force.
The bid bond's face value — sometimes called the penal sum — is typically 5-10% of the bid amount, set by the bid instructions. If the bidder wins and refuses to execute the contract, the surety pays the owner the difference between the winning bid and the next-lowest responsive bid, up to this face value.
Example: a contractor bids $2,000,000 for a project with a 10% bid bond ($200,000 face value). They win, then refuse to sign the contract. The next-lowest bidder was $2,130,000. The owner contracts with the next bidder for $2,130,000, and the bid bond pays the $130,000 difference. The surety then has recourse against the defaulting bidder (and their indemnitors) to recover the payout.
If the next bidder is much higher — say $2,250,000 — the owner's extra cost is $250,000 but the bid bond only covers $200,000. The bidder's refusal can still cost the owner real money beyond what the bond provides, but the bond puts a meaningful financial consequence on the bidder's decision.
Typical scenarios requiring bid bonds
- Federal construction projects over $150,000 — Miller Act requires bid guarantee (though often satisfied via bid bond or acceptable alternative)
- State and local public construction above specified thresholds under state Little Miller Acts
- Larger private projects with institutional owners or financing requirements
- Negotiated private projects where the owner wants assurance during the bid or negotiation period
On smaller public projects or most private construction, bid bonds are not required. The cost/benefit to the owner of requiring a bid bond is substantial only on large projects where a walk-away by the winning bidder would produce meaningful cost or delay.
Bid bonds are typically free or minimal-cost for contractors with established surety relationships. The surety has already underwritten the contractor (for performance and payment bond capacity), so issuing a bid bond is essentially an extension of that underwriting at no marginal cost. Some sureties charge a nominal bid bond fee ($50-$200); many include it in the overall bonding relationship.
The real cost of bidding bonded work isn't the bid bond itself but the performance and payment bonds that follow if the bid is won. Those are priced as a percentage of contract value (typically 0.5-3%) and represent the true cost of bonded work.
For contractors new to bonded work, the surety bonding relationship has to be established before the first bid. A bid bond cannot be obtained on short notice without the surety's prior underwriting. Getting pre-qualified with a surety is itself a process that takes weeks or months — plan accordingly for first entry into public bidding.
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Alternatives to Bid Bonds
Some agencies accept alternative forms of bid guarantee in lieu of a surety bid bond. Common alternatives:
Alternative forms of bid guarantee
- Cashier's check — certified check for the bid bond amount, returned after contract execution (ties up cash during bidding period)
- Irrevocable letter of credit — from a bank, functioning like a bid bond
- Certified check or money order — same function as cashier's check
- Treasury bonds or securities — deposit of government securities equal to the bid guarantee amount
For most active construction bidders, surety bid bonds are the more efficient choice because they don't tie up capital. Cashier's checks and certified securities lock up funds during the bid period and re-check period that could otherwise be working capital. But for contractors new to bidding who haven't yet established surety relationships, cashier's checks provide a path to bid on specific projects while surety qualification is pursued for the longer term.
After bid opening, the bid bonds of unsuccessful bidders are typically returned or released quickly — often the same day. The winning bidder's bid bond stays in force until the contract is executed and the performance and payment bonds are provided. Once the substitution bonds are in place, the bid bond is released.
If the award process is contested (protest filed, award not made within a specific window), the bid bond may need to be extended. Extensions are typically handled with the surety and the owner as a procedural matter without re-underwriting.
For contractors without sufficient bonding capacity, some projects are simply out of reach. A contractor with $5M single-project bonding capacity can't bid a $20M project regardless of whether they could perform the work. This capacity limitation is often the binding constraint on contractor growth, which is why expanding bonding capacity (addressed in our separate post on bonding capacity growth) is a strategic investment.
For contractors who do qualify, the bid bond is a routine procedural step that signals the bidding is serious. For contractors who don't, the bonding gap defines the commercial boundary of what they can pursue. Growing past that boundary is a specific strategic project, not an automatic growth pattern.
Bid bonds are the surety mechanism that makes public and large-private bidding work. They give owners confidence that bidders will honor their prices, provide a financial consequence for walk-aways, and establish the surety relationship that will eventually produce the performance and payment bonds on the actual contract. For contractors, the bid bond is the routine procedural document that signals serious intent to perform; getting it right is straightforward once the surety relationship is established.
Written by
Jordan Patel
Compliance & Legal
Former corporate counsel specializing in construction contracts and tax compliance. Writes about the documentation layer — COIs, W-8/W-9, certified payroll, notice-to-owner deadlines — and the legal backbone behind audit-ready AP.
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