You found a project worth bidding. You’ve done the math, you know you can do the work, and your price is competitive. Then you read the bid documents: “Bid security required — 10% of bid amount.” Before your proposal gets a second glance, you need a bid bond. Here is everything you need to know about what a bid bond is, how it works, what it costs, and the things most contractors never find out until they need them.
What Is a Bid Bond?
A bid bond is a surety bond submitted with a contractor’s bid proposal that guarantees two things: the contractor will enter into the contract if awarded, and the contractor will provide the required performance and payment bonds before work begins. It is a form of bid security that project owners require to ensure that only qualified, committed contractors participate in the bidding process.
The bond involves three parties:
| Party | Role |
|---|---|
| Principal | The contractor submitting the bid and purchasing the bond |
| Obligee | The project owner or general contractor requiring the bond |
| Surety | The bond company underwriting and issuing the bond |
In practice, there is a fourth participant: the surety broker, who acts as an intermediary between the contractor and the surety company. Most contractors never deal directly with a surety underwriter — the broker handles the relationship, coordinates documentation, and places the bond with the appropriate market.
Why Project Owners Require Bid Bonds
Before bid bonds were common, project developers frequently awarded contracts to contractors who had underbid their proposals — either intentionally, to win, or through negligence. When the awarded contractor couldn’t follow through at the bid price, the owner had to re-tender the project, eating the cost of advertising, evaluating proposals, and the time delay. Both options were expensive.
A bid bond solves this problem by making the contractor financially accountable for the bid they submit. It protects the owner from the cost of a re-tender, and it pre-qualifies contractors: to obtain a bid bond, the contractor must pass a surety underwriting review, which means an unqualified contractor is filtered out before the first proposal is even opened.
There is also a systemic effect: when contractors know their bids are bonded, low-ball bidding decreases. Owners benefit from more accurate, competitive pricing across the entire bidding pool.
How Bid Bond Claims Work
A claim is filed when the awarded contractor fails to enter into the contract or fails to provide the required performance and payment bonds. The two most common triggers are:
First, the contractor backs out voluntarily after winning — a change of heart, a scheduling conflict, or a better opportunity elsewhere.
Second, the surety declines to write the performance bond. This happens when the contractor overbids their capacity, when there are material changes between the bid and the contract, or when the bid spread between the winning bid and the second-lowest bid is so large it suggests a bidding error. A surety will not write a performance bond it doesn’t believe the contractor can honor, and when that determination comes after the bid is awarded, a claim against the bid bond follows.
The claim amount depends on the bond’s language. Most bid bonds pay the lesser of the full bond amount or the difference between the winning bid and the next lowest bid. A contractor who bid $480,000 on a project where the second bid was $505,000 creates a $25,000 exposure — not the full penal sum of a 10% bond ($48,000). Some bid bonds, however, contain “forfeiture language,” which means the contractor forfeits the entire bond amount regardless of the spread. This distinction matters significantly for both owner protection and contractor risk. Read your bond form before signing.
Whatever amount the surety pays, the contractor must repay in full. The indemnity agreement signed with the bond application creates personal liability for business owners regardless of the contractor’s corporate structure.
Bid Bond Amounts
The required penal sum is expressed as a percentage of the bid amount and varies by project type:
| Project Type | Typical Bond Amount |
|---|---|
| Non-federal public projects | 5%–10% of bid |
| Federal projects (Miller Act) | 20% of bid |
| Private commercial projects | 5%–10%, or owner-specified amount |
For a $500,000 bid on a state highway project with a 10% requirement, the contractor needs a $50,000 bid bond. On a federal project at 20%, the same bid requires a $100,000 bond.
The reason bond amounts are set at 5%–10% rather than 100% of the contract value is that claims don’t expose the owner to the full contract value — only to the difference between the awarded bid and the next available bid. A 10% penal sum is typically sufficient to cover this spread on most competitive projects.
What Does a Bid Bond Cost?
In most cases, a bid bond costs nothing. Many surety agencies issue bid bonds free of charge to qualified contractors. The business logic is straightforward: the surety earns its money on the performance and payment bonds that follow a successful bid, not on the bid bond itself. Offering the bid bond at no cost is an investment in the relationship and the future performance bond premium. Some agencies charge a small flat fee — typically under $100 — but the free model is common and worth asking about.
The important nuance: the cost of the bid bond and the cost of qualifying for the bid bond are different things. A bid bond for a project under $750,000 typically requires minimal documentation — basic application information and a credit check. A bid bond for a project above that threshold requires company financial statements, personal financial statements from owners, and sometimes additional underwriting materials. The bond itself may be free, but the qualification process becomes more involved as the project size grows.
The Critical Warning Most Contractors Never Hear
Getting a bid bond approved does not guarantee you can get the performance bond if you win.
A surety agency that issues a bid bond is essentially stating that your profile is plausible — you look like a contractor who could handle this project. But when the bid is won and the performance bond application is formally submitted, the surety does a deeper review. If your credit or financials don’t support the performance bond at the project size, you win the bid, fail to deliver the performance bond, and face a bid bond claim.
A qualified surety agent will verify your performance bond eligibility before issuing the bid bond. Ask for this explicitly if your agent doesn’t raise it. A bid bond without confirmed performance bond capacity is a liability, not an asset.
Contractors with challenged credit are not necessarily disqualified. SBA-backed surety bonds can help contractors who wouldn’t otherwise qualify, covering projects up to $6.5 million. Ask your surety agent whether this program applies to your situation.
Understanding Your Bond Line
A bond line is the bonding capacity a contractor has established with their surety — the total range of projects the surety is willing to guarantee based on a review of the contractor’s credit, financials, and project history. It has two components:
The single limit is the largest single project the surety will bond. The aggregate limit is the total cost-to-complete of all bonded projects the contractor can carry at any given time.
Contractors who are new to bonded work often don’t know their bond line — and as a result, they bid on projects their surety won’t support. Before submitting a first bid on a bonded project, request a letter of bondability from your surety or broker. This letter is not project-specific and is not binding, but it gives you a realistic picture of the project size range you can pursue based on your current financial profile. A letter of bondability prevents the frustrating situation of investing time in a bid proposal and bid bond application for a project that was never within your capacity to bond.
Bond lines are not fixed. As a contractor completes projects, builds financial strength, and establishes a track record with a surety, the aggregate and single limits grow. Managing that relationship intentionally — by providing timely financial updates, communicating transparently about active projects, and working with the same surety agent consistently — is how contractors earn access to larger projects over time.
Consent of Surety: The Bid Bond’s Companion Document
On some projects, particularly larger public contracts, the project owner requires not just a bid bond but a consent of surety — also called an agreement to bond. This document is submitted alongside the bid bond at the tender stage and commits the surety to provide the required performance and payment bonds if the contractor is awarded the project.
The consent of surety is not technically a bond — it is executed only by the surety company, not the contractor. It is not binding in the same way a bond is. But it adds a layer of pre-qualification assurance that matters to sophisticated project owners: the surety has reviewed the project and is willing to go on record that it will bond the contractor’s performance if they win.
When a project owner asks for a consent of surety, the contractor’s broker must submit the relevant project details to the surety for advance review. The surety evaluates whether it would be willing to write the performance bond at the bid amount for this specific contractor on this specific project — before the bid is awarded. If the answer is yes, the consent of surety is issued. If not, the contractor knows before bidding that this project is outside their current bonding capacity.
How to Get a Bid Bond
Apply for a bid bond through a surety agency — specifically one with experience in contract bonds, not just license bonds. Provide the project details (owner, bid amount, bid date, project duration) and basic information about your business. Receive a quote — for qualified contractors on projects under $750K, approval is often same-day. Pay the premium (often $0 for qualified applicants) and receive your bond. Submit the bond with your bid proposal before the deadline specified in the bid documents.
Swiftbonds issues bid bonds for general contractors, subcontractors, and specialty contractors nationwide. Establishing a relationship with a bond agent before your first bid deadline — not the night before — ensures you have the support to evaluate your performance bond eligibility, understand your bond line, and move through the bonding process without delays.
Swiftbonds LLC
Voted 2025 Surety Bond Agency of the Year
4901 W. 136th Street
Leawood KS 66224
(913) 214-8344
https://swiftbonds.com/
Bid Bond vs. Performance Bond
| Feature | Bid Bond | Performance Bond |
|---|---|---|
| When required | With bid proposal, before award | After contract award, before work begins |
| What it guarantees | Contractor will enter the contract and provide required bonds | Contractor will complete the project per contract terms |
| Typical amount | 5%–20% of bid amount | 100% of contract value |
| Typical cost | $0–$100 flat fee | 1%–3% of contract value |
| When it expires | When contractor enters the contract or bid is rejected | Upon project completion |
In most states these are entirely separate instruments — a bid bond does not convert into a performance bond when the contract is signed. Ohio is a notable exception where automatic conversion occurs under specific circumstances. In all other states, once a bid is won, a separate performance bond application and issuance process is required.
Frequently Asked Questions
What is a bid bond in simple terms? A bid bond is a promise backed by a bond company that a contractor will follow through on their bid — entering the contract and providing performance and payment bonds if they win. If they don’t, the project owner can file a claim to recover the difference between that contractor’s bid and the next available bid.
How much does a bid bond cost? Often nothing. Many surety agencies offer bid bonds free to qualified contractors because the surety expects to earn the performance bond premium if the contractor wins. Some agencies charge a small flat fee, typically under $100, regardless of the bond amount.
Do bid bonds expire? Yes. A bid bond’s obligation is discharged when the contractor either enters into the contract (transitioning to a performance bond) or when the bid is rejected and the project is awarded to someone else. Unused bid bonds are returned and carry no ongoing financial obligation.
Can you withdraw a bid after submitting? Generally no, once bids are opened. Before opening, some project owners will allow corrections at their discretion. A contractor who discovers a significant bidding error after opening but before award may have legal options — including bid rescission or reformation based on unilateral mistake — but this is a legal remedy, not a bond feature, and success depends on the specific circumstances and jurisdiction.
What happens if a surety won’t write my performance bond after I win? The project owner can file a claim against your bid bond. This is why verifying your performance bond eligibility before submitting a bid is so important. A good surety agent does this verification proactively.
Is a bid bond required on all construction projects? No. Bid bonds are required by law on most federal construction projects under the Miller Act and on many state and municipal projects. Private projects may or may not require them — it depends on the owner. The requirement will be stated in the bid documents.
What are alternatives to a bid bond? Some project owners accept a certified check or an irrevocable letter of credit as alternative bid security. These alternatives tie up the contractor’s actual cash or bank credit lines for the duration of the bidding period — a significant disadvantage when bidding multiple projects simultaneously. Surety bonds are preferred because they provide the required security without impacting cash flow.
Can I get a bid bond with bad credit? Possibly, though at higher cost or with additional requirements. SBA-backed surety bond programs exist specifically for contractors who wouldn’t qualify in the standard market. The key issue is not the bid bond itself — it’s whether your credit can support the performance bond. Solve the performance bond eligibility question first.
Conclusion
A bid bond is the entry ticket to bonded construction work — the document that transforms a contractor’s proposal from a number on paper into a credible, enforceable commitment. Understanding what it guarantees, what triggers a claim, how it relates to your performance bond capacity, and how to build a bond line that grows with your business turns a required formality into a strategic tool. Contractors who manage their surety relationships intentionally gain access to larger projects, earn the trust of sophisticated owners, and compete in markets that are effectively closed to the unbonded.
5 Things About Bid Bonds That Most Contractors Don’t Know
- The surety may file liens against your assets as soon as a bid bond claim is received — not after it is paid.Most contractors understand they must repay a paid claim. Fewer know that a surety may take preemptive defensive action the moment a claim lands, including filing liens against business and personal property and demanding collateral before any payment is made. The indemnity agreement that contractors sign when establishing their bond facility typically authorizes these actions. This isn’t punitive — it protects the surety’s ability to recover — but contractors who receive a claim notice should contact their surety broker immediately rather than waiting for the process to play out.
- In the United States, bid bond conventions were shaped in part by Canadian Construction Documents Committee standards that established the 10% norm. The CCDC 220-2002 is the Canadian standard bid bond form that formalized 10% as the typical bid bond amount, based on the observation that the gap between the lowest and second-lowest bid on competitive projects rarely exceeds 10% of the contract value. This standard became widely referenced in US construction practice as well, even though no single US federal document established it with the same clarity. When project owners specify 10%, they are often applying a convention with roots in North American surety industry history rather than a specific legal mandate.
- A surety evaluating a bid bond application compares your bid to the engineer’s estimate — and a large gap is a warning sign that may delay or block issuance. When the project involves a publicly available engineer’s estimate and a contractor’s bid comes in significantly below it, the surety views this as a potential indicator of a bidding error. A contractor who submits a $400,000 bid on a project the engineer estimated at $600,000 should expect questions about whether the scope was correctly priced. Sureties are not just protecting the project owner from contractor abandonment — they are also protecting contractors from committing to bids they cannot honor. Bringing a clear breakdown of costs, sub-bids, and materials quotes to a bid bond application on a large project resolves this quickly.
- A bid bond does not protect a project owner if the awarded contractor’s bid was too low to complete the work — it only protects against the cost difference to the next bidder. This is the most misunderstood limitation of bid bond protection. If a contractor bids $300,000, wins, then abandons the project, and the next-lowest bid was $310,000, the owner recovers $10,000 from the bond — not the $300,000 needed to complete the job. The true risk of an underbid project is borne by the owner after the bid bond claim is exhausted. Owners on high-value projects often address this by requiring performance bonds at 100% of contract value in addition to bid bonds, so that once work begins, full financial protection is in place.
- The bond line that a surety extends to a contractor functions similarly to a business line of credit — and like a credit line, it can be increased through intentional relationship management. Contractors who work with the same surety agent over multiple projects, provide annual financial updates without being asked, notify their agent proactively of project completions and new awards, and resolve any problems transparently build the kind of track record that leads to higher single-project limits and larger aggregate capacities. Contractors who treat bonding as a one-time transaction — getting a bond when required, then disappearing — miss the opportunity to grow their bonding capacity alongside their business. The contractors who win the largest public projects typically have deep, long-standing surety relationships built over years of exactly this kind of proactive engagement.
Leave a Reply