Avoid Losing 5–20%: Bid Bonds for Contractors, FAR & Underwriting

A bid bond is a three-party agreement, among the contractor (principal), the project owner (obligee), and a surety company, that guarantees the winning bidder will sign the contract and provide any follow-on bonds required. The penal sum typically runs between 5% and 20% of the bid price, and federal thresholds and owner practices both shape when one is required.

TL;DR:

• Federal projects generally require a bid bond of around 20%, while private and municipal jobs often specify between 5% and 10%.
• The main cost of a bid bond is the underwriting review, not the bond premium, which is usually minimal or zero.
• Claims are limited to the difference between the defaulting bid and the next-lowest bid, up to the penal sum, which influences your future bonding capacity.
• Proper early preparation of financial and project documentation speeds up the bonding process and helps maintain bonding capacity.
• Consistently reviewing bonding requirements before bid deadlines and maintaining good contractor relationships prevents missed opportunities.

Table of Contents

• How bid bonds work during the bidding process
• When bid bonds are required: federal, municipal, and private work
• Penal sum percentages and how sureties price the bond
• Applying for a bid bond: what sureties want to see
• What happens if a claim is made
• Bid bond vs performance bond vs payment bond
• Practical tips for managing bid bond paperwork
• Why a conservative bonding strategy protects your business
• FAQ
• Sources

How bid bonds work during the bidding process

A bid bond is not an insurance policy. It is a credit instrument backed by a surety that puts its own money behind a contractor’s promise, which means the surety expects repayment if it ever has to pay a claim, according to NASBP guidance on contract surety bonds. The three roles stay fixed throughout the process: the principal submits the bid, the obligee (the project owner) receives the protection, and the surety stands behind the principal’s commitment.

The penal sum, the maximum amount the surety will pay, is set as a percentage of the bid amount and stated directly in the bid documents. Owners typically calculate damages as the difference between the defaulting bidder’s price and the next-lowest responsive bid, and NASBP’s guidance for architects notes that surety liability is usually capped at that penal sum rather than the full contract value.

Claims arise in a narrow set of situations:

• The winning bidder refuses to sign the contract after award.
• The winning bidder fails to provide the required performance and payment bonds.
• The bidder withdraws or alters the bid after the deadline in a way the owner treats as a default.

Owners specify exact bond terms, percentage, form, and deadline, inside the solicitation package, often using a standardized form such as SF 24 on federal work under FAR Subpart 28.1. Reading that language closely before submitting a bid avoids disqualification on a technicality.

When bid bonds are required: federal, municipal, and private work

Federal procurement rules make the requirement predictable. Under FAR Subpart 28.1, a bid guarantee is required whenever the solicitation also requires a performance bond, which covers most federal construction contracts above the simplified acquisition threshold. Private and municipal owners have more discretion, and practice varies by project type and local custom.

• Federal construction contracts generally require a bid bond whenever a performance bond is also required.
• Private owners and municipalities commonly set their own percentage bands and may skip the requirement on smaller jobs.
• Subcontractors are sometimes asked for bid security on large trade packages, though many general contractors waive it for smaller subcontracts.
• Emergency procurements, certain foreign-assistance projects, or small purchases may carry waivers or reduced bonding requirements.

Checking the solicitation’s bonding clause early tells you whether you need to start the underwriting conversation before you finish pricing the job.

Penal sum percentages and how sureties price the bond

Penal sums commonly fall between 5% and 20% of the bid value, with federal solicitations frequently specifying 20% under the structure set out in FAR Subpart 28.1. Private owners and municipalities more often land in the 5% to 10% range, though the exact figure is always spelled out in the bid documents rather than assumed.

Underwriting, not a separate premium, is usually the real cost of a bid bond. According to Autodesk’s construction guidance, sureties often issue bid bonds with little or no direct charge, since the bond is a precursor to the larger performance and payment bonds that follow a win. The cost that matters is the underwriter’s time reviewing your financials, and the indemnity exposure you accept by signing the surety agreement.

When budgeting for a bid, build in time for underwriting review, understand that you are personally and corporately on the hook through indemnity clauses, and don’t assume a quoted premium on the performance bond will match what you paid on a past project with a different surety.

Applying for a bid bond: what sureties want to see

Sureties evaluate the contractor, not just the project, so your paperwork needs to show financial stability and a track record.

1. Gather current financial statements, typically two to three years, along with interim statements if your fiscal year end is not recent.
2. Document your bank line of credit and working capital position.
3. Prepare a backlog summary showing active contracts and expected completion dates.
4. List trade and bank references the surety can contact directly.
5. Confirm your contractor license and any required certifications are current.

For contractors who bid often, an annual or continuous bond program is usually more efficient than requesting a single-project bid bond every time. According to NASBP’s guidance for small contractors, annual programs let the surety evaluate your overall capacity once rather than underwriting each bid separately, which cuts per-bid turnaround time. An established relationship with a surety broker also speeds approval, since repeat underwriting history replaces a cold review.

Pro Tip: Ask your broker to pre-qualify you for an annual bonding line before bid season gets busy, so a bond request never becomes the reason you miss a deadline.

Underwriting timelines vary, but a contractor with clean financials and an existing surety relationship can often get a bond issued within days; a first-time applicant or one with weaker financials should expect a longer review and should flag urgent bid deadlines to the broker immediately.

What happens if a claim is made

A claim against a bid bond has real financial consequences beyond the immediate project.

• The obligee typically claims the difference between the defaulting bid and the next-lowest responsive bid, up to the penal sum.
• The surety pays the claim first, then looks to the contractor for reimbursement under the indemnity agreement signed when the bond was issued.
• A paid claim becomes part of your underwriting history and can reduce future bonding capacity or raise scrutiny on later applications.
• Contractors can contest a claim they believe is unjustified, though disputing it usually involves legal costs and does not pause the surety’s right to seek indemnity in the meantime.

Because indemnity agreements are broad, the practical lesson is to treat every signed bid as a binding commitment, not a placeholder you can walk away from if a better opportunity appears.

Bid bond vs performance bond vs payment bond

These three bonds protect different moments in a project and different parties, even though owners often bundle requirements for all three.

• A bid bond guarantees the contractor will sign the contract and provide follow-on bonds if awarded the work.
• A performance bond guarantees the contractor will complete the project according to the contract terms, protecting the owner through construction.
• A payment bond guarantees subcontractors and suppliers get paid, protecting parties further down the supply chain rather than the owner directly.

Under FAR Subpart 28.1, federal solicitations that require a performance bond also require a bid guarantee, and the Miller Act extends that logic to payment bonds on federal construction contracts. Private owners frequently mirror this structure, requiring all three as a package to prequalify bidders before work begins rather than evaluating bonding capacity piecemeal.

Practical tips for managing bid bond paperwork

Sureties respond to clear documentation, so a financial package that leads with backlog, current ratio, and work-in-progress schedules will move faster through underwriting than one that buries those figures in a stack of statements. Pursuing an annual bond program once your bidding volume justifies it removes the friction of a fresh application every time a solicitation closes.

When a bid bond clause seems unusually strict, such as a 20% penal sum on a modest private job, it is worth asking the owner whether a lower percentage or an alternative form of bid security is acceptable; owners sometimes have more flexibility than the boilerplate suggests.

Paperwork volume is often the real bottleneck for smaller contracting shops without a dedicated bid team. Eligibility checks, document assembly, and compliance formatting across multiple solicitations can eat hours that a small crew would rather spend estimating or building. Automation tools that handle eligibility matching and application assembly for tenders and grants can take that administrative load off a contractor’s desk, which is one efficiency option worth exploring if paperwork is slowing down your bidding process.

Pro Tip: Keep a standing folder of your current financial statements, license copies, and references so you can respond to an urgent bid bond request without scrambling.

Why a conservative bonding strategy protects your business

Treating a bid bond request as an early warning, not a last-minute formality, keeps your bonding capacity intact and your reputation with sureties clean. Contractors who read the bonding clause the day a solicitation drops, and call their broker before pricing is final, rarely get caught short on a deadline.

The habit that actually prevents claims is simple: never submit a bid you are not prepared to honor if you win. Review your bid documents early, confirm your follow-on bonding capacity before you price the job, and keep your broker in the loop on every active pursuit.

— Matevz

FAQ

What does a 5% bid bond mean?

A 5% bid bond means the penal sum, the maximum the surety will pay if the contractor defaults, equals 5% of the submitted bid price. Private and municipal owners commonly set bands in the 5% to 10% range, while federal solicitations often specify a different percentage under FAR Subpart 28.1.

Do you get bid bond money back?

A bid bond is not a cash deposit, so there is no sum to return once the bid process closes. If you win and sign the contract along with any required follow-on bonds, the bid bond simply expires with no claim made against it.

What is the point of a bid bond?

A bid bond protects the project owner by guaranteeing that the winning bidder will sign the contract and provide the required performance and payment bonds, according to NASBP’s overview of surety bonds. It also works as a prequalification filter, since a surety’s willingness to bond a contractor signals financial credibility to the owner.

How much should a bid bond be for?

Federal construction work often lands at the higher end of that range under FAR Subpart 28.1, while private and municipal owners more often set lower percentages.

Sources

For specifics beyond this overview, consult FAR Subpart 28.1 for federal bonding clauses, the SBA’s surety bond program page for small business guarantees, and NASBP’s bonding guidance for practitioner-level Q&A on bid bond mechanics.

• Autodesk Construction: Bid bonds explained