Bonding capacity, more than licence class or crew size, sets the ceiling on the public work you can pursue. Understanding how sureties decide that number is the difference between chasing achievable contracts and wasting weeks on ones you were never eligible for.
A bid bond is a guarantee from a surety company that if you are awarded the contract, you will enter into it at the price you bid and provide the required performance and payment bonds.
It protects the owner from a bidder who submits a low number, wins, then discovers a mistake and walks away — leaving the agency to re-award at a higher price. If that happens, the bid bond covers the difference between your bid and the next acceptable one, up to the bond amount.
Bid bonds are typically five to ten percent of the bid amount, and the solicitation states which. Some agencies accept a certified cheque or letter of credit instead for smaller contracts.
| Bond | What it does |
|---|---|
| Bid bond | Guarantees you will sign the contract at your bid price and produce the other bonds. Submitted with your bid. |
| Performance bond | Guarantees you will complete the work per the contract. Usually 100% of contract value. Provided on award. |
| Payment bond | Guarantees your subcontractors and suppliers get paid. Usually 100% of contract value. Provided on award. |
They are a package. A surety issuing your bid bond is committing in principle to the performance and payment bonds behind it, which is why the bid bond is not a formality — it represents a real underwriting decision already made.
Bid bonds are frequently issued at no charge, or a nominal fee, by a surety who expects to write the performance and payment bonds if you win.
Performance and payment bonds are where the cost sits, typically one to three percent of contract value, varying with your financial strength, experience, and the size and nature of the job. A well-established contractor with strong financials pays at the low end; a newer firm pays more, and may not be able to obtain bonds at all initially.
That cost is a line item in your bid. Contractors new to public work sometimes forget to include it and discover the omission after award.
Surety underwriting is often described as the three Cs, and understanding them tells you what to work on.
Your balance sheet. Working capital and net worth are the primary constraints on how much bonding you can obtain. A common rough guide is that single-job capacity runs around ten times working capital and aggregate capacity around twenty times, though every surety underwrites differently.
This is why bonding capacity grows slowly — it tracks retained earnings, and retained earnings take years.
Whether you can actually do the work. Relevant completed projects of similar size and type, equipment, key personnel, and your current backlog. A surety will not bond a contractor into a job substantially larger than anything they have completed.
Your track record and reputation. Completed jobs, claims history, relationships with subcontractors and suppliers, and personal credit of the owners. Sureties talk to each other and to the industry.
The practical implication: bonding capacity is built deliberately over years, not obtained when you need it. A contractor who wants to bid $2M public work in three years should be establishing a surety relationship now on smaller jobs.
If you have never been bonded, the path is roughly this:
The Small Business Administration operates a Surety Bond Guarantee Program that backs a portion of the surety's risk on contracts up to a statutory limit, making bonds available to small and emerging contractors who could not obtain them otherwise.
If a surety has declined you on capital grounds, ask specifically about the SBA programme — participating agents can often place bonds through it that they could not place conventionally.
Two numbers govern what you can pursue: single-job capacity, the largest contract your surety will bond, and aggregate capacity, the total bonded work you may have running at once.
Aggregate is the one contractors forget. Winning a large job can consume your capacity and leave you unable to bond anything else until it progresses. Sequencing matters, and it is worth discussing with your agent before bidding a job that would fill your book.
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