What is a bid bond?

STA 0+120What a bid bond actually covers

A bid bond is submitted with the bid itself, not after award. It puts the surety on the hook for a stated amount, or a percentage of the bid price, if the contractor wins the tender and then refuses to sign the contract or fails to provide the performance and payment bonds the tender requires. It does not cover the quality of the finished work or a contractor's performance during construction — it exists purely to keep bidders honest about their intent to actually take the job if they win it. An owner who is left without a signed contract because the low bidder walked away can draw on the bid bond to cover the cost of re-tendering or accepting the next-lowest bid.

STA 0+240Bid bond, performance bond and payment bond

The performance bond and the payment bond are usually issued together, often each set at 50% or 100% of the contract price depending on the owner's requirement, and both typically run for the length of the contract plus a warranty period. A bid bond's job ends the moment the contract is signed and the other two bonds are in place; it does not carry through construction.

STA 0+360Bid bond vs agreement to bond

Some tenders accept an agreement to bond (sometimes called a consent of surety) instead of a fully executed bid bond. It is a letter from the surety confirming it is prepared to issue the performance and payment bonds for that specific project up to a stated penal sum, if the contractor is awarded the work. It signals the same thing a bid bond does — that a surety has assessed the contractor and is prepared to stand behind it — without the paperwork of a full bond at the bid stage. Read the tender document carefully: some owners accept either instrument, and some ask for both a bid bond and a separate agreement to bond covering the performance and payment bonds to come.

STA 0+480What determines how much bonding a contractor can get

A surety is not pricing risk on a single job in isolation; it is underwriting the contractor as a business. The factors that move a surety's decision are broadly consistent across the industry: financial statements and working capital, the contractor's current work-in-progress schedule (how much bonded work is already outstanding), bank references, the experience and stability of the management team, and the contractor's claims and completion history. A contractor with strong financials but a thin track record on projects this size, or one that is already carrying a large volume of bonded work relative to its capital, may find its bonding capacity is the limiting factor on how large a tender it can bid — well before price becomes the issue. Building a relationship with a surety broker before a large tender closes, not during bid week, is what actually expands that capacity over time.

Bonding capacity is usually expressed two ways: a single-project limit (the largest job the surety will bond at once) and an aggregate limit (the total value of bonded work the contractor can carry across every active project combined). A contractor can be well within its single-project limit and still be unable to bond a new job because its aggregate limit is tied up in other work that has not finished and released its bonds yet. Tracking both numbers, not just the size of the job in front of you, is part of deciding whether to bid at all.

STA 0+600How bonding compares to a statutory holdback

A bond and a statutory holdback solve different problems and are not substitutes for each other. A bond is a third party's promise, triggered only if the contractor fails to perform or pay; a holdback is money the owner (or a contractor further up the chain) is required by law to retain from every payment, regardless of whether anything has gone wrong. Alberta's statutory holdback, for example, is a flat 10% withheld from every payment until lien rights expire¹, running in parallel with whatever bonding the tender required. See construction holdbacks for the rate and release timing in each province, and prompt payment and adjudication for how the rest of an invoice is supposed to get paid on time.

STA 0+720When a tender asks for a bond

Bonding is close to universal on Canadian public civil tenders of any real size, and the requirement is stated directly in the tender document, usually as a percentage of the bid price for the bid bond and a percentage of the contract price for the performance and payment bonds. See bidding on public tenders for where those tenders are posted and how they get evaluated. A tender that skips a bonding requirement is more the exception than the rule once the contract value moves past a small local job, because the owner is otherwise carrying the entire risk of a contractor default with no third party standing behind it. A private owner may waive bonding for a smaller job, but even then, a bonded contractor is often able to demonstrate a level of financial standing an unbonded one cannot, simply because a surety already underwrote it.