If you're a contractor in Ontario and you've just been asked to submit a bid bond or performance bond as part of a public tender, you're probably wondering what exactly you're signing up for and whether your current insurance already covers it. It doesn't. Surety bonds are a different animal entirely, and confusing them with your standard liability policy is one of the most common and costly mistakes contractors make when pursuing public work.
Every year, Ontario contractors lose bids, forfeit deposits, or get disqualified from public projects because they didn't have the right bonding in place or they misunderstood what the owner was actually asking for. Municipal governments, school boards, hospitals, and Crown corporations all have specific public project bonding requirements in Ontario, and those requirements are non-negotiable once you're in the tender process.
This post will walk you through what surety bonds actually are, who needs them, what they cover, what they cost in Ontario, and how to put yourself in a stronger position before your next bid submission. No filler, just what you need to know.
What Is a Surety Bond and Why Is It Not Insurance?
A surety bond is a legally binding agreement between three parties: you (the contractor), the project owner, and the surety company. The surety company guarantees to the project owner that you will fulfill your contractual obligations. If you don't, the surety steps in to make things right, and then comes back to you for reimbursement.
That last part is where most contractors get tripped up. With a standard insurance policy, you pay premiums and the insurer absorbs the loss if a covered claim happens. With a surety bond, the surety is effectively vouching for your creditworthiness and your ability to perform. If they have to pay out, you owe them that money back. Think of it less like insurance and more like a line of credit with a guarantee attached.
This distinction matters enormously when you're filling out a prequalification package for a public tender. A certificate of insurance proves you carry liability coverage. A surety bond proves a third party has evaluated your business and is willing to stake a financial guarantee on your ability to finish the job. Owners and lenders treat these very differently, and for good reason.
Who Actually Needs Surety Bonds in Ontario?
Not every contractor needs bonding, but if you're pursuing public sector work or contracts above a certain dollar threshold, you almost certainly do. Here's who typically gets asked for them:
- General contractors bidding on municipal, provincial, or federal construction projects in Ontario.
- Subcontractors working on public infrastructure work where the general contractor requires downstream bonding.
- Mechanical, electrical, and civil contractors tendering on school board or hospital projects.
- Trades bidding on transit authority or Ministry of Transportation projects in Ontario.
- Contractors pursuing work under the Infrastructure Ontario Alternative Financing and Procurement model.
- Any contractor where the contract value exceeds $100,000 on a public project, though many owners set the threshold lower.
Private sector clients can also ask for bonding, particularly on large commercial builds or projects financed by institutional lenders. Banks and construction lenders in Canada increasingly require performance bonds as a condition of project financing, especially on projects over $5 million. If your client is borrowing to build, their lender may require bonding before the first draw is released.
Spring and summer are when bonding requests spike in Ontario, as municipal tendering activity picks up between April and June. If you're planning to bid on seasonal infrastructure work, get your bonding capacity in place well before the tender deadlines hit, not the week the bid is due.
What Does a Surety Bond Cover and What It Doesn't?
The coverage provided by a surety bond depends on which type of bond you're dealing with. There are three that Ontario contractors encounter most often:
- Bid Bond: Protects the project owner if you win the bid but then refuse to sign the contract or can't provide the required performance and payment bonds. Typically set at 10% of the bid price.
- Performance Bond: Guarantees the owner that you'll complete the project according to the contract terms. If you default, the surety either finances your completion, brings in another contractor, or pays damages up to the bond amount, usually 50% to 100% of the contract value.
- Labour and Material Payment Bond: Protects subcontractors and suppliers who haven't been paid. This is especially relevant in Ontario given the protections under the Construction Act, which governs holdbacks and lien rights on construction projects.
Here's what surety bonds do not cover:
- Third-party bodily injury or property damage claims on the job site. That's your commercial general liability policy's job, not the surety bond's.
- Your own equipment, tools, or materials. That falls under inland marine or contractor's equipment coverage.
- Disputes over contract interpretation, scope changes, or design errors. Bonding is not a substitute for proper contract management.
- Losses caused by the project owner's own negligence or breach of contract.
One real-world scenario that illustrates this clearly: a Hamilton-based civil contractor was bonded on a $2.3 million municipal road rehabilitation project. When they fell significantly behind schedule due to an internal cash flow problem, the municipality called on the performance bond. The surety paid out to bring in a replacement contractor to finish the work, and then pursued the original contractor for the full amount. The bond protected the city. It did not protect the contractor. That's the mechanism working exactly as designed.
Ontario and Canadian Context: What the Regulations Actually Say
Ontario's Construction Act (formerly the Construction Lien Act) is the primary legislation governing payment and lien rights on construction projects in the province. Under the Act, a labour and material payment bond can serve as a trust substitute, protecting subcontractors and suppliers from non-payment by the general contractor. Public owners awarding contracts over certain thresholds are required to comply with holdback obligations, and bonding is a standard tool used to manage that exposure.
Infrastructure Ontario sets its own bonding requirements for projects under its procurement programs. For projects using the Design-Build or Design-Build-Finance-Operate-Maintain model, surety requirements are typically embedded in the request for proposals and are non-negotiable. Contractors who have never gone through an IO procurement often underestimate how rigorous the prequalification process is.
At the federal level, Public Services and Procurement Canada (PSPC) requires bid bonds, performance bonds, and payment bonds on most federal construction contracts above a relatively low dollar threshold. The Canadian Construction Documents Committee (CCDC) publishes standard bond forms used widely across Canada, including CCDC 220 (Bid Bond) and CCDC 221 (Performance Bond), and most public owners in Ontario specify these forms by name in their tender documents.
It's also worth understanding how surety bonding interacts with your WSIB clearance certificate. Owners often request both, and a lapsed WSIB account can hold up your bond issuance. Keep both current if you're active in the tendering market.
What Does a Surety Bond Cost in Ontario?
The premium for a performance bond for contractors in Ontario typically runs between 0.5% and 2% of the contract value, though this varies considerably based on your financial profile and the project type. A bid bond premium is usually nominal, often a flat fee or a small percentage, because the exposure window is short.
Factors That Move Your Bond Premium Up or Down
- Financial strength of your business: Sureties underwrite your balance sheet, working capital, and profitability. Strong financials mean lower rates. Thin margins or high debt raise flags.
- Experience and track record: A contractor with 15 years of successfully completed public projects is a much easier underwrite than one pursuing their first municipal contract. Project history is reviewed closely.
- Size and complexity of the project: Larger contracts, longer timelines, and complex scopes carry more risk. Bonding on a $10 million transit project costs proportionally more than on a $500,000 road resurfacing contract.
- Aggregate bonding capacity requested: Sureties set a limit on how much bonded work they'll carry for a single contractor at any time. If you're asking to bond multiple large projects simultaneously, underwriting scrutiny increases.
- Bond term and contract duration: Longer projects keep the surety exposed for longer, which factors into pricing.
According to data from the Surety Association of Canada, bonded construction work in Canada represents tens of billions of dollars annually, and the claims rate, while low, has been trending upward as inflation and supply chain disruptions have stressed contractor cash flows since 2022. That environment has made some sureties more selective, particularly for contractors with less seasoned financials.
Every quote is different. Two contractors bidding on the same project can pay very different bond premiums based on their individual financial profiles. There's no published rate card.
How to Strengthen Your Bonding Position Before You Bid
Getting bondable is not just about having a clean credit score. Sureties look at the whole picture of your business, and there are concrete steps you can take to improve your position.
- Maintain current, professionally prepared financial statements. Most sureties want reviewed or audited year-end financials from a CPA. Working from internally prepared spreadsheets is often a dealbreaker at higher bond amounts.
- Keep your working capital healthy. Sureties use working capital (current assets minus current liabilities) as a primary indicator of your ability to sustain a project through cash flow gaps. Know your number before you approach a surety.
- Build a documented project history. Maintain a completed projects list with contract values, scopes, owners, and references. This is part of every prequalification submission and it matters.
- Don't wait until the bid deadline to apply for bonding. Surety underwriting takes time, particularly for new relationships. Start the conversation with your broker at least four to six weeks before you plan to submit a tender that requires bonding.
- Avoid overextending your backlog. Bidding on more work than your financial capacity can support is one of the fastest ways to lose bonding capacity or have a surety reduce your aggregate limit.
- Work with a broker who has surety relationships, not just a general commercial book. Surety markets in Canada are relationship-driven. The broker presenting your submission matters as much as the submission itself.
Common Questions About Contractor Surety Bonds in Ontario
Do I need a surety bond if I'm a subcontractor, not the general contractor on a public project?
It depends on the general contractor's requirements, not just the owner's. Many general contractors on bonded public projects in Ontario require their major subcontractors to provide their own performance and payment bonds. This is especially common on large ICI (industrial, commercial, institutional) projects and on Infrastructure Ontario work. If your subcontract value is significant, often above $250,000, ask the general contractor directly before you price the work. Getting bonded after the fact costs more and takes longer than planning for it upfront.
Can I use my liability insurance certificate instead of a surety bond when a public owner asks for one?
No, and this mix-up has cost Ontario contractors real money. A certificate of insurance and a surety bond serve completely different purposes. A certificate of insurance proves you have liability coverage for accidents and property damage. A surety bond is a financial guarantee that you'll perform under the contract. Public owners require both separately, and submitting one in place of the other will get your bid disqualified. If you're unsure what a tender document is asking for, call your broker before the submission deadline, not after.
How much bonding capacity do I actually need to bid on a $1 million Ontario public contract?
For a $1 million contract, you'd typically need a bid bond at 10% ($100,000) to submit the tender, and then a performance bond and a labour and material payment bond each at 50% of the contract value ($500,000 each) if you're awarded the work. That means your surety needs to be comfortable extending roughly $1.1 million in aggregate bond capacity for this single project. Your overall capacity limit, set by your surety based on your financial profile, needs to be high enough to absorb this alongside any other bonded work you already have in progress.
Next Steps
Surety bonds in Ontario are one of the more specialized areas of commercial insurance, and getting your bonding program set up correctly before you need it is what separates contractors who win public work from those who get disqualified on technical grounds. The time to sort this out is not the afternoon before a bid is due.
Boardwalk Insurance works with Ontario contractors to structure bonding programs that fit their financial profile and their target markets. If you're ready to get into public tendering or you want to increase your existing bonding capacity, visit our Surety Bonds for Ontario contractors page at myboardwalk.ca to get started, or reach out directly to speak with a broker who knows how surety markets in Canada actually work.
