Construction Site Insurance Requirements in Ontario: What Contractors Need to Know
Business Insurance
Published by BrokerUnion Insurance Editorial Team | RIBO-Licensed Ontario Insurance Broker | October 28, 2026
Reviewed by Muqit Aziz, Principal Broker
There's no single insurance package that Ontario law requires on every construction site. Construction site insurance requirements in Ontario come from four places: legislation (such as WSIB coverage and auto insurance), your construction contract, the project owner or lender, and the actual risks of the project. Most contractors need commercial general liability (CGL) at the limits their contracts specify, many projects need builders risk insurance, and nearly everyone working in construction needs WSIB coverage, which is separate from both.
This guide separates what's legally required from what's contractually required, explains each type of coverage, and shows how to prepare for a construction insurance quote.
About the author: BrokerUnion is an independent, RIBO-licensed Ontario brokerage. Our commercial insurance products are placed through RIBO-licensed brokers, and our business insurance offering includes coverage for contractors and construction businesses.
Four kinds of construction insurance requirements
When someone says a project "requires" insurance, it's worth asking who requires it:
- Legally required: imposed by Ontario legislation, such as WSIB coverage for construction, auto insurance on vehicles, and surety bonds on certain public contracts.
- Contractually required: set by the construction contract, often including CGL limits, additional insured status, certificates of insurance and builders risk.
- Owner or lender required: conditions a project owner or construction lender attaches to funding or site access.
- Recommended based on risk: coverage that isn't required by anyone but protects your business, such as tools and equipment, pollution liability or higher liability limits.
A broker's first question is usually "can I see the contract?" because that document often defines most of what you need.
What insurance is legally required for construction in Ontario?
WSIB coverage
WSIB isn't commercial insurance, but it's the most important legal requirement in construction. WSIB coverage is mandatory for independent operators, sole proprietors, partners in a partnership and executive officers in a corporation who work in construction, with some exemptions, such as one eligible partner or executive officer who does no construction work, and certain home renovation work.
WSIB covers workers' workplace injuries. It does not cover injuries to the public, damage to someone else's property, or damage to the project, which is what CGL and builders risk are for.
WSIB clearance certificates
If you hire a contractor to do construction work, WSIB policy requires you to obtain a clearance confirming the contractor is in good standing before work begins and keep it current. Hiring a contractor without a valid clearance can leave you responsible for their unpaid premiums.
Auto insurance on business vehicles
Every vehicle used on Ontario roads, including pickups, dump trucks and service vans, must carry at least $200,000 in third-party liability. Business vehicles need coverage that reflects business use.
Surety bonds on public contracts
Under the Construction Act, contractors on public contracts of $500,000 or more must provide a labour and material payment bond and a performance bond, each generally for at least 50% of the contract price. A public contract is one where the owner is the Crown, a municipality or a broader public sector organization. Bonds are a guarantee, not insurance (see below).
Professional liability for some designers
Ontario's Building Code requires certain registered designers who prepare designs for building permit applications to carry professional liability insurance, and architects and engineers have their own professional requirements. Design-build contractors should check whether these rules apply.
Is CGL legally required?
There's no general Ontario law requiring every contractor to carry CGL. In practice, almost every construction contract, general contractor and municipality requires it, so most contractors can't work without it.
Construction insurance coverage types
Not every contractor needs every coverage below. Which apply depends on your trade, your role on the project and the contract.
| Coverage | Main purpose | Typical construction use |
|---|---|---|
| Commercial general liability (CGL) | Third-party bodily injury and property damage | Contractor operations on and off site |
| Builders risk (course of construction) | Covered construction property | The building or project under construction |
| Tools and equipment | Contractor tools and equipment | Theft or covered damage |
| Commercial auto | Business vehicles | Transporting crews, tools and materials |
| Business interruption | Lost income and extra expense | After a covered loss stops operations |
| Pollution liability | Pollution and environmental exposures | Excavation, demolition, abatement and similar work |
| Professional liability (E&O) | Professional or design errors | Design-build and design-related services |
Commercial general liability (CGL)
CGL generally covers claims by third parties for bodily injury or property damage arising from your covered operations, subject to policy terms and exclusions. Examples include a passer-by hurt by falling debris, or a neighbour's property damaged during excavation. It often includes completed operations coverage for claims that arise after the work is finished. Our guide to commercial insurance for Ontario small businesses explains CGL in more detail.
How much CGL insurance does a contractor need?
There's no universal minimum. Limits are usually set by contracts, general contractors and municipalities, and larger or higher-risk projects usually require higher limits. Read your contract; it usually states the exact limit.
Builders risk (course of construction) insurance
Builders risk, also called course of construction insurance, protects covered property while it's being built or renovated: the structure, materials on site and often materials in transit or stored off site, subject to the policy. It typically responds to covered perils such as fire, theft, vandalism and certain weather damage. Coverage, exclusions and deductibles vary by insurer, and some policies exclude or limit theft, water damage or testing.
Tools and equipment coverage
Contractor's equipment coverage (often called an equipment floater) covers tools and mobile equipment against theft and covered damage, on site, in vehicles or in storage. It's usually separate from CGL and builders risk, and isn't automatic.
Commercial auto
Pickups, vans, dump trucks and other vehicles used for the business need commercial auto coverage that reflects business use.
Business interruption
If a covered loss shuts down your operations, business interruption coverage can replace lost income and pay extra expenses, subject to policy terms. It usually attaches to a commercial property policy.
Contractor pollution liability
Standard CGL policies often exclude or heavily limit pollution. Contractors handling excavation, demolition, asbestos or mould abatement, fuel tanks or contaminated soil may need contractor pollution liability.
Professional liability (E&O)
If you provide design, engineering, project management or design-build services, CGL may not cover claims arising from professional errors. Professional liability fills that gap.
Builders risk vs CGL: what's the difference?
| CGL | Builders risk | |
|---|---|---|
| Protects | You, against third-party claims | The project property itself |
| Example | A neighbour's car is damaged by falling materials | A fire destroys the framed building and stored materials |
| Duration | Usually annual | Usually for the project term |
| Typically bought by | Each contractor | Owner or general contractor, as the contract assigns |
Does CGL cover damage to the building being constructed?
Generally not. CGL is designed for third-party claims, and it typically excludes damage to your own work or the property you're working on. That's the gap builders risk is designed to fill, subject to policy terms.
Does a construction site need builders risk insurance?
Not by law. But builders risk is often required by the construction contract, the project owner or the construction lender, and it's strongly recommended on most new builds and significant renovations because the project itself is usually the largest uninsured exposure. The contract normally says who must buy it, whether the owner or the general contractor, and who must be named on it.
Who pays for builders risk insurance?
Whoever the contract assigns. On many projects the owner arranges it; on others the general contractor does. The cost may be built into the contract price.
What insurance does a general contractor need?
A general contractor usually carries the broadest program because it controls the site and manages subcontractors. Depending on the project and contract, that may include:
- CGL at the limits the owner requires, with completed operations
- builders risk, if the contract assigns it to the general contractor
- tools and equipment coverage
- commercial auto for company vehicles
- WSIB coverage and clearance certificates
- pollution or professional liability where the work calls for it
- surety bonds on public or bonded projects
General contractors also manage subcontractor risk by requiring proof of insurance and WSIB clearances before subcontractors start.
What insurance does a subcontractor need?
Subcontractors generally need their own CGL, WSIB coverage and the coverages their trade requires, such as tools and equipment or commercial auto. The subcontract usually specifies limits and whether the general contractor and owner must be named as additional insureds. A subcontractor can't rely on the general contractor's policy to protect its own business.
Can a contractor work without insurance in Ontario?
A contractor may not be legally barred from working without CGL, but most clients, general contractors and municipalities won't allow it, and the contractor would be personally exposed to claims. Working in construction without required WSIB coverage, on the other hand, can be an offence.
What is a certificate of insurance?
A certificate of insurance (COI) is a document from your broker or insurer that summarizes your coverage: the insurer, policy numbers, coverage types, limits and dates. Project owners and general contractors ask for COIs to confirm you're insured before you start. A COI is evidence of insurance; the policy wording is what actually governs coverage.
What does additional insured mean?
Additional insured status extends some of your liability policy's protection to another party, usually the owner or general contractor, for claims arising from your work. Contracts often require it. Adding an additional insured requires an endorsement on your policy, not just a mention on the certificate, so ask your broker to arrange it and confirm the wording matches the contract.
Common contract insurance requirements
| Requirement | Who may request it | Why it matters |
|---|---|---|
| Certificate of insurance | Owners, general contractors, municipalities | Proves coverage before site access |
| CGL limits | Owners, general contractors | Ensures enough liability protection for the project |
| Additional insured | Owners, general contractors | Extends your liability coverage to them for your work |
| Builders risk | Owners, lenders | Protects the project property during construction |
| WSIB clearance or compliance | Anyone retaining a construction contractor | Required by WSIB policy before work begins |
| Commercial auto | Owners, general contractors | Confirms vehicles on site are insured |
| Bonding or surety | Public owners, some private owners | Guarantees performance and payment |
| Project-specific coverage | Owners, lenders, large projects | Provides dedicated limits for one project |
Wrap-up liability insurance
A wrap-up policy is a project-specific liability policy that covers the owner, general contractor and subcontractors under one program for a single project. It's common on larger projects and can reduce gaps and disputes between multiple contractors' policies. If a project has a wrap-up, contractors should still check what their own policies need to cover outside it.
Surety bonds are not insurance
A surety bond is a three-party guarantee. The surety guarantees to the project owner that the contractor will perform the contract (performance bond) or pay subcontractors and suppliers (labour and material payment bond). If the surety pays, the contractor is expected to reimburse it. Bonds protect the owner and others, not the contractor, which is why they're underwritten on the contractor's financial strength and experience, not just risk.
How much does construction insurance cost in Ontario?
There's no reliable average, because construction insurance is underwritten project by project and contractor by contractor. A small renovation contractor's annual CGL and a builders risk policy on a multi-storey build are priced on completely different bases. The factors insurers commonly weigh include:
| Factor | Why it matters |
|---|---|
| Project value and construction budget | Sets builders risk limits and overall exposure |
| Construction type | Wood frame, concrete and steel carry different fire and damage risks |
| Project duration | Longer projects mean longer exposure |
| Location | Urban density, site access and local weather |
| Contractor experience | Track record in similar projects |
| Annual revenue and payroll | Often used to rate CGL |
| Subcontractor use | How much work is subcontracted, and whether subs carry their own insurance |
| Type of work | Trades such as roofing, demolition and excavation carry higher risk |
| Claims history | Past claims affect price and eligibility |
| Liability limits and deductibles | Higher limits cost more; higher deductibles cost less |
| Site security | Fencing, lighting, cameras and guards reduce theft and vandalism risk |
| Hot work | Welding, torching and roofing torches raise fire risk |
| Excavation and demolition | Higher risk of property damage and injury |
How much does builders risk insurance cost?
It depends mainly on the project value, construction type, duration, location, site security and deductible. A broker can quote it once the project details are known.
Construction insurance quote checklist
- Legal business name and address
- Type of construction and your trade
- Project address
- Project value and construction budget
- Project start and end dates
- General contractor or subcontractor status
- Scope of work
- Number of employees and estimated payroll
- Annual revenue
- Subcontractor details and how much work is subcontracted
- Prior claims
- Existing insurance policies
- Contract insurance requirements
- Required liability limits
- Additional insured requirements
- Builders risk requirements
- Any hot work, excavation, roofing or demolition
Whenever possible, give your broker the actual contract or its insurance section, not a summary. Requirements such as specific endorsements, waiver of subrogation, notice of cancellation or primary and non-contributory wording are easy to miss when paraphrased, and an incorrect certificate can delay site access or create gaps.
Common construction insurance mistakes
- Buying only CGL. CGL doesn't cover the project itself, your tools or your vehicles.
- Assuming builders risk is automatically included. It usually isn't part of a contractor's annual policy.
- Not checking contract requirements before signing or starting.
- Failing to add an additional insured by endorsement when the contract requires it.
- Not disclosing subcontractors or the work they do.
- Underinsuring the project value on builders risk.
- Not updating the broker when scope changes, such as adding demolition or extending the schedule.
- Assuming tools and equipment are automatically covered.
- Ignoring pollution or design exposures that CGL may exclude.
- Letting coverage lapse during a project, including at renewal.
Contractors should also disclose higher-risk operations, such as hot work, excavation, roofing and demolition, when applying. Undisclosed operations are a common source of claim disputes.
How BrokerUnion helps with construction insurance
BrokerUnion is an independent, RIBO-licensed brokerage, and no insurer owns it. For construction clients, our commercial brokers:
- review your operations, contracts and project-specific requirements
- identify gaps between your existing business policy and a new project
- recommend coverage and limits that fit your trade and role
- compare options from commercial markets and specialty MGAs, with availability depending on product, risk, location and underwriting criteria (see the insurance companies we work with)
- issue certificates of insurance and arrange additional insured endorsements
- support renewals, mid-term changes and claims
We can't guarantee that every project requirement can be met by every insurer, but we can tell you early what's achievable and where specialty or project-specific markets may be needed. BrokerUnion's compensation and conflict disclosures are published on our mandatory disclosures page.
Frequently asked questions
What insurance is required for a construction site in Ontario?
It depends on the project. WSIB coverage is legally required for most people working in construction, vehicles need auto insurance, and public contracts of $500,000 or more require surety bonds. CGL, builders risk and other coverages are usually required by contract, the owner or the lender.
Is construction insurance mandatory in Ontario?
There's no single construction insurance policy required by law on every site. WSIB, auto insurance and public-contract bonds are legal requirements; most other coverage is contractual or recommended.
Is WSIB mandatory for construction workers?
Yes, with limited exemptions. WSIB coverage is mandatory for independent operators, sole proprietors, partners and executive officers who work in construction, as well as employees.
Do construction sites need liability insurance?
Not under a general Ontario law, but almost every construction contract requires CGL, and working without it leaves your business exposed to third-party claims.
What is course of construction insurance?
Another name for builders risk insurance: coverage for the project property during construction or renovation.
Does builders risk cover theft, fire and vandalism?
Typically fire and vandalism are covered, and theft often is, subject to conditions such as site security requirements. Coverage varies by insurer, so check the policy wording.
Does construction insurance cover tools?
Not automatically. Tools and equipment usually need separate contractor's equipment coverage.
Do construction contracts require proof of insurance?
Usually, yes, in the form of a certificate of insurance, often with additional insured endorsements and specific limits.
What happens if a construction site has no insurance?
The owner and contractors would bear the full cost of any injury claim, property damage or loss to the project themselves, and contractors could be in breach of their contracts. Missing WSIB coverage can also lead to penalties.
How do I get construction insurance in Ontario?
Gather your business, project and contract details from the checklist above, then speak with a commercial insurance broker who can compare markets that write your type of work.
Get a construction insurance quote
Planning a construction project in Ontario? Speak with a licensed BrokerUnion commercial insurance broker to review your contract requirements and explore available construction insurance options.
- Get a construction insurance quote: request a quote
- Speak with a broker: (905) 492-7070 about your construction project
- Learn more: BrokerUnion business insurance, all insurance coverage and our insurance resources
Construction site insurance requirements are set by law, contract and risk together. Reading the contract carefully and closing the gaps before work starts is the most reliable way to stay protected.
About BrokerUnion
BrokerUnion Insurance Inc. is an independent, RIBO-licensed insurance brokerage headquartered in Pickering, Ontario, with offices in Pickering, Barrie, Mississauga, Whitby, Sudbury and Kitchener. This guide was written by the BrokerUnion Insurance Editorial Team and reviewed by Muqit Aziz, Principal Broker, using WSIB and Government of Ontario sources.
Construction insurance requirements vary by project, contract, business activities, insurer underwriting and applicable Ontario laws and regulations. This article is general information and is not a substitute for reviewing your specific contract, policy wording or advice from a licensed insurance professional.