Most subcontractors ask this question after they lose a job. Not because their price was wrong, but because they could not produce the right insurance certificate, limits, or wording in time.
If you work as a subcontractor in Ontario, insurance is usually not optional in practice. It is how general contractors and owners decide whether you can be on site, get paid, and stay in the bid list.
Commercial insurance in Ontario
What is a Certificate of Insurance and when is it needed?
Who this applies to
This guide is for subcontractors and trade contractors working in Ontario and across Canada, including:
Electrical, mechanical, plumbing, HVAC
Roofing, cladding, waterproofing, windows
Concrete, framing, drywall, flooring, finish work
Landscaping, snow removal, exterior maintenance
Restoration, abatement, demolition
Specialty trades and equipment installers
Subcontractors working on condos, institutional, retail, industrial, and municipal projects
The short answer
Yes, subcontractors usually need insurance.
Even if a project does not legally require it, most general contractors, property managers, and owners will. If you want to work for established builders in Ontario, you should expect insurance requirements in the contract and in the onboarding checklist.
Why subcontractors are asked for insurance
Insurance is not just about protecting you. It is about keeping the project stable.
GCs and owners use subcontractor insurance to:
• Reduce the chance a small incident becomes a large dispute
• Avoid paying your losses when your coverage is missing
• Keep their own insurance program cleaner at renewal
• Ensure there is a clear process when a third party is injured or property is damaged
• Confirm you can handle completed operations exposure after turnover
Key definitions that matter for subcontractors
Commercial general liability: Coverage that responds to third party bodily injury or property damage claims tied to your operations.
Completed operations: Liability coverage for injury or property damage that happens after your work is finished and handed over.
Additional insured: A party added to your liability policy by endorsement, often the general contractor or owner.
Waiver of subrogation: An agreement by your insurer not to pursue recovery against a specified party, often required in construction contracts.
Certificate of Insurance: Proof of coverage and limits. It summarizes the policy but does not change it.
Contractual liability: The part of liability coverage that can respond when you assume certain responsibilities in a contract, within policy terms.
What insurance subcontractors typically need in Ontario
The required mix depends on your trade and project type, but these are the common pieces.
1. Commercial general liability insurance
This is the baseline for most subcontractors.
What it typically covers:
• A customer, tenant, or worker is injured due to your work area
• You damage a client’s property while performing work
• A claim is made that your work caused property damage and you are sued
What it often does not cover:
• The cost to redo your own poor workmanship when there is no resulting damage
• Design, engineering, or specification errors unless you add professional coverage
• Damage to property you own, rent, or have in your care unless specifically addressed
2. Completed operations coverage
This is where many subcontractor claims get expensive, especially for building envelope, roofing, mechanical, and electrical work.
Common examples:
• A leak appears months later and damages multiple units
• A system fails after commissioning and damages equipment
• A defect allegation turns into a multi party lawsuit after occupancy
If you do work that can create a delayed loss, completed operations limits matter.
3. Tools and equipment coverage
If you own tools, ladders, specialized equipment, or mobile gear, you likely need coverage that follows it.
Common examples:
• Theft from a site or vehicle
• Damage during transit or storage
• Rental equipment you are responsible for
Many subcontractors assume the GC’s builder’s risk covers their tools. It usually does not.
4. Commercial auto or non owned auto
If you use vehicles for work, hauling, site visits, or deliveries, personal auto may not match your real use.
Common needs:
• Commercial auto for company owned vehicles
• Non owned auto if employees use personal vehicles for business tasks
• Hired auto if you rent or lease vehicles
5. Professional liability for design assist or advisory scope
If you do design assist, commissioning support, system specification, or provide advice that a client relies on, you may need professional liability insurance.
This is common for:
Controls and automation
Electrical design assist
Mechanical design build elements
Engineering adjacent services
6. Pollution or environmental coverage where relevant
Some trades need additional coverage because the work involves pollutants, dust, fumes, or environmental exposure.
Common examples:
Refrigerants and HVAC
Fuel tanks, lines, and remediation
Abatement and demolition
Certain restoration work
7. WSIB registration and compliance
Many Ontario projects require proof of WSIB status. This is often part of site access and onboarding, separate from the insurance certificate.
What is covered and not covered, with practical examples
Subcontractors run into gaps when the contract assumes coverage that the policy does not provide.
Covered scenarios you should plan for:
• Third party injury or property damage claims tied to your work
• Defence costs when you are named in a lawsuit
• Completed operations claims for resulting damage after turnover
Common uncovered or limited scenarios:
• Replacing your own defective work when it causes no damage beyond your work
• Contract penalties, liquidated damages, and pure delay costs
• Work outside the operations described on the policy
• Losses caused by gradual deterioration, maintenance issues, or known defects
Common claim scenarios for subcontractors
These are the claims that show up most often in Ontario projects:
• Water damage tied to envelope, roofing, plumbing, or HVAC
• Fire or smoke allegations tied to electrical work or hot work
• Trip and fall injuries tied to cords, debris, or temporary access
• Damage to existing property during renovations
• Equipment damage tied to power quality, improper installation, or commissioning issues
• Theft of tools and materials from sites, yards, and vehicles
• Disputes that become claims after a contract termination or back charge fight
Cost drivers and underwriting questions brokers actually ask
Underwriters do not price subcontractor insurance based on the name of your trade alone. They price it based on severity potential and controls.
Expect questions like:
• What exact work do you do, and what do you not do
• Your largest jobs and project types in the last 12 months
• Percentage of work that is residential, commercial, industrial, or institutional
• Work at heights, hot work, torch use, or roof access procedures
• Use of subcontractors under you and how you control their insurance
• Prior claims and the root cause of any losses
• QA processes, photo logs, checklists, commissioning documentation
• Geographic territory if you work outside Ontario or across Canada
How to reduce premium without reducing protection
The goal is stable pricing and fewer disputes, not bare minimum coverage that gets rejected by a GC.
Practical actions that lower risk and improve underwriting outcomes:
• Standardize your scope language and avoid taking on responsibilities you cannot insure
• Use job closeout checklists and photo logs for high severity work
• Keep a subcontractor insurance tracking process if you sub out any part of your scope
• Train and document hot work and fire watch procedures where applicable
• Maintain tool control and theft prevention, including serial number logs
• Align vehicle use and radius with your real operations
• Report incidents early with clear documentation to keep claims smaller
Mistakes that cause coverage gaps
These are the problems that get subcontractors removed from bid lists:
• Your certificate does not match the legal name on the contract
• Limits are below the tender requirement
• You cannot provide additional insured or waiver wording
• Your operations description excludes a key part of your work
• Completed operations is missing or too low for the project class
• You rely on a GC policy to cover your tools, materials, or equipment
• You start work before the certificate is approved, then a claim happens
Subcontractor insurance readiness checklist
Use this before you bid or mobilize.
• Confirm your legal business name matches invoices and contracts
• Confirm liability limit and completed operations meet typical owner requirements
• Confirm you can add additional insured and waiver endorsements when requested
• Confirm your operations description matches your real work
• Confirm tools and equipment coverage follows your gear off premises
• Confirm vehicle use is correctly insured, including non owned and hired auto if needed
• Confirm you can issue certificates quickly with correct certificate holder details
FAQ
Do I need insurance if I am a one person subcontractor?
Usually yes. GCs and owners still want liability coverage and completed operations. One person operations can still cause large losses.
Does the general contractor’s insurance cover me?
Not in the way most subcontractors assume. The GC may have project coverage for certain exposures, but you are usually expected to carry your own insurance and provide proof.
What limits do subcontractors need in Ontario?
It depends on trade and project type. Many projects set minimum liability limits and specify completed operations requirements. Higher risk trades and larger projects often require higher limits or an umbrella.
Do I need completed operations if I only do service work?
Often yes. Many service jobs still create exposure after you leave, especially mechanical, electrical, plumbing, and envelope related work.
What is the difference between tools coverage and builder’s risk?
Builder’s risk is typically for the project value and materials. Tools coverage is for your own tools and mobile equipment. They are not the same.
What if I work across Canada?
You need to confirm territory, travel, and contracts across provinces. Certificate and wording consistency becomes more important as you scale.
How fast can I get a certificate of insurance?
If your program is set up correctly and the request is clear, certificates can be issued quickly. Complex wording requests can take longer if endorsements are needed.
Talk to Boardwalk about subcontractor insurance in Ontario
If you are bidding work and keep getting held up on insurance requirements, we can help you structure a subcontractor insurance program that matches what Ontario GCs and owners actually ask for.
Request a Quote or Book a Meeting with us.
What we need from you to quote and structure this properly:
• Description of your work and what you do not do
• Your largest project value and typical job size
• Trade mix, percentage of work by project type, and geographic territory
• Any contract insurance requirements you are seeing on bids
• Vehicle list and how vehicles are used
• Tools, equipment, and any rental exposure
• Claims history for the last five years if available
