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Construction & Trades
Insurance for what's under the bucket, beside the trench and on the float.
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An excavation contractor in Canada needs commercial general liability that covers underground utility strikes, collapse and damage to neighbouring property, with completed operations and no restrictive depth exclusion. Add a contractors' equipment floater for owned, leased and rented machines, commercial auto for trucks and trailers, contractors' pollution liability for fuel and soil, and workers' compensation. In Ontario, construction businesses must have WSIB coverage.
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Excavation claims are rarely small. A struck gas service, a cut fibre line, a neighbour's cracked foundation or a machine rolled into a cut can each produce the largest claim a site work contractor sees in years. We build programs around that reality: general liability without depth or underground exclusions that remove your real work, completed operations for settlement after backfill, and contractors' pollution for fuel, hydraulics and soil.
Your machines need cover that follows them, so we schedule owned, leased and rented equipment on a contractors' equipment floater with rental reimbursement. We document your locate practice under Ontario's One Call Act, issue certificates GCs ask for, and keep WSIB clearance in order. See the wider construction and contractors guide for the sector view.
Most trades damage what they can see. An excavator damages what it can't. A bucket that catches a gas service, a fibre trunk or a water main can cause an evacuation, a fire, an outage for thousands of customers and a repair bill from a utility that expects to be paid. The same machine can undermine a neighbour's foundation, collapse a trench on a worker or tip into an open cut.
That is why insurers treat excavation as a heavy class. They ask about depth, locate practice, the share of work near utilities, and who operates the equipment. Excavation sits inside the wider construction and contractors sector, and this page covers what is specific to digging, grading, trenching and site preparation.
A typical excavation program has six parts. The liability policy carries the largest exposure. The equipment floater protects the machines that earn the revenue.
| Coverage | What it answers | Points to check |
|---|---|---|
| Commercial general liability (CGL) | Utility strikes, damage to adjacent buildings, injury to the public, completed-operations claims after backfill | No underground resources or depth exclusion that removes your real work, completed operations included, limit that meets your contracts |
| Contractors' equipment floater | Theft, fire, upset, collapse and damage to excavators, skid steers, loaders and attachments | Owned, leased and rented machines, replacement cost or actual cash value, rental reimbursement while a machine is down; see tools and equipment |
| Commercial auto | Dump trucks, pickups and float trailers on the road | Trailer and attached equipment, drivers' records, haul radius; see commercial auto |
| Contractors' pollution liability | Hydraulic and diesel spills, disturbed contaminated soil, sediment runoff | Sudden and gradual events, transport and disposal sites, soil you haul away |
| Umbrella or excess liability | Contract limits above your CGL and auto, or a severe strike | Follows form over CGL, auto and employer's liability |
| Workers' compensation and employer's liability | Trench collapse, struck-by and rollover injuries to your crew | Mandatory provincial coverage first, employer's liability for gaps |
In Ontario, locates are governed by the Ontario Underground Infrastructure Notification System Act, 2012. It continues Ontario One Call as the corporation that runs the call system, and makes owners and operators of underground infrastructure, including gas distributors, electricity distributors, Hydro One and municipalities, members of it. The Act sets the rules every excavator should build its procedures and its insurance file around.
| Rule | What the Act says | Why it matters for your insurance |
|---|---|---|
| No digging without locates | An excavator must not start until it has submitted a locate request, every member that may be affected has marked its infrastructure or stated in writing it is not affected, and the markings match the written information (s. 10(1)) | A strike with no valid locate is the hardest claim to defend and the most likely to be disputed |
| Request timing | A standard request must not be made more than 30 days before the dig is expected to start (s. 12(1)) | Request too early and you may be digging on stale information |
| Utility response time | A member must respond to a standard request within five business days, unless a different time applies (s. 6(3)) | Plan schedules around it, and record late responses |
| Locate validity | A locate is valid for 60 days or another prescribed period, and is deemed expired once the ground markings are no longer visible (s. 8) | Keep digging after expiry and you are outside the Act; request again |
| Manner of digging | An excavator must not dig in a way it knows or ought to know would damage underground infrastructure (s. 13) | Hand-exposing or hydrovac work inside the tolerance zone is your evidence of care |
| Who pays | An excavator who breaches s. 12(1) or s. 13 must compensate the member for its loss; a member that gave an inaccurate or late locate must compensate the excavator, including delay costs; unresolved claims go to the Ontario Land Tribunal (ss. 16, 17) | Your CGL defends you against the utility; your locate records support a claim back |
| Offences | A person who contravenes the Act or its regulations can be fined up to $10,000 on conviction (s. 18) | Fines are generally not insurable; the procedure is your protection |
Ontario's Construction Projects regulation adds a workplace safety duty: before an excavation begins, the employer excavating must ensure that gas, electrical and other services in and near the area are located and marked, and hazardous services must be shut off or, if they cannot be, the owner asked to supervise uncovering them (O. Reg. 213/91, s. 228). Other provinces run their own one-call services and rules. We confirm them for each province you work in.
The scenarios below are hypothetical, but they reflect the losses underwriters ask about on every excavation application.
| Hypothetical scenario | Allegation | Policy that responds |
|---|---|---|
| Operator strikes a marked gas service while trenching for a water line | The utility claims repair costs and the cost of the response | CGL, with the defence built on the locate sheet, photos and tolerance-zone practice |
| Fibre cable is cut where the locate showed nothing | The carrier claims repair and lost revenue | CGL defends; a recovery against the member for an inaccurate locate may follow under s. 17 |
| Basement dig for an addition undermines the neighbour's footing | Cracked foundation and walls next door | CGL, unless a subsidence or underground exclusion applies; check before you start |
| Excavator tips into the cut overnight after heavy rain | Machine damaged beyond repair | Contractors' equipment floater |
| Ruptured hydraulic line leaks into a ditch that drains to a creek | Clean-up costs and a regulator order | Contractors' pollution liability; most CGL forms exclude it |
| Driveway sinks over a service trench a year after backfill | Poor compaction caused the settlement | CGL completed operations for the damage; redoing your own work is usually excluded |
Ontario's Construction Projects regulation sets the baseline for excavation safety. Walls of an excavation must be supported by a support system unless an exception applies, such as an excavation less than 1.2 metres deep, one no worker is required to enter, one cut in sound rock, or one sloped to the gradient the regulation sets for the soil type (s. 234). A level area at least one metre wide must be kept clear of equipment, spoil and materials at the top of each wall, and no machine may be placed where it affects wall stability (s. 233). Where an excavation may affect the stability of an adjacent building, the constructor must take precautions specified in writing by an engineer (s. 229).
There is a notice duty too. A project that includes a trench into which a person may enter, more than 1.2 metres deep and over 30 metres long, or more than 300 metres long, triggers a notice of project. Smaller projects with a trench deeper than 1.2 metres that a worker may enter still require notice to the nearest Ministry office before work begins (ss. 6, 7).
Injury to your own crew in a collapse is a workers' compensation matter. Damage to a neighbour's building, a road or a utility from a wall failure is a CGL claim, and insurers will ask whether an engineer specified the protection. Some CGL policies exclude subsidence or limit work below a set depth, so we match the wording to the depth you actually dig.
Your machines are your revenue. A commercial property policy covers contents at a named location. It won't follow an excavator to a site, onto a float or into a ditch. A contractors' equipment floater does, and CCDC 41 expects all-risks coverage on construction equipment with no subrogation against the owner.
In Ontario, heavy equipment operator (dozer, excavator and tractor loader backhoe) are prescribed trades under the Building Opportunities in the Skilled Trades Act, 2021, but they are not compulsory trades. Mobile and tower crane operator trades are compulsory. Insurers still ask about operator training and experience, and good records help your rate.
Standard CGL forms largely exclude pollution. For an excavator that means a burst hydraulic hose, a fuel spill from a refuelling tank or disturbed contaminated fill may not be covered unless you add contractors' pollution liability. CCDC 41 asks for $5,000,000 per occurrence of contractors' pollution liability on contracts that use it.
Soil leaving the site carries its own risk. Ontario's On-Site and Excess Soil Management regulation (O. Reg. 406/19) defines excess soil as soil or rock excavated as part of a project and removed from the project area, and requires the project leader for certain project areas to file a notice in a public registry before that soil is removed. If you haul and place soil for clients, make sure your pollution policy covers transport and the sites where soil ends up, and that your contract makes clear who is responsible for testing and destination.
General contractors and owners decide whether you get on site, and the insurance clause is part of that decision. Many use CCDC contracts, whose insurance schedule, CCDC 41 (2020), sets general liability at $10,000,000 per occurrence for the contractor. Subcontract terms vary, so read the insurance section of every tender.
Public and larger private work often needs bonding as well. Our contract surety page explains how sureties qualify site work contractors. Our post on why every contract asks for a certificate covers additional insured and notice wording.
In Ontario, the WSIB says people who own or run a construction business must have coverage, with or without employees, including independent operators, sole proprietors and some partners and executive officers. A principal that hires a contractor for construction work must obtain a clearance certificate before work begins, and can be held liable for the contractor's unpaid premiums, up to the labour value of the contract, if it doesn't. A clearance is valid for up to 90 days.
Owner-operators who rent themselves and a machine to GCs are caught by those rules, and a GC will not let you start without a clearance. Outside Ontario, check with your provincial workers' compensation board. Our post WSIB is not enough explains why employer's liability still matters.
Excavation CGL is usually rated on payroll or revenue in an excavation class, with subcontracted work rated separately. The underwriter then adjusts for the details of your operation:
Pollution and umbrella limits add their own premium, so we price the limit your contracts require alongside the one you might prefer, and show both. A quote starts with your revenue split by type of work and your equipment list.
Related trades: see our pages for demolition, concrete and landscaper insurance.
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This page is general information, not insurance or legal advice. Coverage depends on your policy wording and the insurer. Speak with a licensed broker about your situation.
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