Before a project starts, the owner of the project has to determine whether designated substances are present at the site and put that list in front of every prospective contractor before they bid. That duty sits in section 30 of the Occupational Health and Safety Act, it applies to the project owner rather than the contractor, and it is the single most misunderstood obligation in Ontario construction. This page explains what triggers it, who carries the cost when it is skipped, and how it connects to the asbestos work classifications in O. Reg. 278/05.
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The trigger is the project, not the building's age
Contractors and property owners often assume the requirement keys off a build date, as though a 1985 building needs a survey and a 1995 building does not. That is not how the Act is written. The duty attaches to the project: before beginning construction work, the owner determines whether any designated substances are present, and prepares a list.
Age matters as evidence, not as a legal threshold. A pre-1990 Windsor building is far more likely to contain asbestos-containing material, so the determination usually ends in a survey. A 2005 building still requires the owner to make the determination; it just tends to be a much shorter exercise. The obligation to determine does not disappear because the answer is probably no.
This page describes what the legislation requires in general terms. It is not legal advice. Project-specific questions belong with your own counsel or the Ministry of Labour, Immigration, Training and Skills Development, which administers and enforces O. Reg. 278/05.
Eleven substances, not one
Asbestos gets the attention, but section 30 covers all eleven designated substances under Ontario law: acrylonitrile, arsenic, asbestos, benzene, coke oven emissions, ethylene oxide, isocyanates, lead, mercury, silica, and vinyl chloride. In a typical Windsor renovation or demolition the realistic candidates are asbestos, lead (paint and solder), silica (concrete, block, mortar), and mercury (thermostats, switches, fluorescent tubes).
This is why the deliverable is a designated substances survey rather than an asbestos report. A report covering asbestos alone does not discharge the section 30 duty, which is a distinction that surfaces late and expensively when a general contractor's health and safety reviewer reads the document and finds nine substances unaddressed.
Who pays when the list is missing
This is the part worth reading twice, because it inverts what most people assume about where the risk sits.
Under section 30, the owner includes the designated substances list in the tender documents. The constructor then ensures each prospective contractor and subcontractor receives a copy before they bid. If the owner does not comply, the owner is liable for the additional costs the constructor and contractors incur as a result.
The liability for a missing survey runs toward the owner, not away from them. A contractor who discovers unexpected asbestos mid-project has a statutory route to the resulting delay and remediation costs.
The practical consequence: a demolition that stops on day three because a crew opened a wall cavity full of friable pipe insulation is not a shared misfortune. The stand-down, the re-scope, the containment, and the schedule damage attach to the party who was supposed to produce the list. Commissioning a survey before tender is not a compliance nicety. It is the cheapest insurance available on the project, and it is normally a small fraction of one day of a stalled crew.
What the survey has to do to be useful at tender
A survey that satisfies the duty on paper but cannot be priced against is only half a document. For a Windsor project to actually bid cleanly, the report needs to give every bidder the same picture:
- Materials identified by location and quantity, not a general statement that asbestos is present somewhere in the building. Bidders price square footage and linear feet, not adjectives.
- Laboratory results, so the finding is a measurement rather than an opinion. Bulk samples go to an accredited lab; CALA accreditation is the standard reference point in Ontario.
- Condition of each material, because intact and damaged material lead to different work classifications and therefore different prices.
- The work classification the planned disturbance falls into, so the contractor knows before bidding whether they are pricing an afternoon of careful Type 1 work or a sealed Type 3 enclosure with negative air.
- Materials assumed rather than sampled, flagged explicitly. Inaccessible material is a legitimate finding. Silent omission is not.
Without the classification mapped to the planned scope, every bidder prices the worst case independently, and the owner pays for the ambiguity across every bid received.
Type 1, 2 and 3: where the money actually moves
Once material is identified, O. Reg. 278/05 sorts the planned work into three risk categories, and the category drives the cost far more than the presence of asbestos itself.
Type 1 is the lowest-disturbance work: small quantities, non-friable material, minimal fibre release expected. Ordinary care, wetting where practical, and area control.
Type 2 is moderate disturbance: larger quantities, more friable material, or methods like glove-bag removal on pipe insulation. Formal procedures, specific worker training, real containment discipline.
Type 3 is the highest-risk category: sprayed-on fireproofing or insulation, large quantities of friable material, or work where standard controls cannot reliably hold fibre release down. Full enclosure, negative air pressure, decontamination facilities, and, for the operations the regulation specifies, advance written notice to the Ministry of Labour before work begins.
The gap between a Type 1 afternoon and a Type 3 enclosure running for a week is not marginal. That gap is the entire argument for testing before tender rather than after mobilization.
Buildings you own and operate, not just projects you build
Section 30 covers projects. O. Reg. 278/05 also places ongoing duties on the owner of a building where asbestos-containing material is present, independent of any construction work: keep a record of the material and its location and condition, inspect it on a recurring basis, and make the record available to workers and contractors who might disturb it.
For Windsor property managers, landlords, school and institutional operators, that reframes the question. The relevant question is not "do we have a project coming up" but "do we have a current, accurate record of what is in these buildings and what condition it is in." A commercial asbestos survey built as a management document rather than a one-off project report is what that record looks like in practice.
Windsor specifics worth planning around
Windsor and Essex County's building stock is heavy on exactly the eras that produce findings. Much of the residential and light-commercial stock predates the late-1980s decline of asbestos in common building products, and the industrial and institutional inventory skews older still. In practice that means pipe insulation in mechanical rooms and crawlspaces, 9x9 floor tile with black mastic, joint compound in taped drywall assemblies, transite panel and siding, and vermiculite in older attic and block-cavity fills.
Two scheduling realities matter locally. Turnaround on laboratory results, not the site visit, sets the calendar; the sampling appointment is short and the lab queue is the variable. And demolition permits, tenant notice periods, and utility disconnections all run on their own clocks, so the survey wants to be commissioned when the project is being scoped, not when the crew is booked.
What we do and what we do not
We test and report. We collect samples, run them through an accredited laboratory, and produce the documentation a project needs at tender. We do not perform removal or abatement, and we do not bid on the remediation work that a finding might generate, which means the report has nothing riding on the result.
If you need air clearance testing after an abatement contractor finishes, that is a separate scope and we handle it the same way: sample, measure, report.
Common questions
Does a homeowner renovating their own house need a designated substances survey?
Section 30 attaches to the owner of a construction project, and OHSA governs workplaces and workers. A homeowner working alone with no hired workers sits outside that specific duty. The moment contractors with employees are engaged, the project analysis applies. The homeowner-facing explanation of O. Reg. 278/05 covers where that line falls.
Is an asbestos report enough, or does it have to cover all eleven substances?
The section 30 duty is a determination about designated substances generally. An asbestos-only report leaves the remaining ten unaddressed, which is why the tender-ready deliverable is a designated substances survey.
Who is responsible for getting the survey done, the owner or the contractor?
The owner of the project. The constructor's duty is to pass the list along to prospective contractors and subcontractors; producing it in the first place is the owner's.
What happens if asbestos is found after work has started?
Work that could disturb the material stops until the situation is assessed and the correct work classification and procedures are in place. Where the owner did not provide the required list, the additional costs that flow from that stoppage are the owner's responsibility under section 30.
Does the whole building have to be surveyed, or only the renovation area?
The determination covers the project site. A well-scoped survey covers the areas the work will touch plus any space where the work could disturb material outside the immediate footprint, such as shared mechanical chases and plenums.
Do Type 3 operations have to be reported to the Ministry?
O. Reg. 278/05 requires advance written notice to the Ministry of Labour for the Type 3 operations it specifies. The abatement contractor normally files it, but the requirement should be confirmed at planning rather than assumed.