Ontario's Asbestos Regulation, Explained for Homeowners

O. Reg. 278/05, made under the Occupational Health and Safety Act, is Ontario's asbestos rule, and it is written for employers and contractors, not directly for a homeowner working alone on their own house. The moment a contractor is hired, though, that contractor's obligations under the regulation become the homeowner's problem too, because they shape what the contractor can legally do, what they will insist on before starting, and what it will cost. This page explains what the regulation actually says, in plain language, and what it means in practice for a Windsor or Essex County homeowner.

Who the regulation applies to, and the gap that trips people up

O. Reg. 278/05 operates under the Occupational Health and Safety Act, which protects workers. A homeowner doing solo DIY work on their own owner-occupied house, with no workers involved, generally falls outside OHSA's reach the same way an employer-worker relationship does not exist. That is why you will sometimes hear "homeowners are exempt."

That exemption disappears the instant a contractor with employees is hired. The contractor is an employer under OHSA, their workers are covered, and the regulation's duties apply in full: identify asbestos before disturbing it, classify the work by risk, and follow the required procedures for that classification. A homeowner cannot waive these obligations on the contractor's behalf, and a contractor who skips them is exposing their own workers and their own business to real liability, which is exactly why a properly run contracting company will not start work on a pre-1990 home without asking about asbestos first.

The core requirement: identify before you disturb

The regulation's central idea is simple: before construction, renovation, maintenance, or demolition work that could disturb a designated substance, the material has to be identified. That is the entire purpose of a designated substances survey on a project of any size, and it is the same reason testing a specific material before a smaller job makes sense even where a full survey is not required. You cannot follow a work-classification rule for a material you have not confirmed is there.

Type 1, Type 2, and Type 3 work, in plain terms

Once asbestos-containing material is identified, the regulation sorts the planned work into three risk categories. This is the part of O. Reg. 278/05 that actually changes what happens on site, so it is worth understanding even as a homeowner watching a contractor work through it.

Type 1 operations cover the lowest-disturbance work: removing a small amount of asbestos-containing material without significantly disturbing it, such as taking down ceiling tiles that sit on top of, rather than bonded to, an asbestos-containing material, or minor repair to a small area of undamaged material. The precautions are correspondingly light: work carefully, wet the material where practical, and control the area.

Type 2 operations cover moderate disturbance: removing larger quantities of material, or removing material that is more friable, using methods designed to limit fibre release, such as a glove bag for pipe insulation. This category requires more formal controls, worker training specific to the procedure, and closer attention to containment than Type 1.

Type 3 operations cover the highest-risk work: removing sprayed-on fireproofing or insulation, removing large quantities of friable material, or any work where the standard controls cannot reliably keep fibre release low. This is where the regulation requires an enclosure, negative air pressure, and decontamination procedures, essentially treating the work area like a controlled containment zone until it is cleared.

A DSS report written properly maps the planned disturbance to one of these three categories, which is exactly why contractors ask for one before they will commit to a firm price: an unclassified job gets padded for the worst case, and a properly classified one gets priced for what it actually is.

What this means practically in Windsor

Windsor and Essex County's older housing stock, much of it built before the late-1980s phase-out of asbestos in common building products, means asbestos-containing materials show up routinely: pipe insulation, floor tile, joint compound, and vermiculite attic insulation among them, covered in more detail on the material identification page. None of that is an emergency on its own, a point covered fully on the is asbestos dangerous page. It becomes relevant the moment a renovation, repair, or demolition is about to touch those materials, because that is the point where identification and classification are required for any contractor doing the work.

Practically, that means:

• Before hiring a contractor for a pre-1990 reno or demo, ask whether asbestos testing has been done. A contractor who is not asking this question first is either already confident based on experience, which is a risk, or not thinking about it at all, which is a bigger one.
• A DIY project with no hired workers is not directly governed by OHSA the way a contracted job is, but the exposure risk to you and your household is identical either way. The regulation's line is about who is legally covered, not about where the actual health risk sits.
• A positive test does not automatically mean removal. As covered on the dangerous-or-not page, the regulation is built around disturbance, not simple presence. A positive result changes how work is done, not necessarily whether the material has to leave the house at all.

Where enforcement actually sits

The Ministry of Labour, Immigration, Training and Skills Development administers and enforces O. Reg. 278/05 under the Occupational Health and Safety Act. Enforcement is aimed at workplaces and constructors, meaning the practical exposure for a homeowner is indirect: a contractor operating outside the rules is taking on the Ministry's attention, not the homeowner directly, though a homeowner who knowingly directs unsafe work still carries real legal and health exposure of their own.

The regulation also shapes one situation homeowners rarely see coming: a purchase. If you are inside a condition period on a Windsor house and an inspector has flagged something, the timing of a test and what a positive result means for the deal is covered in buying a house with asbestos.

Common questions

Call (226) 773-8831 to get a material tested before a renovation or demolition project starts, so you and your contractor know exactly what category the work falls into before anyone picks up a tool.