Ontario’s Occupational Health and Safety Act and related regulations may require a designated substance survey before certain construction, renovation, and demolition projects begin. These requirements focus on protecting workers who may be exposed to regulated substances, which means they become particularly relevant when a homeowner hires a contractor.
Even when a homeowner plans to complete a project independently, it’s still important to identify potentially hazardous materials before disturbing walls, ceilings, floors, insulation, or other components in an older home.
Inch By Inch Inspections has been conducting designated substance surveys and asbestos removal in Toronto since 2006. Our reports are supported by certified inspectors and our membership with the Environmental Abatement Council of Ontario. Here’s what may determine whether your residential project needs a survey.
What a Designated Substance Survey Actually Checks For
A designated substance survey assesses the project area for substances regulated under Ontario’s Occupational Health and Safety Act. These substances include:
- Acrylonitrile
- Arsenic
- Asbestos
- Benzene
- Coke oven emissions
- Ethylene oxide
- Isocyanates
- Lead
- Mercury
- Silica
- Vinyl chloride
Not all of these substances are commonly found in residential properties. However, asbestos, lead, mercury, and silica may be relevant depending on the property’s age, materials, and planned work.
The survey may involve a visual inspection, review of the project scope, sample collection, and laboratory analysis. The findings are documented in a designated substance report that identifies the substances found, their locations, and considerations for the planned work.
Why the Law Focuses on Protecting Workers
Ontario’s occupational health and safety requirements place responsibilities on employers and constructors to protect workers from known or suspected hazards. When contractors or other workers are hired for a residential renovation, the substances they may encounter need to be identified and communicated before work begins.
This is why a project inside a private home can still trigger occupational health and safety responsibilities. The building may be residential, but it becomes a workplace while contractors and their employees perform the renovation.
When a Residential Project May Need a Survey
A designated substance survey may be needed when a residential renovation or demolition involves contractors disturbing materials that could contain regulated substances. This is particularly important in older homes or buildings where the composition of the materials hasn’t been confirmed.
Relevant projects may include:
- Kitchen and bathroom demolition
- Basement renovations
- Removing drywall, plaster, flooring, or ceilings
- Disturbing insulation, pipe wrap, or duct materials
- Electrical or plumbing work that requires opening walls
- Structural renovations and additions
- Partial or complete building demolition
The project’s scope, the age and history of the property, the materials being disturbed, and who will perform the work all affect whether a survey is required.
What Can Happen If a Required Survey Is Skipped?
Skipping a required survey can expose workers and occupants to hazardous materials. It may also lead to work stoppages, project delays, additional testing, and unplanned remediation if a suspected substance is discovered after demolition begins.
On residential projects, a common problem is discovering asbestos partway through a renovation. Work then needs to stop while testing, containment, and asbestos removal in Toronto are arranged. Addressing the issue under an urgent timeline can be more disruptive and expensive than completing the survey before work starts.
What to Expect From a Residential Survey
A residential designated substance report in Toronto typically begins with a review of the planned renovation area. An inspector assesses the materials that may be affected and collects samples where laboratory confirmation is needed.
The final report gives homeowners and contractors information about:
- The designated substances identified in the project area
- The locations and conditions of affected materials
- Laboratory results for collected samples
- Materials that require precautions before disturbance
- Considerations for removal, management, or further assessment
This gives everyone involved a clearer picture of the hazards that need to be addressed before demolition or construction begins.
Planning a Renovation? Get a Designated Substance Survey in Toronto
A designated substance survey turns uncertainty about older building materials into a documented plan before renovation or demolition starts. Completing the survey early can help protect workers and occupants while reducing the likelihood of avoidable delays.
Inch By Inch Inspections has been conducting designated substance surveys and asbestos-related work throughout Toronto and the GTA since 2006. Our certified inspectors and EACO membership support every report we prepare. If you’re planning a residential project and aren’t sure whether it requires a survey, we can help you determine the appropriate next step before work begins.
