Designated Substances & Hazmat Surveys in London, ON
Designated Substances & Hazmat Surveys works the same way across Ontario on paper — but in London, who enforces it, how fast trades can attend, and what buildings typically need all have a local shape.
Before construction or demolition, project owners in Ontario are legally required to determine whether designated substances are present and share that list with every bidder — and equivalent hazardous-materials assessment duties exist across Canada through occupational health law. The survey that answers it covers the classic set at once: asbestos, lead, mercury, silica, PCBs, ozone-depleting refrigerants and mould.
How it works in Ontario
Ontario frames this under the Ontario Building Code (O. Reg. 332/12). In practice, the standards your documentation must meet come from the municipal building department — and meeting them first time is exactly what our partners are for.
Designated Substances & Hazmat Surveys for London properties
What makes London specific: the Residential Rental Units Licence has required licensing of smaller rental buildings since 2011 — one of Ontario’s longest-running rental licensing regimes — with fire and building inspections tied to renewal.
Most London requests reach us from one of four directions: a transaction, an insurer condition, a municipal letter, or a board meeting where someone finally asked when this was last done.
Why it is the owner’s problem
The duty sits on the project owner, not the contractor: fail to disclose, and you own both the liability for exposed workers and the change orders when materials surface mid-project. Contractors bidding without a survey either price in fat contingency or stop work when they hit suspect materials — a survey up front is cheaper than either.
The process
The path from enquiry to closed file usually looks like this:
- Send project scope and building age; drawings help but are not required.
- The consultant surveys and samples across all designated substances.
- You receive the tender-ready report.
- Abatement, where needed, is bid and executed with monitoring.
- Clearance documentation releases the site to construction.
Send us the details and we will come back with the applicable requirements, a realistic timeline for London, and a firm path to a closed file.
Frequently asked questions
How is this different from an asbestos survey?
Scope: a DSS covers the full designated list, not just asbestos. Renovating a 1975 office, you want the ballasts, thermostats and paint answered in the same report.
What do surveys cost?
Small commercial interiors run roughly $1,500–$4,000 including labs; full buildings scale with size and sampling density. It is routinely the cheapest line in a construction budget relative to risk retired.
Which authority handles this in London?
Day to day, enforcement in London runs through the municipal officials (building, fire prevention, by-law) with the municipal building department as the provincial authority behind them under the Ontario Building Code (O. Reg. 332/12). Our local partners deal with both routinely.
Related in London
Designated Substances & Hazmat Surveys elsewhere in Ontario
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