The Building Code and WorkSafeBC require that we investigate for asbestos before having workers onsite. This applies for homes built before 1990. Previously, we relied on cutting access holes to see what is behind the drywall to reduce surprises. Because we are now unable to do this until after testing, the decision to move ahead with planning and design is either made with less information or the asbestos survey needs to be done right at front end.
The WorkSafeBC website has a brochure entitled "Safe Work Practices for Handling Asbestos."