On May 14, 2020, the government announced that it was lifting limits on construction activities that can take place under the List of Essential Businesses established under the Emergency Order (O. Reg 82/20). This means that all construction activities or projects and related services that support construction activities or projects, including demolition services, can commence or restart as of May 19, 2020.
The amended regulation (O.Reg. 223/20) can be found here: https://www.ontario.ca/laws/regulation/r20223