Does an Ontario professional corporation need a separate certificate for each location it operates from?

This depends on your specific governing body's rules rather than a single province-wide answer. Some regulators authorize the professional corporation itself, without tying the certificate to a particular address, so operating from multiple locations doesn't necessarily require a separate certificate for each one. Others require additional filings, notices, or approvals tied to each location or branch where the regulated profession is practised through the corporation.

Because the certificate of authorization comes from the governing body rather than the corporate registry, this is a compliance question that sits outside your Business Corporations Act filings entirely. Don't assume that because your corporation is validly incorporated and in good standing at the corporate registry, it's automatically authorized to practise from every location you open. If you're expanding a professional practice to a second office, confirm directly with your governing body whether the existing certificate covers the new location or whether an update, notice, or additional application is required before you start operating there, so you're not caught practising from an unauthorized location.