ECA Ottawa recommends to its members that when submitting your bid to a general contractor or the school board, you provide your hourly rate for Contemplated Change Orders on the bid form. This would also apply to any job where there may be a conflict with hourly rates. Understand that your bid submission is your contract at the time of tender. If there is no stipulated pricing or language in your submission for changes then you may have an issue. Your submission is your legal contract until a CCDC or other contractual document is presented to you for your review and acceptance. They accept your bid, they have accepted your terms and conditions.
This Change Order Guide link will allow you to view and download the cost of a manhour of electrical labour for pricing Change orders or additional work orders on fixed price contacts. It is effective as of May 1, 2018.