If you are looking to change the scope of the contract after the tendering process has been completed, please see negotiations. This article covers changes to a particular bid submission - not changes to the contract itself.
Although ContractComplete makes every effort to prevent mistakes, upon reviewing bidders' submissions you may notice that one has made a mistake or has accidentally omitted something. Or alternatively, they may have forgotten to submit their bid. Or perhaps you wish to get a last minute quote from a contractor who wasn't part of the original bidding process. All of these scenarios can be addressed through the "Bid Resubmission" feature.
To summarize, after a tender closes, any bid can be changed (or submitted for the first time) if you, as a stakeholder, explicitly request it. This is done on the contract overview page in the bidder list. It gives the bidder one-time authority to change their bid then re-submit. The bidder will be notified by email when you make this request, and you, as as stakeholder will receive an email notification after this process is complete.
Cut your bid review and change order processing from hours to minutes.