So – it is a year or two out from completing your book and you want to make it a hardcover too, or want to make some simple sounding change such as changing the price on the back cover. At this point the completed project has been archived on a backup drive.
Adding a second cover style or making other changes as part of a current project is not a big new time commitment – When a project has been finished and put to bed some time ago, it is a bit more work. This entails bringing that project back online, refreshing memory of the project and it’s pieces, and then making a new modified file(s) with the changes.
If the change is a change of price. That may require a new ISBN bar code for the new price.
If the new work is to create another page size or cover type, such as adding a hard cover, the new format needs a new ISBN. Both the new cover and the interior needs to be modified to reflect the correct ISBN for the format.
Work done to make changes to covers or inside after the project is completed will be billed at the current hourly rate with a minimum of one hour.