If only part of your roof needs to be replaced, you can do a partial roof replacement. But this will lead to an uneven life span on your roof and more work in the long run.
Getting a roof replacement can be a stressful experience, even if it’s only half of the roof. But when you only replace half of it at a time, you’re setting yourself up for double the work over the lifetime of owning your home as you try to keep up with repairs and replacements.