Do You Need a Professional to do Roof Maintenance?
As with many things that require maintenance, the need for a pro depends heavily on what type of work needs to be done. For some things, such as snow removal, there is no need for a pro as long as you're physically able to do the job and you can follow simple instructions. Other issues, such as spotting emerging problems or fixing leaks, typically require professional assistance.
Roof inspections, on the other hand, should always be done by professionals. Even though you'll likely remember what a roof problem looks like once you've seen it, there will be plenty of other possible problems that you won't recognize. Plus, professional roof inspections often reveal problems before they're big enough to be obvious to you.
Once problems are discovered by inspectors, they will recommend professional roof maintenance as a matter of course. For most people, it's a good idea to take this recommendation just to avoid having to go up on the roof. If your roof has a steep pitch, it's an even better idea to let someone else go up there. A professional crew has the training and experience to reduce the chance of mishaps, and insurance that will kick in if any mishaps occur anyway.
It's also a good idea to have professionals do roof inspections and repairs if there is anything challenging about your roof setup. Solar panels, satellite dishes, and other such attachments complicate roofs and make it so that "standard" repairs aren't as standard as they could be. A company that is used to dealing with these things has the best chance of getting everything right on the first try. They can also spot and fix any problems with the attachment of the items in question.