Screens are most often found on windows or surround your pool area. They can be damaged by pets, things hitting them, whether, or just age. You should replace the screen when the tear is too big, the holes too numerous, or when the frame is damaged. If the frame is damaged, it’s best to replace the whole thing. Screens will stretch with time and the old mesh won’t fit correctly into your new frame.
Window screens take a lot of beating. Exposed to the weather, pet claws, and things striking them, they’re going to need repair or replacement at some point. When do you need to replace them, and when can they be repaired? Ask for a visit with no obligation.