How do I know if my roof needs repair or replacement?

To figure out if your roof needs repair or replacement, check its age—most last 20–30 years, per ThisOldHouse. Look at damage extent: minor, localized issues lean toward repair, but if over 25% is affected, replacement’s likely better. Compare costs—repairs over 50% of replacement cost suggest a new roof. Signs like sagging or frequent leaks scream replacement. Call a pro roofer for an inspection; they’ll spot hidden issues and guide you straight.