A website should be evaluated across customer clarity, content, navigation, mobile use, forms, performance, search, software, ownership, and maintainability before a rebuild is treated as the answer.
Decide whether an aging website needs targeted repair, a partial redesign, or a full rebuild by checking structure, maintainability, ownership, and customer usability first.
The choice between repair, rebuild, and platform replacement should come from the root problem, ownership, maintainability, useful existing content, and migration risk rather than the age or appearance of the site alone.