Do I need redirects when rebuilding my website?

Yes, when an existing URL changes and the old page has traffic, links, search visibility, bookmarks, or a closely matching replacement on the new site. Send each old URL directly to the most relevant new destination with a permanent 301 redirect. Do not send every removed page to the homepage or make visitors pass through several redirects. Build and test the redirect list before launch so visitors and search engines reach the right content. Google's redirect guidance explains when permanent redirects are appropriate.