Google SEO for new website.?

[Julian]

I've re-built my website, how can I get google to re-list it so it matches the new website and not the old one?

[Jake]

If you changed the domain name, you effectively have to start from scratch, using 301 redirects from the old name could transfer some backlink juice.

If the structure was radically changed on the unchanged domain name, submitting a site map to Google Webmaster Tools would be important, again it's possible to setup 301 redirects, perhaps a list in the .htaccess file to redirect links to the old URLs to their new counterparts.

[Raelynn Hannah]

After Jake's answer there's nothing more to tell. Submit it to Google Webmaster Tools and submit sitemap.xml also make sure there's no issue with robots.txt