Information about your old site
Gather any data on sales, leads, or other performance of your old website so that you can compare it against the new site.
Track your old site?s search engine ranks.
Check what were the most visited pages on your old website.
Check how many other sites are linking to your old website.
New Site Launch
Keep as many of your old URLs as possible.
Make sure every URL from your old website would redirect to an appropriate page on your new website.
If page redirect is not feasible use a server-side 301 setting.
Run a link validator on your website to be sure that the internal links have all been updated.
Make ssure ?File Not Found? page is well written and explains the situation.
After Site Launch
Monitor 404 errors.
Make sure the inbound links link to existing URLs on your website.
Take the time to make sure your directory listings are linking to the correct URLs.
Submit XML Sitemap for getting pages indexed quickly.

Website Redesign Checklist

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