If you’re building a new site, and you already have Google traffic coming in, make sure your web designer takes SEO into account.
There are some really simple things you can do to make sure your website doesn’t lose traffic after relaunching. Here are some of them:
Keep URLs the same. Google looks at websites overall, but also individual pages. Google indexes your content based on its URL, so ideally when rebuilding you would keep your URLs the same to make it easy for them to understand.
Redirect any URLs that have changed. If you do change URLs, make sure you redirect the old ones to an appropriate place on the new website.
Keep some of the same content. Just like the tips above, keeping the same content helps Google to understand that it’s still your website, it just has a new design. Therefore it’s still relevant and they can probably trust it.