Please give suggestions

One of my cleint have static html website and he now wants to change the website from static to dynamic in html so i want to ask if we do that will seo get affected in any way and if yes what the are measures should we take to avoid?

Do give your suggestions as cleint has already spend 3-4 years on seo of the website and he really don't want any isues with the seo of the website.

Thank you

Yes, it would affect your website SEO slightly but as long as you would keep the same URL structure and content then it would be fine.

If the urls are changed in extensions then do a 301 redirect and you will be fine after 1-2 weeks.

First and foremost, you should be sure that your primary content is in HTML. Google's robots have some problems converting content into JavaScript.

what the other members said is correct.

You need to recreate the site (both the content and the URL structures) and then 301 each URL to the new one. And yeah, your rankings will probably go down for a while but if everything is done right they should come back