Please take note that you only switching hosting services within same country. You are switching hosting service that is located in other country. Switching hosting to other country will affect your site’s SEO. No domain or permalink changes should take place too. Any changes to your domain or URL structure should followed by permanent 301 redirection. Assuming that you are only going to switch hosting service to another provider that is located in the same country, you are not going to see any changes in SEO point of view.
Q: We are a pretty big site. We are changing our hosting company in the next few weeks (same country). Should we be scared from an SEO perspective?
Answer: “Probably not”. Noticed that you’re saying you’re changing the hosting company. So, your domain name is totally same. I’m assuming what you mean that your IP address is going to change. And, that’s no problem at all. Especially, you’ve mentioned that within the same country. So, I would expect no effect whatsoever. I’ve done this with bunch of different times where I switch hosting companies; there hasn’t been any kind of problem. Typically, what you want to do if you are moving to a new IP address, is set your DNS Time To Live (TTL) to be very low like 5 minutes because sometimes if that DNS is cached for a day, then they’ll look up what your IP address and then that’ll be cached for 24 hours and then it will go to your old IP address. So, if you set your DNS time to live very short like 5 minutes, and then you can bring up the website on both locations. Switch the DNS to point from the old to the new, and then within 5 minutes or so, you should see everybody clear their cache and start to visit this new page. As soon as Google bot is visiting the new pages, then you know we’ve seen the DNS change to new IP address and then you should be in pretty good shape. Even for the people that mistakenly cached DNS for 24 hours and there are some browsers or places around the web that do that, usually 24 hours is enough for that migrate. So, if you can set your time to live (TTL) to be a little short; great, but if not, just keep your site live on both locations, both IP addresses for 24 hours and you should be in great shape. Most people can switch their IP address and never have any issue or whatsoever, so I wouldn’t worry about SEO perspective.