Google has said this before but it is always comforting hearing them say this multiple ways.

Google’s Zineb Ait Bahajji said in a Google Webmaster Help thread that if done correctly, there will be “no negative impact on the website’s visibility in the long term.”

She said this is in Google’s documentation:

“Settle down over time” doesn’t necessarily mean “no negative impact” but since Zineb is making that 100% clear now, it is good to share with you all.

Google: “if the site move is done correctly, it will have no negative impact on the website’s visibility in the long term.”

How can you do it correctly? Well, Google has a very detailed document and walk through on their help section.

Forum discussion at Google Webmaster Help.