New Website upload without loosing the SE rankings

Four simple things that can help you maintain the Search Engine rankins as you upload a renovated website in place of an existing one can be listed as follows:
1. Point the new site to the current IP being used
2. Upload the new site over the old site
3. Create a new google xml. site map
4. Also, if you have analytics you can check setup HTTP redirects to your 10-15 most visited pages.