You’re buying a place with security devices
A new home may come with an existing security system. All the devices work, are placed in the correct areas, and are ready to go. In this case, just pick up the phone to call and start a new contract. A Vivint expert will still show up to ensure there are no compatibility issues, and they may offer suggestions on upgrades. It's a quick appointment, and you can have your alarm monitoring set up without paying for any new alarms and cameras -- unless you add on.
The old homeowners can give an existing Vivint contract to you for a nominal set-up fee to make your life easier. If the previous owners are downsizing to an apartment complex or retirement community, transferring the security service might be a part of the sale.
You are looking to move and take your home security components with you
You might need to take your favorite home security components with you to your new place when you move. Luckily, it's fairly simple to transfer, as many smart devices are plug and play. You can uninstall each device by yourself or call a professional installer to take down everything. Then an expert will hang the same components -- and any smart services you need to add -- in your new house. The home security contract will stay the same.