You’re buying a house with home security devices
A new house may come with an existing security system. All the devices function well, are placed in the right places, and are ready to go. In this case, just get the phone to call and start a new contract. A Vivint expert will still come out to make sure there are no usability problems, and they might offer suggestions on upgrades. It's a preliminary appointment, and you can get your alarm monitoring set up without having a bill for any new components -- unless you make additions.
The outgoing homeowners can move an existing Vivint contract to your family for a nominal transfer fee to make your life simpler. If the outgoing residents downsize to an apartment complex or smaller home, turning over the security service may be a condition of the sale.
You need to move and take your existing equipment with you
You might need to take your old Vivint system with you to a new house when you move. Luckily, it's fairly easy to accomplish, as many components are plug and play. You can remove each device yourself or call a professional expert to come and take care of everything. Then a pro will hang the same components -- and any smart services you want to add -- in the new place. And your home security contract will keep the same.