"I-zheet M'drurz" wrote:

Do you REALLY think somebody will come in and guarantee the
workmanship of their installation using your existing wiring?

Had a similar situation where the builder did the prewire and we added an alarm
system about a year later. Found out too late that the wire to one window was
shorted ouit (nail, who knows?) and so one window will never trip.

By the way - there are good alarm systems that can be installed that do NOT
require any kind of subscription or contract. Find a company that is willing to
install one of those and do not get coerced into signing a multi-year contract.