You really need to talk with a real estate attorney and talk with the insurance company. Every state has it's own laws regarding home warranties. You should have ask the alarm company questions before you had them install their system. Most or allot of alarm systems today are wireless and do not require drilling into anything. But this is after the fact now. However, I am not an attorney, but in many states home builders are on the warranties for up to 10 years. Many home owners do not know this fact. Read your home warranty and see if it says anything about drilling the exterior finish of the home voids the warranty. Hope this helps.