error1 posted:

Those valves are for my garden water spouts, I've got a pop-up lawn sprinkler that is now remote controllable

Detecting door open/close states is pretty easy and reliable with z-wave magnet sensors and a usb z-wave controller stick, but detecting locked/unlocked states is trickier.. I think the cheapest solution might be to modify the door frame so that you can stuff a microswitch inside the latch plate so that it gets pushed by the deadbolt when the door is locked.