When I last had an alarm installed I said it was on condition they gave me the engineer code. Otherwise you are hostage to silly charges for getting back up batteries replaced etc. and there's a good chance they will have died/gone bust.
The last house I bought had an alarm and the seller had lost the code, at some point it had started going off, and he had cut every wire in sight and stuffed the bell box with old towels. Thanks a bunch! I settled for leaving the box on the wall as a deterrent which worked without any trouble for 20 years :)
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Disconnecting a house alarm new
Disconnecting a house alarm new