After my old prefab garage with up-and-over door was broken into a couple of years ago, and all my bikes were nicked, I went with the following –
New timber build shed (i built it myself, more like a chalet than shed…), two 5 lever deadlocks on door, triple security hinges, as hinge pins were exposed I also fitted hinge bolts which engage into frame when the door shuts, door edge trimmed in steel which overlaps frame and eliminates pry/crow bar access, windows are 6mm toughened and only 50cm square between uprights so no chance of getting a bike out, stand alone alarm in there with pin keypad, also wireless PIR linked to house alarm with twin bellboxes, when all those go off its bloody noisy!, all windows have blinds to stop snooping, I’ve set up one of our old babymonitors in there, other end lives on my bedside cabinet, bikes anchored to steel racking in shed (doesnt fit through door). Ive also go another custom security touch, but i’ll keep that one to myself!
Once bitten, twice shy they say
No repeated break in attempt yet, still wondering when they’ll come back…..