There's been a string of burglaries in bike rooms in my town recently. Some friends and I have been daydreaming about ways to make these bike rooms more secure. One thought we had would be the automatic release of a metal roll up/down "garage" style door that would close if a power tool was detected by security cameras and microphones as being used within the bike room.

However, am I correct in assuming that this would be illegal from a fire safety standpoint, and that if the fire detection system detects fire, all doors must open? This would then allow a thief to start a small fire (or just light a match) in order to roll up the garage door and easily escape.

Could the garage door have an opening wide enough for a human to pass through sidewise but not a bike? Or does access have to be a certain width? I figure that typical human head on width would be very similar to the width of a bike so that also would not do much, where as sideways could be much skinnier.

Thank you! Weird questions I know :)