Security comes in layers. Doors and window frames should be hardened, and window panes can have 3M film applied so they can't be easily shattered. You can also put a deadbolt on the door to the reptile room.
Surveillance cameras are good but mainly for nailing the perps after the fact. Make sure that footage is saved off-site.
Alarms can be a deterrent as well but they can be pricey and some PD's charge if they have to respond to false alarms.
Some gun stores have "burglar bombs" installed where they emit CS gas if tripped, but if you do this you'll need it between the entry point and the reptile room. People get the heck out of dodge quickly when those go off. They would also need to be set so that any other pets you have, such as dogs and cats, wouldn't set them off.