I'm gonna look at this realistically, well, as realistic as you can be when it comes to zombies.
I'm sorry but this does not look secure at all. Why have an Xbox when you can have security cameras watching all of the blind spots around your base? There are too many windows that are big enough for a human to slide through if they can break in. The door looks weak and is too obvious, seriously, at least make it out of metal and double up so if something makes it through the first one you'll have a back up. The guns on the roof will be pretty useless once anything gets within a certain distance of the house, unless those guns can bend over that railing on the roof.
The rooms are too cramped, if something does breach the house there won't be anywhere to run if you get swarmed. And what is the point of the barbed wire? It wouldn't really hurt zombies and any humans that would try attacking would probably bring something to cut it or to throw over it. Also, the open ladder up top is either asking for a zombie to crawl in or someone to get a lucky grenade down it and then a good chunk of your house would be missing.