I don't think my wife would allow bikes in the house (I have gotten away with it on rare occasions while I am working on it or something). My "garage" is currently minus a door and half a wall till we can get it rebuilt, so that isn't a secure option.

Our good bikes are locked in a shed we built in the backyard (a plastic Keter one). Our 4 good bikes take up more then half of it, plus bike gear/etc take up part of the rest of the space. I think I can squeeze one more bike in there This will eventually go away when we get the garage rebuilt (or that is the plan).

Our beater bikes are hidden in the secrete back-back yard, behind a fence with a hidden door. Sadly no structure, only a tarp to help keep them dry.

I have considered building/buying a small bike storage shed, but haven't found something with the right dimension yet.

I also have one bike that is stored elsewhere.