We just downsized houses so we can grow our family while the Wife stays home with the kids. We were in a single family 4 bedroom house that had an unfinished basement plus a garage. Now we're in a townhouse with a fully finished basement and no garage. Still 4 bedrooms but no storage space at all besides a few random closets here and there. It's tough but I'm finding space in the utility room even though the ceiling is only 66 inches high... I get half of the 4th bedroom to which I have shelving for and I"m stashing stuff where ever I can fit it. I also have a full size fridge for my taps, a floorstand corker with all the bottles to age my twice a year big brew day and all the other equipment to store. Immersion chiller, grain mill, buckets, bulk grain, scale, hoses, kettles, mash tun, burner, extra fermentors both 2.5 gallon and 5 gallon, etc, etc...
I'm def going to have to buy a shed of some sort to keep outside but I still have our bikes, lawnmower, and other crap to store too. I'm also into smoking meats so I have a propane weber grill, a charcoal grill, a smoker, fire pit, etc, to also to put into a shed. So, there's not a whole lot of room for my brew stuff but I'm trying to make it work... I figure people brew in smaller spaces so I should be able to make this work.
We just bought the house and I'm already looking forward to selling it in 3-5 years....