partgypsy - I currently have no mortgage other than the $46k one that is at 0% interest, and I don't have to make any payments on (not until I refinance, rent out the house, or sell the house). So my current mortgage cost is $0/mo, and once I sell the house I will lose $46k in equity by paying off that $46k 0% "mortgage".
As for the sheds: Neither shed is on a slab. Code is supposed to require a slab, but we decided fuck that we are putting one up anyway. Then it got full and we decided we needed another shed just for bikes so we found another used one and put that up as well. We just laid down some bags of gravel and leveled it and put the sheds up. The bike shed is about 7X7 and full of bikes. The other shed is about 8X8 and full of gardening and lawn equipment, and also now is accumulating a lot of toys for my almost 3 year old.
I have a bike, my wife has a bike, we have a beach cruiser bike, we have another spare bike, my son has a little bike, he also has a pedal-less "balance" bike, we have a pull behind trailer, and we have 2 additional old non-operational bikes we are using for spare parts. We also have accessories like a bike pump, spare tubes, snap on child seat, and bike tools. This completely fills the 7x7 shed, and we have to lift the trailer up on store it on top of the bikes since it has such a huge footprint. The trailer technically folds up for easy storage, but that adds one more step required before you can ride it, so we just leave it together and set on top of the bikes. This requires my wife to remove my sons 2 bikes, then her bike, then pull the trailer down, and hook the trailer to her bike. Moderate PITA, but doable.
In the 8x8 shed we have all of our lawn and garden supplies, some patio furniture, etc. It's starting to fill up because my son is accumulating some toys. He's got the cozy coupe, a radio flyer trike, a motorcycle, a sit in and get pushed via handle car, his wheelbarrow, and probably several more I'm not thinking of at the moment. And he loves them all. It's cluttered, but manageable, but we can't store anything else outside.
None of the wires are underground, they are all in the air. But they go right across the yard where a garage would be, so we will have to have the utilities come out and reposition them to allow a shedgarage.