You do not, in fact, count those buildings towards your houses square footage. Doing so would open yourself up to all sorts of liability.
You don't count garage spaces as square footage of a house either, so what is your point? If he's comparing garage space footage to living quarter footage, then you should also include pole sheds into that equation. Fucking think about it... use the context of this conversation, and attempt to apply a little critical thinking.
All that aside, you’re slapping a 25’x52’ shed onto your 1/4 acre property? That’s almost 20% of your land use not including lot encroachment setback, drainage, and basic driveway/building infrastructure. It’s your property so definitely do as you wish, but to think this is a common practice or a desirable thing outside of niche hobbyists or being used for work related activities/storage is nonsense.
No, not adding a shed, extending my garage/shop. It has steel siding, nice windows, fully insulated 6 inch walls finished with osb on the inside, ceiling with tons of lighting, a ceiling mounted hot dawg furnace that takes it from 20F to 60F in literally 10 minutes, and perfect concrete with a drain.
Neighborhood flooding, no natural green spaces for habitats, it all sounds like a horrible dystopia on your mini-compound.
A lot of people use their garages for other things than just storing vehicles. Feel free to take a look at my YouTube videos to see how nice my garage/shop is setup now. And how nice my fenced in backyard looks, and how the garage doesn't take away from it, nor would adding the 20' onto the back of it. And how nicely this and my house all sit on this property. Then you can stop talking out of your ass, thanks buddy! Again, this OP has really been proving his point in a roundabout way, a lot of people in here like you talking out of their asses and getting upvotes.