It is massive, but 35% would seem massive as well. So it's still impossible to interpret.

Okay but where is Koalamps.

Lol that and the choice of an oddly moderate percentage makes the statement impossible to interpret.

Yea I'll definitely chop up the parking pad, don't want cars directly in front of the window. I'll probably leave a narrow portion as a walkway from the new garage to the front door.

I'll definitely be getting permits and inspections. Went through that process when converting the bonus room and it wasn't as painful as I was expecting.

The HVAC question is something I'll definitely have to look into. I added ~250sqft when I finished my bonus room, and although the system has operated fine with the additional load, adding another 400sqft might put us outside it's abilities.

Our appliances are all electric so there are no combustion related vents.

Edit: However, I am seriously contemplating installing a zero clearance wood burning fireplace in the room. We have one in another room and I love it. That is a topic that will come with it's own set of wrinkles (chimney case framing, blower vents, outside air intake, etc). I've yet to make a decision on that but will delve deeper into it if/when I do.

How about we really break the bank and just print an entire black page on white paper.