It seems it would be best to hire an architect for your project. Your stated programming could be accomplished in maybe 500sf, so your 3,338sf addition and it's method, location, and what it does to the existing house layout would probably not even be in the right ballpark of schemes.

Your want a 1.5M addition? Why not just do a teardown and rebuild? Or add that to your home’s selling price and move to a bigger, better designed, house. This plan is a kooky joke. If you do not want to move, your second stop is an architect’s office. Your first stop is the bank.

It's a big project. Once you push the master back, you might consider moving that bedroom near the garage to the current master space, and possibly extend the kitchen.

Not a feasable project without a substantial budget, and some of that budget spent up front on a much better design concept. You are adding 2 full houses, to an already not tiny house.

I must be still sleeping what on earth do you hope to accomplish with that size addition? Maybe you misstated the size or I can't read the meaurements but IMO in order to get any help here you would need to post the entire floor plan with all measurements of the original house and then tell us what you want form this enormous addition.

Recheck your calculation. The area you highlighted is about 1350 sf.

Regardless, by doing that all of the rooms that used to be on exterior walls will now have no windows. The bigger issue is that roofs don't just magically expand - you might need an entire new roof to do this. And the addition would be the size of a small house, so expect it to cost what a small custom home would cost in your area. If you have that kind of money to spend on an addition and you want to move forward regardless, you need an architect. With just a basic floorplan outline as you have posted, no one here can help.

anj_p is right about everything. Your math is off, the interior spaces will have no windows, and the roof will likely be impossible. It looks like a terrible idea, but it might be worth talking to a local architect to get more insight.

I agree with all of you! It was an unrealistic idea and I apologize for wasting your time! My husband told me it was ridiculous as well, but I was curious to get some feedback. I appreciate you all for telling me the truth and what I needed to hear. Thank you all!