... is long
At least one more bathroom, preferably two.
A bigger and infinitely more practical kitchen.
A back hall big enough to handle a family of five and our coats, mittens, bags, shoes, etc. and those things that get piled up to be taken out to the garage or car.
A practical and pleasant laundry area.
Much more light flowing through the house.
One more home office and one larger than the existing one.
A closer connection between the back yard and the living space.
Turn part of the basement into living space.
Energy efficiency and a more pleasant indoor climate, both winter and summer.
Last, but not least, we want to make it feel like OUR house.
Of course, all of this needs to be done on shoestring budget...