quote:
Another question for you, would it be cheaper to add another level or exend the living space into back yard and redo everything
That's a question that definitely has to be answered by someone familiar with city codes and zoning. First it should be determined what's possible and legal, No sense estimating costs for something you won't be permitted to do.
To be able to answer your question accurately, an architect would have to sketch out very basic designs for each option, after determining their legality, and then do a rough statement of probable cost for each. An answer off the top of someone's head won't be very accurate.
You should be able to work out a fee arrangement with an architect which will enable you to bail out inexpensively after the initial stage of his work.
In general, building above an existing structure saves foundation costs, but is very labor-intensive and therefore more costly. Building on the ground is cheaper, but you have to build a foundation. It really all depends on how much space you need, and how much space is possible with each alternative. Maybe your space requirements will dictate one way or the other.
Speaking of space requirements, a written program of kinds of spaces and square footage of each should be arrived at before any architect puts as much as a single line on paper, or on his computer screen, as the case may be.
Architect (NY) and Home Designer (PA)