adding on or not?
As to whether it's better to move or to add on, there are many factors to weigh. Cost is just one. Things like: do you plan to retire and live there "forever" or move on pretty soon? How much equity do you have in the current place? How are the taxes where you are, versus where you would be? Schools, shopping, proximity to work, relatives? How much other repair does the current place need to keep it together?
[This message has been edited by rpxlpx (edited February 21, 2001).]
Moving would involve selling your house. Keeping the house neat while raising kids, leaving for showings on 5 min warning, etc. I just moved and it cost me on the order of $12,000 in commissions and other fees. Can you afford to pay two mortgages? Otherwise you may have to move somewhere temporarily between selling the old and buying the new.