We have a 1936 5 room house with a 100 amp service w/ circut breakers.
We wil be updating to 200amps service soom. Down the road it
probability 2 rooms add to the house 1 of witch will a bedroom the
other will be a family room (computer). My big question is what to
look at having to done in line of the fuse box or electric work


thanks
jim

Assuming you do not want to do work inside the panel, on your own, or
that doing so is a code violation - I don't know if this is up to code
but while the electrician is in there I'd have him add enough circuits
to handle the future expansion. Either run one big circuit to a branch
box at the end of the house where the new addition will be, or run some
circuits to junction boxes whereever is convenient. Then you can tap
into the junction box without having to get into the new panel.

Basically have the pro do all the work inside the new panel but run
circuit(s) which would be left 'off' for future growth.