Partial stone chimney breast removal

TamsinC

HI there, hope this is the right place to post. We are in the process of buying a house (and we love it). It is old and has been 3 properties now knocked into one. One of the issues is that where two of the properties have been knocked together the corridor into them is very narrow due to a disused capped chimney breast, the chimney stack has been properly removed from the roof. Trouble is this chimney breast is stone and about 6ft wide and 3 ft deep. We would like to widen the corridors which would mean taking about a foot to 18 inches off the width of the chimney breasts. Is this doable? Or would the whole lot need to come down? At the moment the chimney breast is boxed in so removing it all wouldn't be an issue, but it removing only some of it was easier all well and good too. I'm assuming costs will be quite a lot and around £2.5K?