Yes this is regularly done for clients is relatively straight forward.
Removing chimney breast ground floor only.
Rsj would have a span of 3750mm from internal load bearing wall 220mm thick approx to rear external wall also 220 approx.
Note that removing any portion of a chimney breast will require structural reinforcements for that floor and the one above as well as possible reinforcement of the outer wall.
One of the most common internal alterations carried out is to remove an obsolete chimney breast at ground floor to create more floor space.
Building regulations apply to this work because it is a material alteration to the structure ensuring the remaining.
No only does this mean it is actually not as disruptive as you might have thought but it also avoids the need to alter the roof or external appearance and character of the building.
Homeowners rarely go to the cost of scaffold to remove the chimney above the roof or may not be able to if it is shared with a neighbour.
We would need to explore the flooring above the chimney to expose the joist giving access to calculate the dimensions of re enforced steel joist to sit within the ceiling floor void therefore removing the bulk head or inner beam visible within the ground floor space.
Chimney breast exists on 1st floor but chimney top has been removed previously.
Quite often the chimney is also removed at first floor level leaving just the roof void and external section of the chimney in place.
Want to remove the chimney breast on the party wall from the ground floor only.