Met with builder today. Plan to replace thru attic metal chimney with a new masonry. New chimney would be built before new addition is constructed so as to make it an interior chimney with thru wall essentially same as for an exterior chimney. Builder says he can build chimney and thimble but not allowed to touch stove pipe. Says I should pull a permit to connect. As someone who routinely removes and brushes out stove pipe at least twice yearly, having to obtain a permit to connect seems a bit over the top. Wonder what inspector will require? Hopefully won't need to upgrade entire installation, like buying an epa stove or upgrading stove board which met code when installed but not up to current standards. Anybody been through this before?