Hello, may I ask your advice please. Builder left opening in chimney for just a fireplace (height to lintel will be only 30 inches from finished floor level). However, I had hoped to put in a large/tall stove as a feature point and now realise that opening is too small i.e. flue position is too low - it would only suit a very very small stove and my room is a large open plan one. Advice I got was to approach builder and ask him to kangoo out a hole above the lintel at a height that could take a taller stove. Is this advisable or would this be structurally detrimental for the chimney? It would mean though, I assume, that I would need to have picked the actual stove and know exact measurements before starting to cut out a hole. I have already asked him about lifting the current lintel up to facilitate a bigger stove but he said that was a massive job and near impossible and structurally not advisable, however, before house goes any further, I want to explore whatever other options there are to rectify the situation (just at first fix stage at moment; no internal insulation/drylining done yet) before throwing in the towel so to speak! Thanks very much.