Increasing the size of the fireplace opening

18 Nov 2020
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United Kingdom
Afternoon all,

I'm looking for some advice on how to increase the side of my fireplace. However looking up my chimney the stack takes a 45 ish angle towards the right.

How would I go about raising the height of my fireplace opening? As I see it I'd be able to raise the front of the fireplace with a new lintel installed higher up however the rear corbel bricks would still be there preventing the creation of a square fireplace opening.

Any advice on how to raise the height of the fireplace opening creating a rectangular opening for a future stove?

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