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then you'd need to factor in the opening up and new lintel if going into existing fabric... do you have an architect?
Yep had thought I'd need to open up a bigger space - no architect involved yet, am trying to work out how feasible this is before we start spending money. If this is a non-starter for cost / practicality reasons then I prob don't need an architect for what we're planning so would save that cost.
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what about a short door with a bench/plinth beneath? similar use opportunity but not identical to - https://www.lyncharchitects.com/projects/hatton-place/
The reference photo looks to be in the UK (maybe, could be) - google image search its origin and contact the architect/owner? I've done it before and been surprised at the response/success rate
A glazier can give you a sqm glass cost based on requirements/location - they should also be able to ballpark frames and labour, then you'd need to factor in the opening up and new lintel if going into existing fabric... do you have an architect?