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coal cellar into something more useful but don't think I've got the height to start with
Idk what your layout is, but what you can potentially do is dig down in the middle to give you extra head height - if that makes sense? Sort of like a channel.
Often you'll have wall storage or maybe a work bench, or tumble dryer, etc. so you don't need "real" standing height in those bits - just getting in/out and moving around to get to those bits.
It's very situational, but worth thinking about.
Is that mostly turning an existing cellar into a workshop or is there any foundations work being done? Have ambitions of turning my coal cellar into something more useful but don't think I've got the height to start with that you have there.