Looking for some practical advice from people who've converted small garages into workshops.

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Photos attached. Apologies for the mess - it's gradually become the family dumping ground over the last couple of years, which is one of the reasons I'm trying to sort it out.

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The garage is attached to the house and is roughly 2.1m wide, 5m long and 2.45m high. It's a dry garage with a flat roof, concrete floor and single-skin brick wall on the outside. I've been here two years and haven't seen any signs of damp or water ingress.

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The aim is a workshop with bike storage, a small exercise area and somewhere I can occasionally work from home when the house is chaos (two children under six and not much spare room).

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I'm already replacing the garage door with an insulated Hormann roller door, so hopefully that will deal with a lot of the draughts.

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My biggest constraint is space. At only 2.1m wide, I don't want to lose loads of width chasing perfect insulation values.

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If this was your garage, what would you do?

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How would you insulate the roof?

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How would you insulate the wall?

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Would you bother with the floor?

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Most importantly, what would the actual build-up be? As in:

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Brick wall → ? → ? → board

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Roof → ? → ? → ceiling

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I've watched quite a few workshop conversion videos from Ali Dymock and Strawbyte, which have been helpful, but I'm still not clear on the best approach for a garage this small.

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I'm not looking for Building Regs perfection. I just want the biggest improvement in comfort for the least loss of space, and ideally an idiot's guide to how you'd actually build it.

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Interested to hear what people would do if this was their own workshop.

How would you insulate this tiny garage workshop without losing loads of space?