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@BringMeMyFix
What some other people have said. If that was a stock size - say, a 54cm - you'd want at least a 56cm, and possibly a 58cm, depending on personal taste.
I'm happiest with bikes where the top tube and stem add up to 64-65cm, but prefer minimal spacers under my stem (I flex long steerer tubes), so prefer my bikes that are around 55+10, rather than roughly 53+12, as they'll have taller head tubes.
Smaller frames tend to have steeper seat tubes, so I'll 'gain' 1cm of virtual TT length in order to get a seat angle I'm comfortable with i.e. saddle is pushed back an extra 1cm.
Fucking hell that was convoluted and tedious - but the kind of stuff it's worth knowing before thinking about splashing out on custom builds, TBH.
EDIT: When shops measure you up, if they've got a surplus of small frames, but you're a medium (in an ideal world), unless you show some suss, they'll most likely sell you the small, and adjust with stem/seatpost. If you don't show any suss, it probably doesn't matter that much to you anyway, so who fucking cares.