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Thanks, there will never be a car in there, so no issues there.
I can't really build up from the current level more than a little bit, there would be a step up in floor level from exterior to interior. Suppose it could ramp down to the door , but likely stats getting tricky to do.
I wonder if there is any way to cut out some of the bigger bulges there currently, most of the variance in height is limited to some small bulging higher areas
chrismanc-
In that case get a grinder and do bits at a time.
I'd try and make some sort of rough level out of a long bit of scrap wood to make sure you don't miss any.
Idk if this would work at all, but I wonder if you got a floor sander and the lowest grit possible and take off the top layer and smaller imperfections before selfleveling and adding the final finish - paint, epoxy, etc.
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Hire a floor scabbler (a large machine that grinds concrete surfaces) they're loud, dusty and vibrate like hell but they can be used as a plane to level floors, you will need to re-finish the top with sharp sand and cement or a dedicated mortar repair product.
hugo7
Bobbo
Most levelling compounds won't do 30mm in a single application and will probably be expensive for a whole garage. I guess you could lay a new layer of concrete on top with some kind of additive to avoid it being too brittle to get it closer to level and then finish off with levelling compound?
Not sure if they're suitable for taking the weight of a car etc.