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When the subfloor cant be removed (ie. if it would overly compromise the building) the best approach is to scribe small ’shim joists’ on top, and add another subfloor.  This can come at the cost of lost height, but occasionally is the only option.

Most often, the existing subfloor is removed, and the scribes are placed right on top of the existing joists, which are then re-braced, blocked, and sheathed with new subfloor.

Sometimes it is possible to remove the existing floor structure, and entirely replace it with new joists (either dimensional lumber or engineered lumber) with a new subfloor

If there are no mechanicals in the walls, and the walls could benefit from added structure, adding additional studs can be a good approach

When walls are structurally sound, but out of plumb or square, the most cost effective approach is to add profiles to the existing wall studs, to make the walls perfectly plumb and square.   

Where possible, the easiest and best approach is to remove the existing walls, and replace with new.  This is usually limited to interior partition walls