this is definetely a project that requires a structural engineer, and a building permit.
trying to avoid either risks a disaster.....
just my 2 cent.......
every few years someone working on their home has one collapse..
Plus, unless you're doing something very unusual, why would you need 12 ft steel beams for "rooms and all"? Typically steel is only for special applications that require carrying the higher load than can be achieved with wood in the same space.
There are some standard of beam size and span permitted. You may not need an engineer on a typical structure, but you don't want to skimp at all.
If the span is only 14' why can't you twin the existing beam ...so each bea m holds only one side of the floor load ...I am assuming by hidden beam yo u mean the joists are butted up to the beam... pick the easiest side ... sh ore up the floor joists and cut them short....nail and laminate the new mem bers on to the existing beam ...use joist hangers to reattach joists ...re move temp shoring wall and nuisance post
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