Building Control - requirement of steel columns?

Hi.
I'm having an extension done which measures 7m x 4m.
Originally we were going to have glass atriums in the ceiling, but we've decided not to pursue that now.

A Building Control inspector advised that we need to have steel columns in the end pillars to take the weight, but that's because he was still referring to the old plans where we have the atriums showing.

I'm sure that with a flat roof with no sky lights or atriums, we won't need the extra steel columns. Note that we are having the beam go across at the end.