A good builder may give sound advice, but he cannot certify the design of the structural intervention. You would be well advised to ask an engineer to comment first, with a view to certifying the design of the work afterwards.
A good builder should offer a cert on work as constructed, stating it complies with the building regulations, etc. You will seldom see sloppy builders putting any bearing pads in hollow block walls, much less taking out hollows and replacing them with solids if the calculations show the point loads are too high.
The removal of a wall can sometimes be straightforward if it is only a space divider and the floor joists run parallel to it and do not rely on it for support. However this is not always the case and if not you will more than likely need to install a beam to support the joists.
The engineer is the building professional best qualified to advise you on structural matters, and he will assess what level of buttressing the wall to be removed currently provides to the walls it abuts at either end, as well as what bearings might be needed for the beam ends.
In addition to the structural compliance, you should consider both cold bridging resulting from the new beam building-in work/support pads and the aesthetic effect of the wall removal. An architect is the building professional best qualified to advise you on these matters.
For maybe ten-fifteen percent extra over you may be able to remove nibs and beams from public view and make it look like the room was always like that. For some people this is a subtle wow factor that repays them every day with a simple elegant solution to their original space problem.
HTH
ONQ.
[broken link removed]