No recommendations for you but you certainly want to employ somebody that knows what they are doing as this is not a trivial task especially considering that most places that are build on piers are build with specific support points (piers) engineered into the overall substructure of the building. Placing the building on a foundation would most likely need to include some if not all the same support points as the piers it is replacing. Whether that be by installing additional support beams or strategically placed lally columns.
The same considerations also need to be thought about when lifting and supporting the building while a foundation is constructed underneath or risk damaging the building.
Either way it sounds and probably is expensive.
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