We have a large squeak in our hardwood floor. Its about 3 feet by 3
feet. I contacted the builder and he says there really is nothing he
can do. I said what !! The home is only 3 months old.

I was thinking of bracing the floor joists underneath as the basement
is not finished. Would that help ? Is there anything else that can be
tried to silence a hardwood floor squeak ?

Thanks.