Does a bored pier's reinforcement cage need to be pre-fabricated offsite?

Often, yes — reinforcement cages are commonly pre-assembled to the engineer’s specification, then lowered into the drilled hole as a complete unit, though some can genuinely be assembled on-site depending on size and access.

Either approach achieves the same genuine engineering outcome, so this is a practical construction method decision rather than something that affects the pier’s final quality.

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