Does bored pier diameter affect how deep it needs to go?

Yes, genuinely — diameter and depth work together in your engineer’s design, with a wider diameter pier sometimes able to achieve adequate bearing at a shallower depth than a narrower pier carrying the same load.

This relationship isn’t simple or linear — your engineer balances diameter, depth, and your site’s specific soil profile to arrive at the most appropriate, genuinely load-adequate design, not a fixed formula applied regardless of conditions.

This is exactly the kind of detail confirmed in your engineering documentation — the specific diameter and depth for your piers reflect a genuine calculation, not an estimate.

Related Questions, Guides & Calculators