Primary intent
The keyword-gap packet surfaced ADU cost calculator and ADU calculator as direct buyer-intent phrases. The page answers that intent with a worksheet that separates known inputs from unknown allowances.
Why it matters
A calculator that asks only for square footage is too thin for a modular ADU. Factory package, freight, setting, foundation, utilities, permits, finishes, and contingency need their own lines.
How to use it
Start with the supplier product quote, then add site-specific allowances as they become verified. A blank line should remain visible as a gap, not disappear from the estimate.